Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 11, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 30, 2021, 8:18 PM PDT for Riverside County, California. It was in force for 37 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 30, 2021, 8:18 PM PDT (03:18 UTC)
- Expired
- Aug 30, 2021, 8:55 PM PDT
- In force
- 37 min
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Riverside County, CA
The radar
The San Diego radar (KNKX), 116 km from the middle of the area, began a volume at 03:20 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, 3.3 hours before the alert went out and 136 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
- 1693 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
880
WGUS56 KSGX 310318
FFWSGX
CAC065-310630-
/O.NEW.KSGX.FF.W.0011.210831T0318Z-210831T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
818 PM PDT Mon Aug 30 2021
The National Weather Service in San Diego has issued a
* Flash Flood Warning for...
Riverside County in southern California...
* Until 1130 PM PDT.
* At 818 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has 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...
Coachella, Thermal and Mecca.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3350 11607 3350 11608 3370 11610 3371 11595
3352 11595 3351 11598 3352 11599 3352 11600
3352 11602 3352 11603 3352 11605 3352 11606
3351 11605 3351 11606 3351 11607
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SS1 follow-up statement
711
WGUS76 KSGX 310355
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
855 PM PDT Mon Aug 30 2021
CAC065-310405-
/O.CAN.KSGX.FF.W.0011.000000T0000Z-210831T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
855 PM PDT Mon Aug 30 2021
...FLASH FLOOD WARNING IS CANCELLED FOR RIVERSIDE COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3350 11607 3350 11608 3370 11610 3371 11595
3352 11595 3351 11598 3352 11599 3352 11600
3352 11602 3352 11603 3352 11605 3352 11606
3351 11605 3351 11606 3351 11607
$$
SSThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 7:58 PM PDT | Special Weather Statement | SGX | Riverside | 47 min |
| Aug 31, 3:30 PM PDT | Special Weather Statement | SGX | San Diego | 45 min |
| Aug 31, 4:13 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 62 min |
| Aug 31, 4:55 PM PDT | Special Weather Statement | SGX | 65 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.