Data health

Storm Mode / Tracked area

Severe storms: California

Wall mode

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

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Warnings in area

0 of 0 alerts

No active alerts reported by the current feed in this monitoring area.

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Layers

Map

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
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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 09:00:00 UTC, picture retrieved 2026-10-18 17:08:06.654 UTC.

No NOHRSC picture displayed on the interactive map.

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  • 20 - 39 in
  • 39 - 59 in
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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

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)
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 (103)

    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 100 of 103 listed sources. All surface stations and retained trends · All supported gauges and forecasts

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    Surface station KFCH

    current · Observed 2026-10-18 16:55:00 UTC · wind 7 kt · temperature 25 °C.

    Station KFCH · -119.8204, 36.7338 (longitude, latitude).

    Source checked 2026-10-18 17:15:05.763Z · 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: 27; target 24 hours, at most 96 reports per station. Recording began 2026-10-17 06:15:07.108Z; oldest available reading 2026-10-17 17:35:00 UTC.

    Observed sustained wind at KFCH (kt)Dots are retained observations. Lines break for missing fields, long intervals or changed station location or units. 1 recorded discontinuities. Dashed lines, when present, are the separately issued NWS forecast.8-1kt10-17 17:35Z10-18 16:55Z2026-10-17 17:35:00 UTC · 0 kt2026-10-17 17:55:00 UTC · 0 kt2026-10-17 18:15:00 UTC · 0 kt2026-10-17 18:35:00 UTC · 0 kt2026-10-17 18:55:00 UTC · 0 kt2026-10-17 19:15:00 UTC · 4 kt2026-10-17 19:35:00 UTC · 3 kt2026-10-17 19:55:00 UTC · 0 kt2026-10-17 20:15:00 UTC · 4 kt2026-10-17 20:35:00 UTC · 6 kt2026-10-17 20:55:00 UTC · 5 kt2026-10-17 21:15:00 UTC · 4 kt2026-10-17 21:35:00 UTC · 6 kt2026-10-17 21:55:00 UTC · 5 kt2026-10-17 22:15:00 UTC · 5 kt2026-10-17 22:35:00 UTC · 4 kt2026-10-17 22:55:00 UTC · 4 kt2026-10-17 23:15:00 UTC · 0 kt2026-10-17 23:35:00 UTC · 0 kt2026-10-17 23:55:00 UTC · 0 kt2026-10-18 00:15:00 UTC · 0 kt2026-10-18 00:55:00 UTC · 0 kt2026-10-18 01:15:00 UTC · 0 kt2026-10-18 01:30:00 UTC · 0 kt2026-10-18 16:15:00 UTC · 7 kt2026-10-18 16:35:00 UTC · 6 kt2026-10-18 16:55:00 UTC · 7 kt
    Observed sustained wind · 27 retained observations; 1 discontinuities. Lines join reported values only; missing intervals are not interpolated.
    Temperature, dew point and pressure trends
    Observed temperature at KFCH (°C)Dots are retained observations. Lines break for missing fields, long intervals or changed station location or units. 1 recorded discontinuities. Dashed lines, when present, are the separately issued NWS forecast.3322°C10-17 17:35Z10-18 16:55Z2026-10-17 17:35:00 UTC · 25 °C2026-10-17 17:55:00 UTC · 26 °C2026-10-17 18:15:00 UTC · 27 °C2026-10-17 18:35:00 UTC · 28 °C2026-10-17 18:55:00 UTC · 29 °C2026-10-17 19:15:00 UTC · 30 °C2026-10-17 19:35:00 UTC · 30 °C2026-10-17 19:55:00 UTC · 30 °C2026-10-17 20:15:00 UTC · 31 °C2026-10-17 20:35:00 UTC · 31 °C2026-10-17 20:55:00 UTC · 31 °C2026-10-17 21:15:00 UTC · 32 °C2026-10-17 21:35:00 UTC · 32 °C2026-10-17 21:55:00 UTC · 32 °C2026-10-17 22:15:00 UTC · 32 °C2026-10-17 22:35:00 UTC · 32 °C2026-10-17 22:55:00 UTC · 32 °C2026-10-17 23:15:00 UTC · 32 °C2026-10-17 23:35:00 UTC · 32 °C2026-10-17 23:55:00 UTC · 32 °C2026-10-18 00:15:00 UTC · 32 °C2026-10-18 00:55:00 UTC · 31 °C2026-10-18 01:15:00 UTC · 31 °C2026-10-18 01:30:00 UTC · 29 °C2026-10-18 16:15:00 UTC · 23 °C2026-10-18 16:35:00 UTC · 24 °C2026-10-18 16:55:00 UTC · 25 °C
    Observed temperature · 27 retained observations; 1 discontinuities. Lines join reported values only; missing intervals are not interpolated.
    Observed dew point at KFCH (°C)Dots are retained observations. Lines break for missing fields, long intervals or changed station location or units. 1 recorded discontinuities. Dashed lines, when present, are the separately issued NWS forecast.5-2°C10-17 17:35Z10-18 16:55Z2026-10-17 17:35:00 UTC · 3 °C2026-10-17 17:55:00 UTC · 2 °C2026-10-17 18:15:00 UTC · 2 °C2026-10-17 18:35:00 UTC · -1 °C2026-10-17 18:55:00 UTC · 0 °C2026-10-17 19:15:00 UTC · -1 °C2026-10-17 19:35:00 UTC · 0 °C2026-10-17 19:55:00 UTC · 0 °C2026-10-17 20:15:00 UTC · 1 °C2026-10-17 20:35:00 UTC · 1 °C2026-10-17 20:55:00 UTC · 1 °C2026-10-17 21:15:00 UTC · 2 °C2026-10-17 21:35:00 UTC · 1 °C2026-10-17 21:55:00 UTC · 3 °C2026-10-17 22:15:00 UTC · 1 °C2026-10-17 22:35:00 UTC · 2 °C2026-10-17 22:55:00 UTC · 2 °C2026-10-17 23:15:00 UTC · 1 °C2026-10-17 23:35:00 UTC · 2 °C2026-10-17 23:55:00 UTC · 2 °C2026-10-18 00:15:00 UTC · 1 °C2026-10-18 00:55:00 UTC · 1 °C2026-10-18 01:15:00 UTC · 3 °C2026-10-18 01:30:00 UTC · 4 °C2026-10-18 16:15:00 UTC · 4 °C2026-10-18 16:35:00 UTC · 3 °C2026-10-18 16:55:00 UTC · 3 °C
    Observed dew point · 27 retained observations; 1 discontinuities. Lines join reported values only; missing intervals are not interpolated.

    Observed sea-level pressure: no readable observations.

    Observed reports as a table (27)
    Observed (UTC)Wind / gust (kt)From (° true)Temperature / dew point (°C)Pressure (mb)Visibility (mi)
    2026-10-17 17:35:00 UTC0 / Not reportedCalm25 / 3Not reported10 or more
    2026-10-17 17:55:00 UTC0 / Not reportedCalm26 / 2Not reported10 or more
    2026-10-17 18:15:00 UTC0 / Not reportedCalm27 / 2Not reported9
    2026-10-17 18:35:00 UTC0 / Not reportedCalm28 / -1Not reported10 or more
    2026-10-17 18:55:00 UTC0 / Not reportedCalm29 / 0Not reported10 or more
    2026-10-17 19:15:00 UTC4 / Not reportedVariable30 / -1Not reported10 or more
    2026-10-17 19:35:00 UTC3 / Not reported28030 / 0Not reported10 or more
    2026-10-17 19:55:00 UTC0 / Not reportedCalm30 / 0Not reported10 or more
    2026-10-17 20:15:00 UTC4 / Not reported20031 / 1Not reported10 or more
    2026-10-17 20:35:00 UTC6 / Not reported26031 / 1Not reported10 or more
    2026-10-17 20:55:00 UTC5 / Not reported25031 / 1Not reported10 or more
    2026-10-17 21:15:00 UTC4 / Not reported25032 / 2Not reported10 or more
    2026-10-17 21:35:00 UTC6 / Not reported33032 / 1Not reported9
    2026-10-17 21:55:00 UTC5 / Not reported26032 / 3Not reported10 or more
    2026-10-17 22:15:00 UTC5 / Not reported20032 / 1Not reported10 or more
    2026-10-17 22:35:00 UTC4 / Not reported28032 / 2Not reported10 or more
    2026-10-17 22:55:00 UTC4 / Not reported24032 / 2Not reported10 or more
    2026-10-17 23:15:00 UTC0 / Not reportedCalm32 / 1Not reported10 or more
    2026-10-17 23:35:00 UTC0 / Not reportedCalm32 / 2Not reported10 or more
    2026-10-17 23:55:00 UTC0 / Not reportedCalm32 / 2Not reported10 or more
    2026-10-18 00:15:00 UTC0 / Not reportedCalm32 / 1Not reported10 or more
    2026-10-18 00:55:00 UTC0 / Not reportedCalm31 / 1Not reported10 or more
    2026-10-18 01:15:00 UTC0 / Not reportedCalm31 / 3Not reported10 or more
    2026-10-18 01:30:00 UTC0 / Not reportedCalm29 / 4Not reported10 or more
    2026-10-18 16:15:00 UTC7 / Not reported11023 / 4Not reported10 or more
    2026-10-18 16:35:00 UTC6 / Not reported11024 / 3Not reported10 or more
    2026-10-18 16:55:00 UTC7 / Not reported12025 / 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 17:35:00 UTC, captured 2026-10-17 17:45:06.189Z; source body SHA-256 bb47c96590121b41a9feeb311f7c3d41c980d6bcd8429c717331c431e9054539.
    • Observed 2026-10-17 17:55:00 UTC, captured 2026-10-17 18:00:07.907Z; source body SHA-256 87f841dd0eda299799ecfa27669c14712906e9b7f2462af1e9aaebc60f5a4644.
    • Observed 2026-10-17 18:15:00 UTC, captured 2026-10-17 18:30:06.364Z; source body SHA-256 0d6d9bc3bb7f43638efd34fe901008409d28d015405c8aad14dafa1075c4d4b1.
    • Observed 2026-10-17 18:35:00 UTC, captured 2026-10-17 18:45:08.637Z; source body SHA-256 d8857538eb4d7da46d85d75840aca2483dedb9a12ab990ee530f470cf5baeaa4.
    • Observed 2026-10-17 18:55:00 UTC, captured 2026-10-17 19:15:08.055Z; source body SHA-256 9b1ec8d3a0f8f89c0d1ebd7a0bd7e7ce037e6cc9a183d6538ed27218bec705c5.
    • Observed 2026-10-17 19:15:00 UTC, captured 2026-10-17 19:30:06.052Z; source body SHA-256 aa7b05d3d8cd0f26f9597345b6479a140b0f5645da83ed257a55986a53983c29.
    • Observed 2026-10-17 19:35:00 UTC, captured 2026-10-17 19:45:05.971Z; source body SHA-256 9a8252eafc94ab71bcce3ec09e0dd29ff50a2f9cb59878a245bd6cdcc185a2f6.
    • Observed 2026-10-17 19:55:00 UTC, captured 2026-10-17 20:00:08.337Z; source body SHA-256 b75985c438912b2da4a26e309fc2fbabef235be8a13c5848c5c5d64297850019.
    • Observed 2026-10-17 20:15:00 UTC, captured 2026-10-17 20:30:06.143Z; source body SHA-256 ef311b664ea18e802db618b518e916a1e3a6226db66bb0132936ea67c8e53edc.
    • Observed 2026-10-17 20:35:00 UTC, captured 2026-10-17 20:45:06.494Z; source body SHA-256 0a537b539c8d4f94e8b1348aba2bd8ded45ddcc4f2412f7bde6463c3fc2b987f.
    • Observed 2026-10-17 20:55:00 UTC, captured 2026-10-17 21:00:07.279Z; source body SHA-256 79c0cc8ae6d502baffa56263b2daf4c86fd1628f11d5a529402c527d0ff32fe1.
    • Observed 2026-10-17 21:15:00 UTC, captured 2026-10-17 21:30:06.193Z; source body SHA-256 6b760689fb92c2907448786a9f1cd24c46a53abec34ae808d02482425d2f20be.
    • Observed 2026-10-17 21:35:00 UTC, captured 2026-10-17 21:45:08.029Z; source body SHA-256 db20397de7bdb6dfebf6351bdecaf5c73a0c8bb695487d415e435ccd1ae7f173.
    • Observed 2026-10-17 21:55:00 UTC, captured 2026-10-17 22:00:07.362Z; source body SHA-256 f1fa85855e007d5d5b85e6dbf4575f6d6bfe58fd5c9a7bb6d9e9cc636ec4c3b2.
    • Observed 2026-10-17 22:15:00 UTC, captured 2026-10-17 22:30:06.387Z; source body SHA-256 ee800e649e35fae1655c5e482ca1b227e0961c02593fed069f69c2209017cbce.
    • Observed 2026-10-17 22:35:00 UTC, captured 2026-10-17 22:45:07.760Z; source body SHA-256 51938b1186526637d24b7545f93bc3e461e7b8bf18f3132a138ba4d2be8ed037.
    • Observed 2026-10-17 22:55:00 UTC, captured 2026-10-17 23:15:09.343Z; source body SHA-256 c50273d54023d9eed3fa370998416e92a710a0360dfdf59dd328dfb33e4357f3.
    • Observed 2026-10-17 23:15:00 UTC, captured 2026-10-17 23:30:06.919Z; source body SHA-256 0810dfeebf9b707b97dadc235e485226db4bcabaca108a8bb7ae809aa4923555.
    • Observed 2026-10-17 23:35:00 UTC, captured 2026-10-17 23:45:07.989Z; source body SHA-256 7d94b1744f678c4004984beceb9339123acb31a327423c214ece3a85d74f5b57.
    • Observed 2026-10-17 23:55:00 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 00:55:00 UTC, captured 2026-10-18 01:00:10.019Z; source body SHA-256 949eb463d93270208adccd66994771bf859674b804d78a93f2b1e78571af9b73.
    • 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 01:30:00 UTC, captured 2026-10-18 01:45:08.112Z; source body SHA-256 13cad0e15a9b698bf0b792427bc82dd8fc2190754fc0585e8c712116a178328a.
    • Observed 2026-10-18 16:15:00 UTC, captured 2026-10-18 16:30:06.518Z; source body SHA-256 9bcdb526eb278d53447ad49f836a4840190afc933c3fb2bf4aba2dca50f759d5.
    • Observed 2026-10-18 16:35:00 UTC, captured 2026-10-18 16:45:08.565Z; source body SHA-256 318997703f4116613adcd89b46ba0f2fe1a5417749453f7700d3984bdd9280f6.
    • Observed 2026-10-18 16:55:00 UTC, captured 2026-10-18 17:00:06.399Z; source body SHA-256 c006e676533fb42ac5e8536e9cb2b841c874883c562d965a13f7c70c3f3b5cfc.

    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 2026-10-17T17:23:07.533Z through 2026-10-18T17:23:04.594Z
    • outlooks: retained from 2026-10-17T17:23:07.533Z through 2026-10-18T17:20:06.066Z
    • hydro: retained from 2026-10-17T17:23:07.533Z through 2026-10-18T17:15:06.550Z
    • analysis: retained from 2026-10-17T17:23:07.533Z through 2026-10-18T17:15:08.503Z
    • winter: retained from 2026-10-17T17:23:07.533Z through 2026-10-18T17:23:04.980Z

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

    Checks every minute; each layer keeps its own time.

    Spotlight: SPC Day 1 outlook

    1 of 5

    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.

    Radar

    NOAA’s radar for the area, loaded by your browser as on the Radar page.

    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 16:31Z.

    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
    California (NWS states: CA)
    Hazards
    Severe thunderstorm warnings, watches and advisories, and the forecasts for them
    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

    No warning, watch or advisory for these hazards is in force in this area.

    NWS’s alerts checked : a successful check, so this is none in force, not “can’t tell”.

    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.