Alert archive / California / Flash Flood Warnings in 2012

Flash Flood Warning 29, NWS San Diego, CA

August 22, 2012San Diego County, California

NWS San Diego, CA issued this flash flood warning at Aug 22, 2012, 1:59 PM PDT for San Diego County, California. It was in force for 2 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 22, 2012, 1:59 PM PDT (20:59 UTC)
Expired
Aug 22, 2012, 4:00 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), 80 km from the middle of the area, began a volume at 20:59 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

TimeReportWhereRemark
Aug 22, 2:59 PM PDTFLASH FLOOD10 Nnw Ocotillo Wells, CACALIFORNIA HIGHWAY PATROL REPORTS ROADWAY FLOODING ALONG COUNTY HIGHWAY 22...OTHERWISE KNOWN AS BORREGO SALTON SEA WAY.

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, 9.0 hours before the alert went out and 99 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.

Skew-T log-pSkew-T log-p diagram, San Diego, CA at 12:00Z on 2012-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2012-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
596 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
6 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

110 
WGUS56 KSGX 222059
FFWSGX
CAC073-222300-
/O.NEW.KSGX.FF.W.0029.120822T2059Z-120822T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
159 PM PDT WED AUG 22 2012

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA...
  THIS INCLUDES THE CITY OF BORREGO SPRINGS...

* UNTIL 400 PM PDT

* AT 148 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A THUNDERSTORM CAPABLE OF PRODUCING FLASH FLOODING OVER THE WARNED 
  AREA.

* THE STORM CAPABLE OF PRODUCING FLASH FLOODING IS LOCATED OVER      
  BORREGO SPRINGS...AND COULD AFFECT OTHER RURAL AREAS WITHIN THE    
  WARNED BOX.

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 3318 11644 3327 11643 3335 11639 3333 11608
      3324 11607 3315 11608

$$

JJT
2 follow-up statements
988 
WGUS76 KSGX 222135
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
235 PM PDT WED AUG 22 2012

CAC073-222300-
/O.CON.KSGX.FF.W.0029.000000T0000Z-120822T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
235 PM PDT WED AUG 22 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM PDT FOR
NORTHEASTERN SAN DIEGO COUNTY...

AT 235 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THUNDERSTORMS PRODUCING HEAVY RAIN ARE MOVING OVER THE 
BORREGO BAD-LANDS...WHICH IS ABOUT 5 MILES NORTHEAST OF BORREGO 
SPRINGS...AND STARTING TO MOVE OFF TO THE EAST. CONSIDERABLE RUN-OFF 
IS LIKELY IN COYOTE CREEK...AND FLOWING WATERS MAY RUN OVER HIGHWAY 
78 AND HIGHWAY 22. SAN FELIPE CREEK MAY BE IMPACTED AS HEAVY RAINS 
START TO MOVE OVER THAT AREA.

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 3318 11644 3327 11643 3335 11639 3333 11608
      3324 11607 3315 11608

$$

HARRISON
711 
WGUS76 KSGX 222257
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
357 PM PDT WED AUG 22 2012

CAC073-222304-
/O.EXP.KSGX.FF.W.0029.000000T0000Z-120822T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
357 PM PDT WED AUG 22 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM PDT FOR NORTHEASTERN
SAN DIEGO COUNTY...

HEAVY SHOWERS AND THUNDERSTORMS HAVE MOVED OUT OF THE AREA OVER 
BORREGO SPRINGS...THE BORREGO BAD-LANDS...COYOTE CREEK AND COUNTY 
HIGHWAY 22.  THEREFORE...THE FLASH FLOOD WARNING WILL BE ALLOWED TO 
EXPIRE. HOWEVER...EXPECT SOME RUN-OFF TO CONTINUE OVER THE NEXT 
COUPLE HOURS.  

LAT...LON 3318 11644 3327 11643 3335 11639 3333 11608
      3324 11607 3315 11608

$$

HARRISON

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 22, 9:57 AM PDTFlash Flood WatchSGXRiverside, San Bernardino, San Diego8 hr
Aug 22, 3:36 PM PDTFlash Flood WarningSGXSan Diego2 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.