Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 140, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 10, 2021, 9:54 PM PDT for Riverside County, California. It was in force for 86 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 10, 2021, 9:54 PM PDT (04:54 UTC)
- Expired
- Aug 10, 2021, 11:20 PM PDT
- In force
- 86 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Riverside County, CA
The radar
The Yuma radar (KYUX), 151 km from the middle of the area, began a volume at 04:57 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 00:00Z, 4.9 hours before the alert went out and 210 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
- 3091 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
300
WGUS55 KPSR 110454
FFWPSR
CAC065-111100-
/O.NEW.KPSR.FF.W.0140.210811T0454Z-210811T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
954 PM PDT Tue Aug 10 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Riverside County in southern California...
* Until 400 AM PDT Wednesday.
* At 954 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 2 inches of rain have
fallen. Additional rainfall amounts up 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...
Desert Center.
This includes the following highways...
CA Route 177 near mile marker 1...and
between mile markers 10 and 13...and
between mile markers 2 and 6.
CA Interstate 10 between mile markers 102 and 111.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3385 11513 3380 11508 3370 11506 3359 11520
3355 11537 3365 11548 3378 11544 3382 11539
3386 11530 3385 11521
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Hirsch1 follow-up statement
248
WGUS75 KPSR 110620
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1120 PM PDT Tue Aug 10 2021
CAC065-110630-
/O.CAN.KPSR.FF.W.0140.000000T0000Z-210811T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
1120 PM PDT Tue Aug 10 2021
...FLASH FLOOD WARNING IS CANCELLED FOR RIVERSIDE COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3385 11513 3380 11508 3370 11506 3359 11520
3355 11537 3365 11548 3378 11544 3382 11539
3386 11530 3385 11521
$$
HirschThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 6:30 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 45 min |
| Aug 10, 7:15 PM PDT | Dust Storm Warning | PSR | Imperial, Riverside, San Bernardino | 60 min |
| Aug 10, 7:26 PM PDT | Severe Thunderstorm Warning | PSR | Imperial, Riverside | 49 min |
| Aug 10, 7:33 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 4 hr |
| Aug 10, 8:18 PM PDT | Severe Thunderstorm Warning | PSR | Imperial, Riverside | 57 min |
| Aug 10, 8:38 PM PDT | Dust Storm Warning | PSR | Imperial, Riverside | 52 min |
| Aug 10, 9:08 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 6 hr |
| Aug 10, 9:42 PM PDT | Dust Storm Warning | PSR | Imperial | 93 min |
| Aug 10, 11:16 PM PDT | Special Weather Statement | PSR | Imperial | 74 min |
| Aug 11, 2:01 PM PDT | Dust Storm Advisory | PSR | Imperial | 59 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.