Data health

Storm Mode / Tracked area

Winter: Arizona

Wall mode

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

Current alert feed · checked

Warnings in area

0 of 0 alerts

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

Watched places

Places saved on this device appear here with scripting enabled.

Find or save a place
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 2026-10-18 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.

Open the complete replay reader (works without scripting or WebGL)
Radar-derived cells (11) · current

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

  1. FSX / A9 · scan 2026-10-18T13:54:25Z · current
  2. FSX / J9 · scan 2026-10-18T13:54:25Z · current
  3. IWA / K0 · scan 2026-10-18T13:54:18Z · current
  4. IWA / L0 · scan 2026-10-18T13:54:18Z · current
  5. IWA / Q0 · scan 2026-10-18T13:54:18Z · current
  6. IWA / U0 · scan 2026-10-18T13:54:18Z · current
  7. IWA / V0 · scan 2026-10-18T13:54:18Z · current
  8. YUX / F5 · scan 2026-10-18T13:53:33Z · current
  9. YUX / H6 · scan 2026-10-18T13:53:33Z · current
  10. YUX / M6 · scan 2026-10-18T13:53:33Z · current
  11. YUX / T5 · scan 2026-10-18T13:53:33Z · current
Station and river observations (31)

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 31 of 31 listed sources. All surface stations and retained trends · All supported gauges and forecasts

Selected details

Close

Tracked observation no longer available

Continuity ended, the ID changed, or the observation left the feed. Following has stopped. Choose a current candidate in the cell list; warnings remain independent.

Recent source changes

Recording coverage and limits
  • warnings: retained from 2026-10-17T14:00:54.437Z through 2026-10-18T14:00:07.819Z
  • outlooks: retained from 2026-10-17T14:00:54.437Z through 2026-10-18T14:00:07.873Z
  • hydro: retained from 2026-10-17T14:00:54.437Z through 2026-10-18T13:55:07.558Z
  • analysis: retained from 2026-10-17T14:00:54.437Z through 2026-10-18T14:00:06.781Z
  • winter: retained from 2026-10-17T14:00:54.437Z through 2026-10-18T13:53:04.405Z

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: Winter Storm Severity Index

1 of 7

Winter Storm Severity Index

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

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: no chance drawn for Day 1. Data: NOAA/NWS/WPC.

Chance of at least 4 inches of snow, Day 1

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

No winter or cold watch, warning or advisory in force in this area.

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.

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

The whole discussion

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

Radar, winter preset

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.

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 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
Arizona (NWS states: AZ)
Hazards
Winter 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.