Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 17, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Sep 24, 2021, 12:21 PM PDT for San Diego County, California. It was in force for 56 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
- Sep 24, 2021, 12:21 PM PDT (19:21 UTC)
- Expired
- Sep 24, 2021, 1:17 PM PDT
- In force
- 56 min
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County San Diego County, CA
The radar
The San Diego radar (KNKX), 39 km from the middle of the area, began a volume at 19:23 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, 7.4 hours before the alert went out and 52 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
- 1990 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -36 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
308
WGUS56 KSGX 241921
FFWSGX
CAC073-242230-
/O.NEW.KSGX.FF.W.0017.210924T1921Z-210924T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
1221 PM PDT Fri Sep 24 2021
The National Weather Service in San Diego has issued a
* Flash Flood Warning for...
South Central San Diego County in southwestern California...
* Until 330 PM PDT.
* At 1221 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...
Alpine, I-8 Between Pine Valley And Alpine, Descanso, Pine Valley,
Guatay, Viejas Indian Reservation, Japatul Valley, Skye Valley,
Boulder Creek and Captain Grande Indian Reservation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3272 11674 3294 11675 3292 11653 3273 11648
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Maxwell1 follow-up statement
709 WGUS76 KSGX 242017 FFSSGX Flash Flood Statement National Weather Service San Diego CA 117 PM PDT Fri Sep 24 2021 CAC073-242027- /O.CAN.KSGX.FF.W.0017.000000T0000Z-210924T2230Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego CA- 117 PM PDT Fri Sep 24 2021 ...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL SAN DIEGO COUNTY... The heavy rain has ended in south-central San Diego County. Flooding is no longer expected to pose a threat. A Flash Flood Watch remains in effect until 700 PM PDT for a portion of southwest California due to the risk of more thunderstorm development this afternoon. LAT...LON 3272 11674 3294 11675 3292 11653 3273 11648 $$ Maxwell
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 24, 8:56 AM PDT | Flash Flood Watch | SGX | Riverside, San Diego | 10 hr |
| Sep 24, 11:08 AM PDT | Beach Hazards Statement | SGX | Orange, San Diego | 8 hr |
| Sep 24, 12:13 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 31 min |
| Sep 24, 1:24 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 51 min |
| Sep 24, 1:28 PM PDT | Flash Flood Warning | SGX | San Diego | 2 hr |
| Sep 24, 2:09 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Sep 24, 2:41 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 64 min |
| Sep 24, 2:59 PM PDT | Special Weather Statement | SGX | San Diego | 61 min |
| Sep 24, 3:14 PM PDT | Special Marine Warning | SGX | 91 min | |
| Sep 24, 3:20 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 55 min |
| Sep 24, 3:47 PM PDT | Special Weather Statement | SGX | Orange | 58 min |
| Sep 24, 3:56 PM PDT | Special Marine Warning | SGX | 94 min | |
| Sep 24, 4:40 PM PDT | Special Marine Warning | 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.