Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 12, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 11, 2012, 1:23 PM PDT for San Bernardino County, California. It was in force for 3 hr. 1 report 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 11, 2012, 1:23 PM PDT (20:23 UTC)
- Expired
- Aug 11, 2012, 4:15 PM PDT
- In force
- 3 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
The radar
The Santa Ana Mts radar (KSOX), 72 km from the middle of the area, began a volume at 20:27 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 11, 1:35 PM PDT | FLASH FLOOD | Big Bear City, CA | SPOTTER HEARD ON HAM RADIO...CAL TRANS AND CHP HAVE CLOSED HIGHWAY 38 AT MILE MARKER 19 DUE TO A STREAM OF WATER RUSHING DOWN THE ROAD WITH EMBEDDED BOULDERS. |
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, 8.4 hours before the alert went out and 162 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
- 268 J/kg
- Mixed-layer CIN
- -713 J/kg
- Mixed-layer LCL
- 1560 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
891
WGUS56 KSGX 112023
FFWSGX
CAC071-112315-
/O.NEW.KSGX.FF.W.0012.120811T2023Z-120811T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
123 PM PDT SAT AUG 11 2012
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHWESTERN SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...THIS
INCLUDES THE CITIES OF HESPERIA...GREEN VALLEY LAKE...AND FOREST
FALLS.
* UNTIL 415 PM PDT
* AT 112 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
FLASH FLOODING FROM SEVERAL STORMS OVER THE WARNED AREA.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RUNNING
SPRINGS...LAKE ARROWHEAD...CRESTLINE...BIG BEAR LAKE...BIG BEAR
CITY...GREEN VALLEY LAKE...FOREST FALLS AND HESPERIA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DEBRIS FLOWS...INCLUDING MUD AND ROCK SLIDES...ARE POSSIBLE WITH
THESE STORMS. MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND
KILL PEOPLE CAUGHT IN THEIR PATH.
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 3409 11718 3426 11745 3434 11744 3442 11737
3451 11730 3449 11701 3443 11687 3435 11670
3418 11664 3406 11680 3406 11691 3402 11698
$$
TS2 follow-up statements
798
WGUS76 KSGX 112136
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
236 PM PDT SAT AUG 11 2012
CAC071-112315-
/O.CON.KSGX.FF.W.0012.000000T0000Z-120811T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
236 PM PDT SAT AUG 11 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT FOR
SOUTHWESTERN SAN BERNARDINO COUNTY...
AT 227 PM PDT...TRAINED SPOTTERS REPORTED HEAVY RAIN CAPABLE OF
PRODUCING FLASH FLOODING OVER THE WARNED AREA.
* LOCATIONS IMPACTED INCLUDE FOREST FALLS.
* A GAGE AT YUCAIPA RIDGE RECORDED EIGHT TENTHS OF AN INCH OF RAIN
WITHIN ONE HALF HOUR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
&&
LAT...LON 3409 11718 3426 11745 3434 11744 3442 11737
3451 11730 3449 11701 3443 11687 3435 11670
3418 11664 3406 11680 3406 11691 3402 11698
$$
TS/JJT838
WGUS76 KSGX 112310
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
410 PM PDT SAT AUG 11 2012
CAC071-112317-
/O.EXP.KSGX.FF.W.0012.000000T0000Z-120811T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
410 PM PDT SAT AUG 11 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 415 PM PDT FOR SOUTHWESTERN
SAN BERNARDINO COUNTY...INCLUDING THE AREAS OF FOREST FALLS AND BIG
BEAR CITY.
STORMS IN THE WARNED AREA HAVE DISSIPATED TO THE POINT THAT MAJOR
FLOODING IS NO LONGER A CONCERN. MINOR RUNOFF AND SOME PONDING ON
ROADWAYS WILL STILL BE POSSIBLE FOR A FEW HOURS.
LAT...LON 3409 11718 3426 11745 3434 11744 3442 11737
3451 11730 3449 11701 3443 11687 3435 11670
3418 11664 3406 11680 3406 11691 3402 11698
$$
TS/JJTThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 5:20 PM PDT | Areal Flood Advisory | SGX | Riverside | 115 min |
| Aug 11, 12:00 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 92 min |
| Aug 11, 12:58 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 2 hr |
| Aug 11, 1:58 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 3 hr |
| Aug 11, 2:03 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 27 min |
| Aug 11, 2:23 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 22 min |
| Aug 11, 2:46 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 44 min |
| Aug 11, 3:05 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Diego | 40 min |
| Aug 11, 3:22 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 113 min |
| Aug 11, 3:33 PM PDT | Severe Thunderstorm Warning | SGX | Orange, Riverside | 42 min |
| Aug 11, 4:40 PM PDT | Areal Flood Advisory | SGX | San Diego | 3 hr |
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.