Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 10, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Jul 31, 2011, 12:31 PM PDT for San Diego County, California. It was in force for 119 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
- Jul 31, 2011, 12:31 PM PDT (19:31 UTC)
- Expired
- Jul 31, 2011, 2:30 PM PDT
- In force
- 119 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), 55 km from the middle of the area, began a volume at 19:33 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, 7.5 hours before the alert went out and 69 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
- 772 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
041 WGUS56 KSGX 311931 FFWSGX CAC073-312130- /O.NEW.KSGX.FF.W.0010.110731T1931Z-110731T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN DIEGO CA 1231 PM PDT SUN JUL 31 2011 THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A * FLASH FLOOD WARNING FOR... EAST CENTRAL SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA... * UNTIL 230 PM PDT * AT 1218 PM PDT...FLASH FLOODING WILL OCCUR FROM PERSISTENT THUNDERSTORMS WITH VERY HEAVY RAIN. RAINFALL UP TO 3 INCHES IN EXPECTED IN THE STRONGEST STORMS. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MOUNT LAGUNA AND PINE VALLEY...AS WELL AS NEAR I-8. CAMPGROUNDS AND STATE PARKS NEAR ANY DRY CREEKS SHOULD MOVE TO HIGHER GROUND AND MONITOR WEATHER CONDITIONS. IF OUTDOORS BE ALERT FOR RAPID RISING WATER IN ANY STREAM OR CREEK... EVEN IF DISTANT FROM THE THUNDERSTORMS. LAT...LON 3299 11665 3302 11636 3261 11623 3259 11642 $$ TARDY
2 follow-up statements
699 WGUS76 KSGX 312015 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 115 PM PDT SUN JUL 31 2011 CAC073-312130- /O.CON.KSGX.FF.W.0010.000000T0000Z-110731T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN DIEGO CA- 115 PM PDT SUN JUL 31 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM PDT FOR EAST CENTRAL SAN DIEGO COUNTY... AT 106 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE HEAVY RAIN PRODUCING FLASH FLOODING OVER THE WARNED AREA. TWO INTENSE THUNDERSTORMS...ONE NEAR LIVE OAK SPRINGS AND ANOTHER JUST EAST OF CUYAMACA PEAK CONTINUE TO PRODUCE TORRENTIAL RAIN. RADAR ESTIMATES ARE NEAR 3 INCHES ALONG I-8 IN LIVE OAK SPRINGS. THIS CAN BRING RAPID AND DEVASTATING FLASH FLOODS TO NORMALLY DRY CREEKS. AREAS AFFECTED INCLUDED DIABOLD CANYON. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MOUNT LAGUNA AND PINE VALLEY PRECAUTIONARY/PREPAREDNESS ACTIONS... ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE WARNED AREA. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR CREEKS. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 3299 11665 3302 11636 3261 11623 3259 11642 $$ TARDY
611 WGUS76 KSGX 312132 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 232 PM PDT SUN JUL 31 2011 CAC073-312140- /O.EXP.KSGX.FF.W.0010.000000T0000Z-110731T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN DIEGO CA- 232 PM PDT SUN JUL 31 2011 ...THE FLASH FLOOD WARNING HAS EXPIRED FOR EAST CENTRAL SAN DIEGO COUNTY... THE TORRENTIAL RAIN FROM THUNDERSTORMS HAS ENDED OVER THE WARNED AREA FROM MOUNT LAGUNA TO I-8. CREEKS WILL CONTINUE TO RUN HIGH THROUGH THE AFTERNOON. RADAR ESTIMATES OF UP TO 3 INCHES OCCURRED AT LIVE OAK SPRINGS. HEAVY RAINS CONTINUE TO EXPAND IN NORTHEAST SAN DIEGO COUNTY MOUNTAINS FROM PALOMAR MOUNTAIN TO SAN JACINTO PEAK. LAT...LON 3299 11665 3302 11636 3261 11623 3259 11642 $$ TARDY
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 5:19 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 3 hr |
| Jul 30, 8:50 PM PDT | Flash Flood Watch | SGX | Riverside, San Bernardino, San Diego | 21 hr |
| Jul 31, 7:56 AM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 3 hr |
| Jul 31, 11:02 AM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 118 min |
| Jul 31, 12:07 PM PDT | Special Weather Statement | SGX | San Diego | 53 min |
| Jul 31, 12:34 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 56 min |
| Jul 31, 1:30 PM PDT | Flash Flood Warning | SGX | San Diego | 2 hr |
| Jul 31, 3:26 PM PDT | Special Weather Statement | SGX | San Diego | 64 min |
| Jul 31, 3:33 PM PDT | Flash Flood Warning | SGX | San Diego | 117 min |
| Jul 31, 3:52 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 38 min |
| Jul 31, 3:59 PM PDT | Flash Flood Warning | SGX | San Bernardino | 100 min |
| Jul 31, 4:20 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 40 min |
| Jul 31, 4:37 PM PDT | Flash Flood Warning | SGX | San Diego | 113 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; radar from the NEXRAD Level II archive.