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.

Open the complete replay reader (works without scripting or WebGL)

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 2026-10-18 00:00:00 UTC, picture retrieved 2026-10-18 06:23:06.237 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

    Kankakee; Livingston; Iroquois; Ford; Eastern Will; Lake; Porter; Newton; Jasper; Benton

    Frost Advisory · Current published alert

    Frost Advisory issued October 17 at 11:38PM CDT until October 18 at 8:00AM CDT by NWS Chicago IL

    Issued · ends

    Official source ↗

    Official geographic context; not a storm footprint.

    Recent source changes

    Recording coverage and limits
    • warnings: retained from 2026-10-17T06:24:15.818Z through 2026-10-18T06:24:03.987Z
    • outlooks: retained from 2026-10-17T06:24:15.818Z through 2026-10-18T06:20:05.922Z
    • hydro: retained from 2026-10-17T06:24:15.818Z through 2026-10-18T06:15:08.267Z
    • analysis: retained from 2026-10-17T06:24:15.818Z through 2026-10-18T06:15:09.754Z
    • winter: retained from 2026-10-17T06:24:15.818Z through 2026-10-18T06:23:05.341Z

    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.

    Analysis and model context

    Current cached context, independently dated. Regional reference: IL; a reference within a wider monitoring area does not replace the complete warning geography. This section remains separate from the historical replay cursor and official cyclone forecast. Use Forecast to pin a retained model package.

    Surface: what stations observe and WPC analyses

    H1033443538373937393539383938423643343934413444344626423343374040453638344038373542364235423343313737453543384530403843343746323935393940354033433443324134383736354137393240344030443341324137414139384536383746323732433241324034413639394134373438364530393748334236373537374135353142334436363536363632404041404033424039374438373345324436383644344130
    Illinois: one station shown in each small area of the map, so it stays legible; the table lists every station in a state.

    On the map

    • Observed temperature, °F, above-left of the station
    • Observed dew point, °F, below-left
    • Observed temperature and dew point are left off the map on a screen this narrow: the table below lists every station’s.
    • Observed wind: the staff points to where it blows from; a full barb is 10 kt, a half 5, a pennant 50; a ring is calm
    • Analysis cold front
    • Analysis warm front
    • Analysis stationary front
    • Analysis occluded front
    • Analysis dry line
    • Analysis trough
    • Analysis high and low pressure centres, with their pressure in millibars

    WPC’s bulletin does not say which side of a front its symbols go, so this map draws no triangles or half-circles; each front is named on the map and in the list.

    Observed 2,073 stations, each at its own time, most between and . Airport and other automated stations’ reports (METARs), as AviationWeather.gov decodes them. Left out: 586 reports flagged by the station for maintenance and no reports that cannot be right; no other quality control is applied here.

    Analysis WPC’s surface analysis valid , issued . A forecaster’s analysis of the fronts and pressure centres at that hour, every three hours.

    WPC analyses no front across Illinois; troughs are drawn on the map.

    Every station in Illinois (42)
    42 stations in Illinois, by identifier
    StationObservedTemperatureDew pointWindPressureVisibilityWeather
    K06C44 °F35 °F200° 6 kt—10+ mi—
    K1H238 °F37 °Fcalm—10+ mi—
    K3LF39 °F35 °Fcalm—10+ mi—
    KAJG39 °F38 °Fcalm—10+ mi—
    KALN39 °F38 °Fcalm—10+ mi—
    KARR42 °F36 °F200° 5 kt1030.6 mb10+ mi—
    KBMI39 °F34 °F190° 5 kt1031.7 mb10+ mi—
    KC7542 °F33 °F160° 4 kt—10+ mi—
    KCIR40 °F40 °Fcalm—10+ mi—
    KDEC37 °F35 °Fcalm1032.3 mb10+ mi—
    KDKB42 °F36 °F200° 8 kt—10+ mi—
    KDPA42 °F35 °F200° 5 kt1030.9 mb10+ mi—
    KENL37 °F37 °Fcalm—1.75 miBR
    KFEP43 °F34 °F200° 10 kt—10+ mi—
    KFOA37 °F—calm—10+ mi—
    KFWC39 °F35 °Fcalm—10+ mi—
    KGBG40 °F35 °F170° 4 kt—10+ mi—
    KHSB38 °F37 °Fcalm—5 miBR
    KI6339 °F32 °Fcalm—10+ mi—
    KIJX40 °F34 °F150° 5 kt—10+ mi—
    KIKK40 °F30 °F200° 3 kt—10+ mi—
    KJOT42 °F38 °Fcalm—10+ mi—
    KLOT41 °F37 °F180° 7 kt—10+ mi—
    KM3039 °F38 °Fcalm—10+ mi—
    KMDH38 °F37 °Fcalm1032.1 mb10+ mi—
    KMDW46 °F32 °F200° 7 kt1030.9 mb10+ mi—
    KMLI43 °F32 °F200° 8 kt1029.7 mb10+ mi—
    KMQB40 °F34 °F170° 4 kt—10+ mi—
    KMWA39 °F39 °F240° 1 kt—10+ mi—
    KOLY38 °F36 °Fcalm—10+ mi—
    KPIA42 °F36 °Fcalm1031.2 mb10+ mi—
    KPNT37 °F35 °F150° 5 kt—10+ mi—
    KPPQ41 °F35 °F180° 3 kt—10+ mi—
    KPRG35 °F31 °Fcalm—10+ mi—
    KRPJ36 °F35 °F190° 6 kt—10+ mi—
    KRSV36 °F36 °F100° 1 kt—10+ mi—
    KSAR40 °F40 °Fcalm—10+ mi—
    KSFY40 °F33 °F150° 6 kt—10+ mi—
    KSLO42 °F40 °Fnot given—10+ mi—
    KSPI39 °F37 °F140° 3 kt1031.7 mb10+ mi—
    KTIP37 °F33 °Fcalm—10+ mi—
    KUGN44 °F36 °F210° 8 kt1029.3 mb10+ mi—

    Surface observations checked · Data: NOAA/NWS Aviation Weather Center

    WPC surface analysis checked · Data: NOAA/WPC

    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 1 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
    1. SPC Day 1 outlook issued

    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 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 Madriduntil · 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; Lawrenceuntil · NWS Lincoln IL
    3. Frost AdvisoryLogan; Sangamonuntil · 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; Jenningsuntil · NWS Indianapolis IN · drawn over this area
    5. Frost AdvisoryGreene; Macoupin; Calhoun; Jersey; Pike; Audrain; Osage; Callaway; Montgomery; Lincoln; Gasconade; Warren; St. Charles; St. Louisuntil · 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; Reynoldsuntil · 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.