Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 228, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 29, 2021, 4:29 PM PDT for Riverside County, San Bernardino 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
- Aug 29, 2021, 4:29 PM PDT (23:29 UTC)
- Expired
- Aug 29, 2021, 7:18 PM PDT
- In force
- 3 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
The radar
The San Diego radar (KNKX), 158 km from the middle of the area, began a volume at 23:30 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, 11.5 hours before the alert went out and 178 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
- 2595 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
405
WGUS55 KPSR 292329
FFWPSR
CAC065-071-300330-
/O.NEW.KPSR.FF.W.0228.210829T2329Z-210830T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
429 PM PDT Sun Aug 29 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Riverside County in southern California...
San Bernardino County in southern California...
* Until 830 PM PDT.
* At 429 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across 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 Riverside and San Bernardino Counties
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3407 11610 3408 11600 3403 11600 3404 11563
3394 11563 3383 11575 3386 11593 3394 11606
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
INS2 follow-up statements
932
WGUS75 KPSR 300018
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
518 PM PDT Sun Aug 29 2021
CAC065-071-300330-
/O.CON.KPSR.FF.W.0228.000000T0000Z-210830T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-San Bernardino CA-
518 PM PDT Sun Aug 29 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM PDT THIS
EVENING FOR RIVERSIDE AND SAN BERNARDINO COUNTIES...
At 518 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Up to 2 inches of rain have fallen.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
mainly rural areas of Riverside and San Bernardino Counties
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3407 11610 3408 11600 3403 11600 3404 11563
3394 11563 3383 11575 3386 11593 3394 11606
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
INS483
WGUS75 KPSR 300218
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
718 PM PDT Sun Aug 29 2021
CAC065-071-300228-
/O.CAN.KPSR.FF.W.0228.000000T0000Z-210830T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-San Bernardino CA-
718 PM PDT Sun Aug 29 2021
...FLASH FLOOD WARNING IS CANCELLED FOR RIVERSIDE AND SAN BERNARDINO
COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3407 11610 3408 11600 3403 11600 3404 11563
3394 11563 3383 11575 3386 11593 3394 11606
$$
INSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 1:14 PM PDT | Special Weather Statement | PSR | Riverside | 31 min |
| Aug 29, 3:30 PM PDT | Special Weather Statement | PSR | Riverside | 30 min |
| Aug 29, 4:01 PM PDT | Special Weather Statement | PSR | Riverside | 29 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.