Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 112, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 30, 2021, 3:11 PM PDT for Imperial County, California. It was in force for 5 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
- Jul 30, 2021, 3:11 PM PDT (22:11 UTC)
- Expired
- Jul 30, 2021, 8:15 PM PDT
- In force
- 5 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), 105 km from the middle of the area, began a volume at 22:15 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, 10.2 hours before the alert went out and 118 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
- 2147 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
372
WGUS55 KPSR 302211
FFWPSR
CAC025-310315-
/O.NEW.KPSR.FF.W.0112.210730T2211Z-210731T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
311 PM PDT Fri Jul 30 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Southwestern Imperial County in southeastern California...
* Until 815 PM PDT.
* At 311 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain south of the border. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts up to 1 inch are possible
in the warned area. Runoff from this rain will make its way north.
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...
Ocotillo and Mountain Spring.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3270 11611 3276 11604 3273 11596 3271 11584
3272 11569 3265 11572 3262 11611
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MS2 follow-up statements
313
WGUS75 KPSR 310042
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
542 PM PDT Fri Jul 30 2021
CAC025-310315-
/O.CON.KPSR.FF.W.0112.000000T0000Z-210731T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Imperial CA-
542 PM PDT Fri Jul 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM PDT THIS
EVENING FOR SOUTHWESTERN IMPERIAL COUNTY...
At 542 PM PDT, Doppler radar indicated between 1 and 2 inches of
rain have fallen south of the border. This water will make its way
north and likely impact portions of Imperial County. Flash flooding
is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Ocotillo and Mountain Spring.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3270 11611 3276 11604 3273 11596 3271 11584
3272 11569 3265 11572 3262 11611
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MS109
WGUS75 KPSR 310309
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
809 PM PDT Fri Jul 30 2021
CAC025-310319-
/O.EXP.KPSR.FF.W.0112.000000T0000Z-210731T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Imperial CA-
809 PM PDT Fri Jul 30 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 815 PM PDT THIS EVENING 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.
LAT...LON 3270 11611 3276 11604 3273 11596 3271 11584
3272 11569 3265 11572 3262 11611
$$
INSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 2:01 PM PDT | Special Weather Statement | PSR | Imperial | 29 min |
| Jul 30, 3:45 PM PDT | Special Weather Statement | PSR | Riverside | 30 min |
| Jul 30, 3:55 PM PDT | Flash Flood Warning | PSR | Riverside, San Bernardino | 4 hr |
| Jul 30, 4:20 PM PDT | Special Weather Statement | PSR | Imperial | 25 min |
| Jul 30, 4:37 PM PDT | Special Weather Statement | PSR | Riverside | 23 min |
| Jul 30, 4:48 PM PDT | Special Weather Statement | PSR | Imperial | 27 min |
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.