Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 20, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 27, 2011, 2:24 PM PDT for San Bernardino County, California. It was in force for 2 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 27, 2011, 2:24 PM PDT (21:24 UTC)
- Expired
- Aug 27, 2011, 4:30 PM PDT
- In force
- 2 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 9.4 hours before the alert went out and 198 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
- 46 J/kg
- Mixed-layer CIN
- -838 J/kg
- Mixed-layer LCL
- 2203 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
713
WGUS56 KSGX 272124
FFWSGX
CAC071-272330-
/O.NEW.KSGX.FF.W.0020.110827T2124Z-110827T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
224 PM PDT SAT AUG 27 2011
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
WEST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
THIS INCLUDES THE CITIES OF...VICTORVILLE...HESPERIA...APPLE
VALLEY...
* UNTIL 430 PM PDT
* AT 218 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SEVERAL STRONG THUNDERSTORMS PRODUCING HEAVY RAIN. THESE STORMS WERE
DEVELOPING IN ALL AREAS OF THE UPPER DESERTS.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GEORGE AFB
AND ADELANTO
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.
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.
&&
LAT...LON 3473 11646 3470 11646 3467 11651 3461 11651
3460 11647 3456 11646 3433 11645 3431 11648
3422 11645 3444 11712 3439 11730 3449 11764
3482 11763
$$
WHITLOW2 follow-up statements
155
WGUS76 KSGX 272224
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
324 PM PDT SAT AUG 27 2011
CAC071-272330-
/O.CON.KSGX.FF.W.0020.000000T0000Z-110827T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
324 PM PDT SAT AUG 27 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM PDT FOR WEST
CENTRAL SAN BERNARDINO COUNTY...
AT 312 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE HEAVY RAIN PRODUCING FLASH FLOODING OVER THE WARNED AREA.
MOST OF THE THUNDERSTORMS HAVE MOVED NORTH EXCEPT A FEW STRONG
STORMS CONTINUE IN THE WEST AND EAST PARTS WITH HEAVY RAIN. DUE TO
STRONG THUNDERSTORMS ARE EXPECTED TO CONTINUE TO DEVELOP AND RUNOFF
FROM THE PREVIOUS THUNDERSTORMS MAY AFFECT ROADS THAT CROSS WASHES
AND GULLIES FOR ANOTHER HOUR...THE FLASH FLOOD WARNING CONTINUES.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GEORGE AFB...
APPLE VALLEY AND ADELANTO
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
&&
LAT...LON 3473 11646 3470 11646 3467 11651 3461 11651
3460 11647 3456 11646 3433 11645 3431 11648
3422 11645 3444 11712 3439 11730 3449 11764
3482 11763
$$
WHITLOW437
WGUS76 KSGX 272325
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
425 PM PDT SAT AUG 27 2011
CAC071-272333-
/O.EXP.KSGX.FF.W.0020.000000T0000Z-110827T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
425 PM PDT SAT AUG 27 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 430 PM PDT FOR WEST CENTRAL
SAN BERNARDINO COUNTY...
THUNDERSTORMS HAVE DISSIPATED. A FEW THUNDERSTORMS WERE STILL
DEVELOPING IN THE WEST PART. ANY MORE THUNDERSTORMS MAY HAVE BRIEF
HEAVY RAIN...BUT FLASH FLOODING IS NO LONGER EXPECTED.
LAT...LON 3473 11646 3470 11646 3467 11651 3461 11651
3460 11647 3456 11646 3433 11645 3431 11648
3422 11645 3444 11712 3439 11730 3449 11764
3482 11763
$$
SGXThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 12:30 PM PDT | Special Weather Statement | SGX | 60 min | |
| Aug 27, 12:49 PM PDT | Flash Flood Warning | SGX | San Bernardino | 86 min |
| Aug 27, 1:37 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 30 min |
| Aug 27, 2:28 PM PDT | Flash Flood Warning | SGX | Riverside, San Diego | 92 min |
Nearby
Flash Flood Warnings in California, 2011Every flash flood warning in 2011
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.