Severe Thunderstorm Warning 8, NWS San Diego, CA

467 
WWUS56 KSGX 242057
SVSSGX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
157 PM PDT SAT AUG 24 2013

CAC065-073-242130-
/O.CON.KSGX.SV.W.0008.000000T0000Z-130824T2130Z/
SAN DIEGO CA-RIVERSIDE CA-
157 PM PDT SAT AUG 24 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM PDT
FOR CENTRAL RIVERSIDE AND NORTHEASTERN SAN DIEGO COUNTIES...

AT 148 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED BETWEEN 
THERMAL AND LA QUINTA...MOVING NORTHWEST AT 20 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM WILL CONTINUE TO PRODUCE LOCAL VISIBILITIES BELOW 1/4 
MILE IN BLOWING DUST AND DAMAGING WINDS. DO NOT ATTEMPT TO DRIVE 
THROUGH AREAS OF BLOWING DUST WITH REDUCED VISIBILITIES. 

AT 126 PM AT THERMAL THE WINDS GUSTED TO 38 MPH AND THE VISIBILITY 
DROPPED TO 3/4 MILE IN BLOWING DUST. 

LAT...LON 3359 11630 3378 11654 3388 11620 3373 11602
      3373 11595 3351 11596 3352 11600 3352 11606
      3350 11607 3343 11604 3344 11608 3308 11608
      3308 11633
TIME...MOT...LOC 2047Z 138DEG 4KT 3356 11615

$$

SMALL

801 
WWUS56 KSGX 242127
SVSSGX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
227 PM PDT SAT AUG 24 2013

CAC065-073-242136-
/O.EXP.KSGX.SV.W.0008.000000T0000Z-130824T2130Z/
SAN DIEGO CA-RIVERSIDE CA-
227 PM PDT SAT AUG 24 2013

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL RIVERSIDE AND
NORTHEASTERN SAN DIEGO COUNTIES WILL EXPIRE AT 230 PM PDT...

THE THUNDERSTORMS HAVE WEAKENED IN THIS AREA SO THE SEVERE 
THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 3359 11630 3378 11654 3388 11620 3373 11602
      3373 11595 3351 11596 3352 11600 3352 11606
      3350 11607 3343 11604 3344 11608 3308 11608
      3308 11633
TIME...MOT...LOC 2126Z 138DEG 4KT 3359 11618

$$

SMALL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
910 AM PDT SAT AUG 24 2013

.SYNOPSIS...
MONSOONAL MOISTURE AND REMNANTS OF TROPICAL STORM IVO WILL SPREAD
NORTHWARD INTO THE SOUTHEASTERN HALF OF SOUTHERN CALIFORNIA FOR THE
NEXT FEW DAYS WITH THE GREATEST INFLUX SUNDAY AND MONDAY. THIS WILL
BRING SHOWERS AND THUNDERSTORMS TO THE MOUNTAINS AND DESERTS...AND A
CHANCE OF SHOWERS AND A FEW THUNDERSTORMS WEST OF THE MOUNTAINS.
THERE WILL BE A NOTICEABLE INCREASE IN HUMIDITY BY MONDAY...BUT
TEMPERATURES SHOULD REMAIN NEAR NORMAL. OCCASIONAL INTRUSIONS OF
MONSOONAL MOISTURE ARE POSSIBLE THROUGH NEXT WEEK AS THE WESTERLIES
RETREAT FARTHER TO THE NORTH.

&&

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

THE MARINE STRATUS MADE A GOOD RUN INLAND OVERNIGHT ALONG THE COAST
AND EXTENDED LOCALLY INTO THE WESTERN VALLEYS. THE 12Z MIRAMAR
SOUNDING HAD A STRONG 11 DEGREE C INVERSION BASED NEAR 1300 FT. A
DEEP DRY LAYER EXTENDED FROM THE TOP OF THE MARINE LAYER THROUGH 12K
FT AND WINDS WERE SW AT 15-20 KT. PW HAD DECREASED TO 0.89 THROUGH
THE COLUMN. ALTHOUGH...PW SOUNDERS OVER THE DESERTS STILL INDICATED
NEAR 1.5 INCHES. A FEW ACCAS WERE PRESENT ABOVE THE MARINE LAYER...
OTHERWISE IT WAS CLEAR.

DESPITE THE DRYING ALOFT...THERE IS STILL A SHALLOW MOIST LAYER OVER
THE DESERTS WHERE SFC DEWPOINTS ARE IN THE 70S THIS MORNING. HARD TO
DETERMINE WITH SPARSE OBSERVATIONS...BUT IT LOOKS TO BE AROUND 1000
FT DEEP. DRYING AT MOUNTAIN TOP SHOULD INHIBIT CONVECTION EARLY THIS
AFTERNOON...BUT MAY BE ABLE TO FIRE LATER IF UPSLOPE ALONG THE
DESERT FOOTHILLS AND THE SEA BREEZE CAN PROVIDE SUFFICIENT
CONVERGENCE. IN ANY CASE...CONVECTION SHOULD BE LESS...AND FAVORED
OVER THE LOWER DESERT FOOTHILLS. THE MARINE STRATUS SHOULD CLEAR
QUICKLY...BUT MAY LINGER AT SOME BEACHES INTO THE AFTERNOON DUE TO
THE STRONG INVERSION. EXPECT THE MARINE LAYER STRATUS WILL BE
DISRUPTED AND LESS LIKELY OVER COASTAL AREAS FOR THE NEXT FEW DAYS.
TEMPERATURES SHOULD BE QUITE WARM AGAIN INLAND AND NEAR NORMAL ALONG
THE COAST.

MOISTURE WILL STEADILY INCREASE OVER THE REGION THROUGH MON AS
TROPICAL STORM IVO DRIFTS NORTH OFF THE BAJA PENINSULA. THIS STORM
IS FORECAST TO WEAKEN TO A REMNANT LOW WELL SOUTH OF SAN DIEGO...
HOWEVER...MOISTURE ASSOCIATED WITH IT WILL CONTINUE TO MOVE NE OVER
SOCAL WITH INCREASING CLOUDS AND POPS. AS MOISTURE BUILDS ON SUN
WITH FULL AFTERNOON SUN...EXPECT WIDESPREAD THUNDERSTORM ACTIVITY IN
THE MTNS/DESERTS. FOR SUN NIGHT THROUGH MON...WIDESPREAD DEEP
TROPICAL MOISTURE WITH PWS IN EXCESS OF TWO INCHES SHOULD RESULT IN
WIDESPREAD CLOUDS/SHOWERS/AND SCATTERED TSTMS. CLOUDS COULD INHIBIT
INTENSE CONVECTION AND RESULT IN A MORE STRATIFORM RAIN PATTERN.
GIVEN THE DEEP SATURATION OF THE AIRMASS THOUGH...IT WILL NOT TAKE
MUCH FOR MODERATE/HEAVY RAINFALL TO ACCUMULATE...ESPECIALLY IN THE
MTNS WHERE THE AIRMASS IS LIFTED. DEBRIS FLOWS AND FLASH FLOODING
WILL BE A MAJOR CONCERN IN AND BELOW BURN SCARS. A FLASH FLOOD WATCH
IS IN EFFECT SUN/MON.

SOME DECREASE IN MOISTURE IS LIKELY AFTER MON...AS THE REMNANTS OF
IVO EXIT THE AREA...HOWEVER MOISTURE STILL LOOKS SUFFICIENT FOR
AFTERNOON CONVECTION IN THE MTNS/DESERTS. NO BIG CHANGES THROUGH
NEXT WEEK AS WE REMAIN UNDER THE BROAD CIRCULATION OF THE
SUBTROPICAL HIGH CENTERED OVER THE SOUTHERN PLAINS/ROCKIES. PERIODIC
SURGES OF MONSOONAL MOISTURE ARE POSSIBLE WITH ASSOCIATED CLOUDS AND
TSTMS...MAINLY IN THE MOUNTAINS/DESERTS.

&&

.AVIATION...
241530Z...COAST/VALLEYS...WIDESPREAD LOW CLOUDS WITH AREAS OF FOG
OVER THE COASTAL AREAS AND WESTERN PORTIONS OF THE SAN DIEGO COUNTY
VALLEYS. BASES ARE BETWEEN 700 AND 1000 FT MSL AND TOPS ARE BETWEEN
800 AND 1200 FT MSL...WITH AREAS OF VIS BLO 3SM LOCALLY BLO 1SM.
EXPECT CLEARING TO THE COAST BETWEEN 17Z AND 18Z. PATCHES OF LOW
CLOUDS AND FOG WILL LIKELY RETURN TO THE COASTAL AREAS AFTER
06Z...BUT MAY NOT IMPACT COASTAL TAF SITES.

OTHERWISE...SCT-BKN CLOUDS AOA 10000 FT.

MTNS/DESERTS...ISOLATED THUNDERSTORMS ARE EXPECTED OVER THE MTNS AND
DESERTS THIS AFTN/EVENING WITH SCT-BKN CLOUDS LAYERED 10000 FT TO
35000 FT.

&&

.FIRE WEATHER...

GENERALLY DECREASING CHANCES OF WILDFIRES OVER THE NEXT FEW DAYS AS
RH INCREASES AND WIDESPREAD WETTING RAINS DEVELOP. HOWEVER...RH HAS
DECREASED MARKEDLY IN THE MOUNTAINS THIS MORNING AND THERE IS A
SLIGHT CHANCE FOR ISOLATED THUNDERSTORMS BY MID-AFTERNOON. DUE TO A
DEEP DRY LAYER...A FEW DRY LIGHTNING STRIKES ARE POSSIBLE LATER
TODAY...MAINLY ON THE DESERT SLOPES.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...FLASH FLOOD WATCH FROM SUNDAY MORNING THROUGH MONDAY EVENING
     FOR THE APPLE AND LUCERNE VALLEYS...COACHELLA VALLEY...
     RIVERSIDE COUNTY MOUNTAINS...SAN BERNARDINO COUNTY
     MOUNTAINS...SAN DIEGO COUNTY DESERTS...SAN DIEGO COUNTY
     MOUNTAINS.

PZ...NONE.

&&

PUBLIC...JAD
AVIATION/MARINE...PG

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
530 AM PDT SAT AUG 24 2013

CAZ055-056-058-060>062-250100-
SAN BERNARDINO COUNTY MOUNTAINS-RIVERSIDE COUNTY MOUNTAINS-
SAN DIEGO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-
530 AM PDT SAT AUG 24 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MOUNTAINS AND DESERTS OF
EXTREME SOUTHWESTERN CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

WIDELY SCATTERED AFTERNOON AND EARLY EVENING THUNDERSTORMS...MAINLY
FOR RIVERSIDE AND SAN DIEGO COUNTIES...WITH LOCALLY HEAVY RAINFALL
AND ISOLATED FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

FOR SUNDAY AND MONDAY...THUNDERSTORMS WITH AREAS OF HEAVY RAINFALL
AND FLASH FLOODING.

FOR TUESDAY THROUGH FRIDAY...AFTERNOON AND EVENING THUNDERSTORMS.

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

CAZ048-050-250100-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY VALLEYS-
530 AM PDT SAT AUG 24 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR INLAND VALLEYS OF EXTREME
SOUTHWESTERN CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

FOR SUNDAY AND MONDAY...CHANCE OF THUNDERSTORMS WITH ISOLATED FLASH
FLOODING...MAINLY NEAR THE FOOTHILLS.

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

17