Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 23, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 17, 2012, 12:28 PM PDT for Riverside County, 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 17, 2012, 12:28 PM PDT (19:28 UTC)
- Expired
- Aug 17, 2012, 2:30 PM PDT
- In force
- 2 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Riverside County, CA, San Diego County, CA
The radar
The San Diego radar (KNKX), 61 km from the middle of the area, began a volume at 19:28 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 78 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
- 139 J/kg
- Mixed-layer CIN
- -312 J/kg
- Mixed-layer LCL
- 1655 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
238
WGUS56 KSGX 171928
FFWSGX
CAC065-073-172130-
/O.NEW.KSGX.FF.W.0023.120817T1928Z-120817T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1228 PM PDT FRI AUG 17 2012
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHWESTERN RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA...
NORTH CENTRAL SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA...
* UNTIL 230 PM PDT.
* AT 1218 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS PRODUCING HEAVY RAIN AND POSSIBLE FLASH FLOODING
OVER SAGE...SOUTH 79 FREEWAY...OAK GROVE...AND PALOMAR MOUNTAIN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
LAT...LON 3334 11688 3340 11704 3364 11702 3363 11687
3336 11671
$$
HARRISON2 follow-up statements
210
WGUS76 KSGX 172025
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
125 PM PDT FRI AUG 17 2012
CAC065-073-172130-
/O.CON.KSGX.FF.W.0023.000000T0000Z-120817T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-RIVERSIDE CA-
125 PM PDT FRI AUG 17 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM PDT FOR
SOUTHWESTERN RIVERSIDE AND NORTH CENTRAL SAN DIEGO COUNTIES...
AT 117 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE HEAVY RAIN PRODUCING FLASH FLOODING OVER THE WARNED AREA.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
AGUANGA...PALOMAR MOUNTAIN AND OAK GROVE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
&&
LAT...LON 3334 11688 3340 11704 3364 11702 3363 11687
3336 11671
$$
MM786
WGUS76 KSGX 172124
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
224 PM PDT FRI AUG 17 2012
CAC065-073-172132-
/O.EXP.KSGX.FF.W.0023.000000T0000Z-120817T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-RIVERSIDE CA-
224 PM PDT FRI AUG 17 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 230 PM PDT FOR SOUTHWESTERN
RIVERSIDE AND NORTH CENTRAL SAN DIEGO COUNTIES...
THE STORM OVER THE AREA HAS DECREASED IN COVERAGE AND INTENSITY...
THEREFORE THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 230
PM.
LAT...LON 3334 11688 3340 11704 3364 11702 3363 11687
3336 11671
$$
SMALLThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 7:07 PM PDT | Flash Flood Watch | SGX | Riverside, San Bernardino, San Diego | 25 hr |
| Aug 17, 12:14 PM PDT | Flash Flood Warning | SGX | Riverside | 61 min |
| Aug 17, 12:55 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 50 min |
| Aug 17, 1:07 PM PDT | Flash Flood Warning | SGX | Riverside, San Bernardino | 3 hr |
| Aug 17, 1:39 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 51 min |
| Aug 17, 1:40 PM PDT | Flash Flood Warning | SGX | San Diego | 95 min |
| Aug 17, 2:19 PM PDT | Flash Flood Warning | SGX | Riverside | 46 min |
| Aug 17, 3:19 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 86 min |
| Aug 17, 4:47 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 75 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.