Alert archive / California / Flash Flood Warnings in 2020
Flash Flood Warning 13, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 22, 2020, 2:34 PM PDT for San Diego County, California. It was in force for 76 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 22, 2020, 2:34 PM PDT (21:34 UTC)
- Expired
- Aug 22, 2020, 3:50 PM PDT
- In force
- 76 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), 65 km from the middle of the area, began a volume at 21:38 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 78 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
- 29 J/kg
- Mixed-layer CIN
- -704 J/kg
- Mixed-layer LCL
- 1990 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
086
WGUS56 KSGX 222134
FFWSGX
CAC073-230030-
/O.NEW.KSGX.FF.W.0013.200822T2134Z-200823T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
234 PM PDT Sat Aug 22 2020
The National Weather Service in San Diego has issued a
* Flash Flood Warning for...
Southeastern San Diego County in southwestern California...
* Until 530 PM PDT.
* At 232 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Storms were becoming nearly
stationary in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...Radar indicated.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flooding include...
Mount Laguna, I-8 Between Pine Valley And Boulevard, I-8 Between
Boulevard And Imperial County Line, Cuyamaca Rancho State Park,
Pine Valley, Hwy S2 Between Canebrake And Imperial County Line,
Boulevard, Lake Morena, Potrero and Campo.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now. Act quickly to protect your life.
&&
LAT...LON 3290 11623 3263 11623 3263 11657 3291 11657
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JMB2 follow-up statements
767
WGUS76 KSGX 222157
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
257 PM PDT Sat Aug 22 2020
CAC073-230030-
/O.CON.KSGX.FF.W.0013.000000T0000Z-200823T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego CA-
257 PM PDT Sat Aug 22 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM PDT FOR
SOUTHEASTERN SAN DIEGO COUNTY...
At 256 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Flash flooding is ongoing or expected
to begin shortly. Storms are nearly stationary or moving slowly to
the north.
HAZARD...Life threatening flash flooding. Heavy rain producing flash
flooding.
SOURCE...Radar indicated.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flooding include...
Mount Laguna, I-8 Between Pine Valley And Boulevard, I-8 Between
Boulevard And Imperial County Line, Cuyamaca Rancho State Park, Pine
Valley, Hwy S2 Between Canebrake And Imperial County Line, Boulevard,
Lake Morena, Potrero and Campo.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now. Act quickly to protect your life.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3290 11623 3263 11623 3263 11657 3291 11657
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JMB433 WGUS76 KSGX 222250 FFSSGX Flash Flood Statement National Weather Service San Diego CA 350 PM PDT Sat Aug 22 2020 CAC073-222259- /O.CAN.KSGX.FF.W.0013.000000T0000Z-200823T0030Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego CA- 350 PM PDT Sat Aug 22 2020 ...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SAN DIEGO COUNTY IS CANCELLED... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. Flooding was reported on Sunrise Highway just north of Interstate 8. LAT...LON 3290 11623 3263 11623 3263 11657 3291 11657 $$ JMB
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 1:55 PM PDT | Special Weather Statement | SGX | 50 min | |
| Aug 22, 2:21 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 54 min |
| Aug 22, 3:11 PM PDT | Special Weather Statement | SGX | 64 min | |
| Aug 22, 4:13 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 47 min |
| Aug 22, 4:55 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 2 hr |
Nearby
Flash Flood Warnings in California, 2020Every flash flood warning in 2020
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.