Alert archive / California / Flash Flood Warnings in 2025
Flash Flood Warning 21, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 25, 2025, 3:21 PM PDT for Imperial County, California. It was in force for 4 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 25, 2025, 3:21 PM PDT (22:21 UTC)
- Expired
- Aug 25, 2025, 7:15 PM PDT
- In force
- 4 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Imperial County, CA
The radar
The San Diego radar (KNKX), 96 km from the middle of the area, began a volume at 22:22 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 25, 4:00 PM PDT | FLASH FLOOD | 17 Ssw Winona, CA | ***DELAYED REPORT*** Public shared photos of flooding across Split Mountain Rd at Fish Creek Wash. Part of the road was washed out. Time estimated based on radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 10.4 hours before the alert went out and 112 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1772 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
368
WGUS55 KPSR 252221
FFWPSR
CAC025-260215-
/O.NEW.KPSR.FF.W.0021.250825T2221Z-250826T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
321 PM PDT Mon Aug 25 2025
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
West Central Imperial County in southeastern California...
* Until 715 PM PDT.
* At 321 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 1.5 inches of
rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
mainly rural areas of West Central Imperial County
This includes CA Route 78 between mile markers 1 and 9.
This includes the following streams and drainages...
San Felipe Creek, Tarantula Wash, Fish Creek Wash, Carrizo Wash
and Gert Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3298 11589 3295 11594 3291 11604 3290 11610
3300 11610 3303 11610 3307 11610 3307 11608
3313 11608 3315 11608 3313 11591
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
INS2 follow-up statements
006
WGUS75 KPSR 252352
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
452 PM PDT Mon Aug 25 2025
CAC025-260215-
/O.CON.KPSR.FF.W.0021.000000T0000Z-250826T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Imperial CA-
452 PM PDT Mon Aug 25 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM PDT THIS
EVENING FOR WEST CENTRAL IMPERIAL COUNTY...
At 452 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
mainly rural areas of West Central Imperial County
This includes CA Route 78 near mile marker 1...and
near mile marker 10...and
between mile markers 2 and 9.
This includes the following streams and drainages...
San Felipe Creek, Tarantula Wash, Fish Creek Wash, Carrizo Wash
and Gert Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3298 11589 3295 11594 3291 11604 3290 11610
3300 11610 3303 11610 3307 11610 3307 11608
3313 11608 3315 11608 3313 11591
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
INS946
WGUS75 KPSR 260211
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
711 PM PDT Mon Aug 25 2025
CAC025-260221-
/O.EXP.KPSR.FF.W.0021.000000T0000Z-250826T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Imperial CA-
711 PM PDT Mon Aug 25 2025
...FLASH FLOOD WARNING AT 715 PM PDT THIS EVENING FOR WEST CENTRAL
IMPERIAL COUNTY HAS BEEN REPLACED WITH A FLOOD WARNING...
&&
LAT...LON 3298 11589 3295 11594 3291 11604 3290 11610
3300 11610 3303 11610 3307 11610 3307 11608
3313 11608 3315 11608 3313 11591
$$
INSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 2:00 AM PDT | Flood Watch | PSR | Imperial, Riverside | 19 hr |
| Aug 25, 6:57 AM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
| Aug 25, 7:56 AM PDT | Areal Flood Advisory | PSR | Riverside | 2 hr |
| Aug 25, 1:23 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 52 min |
| Aug 25, 2:08 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 52 min |
| Aug 25, 2:11 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 49 min |
| Aug 25, 2:37 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 38 min |
| Aug 25, 2:42 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 33 min |
| Aug 25, 2:55 PM PDT | Areal Flood Advisory | PSR | Imperial | 4 hr |
| Aug 25, 3:00 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Aug 25, 3:10 PM PDT | Dust Storm Advisory | PSR | Imperial | 65 min |
| Aug 25, 3:12 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 48 min |
| Aug 25, 3:25 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Aug 25, 3:32 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Aug 25, 3:40 PM PDT | Flash Flood Warning | PSR | Riverside, San Bernardino | 4 hr |
| Aug 25, 3:57 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Aug 25, 4:15 PM PDT | Special Weather Statement | PSR | Riverside | 45 min |
| Aug 25, 4:38 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
Nearby
Flash Flood Warnings in California, 2025Every flash flood warning in 2025
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.