Data health

Storm Mode / Tracked area

Flash flooding: 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 09:00:00 UTC, picture retrieved 2026-10-18 17:08:06.654 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 (9) · current

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

  1. IWA / C2 · scan 2026-10-18T17:10:14Z · current
  2. IWA / E2 · scan 2026-10-18T17:10:14Z · current
  3. IWA / G2 · scan 2026-10-18T17:10:14Z · current
  4. IWA / H2 · scan 2026-10-18T17:10:14Z · current
  5. IWA / I2 · scan 2026-10-18T17:10:14Z · current
  6. IWA / J2 · scan 2026-10-18T17:10:14Z · current
  7. IWA / M1 · scan 2026-10-18T17:10:14Z · current
  8. IWA / X1 · scan 2026-10-18T17:10:14Z · current
  9. PHX / I0 · scan 2026-10-18T17:12:43Z · current
Station and river observations (32)

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 32 of 32 listed sources. All surface stations and retained trends · All supported gauges and forecasts

Selected details

Close

Radar IWA · cell I2

Radar-local algorithm observation · scan within budget

Scan
Segment first observed
Retained observations
3 scans · to
Source motion
31 kt toward 18° true (from 198°)
azimuth (source field)
314
range (source field)
77
TVS algorithm flag
NONE
Mesocyclone algorithm flag
NONE
posh (source field)
0
poh (source field)
0
Algorithm hail estimate (in)
0
vil (source field)
1
Maximum reflectivity (dBZ)
40
Height of maximum reflectivity (thousands of ft)
11.1
Echo top (thousands of ft)
11.1
Motion from (degrees true)
198
Source speed (kt)
31

Hail, rotation and TVS fields are algorithm estimates/signatures, not official warnings or confirmation of a tornado. The observed line joins credible scans from this radar only; it is not a future path or arrival forecast.

Following is off until chosen. Dragging the map pauses following.

Data: IEM / NEXRAD Storm Attribute Table. Other radars’ observations remain separate.

Recent source changes

Recording coverage and limits
  • warnings: retained from 2026-10-17T17:18:52.212Z through 2026-10-18T17:18:02.775Z
  • outlooks: retained from 2026-10-17T17:18:52.212Z through 2026-10-18T17:15:07.356Z
  • hydro: retained from 2026-10-17T17:18:52.212Z through 2026-10-18T17:15:06.550Z
  • analysis: retained from 2026-10-17T17:18:52.212Z through 2026-10-18T17:15:08.503Z
  • winter: retained from 2026-10-17T17:18:52.212Z through 2026-10-18T17:08:05.510Z

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: 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; 1 gauge at action stage.

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

Nothing has changed in the last 60 minutes.

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
Flash 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.