Data health

Storm Mode / Tracked area

Illinois

Wall mode

0 warnings total · 0 tornado warnings · 7 alerts including watches and advisories

Current alert feed · checked

Change time or forecast product

Replay uses retained source bytes. Recording begins with activation; missing history is not clear weather.

Live sources keep independent clocks.

Replay coverage and interpretation

Rolling target: 24 hours; cells: six hours. Radar: NOAA MRMS national overview, 8-minute tolerance. Satellite: original GOES GeoColor day/night picture, hourly sampling, 75-minute tolerance. No interpolation or latest-image fallback. Warning and source checks retain their own clocks. “Recorded by” is collector acquisition evidence, not exact browser publication history.

Current GLM density, velocity and specialist layers are hidden during replay. Snow uses retained footprint metadata with unverified pixel time. Forecast uses one pinned issuance/run and exact valid time.

No observed replay frame displayed.

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Warnings in area

7 of 7 alerts
  1. Frost AdvisoryJefferson; Wayne; Edwards; Wabash; Perry; Franklin; Hamilton; White; Jackson; Williamson; Saline; Gallatin; Union; Johnson; Pope; Hardin; Alexander; Pulaski; Massac; Gibson; Pike; Posey; Vanderburgh; Warrick; Spencer; Fulton; Hickman; Carlisle; Ballard; McCracken; Graves; Livingston; Marshall; Calloway; Crittenden; Lyon; Trigg; Caldwell; Union; Webster; Hopkins; Christian; Henderson; Daviess; McLean; Muhlenberg; Todd; Perry; Bollinger; Cape Girardeau; Wayne; Carter; Ripley; Butler; Stoddard; Scott; Mississippi; New MadridNWS Paducah KY · until advisory · radar-alerts checked
  2. Frost AdvisoryMcLean; De Witt; Piatt; Champaign; Vermilion; Christian; Macon; Moultrie; Douglas; Coles; Edgar; Shelby; Cumberland; Clark; Effingham; Jasper; Crawford; Clay; Richland; LawrenceNWS Lincoln IL · until advisory · radar-alerts checked
  3. Frost AdvisoryLogan; SangamonNWS Lincoln IL · until advisory · radar-alerts checked
  4. Frost AdvisoryCarroll; Warren; Tippecanoe; Fountain; Vermillion; Parke; Putnam; Marion; Vigo; Clay; Owen; Morgan; Johnson; Sullivan; Greene; Monroe; Brown; Bartholomew; Knox; Daviess; Martin; Lawrence; Jackson; JenningsNWS Indianapolis IN · until advisory · radar-alerts checked
  5. Frost AdvisoryGreene; Macoupin; Calhoun; Jersey; Pike; Audrain; Osage; Callaway; Montgomery; Lincoln; Gasconade; Warren; St. Charles; St. LouisNWS St Louis MO · until advisory · radar-alerts checked
  6. Frost AdvisoryMontgomery; Bond; Fayette; Clinton; Marion; Washington; Randolph; Madison; St. Clair; Monroe; Franklin; Jefferson; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; ReynoldsNWS St Louis MO · until advisory · radar-alerts checked
  7. Frost AdvisoryKankakee; Livingston; Iroquois; Ford; Eastern Will; Lake; Porter; Newton; Jasper; BentonNWS Chicago IL · until advisory · radar-alerts checked

Watched places

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Layers

Map

  • Frost Advisory 7

NWS’s polygons as issued, or the zones a zone-issued alert names; SPC’s watches by their counties. Checked . Data: NOAA/NWS, NOAA/SPC.

Agency warning geometry · no observed imagery displayed
North ↑

Interactive imagery loads separately. Missing radar does not remove warnings or imply clear weather.

Alert outlines: NOAA/NWS; cell points/observed segments: IEM/NEXRAD. A warning polygon is not a tornado footprint.

Lightning activity — GOES GLM

Total lightning, including in-cloud activity. Not ground-strike locations or a safe-to-go-outside signal.

Cached lightning observations have not loaded. An empty map is not zero lightning.

Cached lightning source details and text readings

Snow analysis — NOHRSC

Source-rendered snow depth and snow water equivalent for the lower 48. History changes this snow picture only; warnings and radar keep their own clocks.

Stored snow depth · footprint valid 2026-10-17 18:00:00 UTC, picture retrieved 2026-10-18 03:23:05.460 UTC.

No NOHRSC picture displayed on the interactive map.

  • 0 - 0.39 in
  • 0.39 - 2.0 in
  • 2.0 - 3.9 in
  • 3.9 - 9.8 in
  • 9.8 - 20 in
  • 20 - 39 in
  • 39 - 59 in
  • 59 - 98 in
  • 98 - 197 in
  • 197 - 295 in
  • 295 - 394 in
  • 394 - 787 in
NOHRSC snow analysis for the lower 48; see the adjacent source legend and time qualification
NOAA/NWS/NOHRSC’s original picture and legend. No station or address value is inferred.

NOHRSC footprint times are metadata; pixel analysis time is not independently verified. Snow-depth pixels have previously differed from the footprint time. This is modeled/assimilated snow analysis, not a measurement at a place. Unshaded and no-data areas do not establish zero snow.

Snow pictures, retained history and source provenance

Radar-derived cells (0) · current

Collector checked ; feed generated . Zero cells does not establish coverage or clear weather. Observations from different radars are not merged.

    Station and river observations (42)

    Surface source current; observed water-level source current. Each reading keeps its own time. Map markers show at most 500 stations and 500 gauges; the complete source directory is paginated.

    Circle: surface station; square: water-level gauge. Filled: current reading and source; hollow: stale, unconfirmed or missing observation. Marker color is not a hazard category. Enable “Stations and gauges” in Layers to inspect them on the map.

    Showing 42 of 42 listed sources. All surface stations and retained trends · All supported gauges and forecasts

    Selected details

    Close

    Surface station KMWA

    current · Observed 2026-10-18 04:35:00 UTC · wind 0 kt · temperature 4 °C.

    Station KMWA · -89.0118, 37.7544 (longitude, latitude).

    Source checked 2026-10-18 04:45:05.982Z · current.

    Station observations, not an address forecast or cyclone maximum wind. Maintenance-flagged, old and implausible reports are excluded by the existing parser; this is not independent NWS quality control.

    Retained observations: 45; target 24 hours, at most 96 reports per station. Recording began 2026-10-17 06:15:07.108Z; oldest available reading 2026-10-17 05:55:00 UTC.

    Observed sustained wind at KMWA (kt)Dots are retained observations. Lines break for missing fields, long intervals or changed station location or units. 0 recorded discontinuities. Dashed lines, when present, are the separately issued NWS forecast.12.1-1.1kt10-17 05:55Z10-18 04:35Z2026-10-17 05:55:00 UTC · 8 kt2026-10-17 06:15:00 UTC · 7 kt2026-10-17 06:35:00 UTC · 9 kt2026-10-17 06:55:00 UTC · 8 kt2026-10-17 07:15:00 UTC · 8 kt2026-10-17 07:35:00 UTC · 6 kt2026-10-17 07:55:00 UTC · 7 kt2026-10-17 08:15:00 UTC · 4 kt2026-10-17 08:35:00 UTC · 5 kt2026-10-17 08:55:00 UTC · 5 kt2026-10-17 09:15:00 UTC · 4 kt2026-10-17 09:35:00 UTC · 5 kt2026-10-17 09:56:00 UTC · 7 kt2026-10-17 10:15:00 UTC · 4 kt2026-10-17 10:35:00 UTC · 3 kt2026-10-17 10:55:00 UTC · 4 kt2026-10-17 11:15:00 UTC · 4 kt2026-10-17 11:35:00 UTC · 3 kt2026-10-17 11:45:00 UTC · 6 kt2026-10-17 12:45:00 UTC · 5 kt2026-10-17 13:45:00 UTC · 10 kt2026-10-17 14:45:00 UTC · 8 kt2026-10-17 15:45:00 UTC · 8 kt2026-10-17 16:45:00 UTC · 11 kt2026-10-17 17:45:00 UTC · 10 kt2026-10-17 18:45:00 UTC · 5 kt2026-10-17 19:45:00 UTC · 8 kt2026-10-17 20:45:00 UTC · 4 kt2026-10-17 21:45:00 UTC · 6 kt2026-10-17 22:45:00 UTC · 6 kt2026-10-17 23:45:00 UTC · 3 kt2026-10-18 00:15:00 UTC · 0 kt2026-10-18 00:35:00 UTC · 0 kt2026-10-18 00:55:00 UTC · 1 kt2026-10-18 01:15:00 UTC · 1 kt2026-10-18 01:35:00 UTC · 1 kt2026-10-18 01:55:00 UTC · 0 kt2026-10-18 02:15:00 UTC · 1 kt2026-10-18 02:35:00 UTC · 0 kt2026-10-18 02:55:00 UTC · 0 kt2026-10-18 03:15:00 UTC · 2 kt2026-10-18 03:35:00 UTC · 0 kt2026-10-18 03:55:00 UTC · 2 kt2026-10-18 04:15:00 UTC · 0 kt2026-10-18 04:35:00 UTC · 0 kt
    Observed sustained wind · 45 retained observations; 0 discontinuities. Lines join reported values only; missing intervals are not interpolated.
    Temperature, dew point and pressure trends
    Observed temperature at KMWA (°C)Dots are retained observations. Lines break for missing fields, long intervals or changed station location or units. 0 recorded discontinuities. Dashed lines, when present, are the separately issued NWS forecast.16.12.9°C10-17 05:55Z10-18 04:35Z2026-10-17 05:55:00 UTC · 11 °C2026-10-17 06:15:00 UTC · 11 °C2026-10-17 06:35:00 UTC · 11 °C2026-10-17 06:55:00 UTC · 10 °C2026-10-17 07:15:00 UTC · 10 °C2026-10-17 07:35:00 UTC · 10 °C2026-10-17 07:55:00 UTC · 10 °C2026-10-17 08:15:00 UTC · 10 °C2026-10-17 08:35:00 UTC · 9 °C2026-10-17 08:55:00 UTC · 9 °C2026-10-17 09:15:00 UTC · 9 °C2026-10-17 09:35:00 UTC · 8 °C2026-10-17 09:56:00 UTC · 8 °C2026-10-17 10:15:00 UTC · 8 °C2026-10-17 10:35:00 UTC · 8 °C2026-10-17 10:55:00 UTC · 8 °C2026-10-17 11:15:00 UTC · 7 °C2026-10-17 11:35:00 UTC · 7 °C2026-10-17 11:45:00 UTC · 6 °C2026-10-17 12:45:00 UTC · 6 °C2026-10-17 13:45:00 UTC · 9 °C2026-10-17 14:45:00 UTC · 10 °C2026-10-17 15:45:00 UTC · 12 °C2026-10-17 16:45:00 UTC · 13 °C2026-10-17 17:45:00 UTC · 14 °C2026-10-17 18:45:00 UTC · 14 °C2026-10-17 19:45:00 UTC · 15 °C2026-10-17 20:45:00 UTC · 15 °C2026-10-17 21:45:00 UTC · 15 °C2026-10-17 22:45:00 UTC · 14 °C2026-10-17 23:45:00 UTC · 11 °C2026-10-18 00:15:00 UTC · 8 °C2026-10-18 00:35:00 UTC · 7 °C2026-10-18 00:55:00 UTC · 7 °C2026-10-18 01:15:00 UTC · 6 °C2026-10-18 01:35:00 UTC · 6 °C2026-10-18 01:55:00 UTC · 6 °C2026-10-18 02:15:00 UTC · 5 °C2026-10-18 02:35:00 UTC · 6 °C2026-10-18 02:55:00 UTC · 5 °C2026-10-18 03:15:00 UTC · 5 °C2026-10-18 03:35:00 UTC · 5 °C2026-10-18 03:55:00 UTC · 5 °C2026-10-18 04:15:00 UTC · 5 °C2026-10-18 04:35:00 UTC · 4 °C
    Observed temperature · 45 retained observations; 0 discontinuities. Lines join reported values only; missing intervals are not interpolated.
    Observed dew point at KMWA (°C)Dots are retained observations. Lines break for missing fields, long intervals or changed station location or units. 0 recorded discontinuities. Dashed lines, when present, are the separately issued NWS forecast.80°C10-17 05:55Z10-18 04:35Z2026-10-17 05:55:00 UTC · 7 °C2026-10-17 06:15:00 UTC · 7 °C2026-10-17 06:35:00 UTC · 6 °C2026-10-17 06:55:00 UTC · 6 °C2026-10-17 07:15:00 UTC · 6 °C2026-10-17 07:35:00 UTC · 6 °C2026-10-17 07:55:00 UTC · 6 °C2026-10-17 08:15:00 UTC · 6 °C2026-10-17 08:35:00 UTC · 6 °C2026-10-17 08:55:00 UTC · 6 °C2026-10-17 09:15:00 UTC · 6 °C2026-10-17 09:35:00 UTC · 6 °C2026-10-17 09:56:00 UTC · 5 °C2026-10-17 10:15:00 UTC · 5 °C2026-10-17 10:35:00 UTC · 5 °C2026-10-17 10:55:00 UTC · 5 °C2026-10-17 11:15:00 UTC · 5 °C2026-10-17 11:35:00 UTC · 6 °C2026-10-17 11:45:00 UTC · 5 °C2026-10-17 12:45:00 UTC · 4 °C2026-10-17 13:45:00 UTC · 5 °C2026-10-17 14:45:00 UTC · 5 °C2026-10-17 15:45:00 UTC · 4 °C2026-10-17 16:45:00 UTC · 4 °C2026-10-17 17:45:00 UTC · 2 °C2026-10-17 18:45:00 UTC · 2 °C2026-10-17 19:45:00 UTC · 2 °C2026-10-17 20:45:00 UTC · 2 °C2026-10-17 21:45:00 UTC · 1 °C2026-10-17 22:45:00 UTC · 1 °C2026-10-17 23:45:00 UTC · 1 °C2026-10-18 00:15:00 UTC · 4 °C2026-10-18 00:35:00 UTC · 3 °C2026-10-18 00:55:00 UTC · 3 °C2026-10-18 01:15:00 UTC · 4 °C2026-10-18 01:35:00 UTC · 5 °C2026-10-18 01:55:00 UTC · 6 °C2026-10-18 02:15:00 UTC · 4 °C2026-10-18 02:35:00 UTC · 5 °C2026-10-18 02:55:00 UTC · 5 °C2026-10-18 03:15:00 UTC · 5 °C2026-10-18 03:35:00 UTC · 4 °C2026-10-18 03:55:00 UTC · 3 °C2026-10-18 04:15:00 UTC · 3 °C2026-10-18 04:35:00 UTC · 3 °C
    Observed dew point · 45 retained observations; 0 discontinuities. Lines join reported values only; missing intervals are not interpolated.

    Observed sea-level pressure: no readable observations.

    Observed reports as a table (45)
    Observed (UTC)Wind / gust (kt)From (° true)Temperature / dew point (°C)Pressure (mb)Visibility (mi)
    2026-10-17 05:55:00 UTC8 / Not reported35011 / 7Not reported10 or more
    2026-10-17 06:15:00 UTC7 / Not reported34011 / 7Not reported10 or more
    2026-10-17 06:35:00 UTC9 / Not reported36011 / 6Not reported10 or more
    2026-10-17 06:55:00 UTC8 / Not reported1010 / 6Not reported10 or more
    2026-10-17 07:15:00 UTC8 / Not reported36010 / 6Not reported10 or more
    2026-10-17 07:35:00 UTC6 / Not reported36010 / 6Not reported10 or more
    2026-10-17 07:55:00 UTC7 / Not reported36010 / 6Not reported10 or more
    2026-10-17 08:15:00 UTC4 / Not reported35010 / 6Not reported10 or more
    2026-10-17 08:35:00 UTC5 / Not reportedVariable9 / 6Not reported10 or more
    2026-10-17 08:55:00 UTC5 / Not reported3609 / 6Not reported10 or more
    2026-10-17 09:15:00 UTC4 / Not reported3609 / 6Not reported10 or more
    2026-10-17 09:35:00 UTC5 / Not reported3608 / 6Not reported10 or more
    2026-10-17 09:56:00 UTC7 / Not reported108 / 5Not reported10 or more
    2026-10-17 10:15:00 UTC4 / Not reported3608 / 5Not reported10 or more
    2026-10-17 10:35:00 UTC3 / Not reported3408 / 5Not reported10 or more
    2026-10-17 10:55:00 UTC4 / Not reported3608 / 5Not reported10 or more
    2026-10-17 11:15:00 UTC4 / Not reported3507 / 5Not reported10 or more
    2026-10-17 11:35:00 UTC3 / Not reported3507 / 6Not reported10 or more
    2026-10-17 11:45:00 UTC6 / Not reported206 / 5Not reported10 or more
    2026-10-17 12:45:00 UTC5 / Not reported3606 / 4Not reported10 or more
    2026-10-17 13:45:00 UTC10 / Not reported209 / 5Not reported10 or more
    2026-10-17 14:45:00 UTC8 / Not reported4010 / 5Not reported10 or more
    2026-10-17 15:45:00 UTC8 / Not reported2012 / 4Not reported10 or more
    2026-10-17 16:45:00 UTC11 / 16 2013 / 4Not reported10 or more
    2026-10-17 17:45:00 UTC10 / 16 2014 / 2Not reported10 or more
    2026-10-17 18:45:00 UTC5 / 14 3014 / 2Not reported10 or more
    2026-10-17 19:45:00 UTC8 / Not reported34015 / 2Not reported10 or more
    2026-10-17 20:45:00 UTC4 / Not reported1015 / 2Not reported10 or more
    2026-10-17 21:45:00 UTC6 / Not reported36015 / 1Not reported10 or more
    2026-10-17 22:45:00 UTC6 / Not reported2014 / 1Not reported10 or more
    2026-10-17 23:45:00 UTC3 / Not reported4011 / 1Not reported10 or more
    2026-10-18 00:15:00 UTC0 / Not reportedCalm8 / 4Not reported10 or more
    2026-10-18 00:35:00 UTC0 / Not reportedCalm7 / 3Not reported10 or more
    2026-10-18 00:55:00 UTC1 / Not reported707 / 3Not reported10 or more
    2026-10-18 01:15:00 UTC1 / Not reported306 / 4Not reported10 or more
    2026-10-18 01:35:00 UTC1 / Not reported406 / 5Not reported10 or more
    2026-10-18 01:55:00 UTC0 / Not reportedCalm6 / 6Not reported10 or more
    2026-10-18 02:15:00 UTC1 / Not reported205 / 4Not reported10 or more
    2026-10-18 02:35:00 UTC0 / Not reportedCalm6 / 5Not reported10 or more
    2026-10-18 02:55:00 UTC0 / Not reportedCalm5 / 5Not reported10 or more
    2026-10-18 03:15:00 UTC2 / Not reported205 / 5Not reported10 or more
    2026-10-18 03:35:00 UTC0 / Not reportedCalm5 / 4Not reported10 or more
    2026-10-18 03:55:00 UTC2 / Not reported2205 / 3Not reported10 or more
    2026-10-18 04:15:00 UTC0 / Not reportedCalm5 / 3Not reported10 or more
    2026-10-18 04:35:00 UTC0 / Not reportedCalm4 / 3Not reported10 or more
    Capture times, quality and provenance

    Each report keeps its observation time, first capture of this version, and the SHA-256 of the source bulk body. Corrections at the same observation time replace that point and are marked; unrelated bulk-file changes do not freshen a report.

    • Observed 2026-10-17 05:55:00 UTC, captured 2026-10-17 06:15:07.108Z; source body SHA-256 bc11437b0ef17dcf4b91f1dd747598a8f12e615b799dd81a79f1255842a6924c.
    • Observed 2026-10-17 06:15:00 UTC, captured 2026-10-17 06:30:05.861Z; source body SHA-256 d2367d9768b90c597493305ffa360f940ef03b7106f33dd081f52a3184a99a76.
    • Observed 2026-10-17 06:35:00 UTC, captured 2026-10-17 06:45:06.740Z; source body SHA-256 9c6f5a3106002efdcc7a8b2d0e8218089792e9eef38cd8299c5bd836e5d42087.
    • Observed 2026-10-17 06:55:00 UTC, captured 2026-10-17 07:15:08.103Z; source body SHA-256 bb6a8a40e3bed4e1a6d2b0819f1d14e96e53cbfc2f45540efd8023f74290ea00.
    • Observed 2026-10-17 07:15:00 UTC, captured 2026-10-17 07:30:07.049Z; source body SHA-256 72518a7cc84febeb6a5215ea486f40da6a7f9fd82c469215c981994a032b8dde.
    • Observed 2026-10-17 07:35:00 UTC, captured 2026-10-17 07:45:06.824Z; source body SHA-256 969c77d7b2b2764c9f773a87041c6cbbbbaf8823bfa35f91b4140429ac51bb7a.
    • Observed 2026-10-17 07:55:00 UTC, captured 2026-10-17 08:15:10.499Z; source body SHA-256 a39722f704ee162691aaecdd40de5ce5fee94d2d7f6291ad35f498846325d650.
    • Observed 2026-10-17 08:15:00 UTC, captured 2026-10-17 08:30:06.317Z; source body SHA-256 ee57d94d765305bdee2e9324b9ec29aed1dcaefe34d7679035bd31c26621fb73.
    • Observed 2026-10-17 08:35:00 UTC, captured 2026-10-17 08:45:06.623Z; source body SHA-256 a3e5257dcf1bc3618e16cbe3b34c3744fe8e49bdd3fafa0fbdc0e4b1a5568c20.
    • Observed 2026-10-17 08:55:00 UTC, captured 2026-10-17 09:15:07.673Z; source body SHA-256 016271d991e052b4ca0bb6a0412411402fcafc0acde04052dffa85b284d7e986.
    • Observed 2026-10-17 09:15:00 UTC, captured 2026-10-17 09:30:07.003Z; source body SHA-256 ce16615c7ffb7c9225122ce0061b3c973daddab7d943d3cec70767f99ed3598c.
    • Observed 2026-10-17 09:35:00 UTC, captured 2026-10-17 09:45:06.572Z; source body SHA-256 264ee016d2ae83ee5e7131cea90c67d6f9bde3f9890fbab2f70dc771a0f7992e.
    • Observed 2026-10-17 09:56:00 UTC, captured 2026-10-17 10:15:07.619Z; source body SHA-256 efa29a4c0d0a7e81934e340e5f363562848208a428e561ca8ffb8afe4fee1d5d.
    • Observed 2026-10-17 10:15:00 UTC, captured 2026-10-17 10:30:06.352Z; source body SHA-256 87ae8c0134ee4bb56b82c46d1fd6b1969bd7b7a47f3d1c0e425824aacaac3811.
    • Observed 2026-10-17 10:35:00 UTC, captured 2026-10-17 10:45:06.782Z; source body SHA-256 9ace5290d29da96dc29ba5a5c7f02d2d81d32c81c0102054dbad890e49bbf8a8.
    • Observed 2026-10-17 10:55:00 UTC, captured 2026-10-17 11:15:07.064Z; source body SHA-256 7b8de7613178a73bdf0132bc79f470b3cc468514bec5c0458f7c710d68cffae8.
    • Observed 2026-10-17 11:15:00 UTC, captured 2026-10-17 11:30:05.719Z; source body SHA-256 c9c795d31eeffa7e41e76acece367fd4abc33772ba088c0bf8588ed8d9b403e5.
    • Observed 2026-10-17 11:35:00 UTC, captured 2026-10-17 11:45:06.616Z; source body SHA-256 f7c801856f99557ed285ea2d3242c989100b943f230dadff0df38c8a48f1969e.
    • Observed 2026-10-17 11:45:00 UTC, captured 2026-10-17 12:00:07.101Z; source body SHA-256 0d48ce09e98a50d784e5ad8e140491c989145805c5bb2e2374c623945ce9d22d.
    • Observed 2026-10-17 12:45:00 UTC, captured 2026-10-17 13:00:09.198Z; source body SHA-256 aa321e5db523e4ae79b5eb84e3edd54688a5b7f83f8b9534cd752d4abe9a07e1.
    • Observed 2026-10-17 13:45:00 UTC, captured 2026-10-17 14:00:06.148Z; source body SHA-256 eddc6593eb288cbf6f6e163ab9b2a8e2d83da18452c1b5ac1e3855ebb2db91be.
    • Observed 2026-10-17 14:45:00 UTC, captured 2026-10-17 15:00:06.490Z; source body SHA-256 fd6f39df63ed66d82a0d722d3ba639a811bb9e87f6416735ea4ec817c4b69f7b.
    • Observed 2026-10-17 15:45:00 UTC, captured 2026-10-17 16:00:07.184Z; source body SHA-256 011c3be17b8bb37fe5f6ec9648267ed81c7e9853e6a8b98b8ad0bb065dff5968.
    • Observed 2026-10-17 16:45:00 UTC, captured 2026-10-17 17:00:06.696Z; source body SHA-256 b8be3a3f9dbb0f9d47f7f7d56c511352303f71121022093aee1718b59882e480.
    • Observed 2026-10-17 17:45:00 UTC, captured 2026-10-17 18:00:07.907Z; source body SHA-256 87f841dd0eda299799ecfa27669c14712906e9b7f2462af1e9aaebc60f5a4644.
    • Observed 2026-10-17 18:45:00 UTC, captured 2026-10-17 19:00:06.492Z; source body SHA-256 9b92790a99ac0e8c2777442829b2a9236f72d6e831b8d9a0836ca29a9d3acbba.
    • Observed 2026-10-17 19:45:00 UTC, captured 2026-10-17 20:00:08.337Z; source body SHA-256 b75985c438912b2da4a26e309fc2fbabef235be8a13c5848c5c5d64297850019.
    • Observed 2026-10-17 20:45:00 UTC, captured 2026-10-17 21:00:07.279Z; source body SHA-256 79c0cc8ae6d502baffa56263b2daf4c86fd1628f11d5a529402c527d0ff32fe1.
    • Observed 2026-10-17 21:45:00 UTC, captured 2026-10-17 22:00:07.362Z; source body SHA-256 f1fa85855e007d5d5b85e6dbf4575f6d6bfe58fd5c9a7bb6d9e9cc636ec4c3b2.
    • Observed 2026-10-17 22:45:00 UTC, captured 2026-10-17 23:00:07.092Z; source body SHA-256 2ee1214ad66de98865565d92f21f7f5094d6b2e4ef4f09839341a5e6cd89b61b.
    • Observed 2026-10-17 23:45:00 UTC, captured 2026-10-18 00:00:09.347Z; source body SHA-256 fe50c177f37463edb2970e7df309ca8243c740fe7f3ba6344704878ab6922ee2.
    • Observed 2026-10-18 00:15:00 UTC, captured 2026-10-18 00:30:06.852Z; source body SHA-256 8e3fb2d104d62ee584c29d18a0e33a08276c0c1b45eec979cb7f087bdef2f712.
    • Observed 2026-10-18 00:35:00 UTC, captured 2026-10-18 00:45:10.479Z; source body SHA-256 b34d5cb7d1e91893d539f82e3b7c1bcb0803285010e7b33858b258866d0d8a86.
    • Observed 2026-10-18 00:55:00 UTC, captured 2026-10-18 01:15:11.480Z; source body SHA-256 4e03e4713df8355508ff6e003de099fa794d8905f60515988527c0359147ddbe.
    • Observed 2026-10-18 01:15:00 UTC, captured 2026-10-18 01:30:08.633Z; source body SHA-256 848e769c04c496475a4a56da164c43dc2da3091dec76864a121c5df6639d5e1a.
    • Observed 2026-10-18 01:35:00 UTC, captured 2026-10-18 01:45:08.112Z; source body SHA-256 13cad0e15a9b698bf0b792427bc82dd8fc2190754fc0585e8c712116a178328a.
    • Observed 2026-10-18 01:55:00 UTC, captured 2026-10-18 02:15:09.964Z; source body SHA-256 96d6803b8c6f76d1b7153a523f8f2c76dd3341c87fa0d79a41eada37a566a9a0.
    • Observed 2026-10-18 02:15:00 UTC, captured 2026-10-18 02:30:10.380Z; source body SHA-256 15a6245beadfd0a8ce6f77aaf2ff42b204b4a2e411aaa89ef6925de72a6b13f9.
    • Observed 2026-10-18 02:35:00 UTC, captured 2026-10-18 02:45:10.655Z; source body SHA-256 f7c5501ef4bfeeb31f4ebf98fffb35a41d8f1ea4c93568cacb717917c0a2b2c2.
    • Observed 2026-10-18 02:55:00 UTC, captured 2026-10-18 03:15:10.023Z; source body SHA-256 286048f59de6ba9e40cefa7baf3b30600d840a609330ffdd3c5421c3e015acde.
    • Observed 2026-10-18 03:15:00 UTC, captured 2026-10-18 03:30:08.591Z; source body SHA-256 5672bdaa00d8e7c67de8856281c396b4883e06cda834c224faa3a626ff6d1bf9.
    • Observed 2026-10-18 03:35:00 UTC, captured 2026-10-18 03:45:09.489Z; source body SHA-256 ff30b281581e6086665a9b0170982c399149dc2307f678d1c04532064fc0aa5d.
    • Observed 2026-10-18 03:55:00 UTC, captured 2026-10-18 04:15:10.808Z; source body SHA-256 3208f6bb3bd857b2dec6e5a4113a661211834775509581ca2d816ebbf9290282.
    • Observed 2026-10-18 04:15:00 UTC, captured 2026-10-18 04:30:08.115Z; source body SHA-256 b945d1dd8082b8fdac9fb06097591ce9e84170b10dcdd2e4fdd962f2b9d6fbb7.
    • Observed 2026-10-18 04:35:00 UTC, captured 2026-10-18 04:45:08.397Z; source body SHA-256 1981ebf0c9644e8e79c2b29009ee99216868277aa873dc9b808b83c662479d81.

    Values use the decoded station report. Null means not reported, never zero. Gust is kept separate from sustained wind.

    Observation source page · Cached readings as JSON · Official source

    Recent source changes

    Recording coverage and limits
    • warnings: retained from 2026-10-17T04:56:40.540Z through 2026-10-18T04:56:04.893Z
    • outlooks: retained from 2026-10-17T04:56:40.540Z through 2026-10-18T04:55:07.065Z
    • hydro: retained from 2026-10-17T04:56:40.540Z through 2026-10-18T04:55:05.918Z
    • analysis: retained from 2026-10-17T04:56:40.540Z through 2026-10-18T04:45:08.397Z
    • winter: retained from 2026-10-17T04:56:40.540Z through 2026-10-18T04:53:05.076Z

    Source-message history is not recorded imagery replay. Recorded radar/satellite imagery is not available in this view.

    Auto-updating checks this site’s cache every minute; each source keeps its own clock.

    SPC preliminary storm reports

    0 matching reports · 0 in this monitoring area

    Source current · checked 2026-10-18T04:55:05.737Z. Convective day: 2026-10-17T12:00:00.000Z to 2026-10-18T12:00:00.000Z (12–12 UTC). Reports are filtered to the monitoring geography.

    All reports are preliminary. Counts are reports, not unique storms or confirmed tornadoes. Measured versus estimated values and observer identity are not separate fields in the SPC file; the original comment is preserved. Warning polygons and radar-cell detections are separate evidence.

    No readable reports match this scope and type in this cached convective-day file. Missing reports do not establish safe conditions.

    Spotlight: Winter Storm Severity Index

    1 of 15

    Winter Storm Severity Index

    WPC: “WSSI does not depict official warnings and should always be used in context with official NWS forecasts and warnings.”

    • Winter Weather Area
    • Minor Impacts
    • Moderate Impacts
    • Major Impacts
    • Extreme Impacts

    Highest in this area, by day and by cause

    Day 1
    nothing drawn
    Day 2
    nothing drawn
    Day 3
    nothing drawn
    Snow amount, Days 1–3
    nothing drawn
    Snow load, Days 1–3
    nothing drawn
    Ice, Days 1–3
    nothing drawn
    Blowing snow, Days 1–3
    nothing drawn

    Each day and cause on the Winter tab, with its own issue time

    WPC’s WSSI, overall impact, Days 1–3, valid to , issued . WPC issues each day and cause on its own clock. Not a warning, and not a chance. Data: NOAA/NWS/WPC.

    Chance of Moderate impacts or worse, Day 1

    WPC: “WSSI does not depict official warnings and should always be used in context with official NWS forecasts and warnings.”

    • 5–10%
    • 10–20%
    • 20–30%
    • 30–40%
    • 40–50%
    • 50–60%
    • 60–70%
    • 70–80%
    • 80–90%
    • 90–95%
    • 95% or more

    Each level and day on the Winter tab

    WPC’s WSSI-P: no chance drawn for Day 1. Data: NOAA/NWS/WPC.

    Chance of at least 4 inches of snow, Day 1

    WPC gives no chance of 4 inches of snow or more in this area over the next three days, so Day 1’s 4 inches is shown.

    • Slight: at least 10%
    • Moderate: at least 40%
    • High: at least 70%

    Every day and amount on the Winter tab

    WPC’s Probabilistic Winter Precipitation Forecast, to , issued . Outlines, as WPC draws them. Data: NOAA/NWS/WPC.

    Winter watches, warnings and advisories

    • Frost Advisory 7 7 not yet in effect · until · NWS Chicago IL, NWS Indianapolis IN, NWS Lincoln IL, 2 more offices

    NWS’s winter and cold alerts in force in the area, by event as issued, each counted once, with the offices that issued them and the latest end. Data: NOAA/NWS.

    Snow on the ground

    NOHRSC snow depth and snow water equivalent use the source’s original pictures and legends, with qualified footprint times. Open the cached source page for availability and retained history. This wall has no snow picture to rotate; missing imagery does not mean no snow.

    NOHRSC snow analysis and retained pictures

    Data: NOAA/NWS/NOHRSC. Snow analysis, not a measurement at a place.

    WPC’s heavy snow and icing discussion

    The whole discussion

    Issued , for to . WPC’s words, as written. Data: NOAA/NWS/WPC.

    SPC Day 1 outlook

    • General Thunderstorms Risk

    SPC’s Day 1 categorical outlook, valid to , issued . SPC’s categories, as drawn. Data: NOAA/SPC.

    Watches

    No tornado or severe thunderstorm watch in force in this area.

    SPC’s watches, by number, matched by the counties they list. Data: NOAA/SPC.

    Mesoscale discussions

    No mesoscale discussion reaches this area.

    SPC’s mesoscale discussions whose outline reaches the area. Data: NOAA/SPC.

    Storm ingredients

    SPC’s hourly mesoanalysis, observed soundings and model guidance for the area, on the Analysis tab with its own clocks.

    Open the Analysis tab

    Drawn by the Analysis tab’s own renderer. Data: NOAA/SPC, NOAA/NCEP.

    Flash-flood risk, Day 1

    • Marginal
    • Slight

    WPC’s excessive rainfall outlook, to , issued : a chance of flash flooding, in four categories. Data: NOAA/WPC.

    River gauges in flood

    No river, coastal or lake gauge in this area is in flood, observed or forecast.

    NWS’s gauges at flood stage or above in the area, worst first, each with its forecast hydrograph on Rain & rivers. Data: NOAA/NWPS.

    Rain expected and rain that fell

    WPC’s rain forecast and MRMS’s radar estimate of the rain that fell, on the Briefing’s map for the area.

    Open Rain & rivers

    Data: NOAA/WPC, NOAA/NSSL MRMS.

    The tropics

    NHC’s and JTWC’s storms, their official graphics and the watches and warnings for them. Storm Mode’s own tropical panels arrive with its tropical events.

    Open the Tropics page

    Data: NOAA/NHC, JTWC.

    Radar, winter preset

    The Radar page’s winter preset over the area: HRDPS forecast snow with NWS’s warnings on top, loaded by your browser. A forecast, labelled as one there.

    Open the radar

    Live tiles; the radar keeps no last-good copy.

    What changed, last 60 minutes

    since , when this server began watching this area

    Nothing has changed since 04:21Z.

    The products’ own words and times, and what is no longer in force since the last read. Never written by AI.

    Monitoring area, legacy alert summary and selection rules
    Area
    Illinois (NWS states: IL)
    Hazards
    Every kind of warning, watch and advisory this site carries
    Window
    In force now, with the next days of SPC’s and WPC’s products
    Made by
    This address: anyone can make one, and nothing is stored. Change the area or hazards

    An area you chose, not a storm’s footprint: everything here is in force in this area, never “from this storm”.

    In force in this area 7

    1. Frost Advisory71 new · 7 not yet in effect · until 14:00Z
    Every alert in this area, most urgent first
    1. Frost AdvisoryJefferson; Wayne; Edwards; Wabash; Perry; Franklin; Hamilton; White; Jackson; Williamson; Saline; Gallatin; Union; Johnson; Pope; Hardin; Alexander; Pulaski; Massac; Gibson; Pike; Posey; Vanderburgh; Warrick; Spencer; Fulton; Hickman; Carlisle; Ballard; McCracken; Graves; Livingston; Marshall; Calloway; Crittenden; Lyon; Trigg; Caldwell; Union; Webster; Hopkins; Christian; Henderson; Daviess; McLean; Muhlenberg; Todd; Perry; Bollinger; Cape Girardeau; Wayne; Carter; Ripley; Butler; Stoddard; Scott; Mississippi; New MadridFrom · until · NWS Paducah KY
    2. Frost AdvisoryMcLean; De Witt; Piatt; Champaign; Vermilion; Christian; Macon; Moultrie; Douglas; Coles; Edgar; Shelby; Cumberland; Clark; Effingham; Jasper; Crawford; Clay; Richland; LawrenceFrom · until · NWS Lincoln IL
    3. Frost AdvisoryLogan; SangamonFrom · until · NWS Lincoln IL
    4. Frost AdvisoryCarroll; Warren; Tippecanoe; Fountain; Vermillion; Parke; Putnam; Marion; Vigo; Clay; Owen; Morgan; Johnson; Sullivan; Greene; Monroe; Brown; Bartholomew; Knox; Daviess; Martin; Lawrence; Jackson; JenningsFrom · until · NWS Indianapolis IN · drawn over this area
    5. Frost AdvisoryGreene; Macoupin; Calhoun; Jersey; Pike; Audrain; Osage; Callaway; Montgomery; Lincoln; Gasconade; Warren; St. Charles; St. LouisFrom · until · NWS St Louis MO
    6. Frost AdvisoryMontgomery; Bond; Fayette; Clinton; Marion; Washington; Randolph; Madison; St. Clair; Monroe; Franklin; Jefferson; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; ReynoldsFrom · until · NWS St Louis MO
    7. Frost AdvisoryKankakee; Livingston; Iroquois; Ford; Eastern Will; Lake; Porter; Newton; Jasper; BentonFrom · until · NWS Chicago IL

    Most urgent first, by the Briefing’s ranking. Checked .

    Sources

    Choose another storm or areaChange monitoring areaSource status

    Not an official warning service. Warnings and watches are the National Weather Service’s, outlooks and reports the Storm Prediction Center’s and the Weather Prediction Center’s (Data: NOAA/NWS, NOAA/SPC, NOAA/WPC). When a warning is issued for you, act on it, and use weather.gov or a NOAA Weather Radio for where you are.