Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 28, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 21, 2012, 2:08 PM PDT for San Diego County, California. It was in force for 112 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 21, 2012, 2:08 PM PDT (21:08 UTC)
- Expired
- Aug 21, 2012, 4:00 PM PDT
- In force
- 112 min
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
County San Diego County, CA
The radar
The San Diego radar (KNKX), 64 km from the middle of the area, began a volume at 21:10 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 2:15 PM PDT | FLASH FLOOD | 4 Se Ranchita, CA | AT 215 PM PDT BORREGO COUNTY ROAD MAINTENENCE CREW REPORTED WATER AND DEBREE FLOWING ACROSS SAN FELIPE ROAD JUST NORTH OF HIGHWAY 78 BETWEEN MILE MARKER 12 AND 14. |
| Aug 21, 2:50 PM PDT | FLOOD | 9 Ese Ranchita, CA | 2 TO 3 INCHES OF WATER FLOWING ALONG PART OF ROUTE 78 AND S3. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 9.1 hours before the alert went out and 83 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
- 899 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
865
WGUS56 KSGX 212108
FFWSGX
CAC073-212300-
/O.NEW.KSGX.FF.W.0028.120821T2108Z-120821T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
208 PM PDT TUE AUG 21 2012
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EAST CENTRAL SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA...
* UNTIL 400 PM PDT.
* AT 200 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS PRODUCING HEAVY RAIN WHICH WILL LIKELY PRODUCE
FLASH FLOODING FROM A STORM OVER SHELTER VALLEY...HIGHWAY 78
AND THE SAN FELIPE CREEK BASIN. THE STORMS WERE NEARLY STATIONARY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
&&
LAT...LON 3324 11651 3323 11631 3314 11629 3301 11632
3302 11655
$$
HARRISON2 follow-up statements
440
WGUS76 KSGX 212202
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
302 PM PDT TUE AUG 21 2012
CAC073-212300-
/O.CON.KSGX.FF.W.0028.000000T0000Z-120821T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
302 PM PDT TUE AUG 21 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM PDT FOR EAST
CENTRAL SAN DIEGO COUNTY...
SAN DIEGO COUNTY OFFICIALS REPORTED WATER AND DEBRIS FLOWING ACROSS
THE ROAD ON SAN FELIPE ROAD JUST NORTH OF HIGHWAY 78. ALTHOUGH
NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS AND SHOWERS HAVE WEAKENED IN AND AROUND THE SHELTER
VALLEY AREA...RUN-OFF IS LIKELY TO CONTINUE OVER THE NEXT
HOUR...AND SO THE FLASH FLOOD WARNING CONTINUES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.
&&
LAT...LON 3324 11651 3323 11631 3314 11629 3301 11632
3302 11655
$$
HARRISON913
WGUS76 KSGX 212255
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
355 PM PDT TUE AUG 21 2012
CAC073-212302-
/O.EXP.KSGX.FF.W.0028.000000T0000Z-120821T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
355 PM PDT TUE AUG 21 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM PDT FOR EAST CENTRAL
SAN DIEGO COUNTY...
HEAVY RAINFALL FROM SHOWERS AND THUNDERSTORMS OVER AND AROUND THE
SHELTER VALLEY AREA HAS DISSIPATED...SO THE FLASH FLOOD WARNING
WILL BE ALLOWED TO EXPIRE AT 4 PM. SOME RUN-OFF MAY CONTINUE THROUGH
THE SAN FELIPE CREEK BASIN OVER THE NEXT COUPLE HOURS.
LAT...LON 3324 11651 3323 11631 3314 11629 3301 11632
3302 11655
$$
HARRISONThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 7:39 AM PDT | Flood Watch | SGX | Riverside, San Bernardino, San Diego | 88 min |
| Aug 21, 9:07 AM PDT | Flash Flood Watch | SGX | Riverside, San Bernardino, San Diego | 11 hr |
| Aug 21, 1:50 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 40 min |
| Aug 21, 2:47 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 28 min |
| Aug 21, 3:10 PM PDT | Areal Flood Advisory | SGX | Riverside, San Diego | 2 hr |
| Aug 21, 3:12 PM PDT | Areal Flood Advisory | SGX | San Diego | 2 hr |
| Aug 21, 3:15 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 35 min |
Nearby
Flash Flood Warnings in California, 2012Every flash flood warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.