Flash Flood Warning 6, NWS San Diego, CA

000 
WGUS76 KSGX 060036
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
536 PM PDT SAT SEP 5 2009

CAC073-060230-
/O.CON.KSGX.FF.W.0006.000000T0000Z-090906T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
536 PM PDT SAT SEP 5 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM PDT FOR
NORTHEASTERN SAN DIEGO COUNTY...

AT 521 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE VERY HEAVY RAIN PRODUCING FLASH FLOODING OVER BORREGO WELLS 
AND OCOTILLO WELLS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO OCOTILLO 
WELLS AND BORREGO WELLS.

FLASH FLOODING IS OCCURRING ALONG ROADS AND WASHES IN AND NEAR THE 
TOWNS OF BORREGO WELLS AND OCOTILLO WELLS. THIS INCLUDES PORTIONS OF 
HIGHWAY 78...SPLIT MOUNTAIN ROAD...AND OLD KANE SPRINGS ROAD.

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.

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 3290 11633 3308 11640 3330 11639 3335 11608
      3308 11607 3306 11609 3263 11609 3261 11614

$$

SCV

000 
WGUS76 KSGX 060058
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
558 PM PDT SAT SEP 5 2009

CAC073-060230-
/O.CON.KSGX.FF.W.0006.000000T0000Z-090906T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
558 PM PDT SAT SEP 5 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM PDT FOR
NORTHEASTERN SAN DIEGO COUNTY...

AT 546 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE VERY HEAVY RAIN FROM A THUNDERSTORM PRODUCING FLASH 
FLOODING NEAR OCOTILLO WELLS AND BORREGO WELLS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO OCOTILLO 
WELLS AND BORREGO WELLS. FLASH FLOODING IS LIKELY ALONG OLD KANE 
SPRINGS ROAD...SPLIT MOUNTAIN ROAD...AND PORTIONS OF HIGHWAY 78.

ADDITIONAL THUNDERSTORMS DEVELOPING NEAR BORREGO SPRINGS MAY ALSO 
BECOME CAPABLE OF PRODUCING FLASH FLOODING WITHIN THE NEXT HOUR.

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.

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 3290 11633 3308 11640 3330 11639 3335 11608
      3308 11607 3306 11609 3263 11609 3261 11614

$$

SCV

000 
WGUS76 KSGX 060133
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
633 PM PDT SAT SEP 5 2009

CAC073-060230-
/O.CON.KSGX.FF.W.0006.000000T0000Z-090906T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
633 PM PDT SAT SEP 5 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM PDT FOR
NORTHEASTERN SAN DIEGO COUNTY...

AT 630 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THE THUNDERSTORMS HAD MOVED EAST OF THE AREA...HOWEVER 
EXCESSIVE RUNOFF AND FLASH FLOODING WILL CONTINUE TO OCCUR.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO OCOTILLO 
WELLS AND BORREGO WELLS. ROADS THAT MAY BE AFFECTED BY FLASH 
FLOODING INCLUDE HIGHWAY 78...OLD KANE SPRINGS ROAD...AND SPLIT 
MOUNTAIN ROAD.

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.

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 3290 11633 3308 11640 3330 11639 3335 11608
      3308 11607 3306 11609 3263 11609 3261 11614

$$

SCV

000 
WGUS76 KSGX 060223
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
723 PM PDT SAT SEP 5 2009

CAC073-060230-
/O.EXP.KSGX.FF.W.0006.000000T0000Z-090906T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO CA-
723 PM PDT SAT SEP 5 2009

...THE FLASH FLOOD WARNING WILL EXPIRE AT 730 PM PDT FOR NORTHEASTERN
SAN DIEGO COUNTY...

THUNDERSTORMS HAVE MOVED EAST INTO IMPERIAL COUNTY AND HEAVY RAIN 
HAS ENDED. THERE STILL COULD BE SOME MINOR RUNOFF OCCURRING IN 
NORMALLY DRY WASHES SOUTH OF OCOTILLO WELLS BETWEEN BORREGO WELLS 
AND SPLIT MOUNTAIN...BUT FLASH FLOODING IS NO LONGER EXPECTED.

LAT...LON 3290 11633 3308 11640 3330 11639 3335 11608
      3308 11607 3306 11609 3263 11609 3261 11614

$$

SCV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
125 PM PDT SAT SEP 5 2009

.SYNOPSIS...
A TROUGH OF LOW PRESSURE WILL BRING DRYING AND SOME COOLING THROUGH
THE HOLIDAY WEEKEND...AND A SLOW DEEPENING OF THE MARINE LAYER FOR
MORE EXTENSIVE NIGHT AND MORNING COASTAL LOW CLOUDS AND FOG.
ISOLATED THUNDERSTORMS ARE POSSIBLE AGAIN THIS AFTERNOON AND EVENING
IN THE MOUNTAINS AND DESERTS. OTHERWISE...A RETURN OF A MORE GENERAL
MONSOONAL MOISTURE IS POSSIBLE TOWARD THE MIDDLE AND LATTER PART OF
NEXT WEEK FOR A SLIGHT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS
IN THE MOUNTAINS...DESERTS...AND INLAND VALLEYS.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

AREAS OF MID-LEVEL CLOUDS ASSOCIATED WITH A WEAK UPPER-LEVEL TROUGH
WERE DISSIPATING OVER EASTERN SECTIONS OF THE FORECAST AREA EARLY
THIS AFTERNOON BASED ON SATELLITE IMAGERY. HEATING WAS DRIVING
ISOLATED DEEP CUMULUS DEVELOPMENT BY 20Z. DEW POINTS REMAINED
ELEVATED...WHILE TEMPS WERE A FEW DEGREES LOWER THAN YESTERDAY
AFTERNOON AT 20Z. SURFACE PRESSURE GRADIENTS WERE WEAK ONSHORE.
DEWPOINTS REMAINED QUITE HIGH (MID 60S TO MID 70S F) OVER THE LOWER
DESERTS. BASED ON MOUNTAIN OBSERVATIONS...THE MOIST LAYER WAS ABOUT
4K FT DEEP.

MODEL SOUNDINGS IN THE LOWER DESERT INDICATED A WEAK MID-LEVEL CAP
WILL BE PRESENT...BUT INSTABILITY WAS SUBSTANTIAL WITH CAPES ABOVE
1500-2000 J/K AND A K INDEX NORTH OF 35. BASED ON THE DEEP MOIST
LAYER AND FORECAST MAX TEMPS ABOVE 100...EXPECT A FEW PARCELS WILL
GAIN ENOUGH SIZE AND VELOCITY TO BUILD INTO THUNDERSTORMS THIS
AFTERNOON OVER THE MOUNTAINS AND SHOULD TRACK NE INTO THE DESERTS.
OTHERWISE...DRY WEST OF THE MOUNTAINS AND WARM.

ADDITIONAL MID-LEVEL DRYING IS LIKELY BY SUN...SO THE CHANCE OF
SHOWERS AND THUNDERSTORMS WILL DIMINISH FOR THE REMAINDER OF THE
HOLIDAY WEEKEND. DRY...WESTERLY FLOW ALOFT AND INCREASING ONSHORE
SURFACE PRESSURE GRADIENTS WILL TREND US MORE TOWARD SEASONAL
CONDITIONS. WHILE NOT A FORECAST...A DROP IN SEA SURFACE TEMPS WOULD
GO A LONG WAY TOWARD THAT END AS WELL.

LATER IN THE WEEK...EASTERLY FLOW IS FORECAST TO REDEVELOP AS LOW
PRESSURE DEVELOPS OFF THE COAST AND HIGH PRESSURE STRENGTHENS
INLAND. WHILE NOT PARTICULARLY HOT FOR SOCAL...THIS FLOW COULD BRING
MORE MID-LEVEL MOISTURE AND CLOUDS BACK TO THE REGION AND A RENEWED
THREAT OF MOUNTAIN AND DESERT CONVECTION.

REGARDING SEA SURFACE TEMPS...NEAR SHORE TEMPS ARE ELEVATED NOW (MID
70S). THIS IS ABOUT 6 TO 10 DEGREES ABOVE AVERAGE...AND WHILE IT IS
GREAT FOR BEACH GOERS...IT LIMITS THE COOLING POWER OF THE SEA
BREEZE INLAND AND ELEVATES HUMIDITY...MAKING IT FEEL MORE MUGGY.
PERSISTENT NW FLOW ALONG THE CA COAST USUALLY RESULTS IN OVERTURNING
AND COOLING OF THE WATER. WHILE SOME DECREASE IN HUMIDITY IS LIKELY
OVER THE NEXT COUPLE OF DAYS...A DEFINITIVE DROP PROBABLY WILL NOT
OCCUR FOR COASTAL AND VALLEY COMMUNITIES UNTIL THE SEA SURFACE TEMPS
FALL BACK INTO THE 60S.

&&

.AVIATION...
051900Z...MARINE LAYER DEPTH WAS AROUND 1000 FEET THIS AFTERNOON AND
LITTLE CHANGE IS EXPECTED THROUGH SUNDAY. AREAS OF STRATUS SHOULD
RETURN TO THE COAST THIS EVENING WITH IFR CEILINGS AT COASTAL
AIRPORTS SUCH AS KSAN AND POSSIBLY KSNA AND LIFR CONDITIONS POSSIBLE
AT SOME MESA AIRPORTS AS WELL AS KCRQ BETWEEN MIDNIGHT AND 16Z ON
SUNDAY.

ABOVE THE MARINE LAYER...SCATTERED CU/TCU THIS AFTERNOON. THE AIR
MASS REMAINS UNSTABLE ENOUGH THAT ISOLATED CBS/TSTMS CAN NOT BE
RULED OUT BUT MOST TSTM ACTIVITY SHOULD BE SOUTH OVER NORTHERN BAJA
AND OVER THE EASTERN DESERT AREAS. ANY ACTIVITY SHOULD END BY
SUNSET. OTHERWISE MOSTLY CLEAR THROUGH SUNDAY. VISIBILITIES MOSTLY
UNRESTRICTED EXCEPT VICINITY OF WILDFIRES.  HORTON

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.

&&

PUBLIC...JAD
AVIATION/MARINE...HORTON

NWS ON THE WEB AT WEATHER.GOV/SANDIEGO

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
430 PM PDT SAT SEP 5 2009

CAZ042-043-048-050-055>058-060>062-061200-
ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS-
RIVERSIDE COUNTY MOUNTAINS-SANTA ANA MOUNTAINS AND FOOTHILLS-
SAN DIEGO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-
430 PM PDT SAT SEP 5 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF EXTREME SOUTHWESTERN
CALIFORNIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS FOR SOUTHERN MOUNTAIN AND
DESERT AREAS THROUGH EARLY EVENING. THE FLASH FLOOD POTENTIAL INDEX
IS LOW...THE RISK OF FLASH FLOODING IS MINIMAL.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...
SKYWARN WEATHER ACTIVATION IS NOT REQUESTED FOR THIS AREA...HOWEVER
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS.

MOEDE