Data health

Storm Mode / Retained evidence

Michigan

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)

REPLAY · 2026-10-17T08:57:52.400Z

Known-by uses retained collector checkpoints. Valid-at can include late captured warning messages and imagery with earlier source times. Neither reconstructs exact browser publication history.

Named NWS geography or exact geometry overlap; monitoring context, not common storm causation.

No retained radar at or before this cursor within its 8-minute tolerance. No present-day image is substituted.

Historical weather is not current protective-action guidance.

Return to the live workspace

Alerts at replay cursor

11 retained alerts · 2026-10-17 08:57:52.400Z. Historical evidence, not current protective-action guidance.

Replay details

Choose a retained alert. Camera and cursor stay fixed while inspecting it.

Retained radar-local cells (0)

No retained cell frame within ten minutes; the cell archive targets six hours.

    Retained stations (65) and gauges (0)

    Individual report times at or before the cursor. Stations: 90-minute tolerance; rivers: three-hour tolerance. Forecast hydrographs are separate products. Unavailable recordings are not zero weather.

    • K8D4 · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature 1 °C
    • KACB · 2026-10-17 08:35:00 UTC · wind 0 kt · temperature 1 °C
    • KADG · 2026-10-17 08:16:00 UTC · wind 9 kt · temperature 3.9 °C
    • KAMN · 2026-10-17 08:35:00 UTC · wind 4 kt · temperature -1 °C
    • KAPN · 2026-10-17 07:54:00 UTC · wind 4 kt · temperature 0.6 °C
    • KARB · 2026-10-17 07:53:00 UTC · wind not reported · temperature not reported
    • KAZO · 2026-10-17 07:53:00 UTC · wind 7 kt · temperature 1.7 °C
    • KBAX · 2026-10-17 08:35:00 UTC · wind 9 kt · temperature 4 °C
    • KBEH · 2026-10-17 07:53:00 UTC · wind 3 kt · temperature 3.3 °C
    • KBFA · 2026-10-17 08:35:00 UTC · wind 3 kt · temperature 0 °C
    • KBIV · 2026-10-17 07:53:00 UTC · wind 3 kt · temperature 3.3 °C
    • KBTL · 2026-10-17 07:53:00 UTC · wind 5 kt · temperature 1.7 °C
    • KCAD · 2026-10-17 08:35:00 UTC · wind 0 kt · temperature -2 °C
    • KCFS · 2026-10-17 08:35:00 UTC · wind 6 kt · temperature 4 °C
    • KCMX · 2026-10-17 07:53:00 UTC · wind 3 kt · temperature 2.2 °C
    • KCVX · 2026-10-17 08:35:00 UTC · wind 9 kt · temperature 6 °C
    • KD95 · 2026-10-17 08:35:00 UTC · wind 5 kt · temperature 3 °C
    • KDET · 2026-10-17 07:53:00 UTC · wind 10 kt · temperature 5.6 °C
    • KDRM · 2026-10-17 08:35:00 UTC · wind 0 kt · temperature 0 °C
    • KDTW · 2026-10-17 07:53:00 UTC · wind 9 kt · temperature 6.1 °C
    • KDUH · 2026-10-17 08:35:00 UTC · wind 9 kt · temperature 5 °C
    • KERY · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature 1 °C
    • KFFX · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature 2 °C
    • KFKS · 2026-10-17 08:35:00 UTC · wind 5 kt · temperature 7 °C
    • KFNT · 2026-10-17 07:53:00 UTC · wind 8 kt · temperature 2.8 °C
    • KFPK · 2026-10-17 08:35:00 UTC · wind 4 kt · temperature 2 °C
    • KGDW · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature -1 °C
    • KGLR · 2026-10-17 07:53:00 UTC · wind 0 kt · temperature 0.6 °C
    • KHAI · 2026-10-17 08:35:00 UTC · wind 4 kt · temperature 4 °C
    • KHTL · 2026-10-17 07:53:00 UTC · wind 4 kt · temperature 1.1 °C
    • KHYX · 2026-10-17 08:35:00 UTC · wind 9 kt · temperature 2 °C
    • KIKW · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature -1 °C
    • KIMT · 2026-10-17 07:54:00 UTC · wind 0 kt · temperature -0.6 °C
    • KIRS · 2026-10-17 08:35:00 UTC · wind 7 kt · temperature 3 °C
    • KISQ · 2026-10-17 08:35:00 UTC · wind 4 kt · temperature -2 °C
    • KIWD · 2026-10-17 07:56:00 UTC · wind 5 kt · temperature -1.1 °C
    • KJXN · 2026-10-17 07:56:00 UTC · wind 4 kt · temperature 2.8 °C
    • KJYM · 2026-10-17 08:35:00 UTC · wind 8 kt · temperature 2 °C
    • KLDM · 2026-10-17 08:35:00 UTC · wind 1 kt · temperature 1 °C
    • KLWA · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature 3 °C
    • KMBL · 2026-10-17 07:56:00 UTC · wind 0 kt · temperature 0.6 °C
    • KMBS · 2026-10-17 07:53:00 UTC · wind 7 kt · temperature 1.7 °C
    • KMGN · 2026-10-17 08:35:00 UTC · wind 6 kt · temperature 0 °C
    • KMOP · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature 0 °C
    • KOEB · 2026-10-17 08:35:00 UTC · wind 6 kt · temperature 2 °C
    • KONZ · 2026-10-17 08:35:00 UTC · wind 12 kt · temperature 6 °C
    • KOSC · 2026-10-17 08:35:00 UTC · wind 5 kt · temperature -1 °C
    • KOZW · 2026-10-17 08:35:00 UTC · wind 7 kt · temperature 2 °C
    • KP59 · 2026-10-17 07:51:00 UTC · wind 3 kt · temperature 3.9 °C
    • KPLN · 2026-10-17 07:54:00 UTC · wind 0 kt · temperature -2.2 °C
    • KPTK · 2026-10-17 07:53:00 UTC · wind 12 kt · temperature 3.9 °C
    • KPZQ · 2026-10-17 08:35:00 UTC · wind 8 kt · temperature 3 °C
    • KRMY · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature 2 °C
    • KRNP · 2026-10-17 08:35:00 UTC · wind 6 kt · temperature 2 °C
    • KRQB · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature 1 °C
    • KSAW · 2026-10-17 08:38:00 UTC · wind 3 kt · temperature -1 °C
    • KSJX · 2026-10-17 08:35:00 UTC · wind 2 kt · temperature 1 °C
    • KSLH · 2026-10-17 08:36:00 UTC · wind 1 kt · temperature -1 °C
    • KTEW · 2026-10-17 08:35:00 UTC · wind 5 kt · temperature 1.7 °C
    • KTTF · 2026-10-17 08:35:00 UTC · wind 10 kt · temperature 5 °C
    • KTVC · 2026-10-17 07:53:00 UTC · wind 7 kt · temperature 6.1 °C
    • KVLL · 2026-10-17 08:35:00 UTC · wind 9 kt · temperature 5 °C
    • KY31 · 2026-10-17 08:35:00 UTC · wind 5 kt · temperature 0 °C
    • KY70 · 2026-10-17 08:35:00 UTC · wind 4 kt · temperature 1 °C
    • KYIP · 2026-10-17 07:53:00 UTC · wind 7 kt · temperature 4.4 °C
    Snow depth at cursor

    Footprint metadata valid 2026-10-17 00:00:00 UTC; captured 2026-10-17 06:08:57.387Z. Pixel analysis time is unverified. Original retained picture, legend and provenance

    Snow water equivalent at cursor

    Footprint metadata valid 2026-10-17 00:00:00 UTC; captured 2026-10-17 05:23:03.510Z. Pixel analysis time is unverified. Original retained picture, legend and provenance

    GLM density, velocity and specialty live layers are not retained by this replay archive and are hidden. Use Live for their current source-qualified views.

    Winter Storm Severity Index · captured source context

    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 · captured source context

    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, the 24 hours to , WPC’s forecast from . Each band runs to the next. Data: NOAA/NWS/WPC.

    Chance of at least 4 inches of snow, Day 1 · captured source context

    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 · captured source context
    • Freeze Warning 4 1 not yet in effect · until · NWS Detroit/Pontiac MI, NWS Grand Rapids MI, NWS Green Bay WI, NWS Northern Indiana
    • Frost Advisory 7 2 not yet in effect · until · NWS Detroit/Pontiac MI, NWS Grand Rapids MI, NWS Northern Indiana

    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 · captured source context

    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 · captured source context

    The whole discussion

    Issued , for to . WPC’s words, as written. Data: NOAA/NWS/WPC.

    SPC Day 1 outlook · captured source context
    • General Thunderstorms Risk

    SPC’s Day 1 categorical outlook, valid to , issued . SPC’s categories, as drawn. Data: NOAA/SPC.

    Watches · captured source context

    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 · captured source context

    No mesoscale discussion reaches this area.

    SPC’s mesoscale discussions whose outline reaches the area. Data: NOAA/SPC.

    Storm ingredients · captured source context

    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 · captured source context
    • Marginal
    • Slight

    WPC’s excessive rainfall outlook, to , issued : a chance of flash flooding, in four categories. Data: NOAA/WPC.

    River gauges in flood · captured source context

    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 · captured source context

    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.

    Source checks at the cursor