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.
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
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.
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.
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.
Select a row or map feature for its official details. Overlapping features offer a choice; all peer warnings remain in the list.
Recent source changes
day3-intensity · source-revision · Recorded 2026-10-18T07:35:05.808Z
day3-probability · source-revision · Recorded 2026-10-18T07:35:05.808Z
day3-narrative · source-revision · Recorded 2026-10-18T07:35:05.808Z
office-hwo · source-revision · Recorded 2026-10-18T07:35:05.808Z
day3-categorical · source-revision · Recorded 2026-10-18T07:35:05.808Z
office-afd · source-revision · Recorded 2026-10-18T07:35:05.808Z
surface-analysis · source-revision · Recorded 2026-10-18T07:30:06.796Z
metars · source-revision · Recorded 2026-10-18T07:30:06.796Z
Recording coverage and limits
warnings: retained from 2026-10-17T07:36:56.058Z through 2026-10-18T07:36:04.051Z
outlooks: retained from 2026-10-17T07:36:56.058Z through 2026-10-18T07:35:05.808Z
hydro: retained from 2026-10-17T07:36:56.058Z through 2026-10-18T07:35:05.320Z
analysis: retained from 2026-10-17T07:36:56.058Z through 2026-10-18T07:30:06.796Z
winter: retained from 2026-10-17T07:36:56.058Z through 2026-10-18T07:08:05.613Z
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.
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.
Soundings: what weather balloons measured
Observed Sounding at Bismarck, ND (BIS), for (7 h 36 min ago). SPC’s graphic; the values in its panels (CAPE, shear, the indices) are SPC’s computations from these levels. Data: NOAA/SPC.
A balloon launched about an hour before the time named, measuring as it rose and drifted with the wind: the atmosphere above one place, at one time. Model soundings, which are forecasts, are not shown here.
The levels this sounding was drawn from (55)
Bismarck, ND (BIS): the surface first, then up through the atmosphere. Temperature and dew point in °C, as measured.
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.”
WPC’s Probabilistic Winter Precipitation Forecast, to , issued . Outlines, as WPC draws them. Data: NOAA/NWS/WPC.
Winter watches, warnings and advisories
Frost Advisory71 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.
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.
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.
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.
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
