Data health

Storm Mode / Tracked area

Areal flooding: South Dakota

Wall mode

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

Current alert feed · checked

Warnings in area

7 of 7 alerts
  1. Freeze WarningTraverse; Big Stone; Codington; Grant; Hamlin; DeuelNWS Aberdeen SD · until warning · alerts checked
  2. Freeze WarningLyon; Sioux; Plymouth; Woodbury; Lincoln; Lyon; Murray; Pipestone; Rock; Dixon; Dakota; Kingsbury; Brookings; Miner; Lake; Moody; Hanson; McCook; Minnehaha; Hutchinson; Turner; Lincoln; Bon Homme; Yankton; Clay; Union; Osceola; Dickinson; O'Brien; Clay; Cherokee; Buena Vista; Ida; Cottonwood; Nobles; JacksonNWS Sioux Falls SD · until warning · alerts checked
  3. Freeze WarningHennepin; Ramsey; Douglas; Todd; Morrison; Mille Lacs; Kanabec; Stevens; Pope; Stearns; Benton; Sherburne; Isanti; Chisago; Lac Qui Parle; Swift; Chippewa; Kandiyohi; Meeker; Wright; Anoka; Washington; Yellow Medicine; Renville; McLeod; Sibley; Carver; Scott; Dakota; Redwood; Brown; Nicollet; Le Sueur; Rice; Goodhue; Watonwan; Blue Earth; Waseca; Steele; Martin; Faribault; Freeborn; Polk; Barron; Rusk; St. Croix; Pierce; Dunn; Pepin; Chippewa; Eau ClaireNWS Twin Cities/Chanhassen MN · until warning · alerts checked
  4. Freeze WarningMonona; Harrison; Shelby; Pottawattamie; Mills; Montgomery; Fremont; Page; Knox; Cedar; Thurston; Antelope; Pierce; Wayne; Boone; Madison; Stanton; Cuming; Burt; Platte; Colfax; Dodge; Washington; Butler; Saunders; Douglas; Sarpy; Seward; Lancaster; Cass; Otoe; Saline; Jefferson; Gage; Johnson; Nemaha; Pawnee; RichardsonNWS Omaha/Valley NE · until warning · alerts checked
  5. Freeze WarningArthur; Keith; Perkins; Chase; Eastern Cherry; Keya Paha; Boyd; Brown; Rock; Holt; Hooker; Thomas; Blaine; Loup; Garfield; Wheeler; McPherson; Logan; Custer; Lincoln; Hayes; FrontierNWS North Platte NE · until warning · alerts checked
  6. Frost AdvisoryBrown; Marshall; Roberts; Day; Spink; ClarkNWS Aberdeen SD · until advisory · radar-alerts checked
  7. Frost AdvisoryBeadle; Gregory; Jerauld; Sanborn; Brule; Aurora; Davison; Charles Mix; DouglasNWS Sioux Falls SD · until advisory · radar-alerts checked

Watched places

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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
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 00:00:00 UTC, picture retrieved 2026-10-17 06:08:57.387 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) · unavailable

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

    Station and river observations (29)

    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 29 of 29 listed sources. All surface stations and retained trends · All supported gauges and forecasts

    Selected details

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    Surface station KMBG

    current · Observed 2026-10-17 05:52:00 UTC · wind 11 kt · temperature 6.1 °C.

    Station KMBG · -100.404, 45.543 (longitude, latitude).

    Source checked 2026-10-17 06:45:05.238Z · 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: 1; target 24 hours, at most 96 reports per station. Recording began 2026-10-17 06:15:07.108Z; oldest available reading 2026-10-17 05:52:00 UTC.

    Observed sustained wind at KMBG (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.1210kt10-17 05:52Z10-17 06:52Z2026-10-17 05:52:00 UTC · 11 kt
    Observed sustained wind · 1 retained observations; 0 discontinuities. Lines join reported values only; missing intervals are not interpolated.
    Temperature, dew point and pressure trends
    Observed temperature at KMBG (°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.7.15.1°C10-17 05:52Z10-17 06:52Z2026-10-17 05:52:00 UTC · 6.1 °C
    Observed temperature · 1 retained observations; 0 discontinuities. Lines join reported values only; missing intervals are not interpolated.
    Observed dew point at KMBG (°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.1-1°C10-17 05:52Z10-17 06:52Z2026-10-17 05:52:00 UTC · 0 °C
    Observed dew point · 1 retained observations; 0 discontinuities. Lines join reported values only; missing intervals are not interpolated.
    Observed sea-level pressure at KMBG (mb)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.1027.91025.9mb10-17 05:52Z10-17 06:52Z2026-10-17 05:52:00 UTC · 1026.9 mb
    Observed sea-level pressure · 1 retained observations; 0 discontinuities. Lines join reported values only; missing intervals are not interpolated.
    Observed reports as a table (1)
    Observed (UTC)Wind / gust (kt)From (° true)Temperature / dew point (°C)Pressure (mb)Visibility (mi)
    2026-10-17 05:52:00 UTC11 / Not reported1506.1 / 01026.910 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 05:52:00 UTC, captured 2026-10-17 06:15:07.108Z; source body SHA-256 bc11437b0ef17dcf4b91f1dd747598a8f12e615b799dd81a79f1255842a6924c.

    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 2026-10-16T06:47:36.551Z through 2026-10-17T06:47:02.839Z
    • outlooks: retained from 2026-10-16T06:47:36.551Z through 2026-10-17T06:45:06.184Z
    • hydro: retained from 2026-10-16T06:47:36.551Z through 2026-10-17T06:45:07.531Z
    • analysis: retained from 2026-10-16T06:47:36.551Z through 2026-10-17T06:45:06.740Z
    • winter: retained from 2026-10-16T06:47:36.551Z through 2026-10-17T06:38:03.621Z

    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.

    Spotlight: Flash-flood risk, Day 1

    1 of 4

    Flash-flood risk, Day 1

    • Marginal

    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.

    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 06:42Z.

    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
    Areal 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.