Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 5, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Jul 25, 2021, 3:23 PM PDT for San Diego County, California. It was in force for 112 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
- Jul 25, 2021, 3:23 PM PDT (22:23 UTC)
- Expired
- Jul 25, 2021, 5:15 PM PDT
- In force
- 112 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 22:27 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, 10.4 hours before the alert went out and 57 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.
035
WGUS56 KSGX 252223
FFWSGX
CAC073-260015-
/O.NEW.KSGX.FF.W.0005.210725T2223Z-210726T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
323 PM PDT Sun Jul 25 2021
The National Weather Service in San Diego has issued a
* Flash Flood Warning for...
Central San Diego County in southwestern California...
* Until 515 PM PDT.
* At 323 PM PDT, Doppler radar and automated rain gauges 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 and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Cuyamaca Rancho State Park, Lake Cuyamaca, Hwy 79 Between Julian
And Lake Cuyamaca, Descanso, Hwy S1 Between Lake Cuyamaca And
Mount Laguna, 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.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain.
Arroyos, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3304 11658 3297 11652 3292 11669 3299 11674
3301 11670
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CO3 follow-up statements
283
WGUS76 KSGX 252255
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
355 PM PDT Sun Jul 25 2021
CAC073-260015-
/O.CON.KSGX.FF.W.0005.000000T0000Z-210726T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego CA-
355 PM PDT Sun Jul 25 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM PDT THIS
AFTERNOON FOR CENTRAL SAN DIEGO COUNTY...
At 355 PM PDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 1
and 2 inches of rain have fallen. Additional rainfall amounts of
0.25 to 0.5 inches are possible in the warned area. Flash flooding
is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Cuyamaca Rancho State Park, Lake Cuyamaca, Hwy 79 Between Julian
And Lake Cuyamaca, Descanso, Hwy S1 Between Lake Cuyamaca And
Mount Laguna, Boulder Creek and Captain Grande Indian Reservation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain.
Arroyos, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3304 11658 3297 11652 3292 11669 3299 11674
3301 11670
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CO255
WGUS76 KSGX 252323
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
423 PM PDT Sun Jul 25 2021
CAC073-260015-
/O.CON.KSGX.FF.W.0005.000000T0000Z-210726T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego CA-
423 PM PDT Sun Jul 25 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM PDT THIS
AFTERNOON FOR CENTRAL SAN DIEGO COUNTY...
At 423 PM PDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 1
to 3 inches of rain have fallen. Additional rainfall amounts of 0.25
to 0.5 inches are likely in the warned area. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Cuyamaca Rancho State Park, Lake Cuyamaca, Hwy 79 Between Julian
And Lake Cuyamaca, Descanso, Hwy S1 Between Lake Cuyamaca And
Mount Laguna, 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.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain.
Arroyos, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3304 11658 3297 11652 3292 11669 3299 11674
3301 11670
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Brotherton835
WGUS76 KSGX 260014
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
514 PM PDT Sun Jul 25 2021
CAC073-260024-
/O.EXP.KSGX.FF.W.0005.000000T0000Z-210726T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego CA-
514 PM PDT Sun Jul 25 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 515 PM PDT THIS AFTERNOON FOR
CENTRAL SAN DIEGO COUNTY...
The heavy rain has ended. Additional heavy rain could move into the
area in the next hour so remain alert to evolving weather conditions.
LAT...LON 3304 11658 3297 11652 3292 11669 3299 11674
3301 11670
$$
BrothertonThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 3:08 PM PDT | Areal Flood Advisory | SGX | San Diego | 15 min |
| Jul 25, 4:14 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 36 min |
| Jul 25, 4:32 PM PDT | Areal Flood Advisory | SGX | San Diego | 77 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.