Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 250, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Sep 24, 2021, 8:14 AM PDT for Imperial County, California. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 24, 2021, 8:14 AM PDT (15:14 UTC)
- Expired
- Sep 24, 2021, 12:15 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 Yuma radar (KYUX), 86 km from the middle of the area, began a volume at 15:16 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.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 3.2 hours before the alert went out and 161 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
- 1990 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -36 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
085
WGUS55 KPSR 241514
FFWPSR
CAC025-241915-
/O.NEW.KPSR.FF.W.0250.210924T1514Z-210924T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
814 AM PDT Fri Sep 24 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Southwestern Imperial County in southeastern California...
* Until 1215 PM PDT.
* At 814 AM 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...
El Centro, Calexico, Brawley, Imperial, Plaster City, Holtville,
Westmorland, El Centro Naval Airfield, Mt. Signal, Gordon's Well,
Algodones Dunes, Alamorio, Heber, Bonds Corner, Seeley and
Dixieland.
This includes the following highways...
CA Route 86 near mile marker 1...and
between mile markers 10 and 18.
CA Route 98 between mile markers 10 and 19.
CA Interstate 8 between mile markers 16 and 25.
CA Route 78 between mile markers 14 and 23.
CA Route 111 near mile marker 1...and
between mile markers 10 and 18.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3263 11592 3305 11597 3305 11533 3296 11490
3271 11485
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
INS2 follow-up statements
221
WGUS75 KPSR 241841
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1141 AM PDT Fri Sep 24 2021
CAC025-241915-
/O.CON.KPSR.FF.W.0250.000000T0000Z-210924T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Imperial CA-
1141 AM PDT Fri Sep 24 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 PM PDT THIS
AFTERNOON FOR SOUTHWESTERN IMPERIAL COUNTY...
At 1141 AM PDT, Between 1 and 1.5 inches of rain have fallen earlier
over the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
El Centro, Calexico, Brawley, Imperial, Plaster City, Holtville,
Westmorland, El Centro Naval Airfield, Mt. Signal, Gordon's Well,
Algodones Dunes, Alamorio, Heber, Bonds Corner, Seeley and
Dixieland.
This includes the following highways...
CA Route 86 near mile marker 1...and
between mile markers 10 and 18.
CA Route 98 between mile markers 10 and 19.
CA Interstate 8 between mile markers 16 and 25.
CA Route 78 between mile markers 14 and 23.
CA Route 111 near mile marker 1...and
between mile markers 10 and 18.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3263 11592 3305 11597 3305 11533 3296 11490
3271 11485
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MS959
WGUS75 KPSR 241909
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1209 PM PDT Fri Sep 24 2021
CAC025-241919-
/O.EXP.KPSR.FF.W.0250.000000T0000Z-210924T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Imperial CA-
1209 PM PDT Fri Sep 24 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1215 PM PDT THIS AFTERNOON FOR
SOUTHWESTERN IMPERIAL COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 700 PM PDT Friday for
portions of southeast California and southern California.
LAT...LON 3263 11592 3305 11597 3305 11533 3296 11490
3271 11485
$$
MSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 24, 7:10 AM PDT | Special Weather Statement | PSR | Imperial | 50 min |
| Sep 24, 7:28 AM PDT | Areal Flood Advisory | PSR | Imperial | 46 min |
| Sep 24, 7:33 AM PDT | Severe Thunderstorm Warning | PSR | Imperial | 42 min |
| Sep 24, 8:00 AM PDT | Special Weather Statement | PSR | Imperial | 45 min |
| Sep 24, 8:18 AM PDT | Special Weather Statement | PSR | Imperial | 42 min |
| Sep 24, 9:03 AM PDT | Flash Flood Watch | PSR | Imperial, Riverside, San Bernardino | 10 hr |
Nearby
Flash Flood Warnings in California, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.