Alert archive / California / Flash Flood Warnings in 2011

Flash Flood Warning 6, NWS San Diego, CA

July 7, 2011San Diego County, California

NWS San Diego, CA issued this flash flood warning at Jul 7, 2011, 3:34 PM PDT for San Diego County, California. It was in force for 59 min. 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
Jul 7, 2011, 3:34 PM PDT (22:34 UTC)
Expired
Jul 7, 2011, 4:33 PM PDT
In force
59 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), 82 km from the middle of the area, began a volume at 22:38 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
Jul 7, 4:02 PM PDTHEAVY RAIN 0.82 W Ocotillo Wells, CA0.80 INCHES FELL AT ALERT STATION OCWC1 BETWEEN 230 PM AND 300 PM. 0.50 INCHES FELL BETWEEN 231 PM AND 241 PM.

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, 10.6 hours before the alert went out and 100 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 2011-07-07Temperature 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 2011-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 square meters per square second.1939Sfc1 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
1301 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
12 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.

173 
WGUS56 KSGX 072234
FFWSGX
CAC073-080000-
/O.NEW.KSGX.FF.W.0006.110707T2234Z-110708T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
334 PM PDT THU JUL 7 2011

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

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

* UNTIL 500 PM PDT

* AT 325 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  RAINFALL RATES OF OVER ONE INCH PER HOUR FROM NEARLY STATIONARY 
  THUNDERSTORMS ABOUT 5 MILES NORTHWEST OF OCOTILLO WELLS. 
  THUNDERSTORMS WITH HEAVY RAIN EXTENDED FROM NEAR BORREGO SPRINGS 
  SOUTHEAST TO OCOTILLO WELLS.

* FLASH FLOODING IS LIKELY BETWEEN 340 PM AND 500 PM ALONG HIGHWAY   
  78 ABOUT 5 MILES WEST OF OCOTILLO WELLS. FLASH FLOODING IS ALSO   
  POSSIBLE IN THE BORREGO SPRINGS AREA THROUGH 500 PM.

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 3329 11640 3330 11610 3307 11609 3306 11609
      3305 11614 3303 11628

$$

MAXWELL
2 follow-up statements
294 
WGUS76 KSGX 072313
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
413 PM PDT THU JUL 7 2011

CAC073-080000-
/O.CON.KSGX.FF.W.0006.000000T0000Z-110708T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
413 PM PDT THU JUL 7 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM PDT FOR EAST
CENTRAL SAN DIEGO COUNTY...

AT 405 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED THAT 
THE THUNDERSTORM WEST AND NORTHWEST OF OCOTILLO WELLS HAD WEAKENED 
CONSIDERABLY. THE THUNDERSTORMS NEAR BORREGO SPRINGS HAD ALSO 
WEAKENED. BETWEEN 330 PM AND 400 PM...A RAIN GAUGE 2 MILES WEST OF 
OCOTILLO WELLS REPORTED 0.80 INCHES OF RAIN.

THE FLASH FLOOD THREAT HAS ENDED FOR BORREGO SPRINGS. 
HOWEVER...WATER COULD CONTINUE TO BE OVER ROADWAYS JUST WEST OF 
OCOTILLO WELLS...INCLUDING ALONG HIGHWAY 78...UNTIL AROUND 430 PM.

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 3327 11624 3330 11610 3306 11609 3305 11614
      3303 11625

$$

MAXWELL
014 
WGUS76 KSGX 072333
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
433 PM PDT THU JUL 7 2011

CAC073-072342-
/O.CAN.KSGX.FF.W.0006.000000T0000Z-110708T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
433 PM PDT THU JUL 7 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EAST CENTRAL SAN
DIEGO COUNTY...

THE HEAVY RAIN ENDED SHORTLY AFTER 400 PM...AND NO NEW FLASH 
FLOODING IS EXPECTED IN THE DESERTS OF SAN DIEGO COUNTY THIS 
AFTERNOON.

LAT...LON 3327 11624 3330 11610 3306 11609 3305 11614
      3303 11625

$$

MAXWELL

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 5:06 PM PDTAreal Flood AdvisorySGXRiverside, San Bernardino110 min
Jul 6, 6:43 PM PDTSpecial Weather StatementSGX77 min
Jul 7, 9:33 AM PDTFlash Flood WatchSGXRiverside, San Bernardino, San Diego9 hr
Jul 7, 3:12 PM PDTAreal Flood AdvisorySGXSan Diego82 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.