Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 89, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 25, 2021, 2:34 PM PDT for Riverside County, California. It was in force for 7 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 25, 2021, 2:34 PM PDT (21:34 UTC)
- Expired
- Jul 25, 2021, 9:45 PM PDT
- In force
- 7 hr
- 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), 152 km from the middle of the area, began a volume at 21:36 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, 9.6 hours before the alert went out and 175 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
- 1039 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
852
WGUS55 KPSR 252134
FFWPSR
CAC065-260145-
/O.NEW.KPSR.FF.W.0089.210725T2134Z-210726T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
234 PM PDT Sun Jul 25 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Riverside County in southern California...
* Until 645 PM PDT.
* At 234 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 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...
mainly rural areas of Riverside County
This includes the following highways...
CA Interstate 10 between mile markers 88 and 97.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3370 11574 3375 11556 3369 11550 3364 11546
3358 11533 3353 11537 3350 11550 3349 11572
3358 11575 3361 11575 3364 11568
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MS3 follow-up statements
045
WGUS75 KPSR 260118
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
618 PM PDT Sun Jul 25 2021
CAC065-260145-
/O.CON.KPSR.FF.W.0089.000000T0000Z-210726T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
618 PM PDT Sun Jul 25 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM PDT THIS
EVENING FOR RIVERSIDE COUNTY...
At 618 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 0.5 and 1.5 inches of rain have
fallen. Additional thunderstorms are moving into the warned area
which may produce additional rainfall amounts up to 1.5 inches.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
mainly rural areas of Riverside County
This includes the following highways...
CA Interstate 10 between mile markers 88 and 97.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3370 11574 3375 11556 3369 11550 3364 11546
3358 11533 3353 11537 3350 11550 3349 11572
3358 11575 3361 11575 3364 11568
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Iniguez769
WGUS55 KPSR 260138
FFWPSR
CAC065-260445-
/O.EXT.KPSR.FF.W.0089.000000T0000Z-210726T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
638 PM PDT Sun Jul 25 2021
The National Weather Service in Phoenix has extended the
* Flash Flood Warning for...
Riverside County in southern California...
* Until 945 PM PDT.
* At 638 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1.5 inches of
rain have fallen. Additional rainfall amounts up to 1.5 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...
mainly rural areas of Riverside County
This includes the following highways...
CA Interstate 10 between mile markers 88 and 97.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3370 11574 3375 11556 3369 11550 3364 11546
3358 11533 3353 11537 3350 11550 3349 11572
3358 11575 3361 11575 3364 11568
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Iniguez156
WGUS75 KPSR 260441
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
941 PM PDT Sun Jul 25 2021
CAC065-260451-
/O.EXP.KPSR.FF.W.0089.000000T0000Z-210726T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
941 PM PDT Sun Jul 25 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 945 PM PDT THIS EVENING FOR
RIVERSIDE COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3370 11574 3375 11556 3369 11550 3364 11546
3358 11533 3353 11537 3350 11550 3349 11572
3358 11575 3361 11575 3364 11568
$$
IniguezThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 11:59 AM PDT | Special Weather Statement | PSR | Riverside | 31 min |
| Jul 25, 12:14 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Jul 25, 12:43 PM PDT | Special Weather Statement | PSR | Riverside | 32 min |
| Jul 25, 1:12 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Jul 25, 1:24 PM PDT | Special Weather Statement | PSR | Riverside | 51 min |
| Jul 25, 2:15 PM PDT | Special Weather Statement | PSR | Riverside | 45 min |
| Jul 25, 2:38 PM PDT | Special Weather Statement | PSR | Riverside | 37 min |
| Jul 25, 3:14 PM PDT | Special Weather Statement | PSR | Riverside | 31 min |
| Jul 25, 3:20 PM PDT | Flash Flood Warning | PSR | Riverside | 5 hr |
| Jul 25, 3:41 PM PDT | Special Weather Statement | PSR | Riverside | 34 min |
| Jul 25, 4:01 PM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 29 min |
| Jul 25, 4:18 PM PDT | Flash Flood Warning | PSR | Riverside | 4 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.