Data health

Storm Mode / Tracked area

Coastal flooding: South Dakota

Wall mode

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

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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.

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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 06:00:00 UTC, picture retrieved 2026-10-18 12:23:04.796 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

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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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 (23)

    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 23 of 23 listed sources. All surface stations and retained trends · All supported gauges and forecasts

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    Water-level gauge SPGS2

    current · Observed 9.61 ft at 2026-10-18 11:15:00 UTC · Action stage.

    Lake or reservoir level · Springfield · Missouri River · -97.885, 42.855833000000004. Units ft; datum not supplied.

    Source checked 2026-10-18 13:25:05.398Z · current.

    Stage in this gauge’s units, not a regional flood depth. Tide/lake gauges remain water levels; datum is not supplied by this feed. Historical observations and the latest forecast keep separate times.

    Retained observations: 21; target 24 hours, at most 96 reports per station. Recording began 2026-10-17 06:15:05.234Z; oldest available reading 2026-10-17 15:15:00 UTC.

    Observed stage and separate NWS forecast at SPGS2 (ft)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.10.68.4ft10-17 15:15Z10-18 11:15Z2026-10-17 15:15:00 UTC · 9.4 ft2026-10-17 16:15:00 UTC · 9.41 ft2026-10-17 17:15:00 UTC · 9.42 ft2026-10-17 18:15:00 UTC · 9.42 ft2026-10-17 19:15:00 UTC · 9.43 ft2026-10-17 20:15:00 UTC · 9.45 ft2026-10-17 21:15:00 UTC · 9.46 ft2026-10-17 22:15:00 UTC · 9.47 ft2026-10-17 23:15:00 UTC · 9.46 ft2026-10-18 00:15:00 UTC · 9.47 ft2026-10-18 01:15:00 UTC · 9.49 ft2026-10-18 02:15:00 UTC · 9.51 ft2026-10-18 03:15:00 UTC · 9.49 ft2026-10-18 04:15:00 UTC · 9.5 ft2026-10-18 05:15:00 UTC · 9.52 ft2026-10-18 06:15:00 UTC · 9.52 ft2026-10-18 07:15:00 UTC · 9.53 ft2026-10-18 08:15:00 UTC · 9.56 ft2026-10-18 09:15:00 UTC · 9.59 ft2026-10-18 10:15:00 UTC · 9.61 ft2026-10-18 11:15:00 UTC · 9.61 ft
    Observed stage and separate NWS forecast · 21 retained observations; 0 discontinuities. Lines join reported values only; missing intervals are not interpolated.

    NWS forecast · current

    No forecast maximum supplied.

    Impacts and the full forecast are read for gauges in flood; this one is at action stage.

    Gauge thresholds: action 9.4 ft; minor 11 ft; moderate 13 ft; major 15 ft.

    Observed reports as a table (21)
    Observed (UTC)Stage / unitsSource category / water
    2026-10-17 15:15:00 UTC9.4 ftAction stage · Lake or reservoir level
    2026-10-17 16:15:00 UTC9.41 ftAction stage · Lake or reservoir level
    2026-10-17 17:15:00 UTC9.42 ftAction stage · Lake or reservoir level
    2026-10-17 18:15:00 UTC9.42 ftAction stage · Lake or reservoir level
    2026-10-17 19:15:00 UTC9.43 ftAction stage · Lake or reservoir level
    2026-10-17 20:15:00 UTC9.45 ftAction stage · Lake or reservoir level
    2026-10-17 21:15:00 UTC9.46 ftAction stage · Lake or reservoir level
    2026-10-17 22:15:00 UTC9.47 ftAction stage · Lake or reservoir level
    2026-10-17 23:15:00 UTC9.46 ftAction stage · Lake or reservoir level
    2026-10-18 00:15:00 UTC9.47 ftAction stage · Lake or reservoir level
    2026-10-18 01:15:00 UTC9.49 ftAction stage · Lake or reservoir level
    2026-10-18 02:15:00 UTC9.51 ftAction stage · Lake or reservoir level
    2026-10-18 03:15:00 UTC9.49 ftAction stage · Lake or reservoir level
    2026-10-18 04:15:00 UTC9.5 ftAction stage · Lake or reservoir level
    2026-10-18 05:15:00 UTC9.52 ftAction stage · Lake or reservoir level
    2026-10-18 06:15:00 UTC9.52 ftAction stage · Lake or reservoir level
    2026-10-18 07:15:00 UTC9.53 ftAction stage · Lake or reservoir level
    2026-10-18 08:15:00 UTC9.56 ftAction stage · Lake or reservoir level
    2026-10-18 09:15:00 UTC9.59 ftAction stage · Lake or reservoir level
    2026-10-18 10:15:00 UTC9.61 ftAction stage · Lake or reservoir level
    2026-10-18 11:15:00 UTC9.61 ftAction stage · Lake or reservoir level
    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 15:15:00 UTC, captured 2026-10-17 16:25:05.973Z; source body SHA-256 e0876763ccc093088d69a6a1b4f619ffa0b6c742859010030d0fb249976221d8.
    • Observed 2026-10-17 16:15:00 UTC, captured 2026-10-17 17:25:05.057Z; source body SHA-256 c36dd9d415f28eed67dde3d2d965e267a051389f3b92d63b240abf2112d0845a.
    • Observed 2026-10-17 17:15:00 UTC, captured 2026-10-17 18:25:06.484Z; source body SHA-256 c7b606972c17b5cf2e0734f800efc19fc6ad3fe42ed2b21f2406a7ee6688b790.
    • Observed 2026-10-17 18:15:00 UTC, captured 2026-10-17 19:25:05.413Z; source body SHA-256 8bfe0f6c4fbf418a97ed9a70a42faba76076b63d9ed23ca8958be28ed3e3dfbd.
    • Observed 2026-10-17 19:15:00 UTC, captured 2026-10-17 20:25:05.363Z; source body SHA-256 426ee104d5a51ad7307122bcdabe4a2fc60cca45879c360f44553bfd934cda00.
    • Observed 2026-10-17 20:15:00 UTC, captured 2026-10-17 21:25:04.659Z; source body SHA-256 587d4b429fdb21364a4a40d69af457e0f516a29baf595199eaa813c8160dfd2a.
    • Observed 2026-10-17 21:15:00 UTC, captured 2026-10-17 22:25:06.849Z; source body SHA-256 9bf964242c4addae0d20866f2d831a9e64ccba11ea3c1b463329b9278533380e.
    • Observed 2026-10-17 22:15:00 UTC, captured 2026-10-17 23:25:06.711Z; source body SHA-256 8da59c32db89ffc8bcc344fa162df179ffb3bcfb9c8d6c3d7de078c76c588e37.
    • Observed 2026-10-17 23:15:00 UTC, captured 2026-10-18 00:25:06.204Z; source body SHA-256 d05b4112c083f82757f110a6e33eb3863e102b95953e751bf95dba00c1140de3.
    • Observed 2026-10-18 00:15:00 UTC, captured 2026-10-18 01:25:06.453Z; source body SHA-256 e409fc97034bfb40176782eb786aad2fea65de1c5495bf843e8769c4e41a58d8.
    • Observed 2026-10-18 01:15:00 UTC, captured 2026-10-18 02:25:06.825Z; source body SHA-256 600cff19b0bc179b7e2f42803631ee390bd1b11283628e6a503e222a0e8b3a14.
    • Observed 2026-10-18 02:15:00 UTC, captured 2026-10-18 03:25:06.216Z; source body SHA-256 92f2e27fc506ae63afc75604b8a292744564efc8ffb32faf9d88a12f922eaf04.
    • Observed 2026-10-18 03:15:00 UTC, captured 2026-10-18 04:25:05.971Z; source body SHA-256 029a16616ec9e48a0025d9d2c7b23df7b244f87a026ab38c379d2044e416b75a.
    • Observed 2026-10-18 04:15:00 UTC, captured 2026-10-18 05:25:05.968Z; source body SHA-256 40677afb316e2bbbc9d691a272f0b0584249fae9905f85082632b4cda8d2c8b7.
    • Observed 2026-10-18 05:15:00 UTC, captured 2026-10-18 06:25:07.255Z; source body SHA-256 bbdb5d8c6ac8ff7be76b3e4d06da12e0a7f91808818326c330883d515386c964.
    • Observed 2026-10-18 06:15:00 UTC, captured 2026-10-18 07:25:06.987Z; source body SHA-256 69fe98220b73acbbf241d232d2909186aa6610c9ac7171646f63da1da9f23324.
    • Observed 2026-10-18 07:15:00 UTC, captured 2026-10-18 08:25:07.817Z; source body SHA-256 a1758d3bc70cab0935c46138db08f2a86223299161f86305bd041609184e0cee.
    • Observed 2026-10-18 08:15:00 UTC, captured 2026-10-18 09:25:07.308Z; source body SHA-256 07dbc3d99c4331a20c0bb7fa2d4c5f48cf22e4b1331e16d2064fa65f70d4bf6b.
    • Observed 2026-10-18 09:15:00 UTC, captured 2026-10-18 10:25:08.828Z; source body SHA-256 e475568e8d4b015904ec594136858852549ad52eb8eea66b1014deb8bc172528.
    • Observed 2026-10-18 10:15:00 UTC, captured 2026-10-18 11:25:05.803Z; source body SHA-256 1669243bd59175d64b0664fb7160c400891c7ddb77037b594e2ded9f97e3d0ac.
    • Observed 2026-10-18 11:15:00 UTC, captured 2026-10-18 12:35:05.943Z; source body SHA-256 cbd1e58236ca3fb49bf5a7ea0fc0147357cc40b9a2beb0d15aa361ae7c4b454e.

    Only observed gauge records enter this history. Forecast maxima and forecast hydrograph points never become observations. A missing datum or unsupported flow value remains unknown.

    Observation source page · Cached readings as JSON · Official source

    Recent source changes

    Recording coverage and limits
    • warnings: retained from 2026-10-17T13:26:37.337Z through 2026-10-18T13:26:04.441Z
    • outlooks: retained from 2026-10-17T13:26:37.337Z through 2026-10-18T13:25:05.922Z
    • hydro: retained from 2026-10-17T13:26:37.337Z through 2026-10-18T13:25:06.863Z
    • analysis: retained from 2026-10-17T13:26:37.337Z through 2026-10-18T13:15:09.492Z
    • winter: retained from 2026-10-17T13:26:37.337Z through 2026-10-18T13:23:04.425Z

    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: Radar

    1 of 1

    Radar

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

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    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 13:26Z.

    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
    South Dakota (NWS states: SD)
    Hazards
    Coastal flood 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.