Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 124, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 31, 2021, 4:48 PM PDT for Riverside County, California. It was in force for 3 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 31, 2021, 4:48 PM PDT (23:48 UTC)
- Expired
- Jul 31, 2021, 7:43 PM PDT
- In force
- 3 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Riverside County, CA
The radar
The San Diego radar (KNKX), 149 km from the middle of the area, began a volume at 23:49 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, 11.8 hours before the alert went out and 169 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
- 2352 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
190
WGUS55 KPSR 312348
FFWPSR
CAC065-010345-
/O.NEW.KPSR.FF.W.0124.210731T2348Z-210801T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
448 PM PDT Sat Jul 31 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Riverside County in southern California...
* Until 845 PM PDT.
* At 448 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 up to 0.5 inches 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...
Porcupine Wash in Joshua Tree National Park
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3374 11586 3388 11602 3397 11595 3392 11578
3377 11573
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
INS2 follow-up statements
076
WGUS75 KPSR 010059
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
559 PM PDT Sat Jul 31 2021
CAC065-010345-
/O.CON.KPSR.FF.W.0124.000000T0000Z-210801T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
559 PM PDT Sat Jul 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM PDT THIS
EVENING FOR RIVERSIDE COUNTY...
At 559 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 1.5 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Porcupine Wash in Joshua Tree National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3374 11586 3388 11602 3397 11595 3392 11578
3377 11573
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
INS401
WGUS75 KPSR 010243
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
743 PM PDT Sat Jul 31 2021
CAC065-010253-
/O.CAN.KPSR.FF.W.0124.000000T0000Z-210801T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
743 PM PDT Sat Jul 31 2021
...FLASH FLOOD WARNING IS CANCELLED FOR RIVERSIDE COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3374 11586 3388 11602 3397 11595 3392 11578
3377 11573
$$
INSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 5:04 PM PDT | Dust Storm Advisory | PSR | Imperial | 41 min |
| Jul 30, 5:18 PM PDT | Special Weather Statement | PSR | Imperial | 72 min |
| Jul 30, 5:20 PM PDT | Special Weather Statement | PSR | Riverside | 70 min |
| Jul 30, 5:24 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Jul 30, 5:29 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 46 min |
| Jul 30, 5:33 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Jul 30, 5:39 PM PDT | Areal Flood Advisory | PSR | Imperial | 3 hr |
| Jul 30, 5:52 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Jul 30, 5:59 PM PDT | Dust Storm Warning | PSR | Imperial | 45 min |
| Jul 30, 6:06 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Jul 30, 6:11 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 79 min |
| Jul 30, 6:31 PM PDT | Special Weather Statement | PSR | Imperial | 74 min |
| Jul 30, 6:49 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 4 hr |
| Jul 31, 2:32 PM PDT | Special Weather Statement | PSR | Riverside | 28 min |
| Jul 31, 3:47 PM PDT | Special Weather Statement | PSR | Riverside | 28 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.