Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 13, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 12, 2012, 2:55 PM PDT for San Diego 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 12, 2012, 2:55 PM PDT (21:55 UTC)
- Expired
- Aug 12, 2012, 5:11 PM PDT
- In force
- 2 hr
- 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), 50 km from the middle of the area, began a volume at 21:56 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, 9.9 hours before the alert went out and 70 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
- 552 J/kg
- Mixed-layer CIN
- -580 J/kg
- Mixed-layer LCL
- 1680 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
261 WGUS56 KSGX 122155 FFWSGX CAC073-130045- /O.NEW.KSGX.FF.W.0013.120812T2155Z-120813T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN DIEGO CA 255 PM PDT SUN AUG 12 2012 THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTH CENTRAL SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA... * UNTIL 545 PM PDT * AT 242 PM PDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH FLOODING FROM A STORM OVER THE WARNED AREA. FLOODING...THREE FEET OF WATER...HAS BEEN REPORTED ON ROUTE 79 AND SAN FELIPE ROAD SOUTH OF WARNER SPRINGS. MONTEZUMA VALLEY ROAD WILL BE IMPACTED AS WELL AS THE BUENA VISTA CREEK. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WARNER SPRINGS 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 3334 11682 3333 11652 3316 11652 3316 11681 $$ JT/JTT
2 follow-up statements
242 WGUS76 KSGX 122246 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 346 PM PDT SUN AUG 12 2012 CAC073-130045- /O.CON.KSGX.FF.W.0013.000000T0000Z-120813T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN DIEGO CA- 346 PM PDT SUN AUG 12 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM PDT FOR NORTH CENTRAL SAN DIEGO COUNTY... AT 339 PM PDT...THUNDERSTORMS OVER THE WARNED AREA HAVE DISSIPATED. HOWEVER...FLASH FLOODING IS STILL POSSIBLE DOWNSTREAM OF AREAS WHICH RECEIVED HEAVY RAINFALL. LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THREE FEET OF WATER AND MUD ON ROUTE 79 AND SAN FELIPE ROAD SOUTH OF WARNER SPRINGS AROUND 232 PM PDT. MONTEZUMA VALLEY ROAD IS EXPECTED TO BE IMPACTED...AS WELL AS THE BUENA VISTA CREEK. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WARNER SPRINGS...AND LAKE HENSHAW. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SAN DIEGO. && LAT...LON 3334 11682 3333 11652 3316 11652 3316 11681 $$ JJT/JT
284 WGUS76 KSGX 130011 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 511 PM PDT SUN AUG 12 2012 CAC073-130017- /O.CAN.KSGX.FF.W.0013.000000T0000Z-120813T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN DIEGO CA- 511 PM PDT SUN AUG 12 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTH CENTRAL SAN DIEGO COUNTY... FLOODING IS NO LONGER EXPECTED FOR THE WARNED AREA. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTH CENTRAL SAN DIEGO COUNTY. MINIMAL ADDITIONAL RAINFALL IS EXPECTED OVER THE NEXT FEW HOURS. LAT...LON 3334 11682 3333 11652 3316 11652 3316 11681 $$ JJT/JT
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 3:02 AM PDT | Excessive Heat Warning | SGX | Riverside, San Diego | 64 hr |
| Aug 12, 9:18 AM PDT | Flash Flood Watch | SGX | Riverside, San Bernardino, San Diego | 12 hr |
| Aug 12, 12:52 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 85 min |
| Aug 12, 1:21 PM PDT | Areal Flood Advisory | SGX | San Diego | 77 min |
| Aug 12, 1:56 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 3 hr |
| Aug 12, 2:13 PM PDT | Areal Flood Advisory | SGX | San Diego | 77 min |
| Aug 12, 2:25 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 3 hr |
| Aug 12, 3:03 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 3 hr |
| Aug 12, 3:48 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 27 min |
| Aug 12, 4:15 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 45 min |
| Aug 12, 4:33 PM PDT | Tornado Warning | SGX | Riverside | 27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.