Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 10, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 29, 2021, 1:18 PM PDT for Riverside County, San Diego 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, 1:18 PM PDT (20:18 UTC)
- Expired
- Aug 29, 2021, 4:30 PM PDT
- In force
- 3 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Riverside County, CA, San Diego County, CA
The radar
The San Diego radar (KNKX), 55 km from the middle of the area, began a volume at 20:20 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 12:00Z, 8.3 hours before the alert went out and 74 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.
913
WGUS56 KSGX 292018
FFWSGX
CAC065-073-292330-
/O.NEW.KSGX.FF.W.0010.210829T2018Z-210829T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
118 PM PDT Sun Aug 29 2021
The National Weather Service in San Diego has issued a
* Flash Flood Warning for...
Riverside County in southern California...
North Central San Diego County in southwestern California...
* Until 430 PM PDT.
* At 118 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.75 and 1.5 inches of
rain have fallen. The expected rainfall rate is 0.5 to 0.75 inches
in 1 hour. Additional rainfall amounts of 0.5 to 1 inch are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly. Temecula and Bear Creeks have received the most
rainfall.
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...
Hwy 79 Between Warner Springs And Oak Grove, Hwy 79 Between Oak
Grove And Aguanga, S7 - East Grade Rd, Palomar Mountain, Lake
Henshaw, Warner Springs, Hwy 79 Between Santa Ysabel And Warner
Springs, Aguanga, Oak Grove, La Jolla Indian Reservation and Los
Coyotes Indian Reservation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3348 11690 3346 11675 3345 11674 3344 11670
3340 11667 3336 11662 3331 11660 3328 11659
3327 11661 3324 11677 3324 11679 3327 11684
3329 11687 3333 11688 3336 11690 3342 11691
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.5-0.75 INCHES IN 1 HOUR
$$
Tardy1 follow-up statement
425
WGUS76 KSGX 292326
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
426 PM PDT Sun Aug 29 2021
CAC065-073-292336-
/O.EXP.KSGX.FF.W.0010.000000T0000Z-210829T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-San Diego CA-
426 PM PDT Sun Aug 29 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 430 PM PDT THIS AFTERNOON FOR
RIVERSIDE AND NORTH CENTRAL SAN DIEGO COUNTIES...
Flood waters have receded in Temecula Creek on the northeast side of
Palomar Mountain. The heavy rain has ended. Flooding is no longer
expected to pose a threat. Please continue to heed remaining road
closures. Low lying areas may still have standing water.
LAT...LON 3348 11690 3346 11675 3345 11674 3344 11670
3340 11667 3336 11662 3331 11660 3328 11659
3327 11661 3324 11677 3324 11679 3327 11684
3329 11687 3333 11688 3336 11690 3342 11691
$$
TardyThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 12:49 PM PDT | Areal Flood Advisory | SGX | Riverside | 3 hr |
| Aug 29, 12:54 PM PDT | Special Weather Statement | SGX | San Diego | 51 min |
| Aug 29, 2:35 PM PDT | Special Weather Statement | SGX | San Diego | 40 min |
| Aug 29, 3:51 PM PDT | Areal Flood Advisory | SGX | San Diego | 114 min |
| Aug 29, 4:24 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 3 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.