Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 34, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 30, 2012, 1:05 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 30, 2012, 1:05 PM PDT (20:05 UTC)
- Expired
- Aug 30, 2012, 4:00 PM PDT
- In force
- 3 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 30, 2:40 PM PDT | FLOOD | Lucerne Valley, CA | DRIVING INTO LUCERNE VALLEY FROM BARSTOW, SPOTTER SBD342 REPORTED STRONG WINDS AND PLENTY OF LIGHTNING. 1 TO 2 INCHES OF STANDING WATER ALONG HIGHWAY 47 ON THE NORTH SIDE OF TOWN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Edwards AFB, CA (KEDW), launched 12:00Z, 8.1 hours before the alert went out and 92 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
- 2894 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -36 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
767 WGUS56 KSGX 302005 FFWSGX CAC071-302300- /O.NEW.KSGX.FF.W.0034.120830T2005Z-120830T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN DIEGO CA 105 PM PDT THU AUG 30 2012 THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA... * UNTIL 400 PM PDT * AT 1254 PM PDT...THUNDERSTORMS WITH VERY HEAVY RAINS COVERED AREAS FROM THE NORTH SLOPES OF THE SAN BERNARDINO MOUNTAINS NORTH THROUGH LUCERNE VALLEY AND INTO THE HIGH DESERTS. RAIN RATES ARE EXCEEDING ONE INCH PER HOUR IN SOME AREAS. * THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. 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 3471 11705 3470 11662 3425 11668 3429 11707 $$ MAXWELL
3 follow-up statements
559 WGUS76 KSGX 302043 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 143 PM PDT THU AUG 30 2012 CAC071-302300- /O.CON.KSGX.FF.W.0034.000000T0000Z-120830T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 143 PM PDT THU AUG 30 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM PDT FOR CENTRAL SAN BERNARDINO COUNTY... AT 136 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED VERY HEAVY RAIN ALONG HIGHWAY 247 BETWEEN LUCERNE VALLEY AND BARSTOW. THE HEAVY RAIN WAS MOVING SLOWLY NORTHWEST AND WILL LIKELY PRODUCE FLASH FLOODING ALONG PARTS OF HIGHWAY 247 NORTH OF LUCERNE VALLEY. RAINFALL HAD BECOME LESS HEAVY ALONG HIGHWAY 247 SOUTH OF LUCERNE VALLEY...BUT RUNOFF FROM PREVIOUS HEAVY RAIN WILL CONTINUE THROUGH 230 PM...AND WATER COULD COVER SOME ROADWAYS IN THIS AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. && LAT...LON 3471 11705 3470 11662 3425 11668 3429 11707 $$ MAXWELL
630 WGUS76 KSGX 302201 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 301 PM PDT THU AUG 30 2012 CAC071-302300- /O.CON.KSGX.FF.W.0034.000000T0000Z-120830T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 301 PM PDT THU AUG 30 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM PDT FOR CENTRAL SAN BERNARDINO COUNTY... AT 254 PM PDT...DOPPLER RADAR INDICATES THE STORMS OVER LUCERNE VALLEY HAVE WEAKENED SIGNIFICANTLY. HOWEVER...ADDITIONAL RUNOFF FROM LIGHT TO MODERATE RAIN WILL CONTINUE THE THREAT OF FLASH FLOODING. 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. IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY. && LAT...LON 3471 11705 3470 11662 3425 11668 3429 11707 $$ SS
937 WGUS76 KSGX 302255 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 355 PM PDT THU AUG 30 2012 CAC071-302305- /O.EXP.KSGX.FF.W.0034.000000T0000Z-120830T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 355 PM PDT THU AUG 30 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM PDT FOR CENTRAL SAN BERNARDINO COUNTY... LIGHT RAINFALL IN THE AREA MAY CAUSE ADDITIONAL MINOR RUNOFF...HOWEVER THE FLASH FLOOD THREAT HAS ENDED. THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 400 PM. LAT...LON 3471 11705 3470 11662 3425 11668 3429 11707 $$ SS
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 8:47 PM PDT | High Surf Advisory | SGX | San Diego | 4 days |
| Aug 30, 3:18 AM PDT | Flash Flood Watch | SGX | Riverside, San Bernardino, San Diego | 16 hr |
| Aug 30, 11:57 AM PDT | Flash Flood Warning | SGX | Riverside, San Bernardino | 2 hr |
| Aug 30, 12:04 PM PDT | Areal Flood Advisory | SGX | San Diego | 116 min |
| Aug 30, 12:11 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Aug 30, 12:11 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 34 min |
| Aug 30, 12:18 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 57 min |
| Aug 30, 12:45 PM PDT | Flash Flood Warning | SGX | Riverside | 3 hr |
| Aug 30, 12:50 PM PDT | Special Weather Statement | SGX | San Diego | 55 min |
| Aug 30, 1:30 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino, San Diego | 3 hr |
| Aug 30, 1:52 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Bernardino | 53 min |
| Aug 30, 1:58 PM PDT | Flash Flood Warning | SGX | San Bernardino | 2 hr |
| Aug 30, 2:31 PM PDT | Flash Flood Warning | SGX | Riverside | 119 min |
| Aug 30, 2:38 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 40 min |
| Aug 30, 2:45 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 60 min |
| Aug 30, 3:10 PM PDT | Flash Flood Warning | SGX | San Bernardino | 2 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.