Flash Flood Warning 45, NWS San Diego, CA

000 
WGUS76 KSGX 042257
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
352 PM PDT TUE SEP 4 2007

CAC065-042302-
RIVERSIDE CA-
352 PM PDT TUE SEP 4 2007

...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM PDT FOR CENTRAL
RIVERSIDE COUNTY...

THE FLASH FLOOD WARNING FOR THE MOUNTAINS OF WESTERN RIVERSIDE 
COUNTY WILL BE ALLOWED TO EXPIRE AT 4 PM. DOPPLER RADAR INDICATES 
THE THUNDERSTORMS NEAR SANTA ROSA MOUNTAIN HAVE WEAKENED AND THE 
RAINFALL HAS DECREASED SIGNIFICANTLY...HOWEVER RUNNOFF MAY STILL BE 
PRESENT IN WASHES AND STREAMS AND THE PUBLIC IS ADVISED TO CONTINUE 
TO EXERCISE CAUTION IF TRAVELLING IN THOSE AREAS.

LAT...LON 3359 11663 3375 11661 3383 11633 3371 11611
      3351 11609 3345 11624 3344 11657
TIME...MOT...LOC 2252Z 180DEG 0KT 3350 11646

$$

PG

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
130 PM PDT TUE SEP 4 2007

.SYNOPSIS...
A COOLING TREND WILL CONTINUE INTO WEDNESDAY AS A TROUGH OF LOW
PRESSURE MOVES INLAND FROM THE PACIFIC NORTHWEST THROUGH THE GREAT
BASIN. TEMPERATURES WILL COOL TO NEAR SEASONAL AVERAGES FOR THE
LATTER HALF OF THE WEEK. A DRYING TREND WILL REDUCE THUNDERSTORM
CHANCES IN THE MOUNTAINS AND DESERTS. A WEAK COASTAL EDDY WILL BRING
A SLOW RETURN OF THE MARINE LAYER THROUGH WEDNESDAY.

&&

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

.SHORT TERM (REMAINDER TODAY THROUGH FRIDAY)...
FORECAST ON TRACK...DRIER AND COOLER WESTERLY FLOW HAS LIMITED
THUNDERSTORMS DEVELOPMENT AND FORCED THOSE THAT HAVE DEVELOPED TO
DRIFT OVER THE DESERT AREAS. TEMPERATURES ARE 5 TO 15 DEGREES COOLER
OVER THE COASTS AND VALLEYS AND 5 TO 10 DEGREES COOLER ELSEWHERE. A
FEW STATIONS ARE MEETING EXCESSIVE HEAT INDEX CRITERIA OF 105
DEGREES SO WILL LET THE HEAT WARNING RIDE UNTIL 600 PM THIS
EVENING...BUT DO NOT PLAN ON ANY REISSUANCE AS WEDNESDAY SHOULD BE
EVEN COOLER AS AIR MASS COOLS ANOTHER 5 DEGREES IN THE LOWER 8000
FEET AND WITH DRYING IN THE MID LEVELS MAKES THREAT OF THUNDERSTORMS
EVEN LESS. FOR THURSDAY THE FLOW BACKS TO SOUTHERLY AND MOSAITURE
CONFLUENCE NOTED IN THE 5000-10000 FOOT LAYER OVER MOUNTAINS AND
DESERTS...SO THREAT OF THUNDERSTORMS SHOULD INCREASE THURSDAY.

&&

.LONG TERM...FRIDAY THROUGH TUESDAY...
KIND OF A NONDESCRIPT SYNOPTIC PATTERN OVER SOUTHERN CALIFORNIA
DURING THIS PERIOD...A COL WILL BE CENTERED OVER CENTRAL CALIFORNIA
BETWEEN A HIGH CELL OFF THE NORTHERN CALIFORNIA COAST...ANOTHER HIGH
CELL OVER SOUTH TEXAS/NE MEXICO...A TROUGH OVER THE NORTHERN PLAINS
STATES AND A WEAK LOW WEST OF BAJA CALIFORNIA. WEAK SUBISDENCE ALOFT
SHOIULD PREAVIL THROUGH THE PERIOD. THE MARINE LAYER SHOIULD BEGIN
TO EXTERT MORE OF AN INFLUENCE ON THE LOWER WESTERN VALLEYS. A
GENERAL COOLING TREND BACK TO NORMAL IS FORECAST AND SEEMS
REASONABLE GIVEN THE LACK OF ANY STRONG WEATHER FEATURES AFFECTING
THE AREA.

&&

.AVIATION...
041930...MAIN CONCERNS FOR THE REMAINDER OF THE AFTERNOON WILL BE
THE THUNDERSTORMS OVER THE MOUNTAINS AND ADJACENT DESERT AREAS AND
THE HIGH MAXIMUM TEMPERATURES. STRATUS SHOULD RETURN TO THE COASTAL
AREAS OVERNIGHT TONIGHT WITH CEILINGS EXPECTED AT COASTAL AIRPORTS.

THE AIR MASS REMAINS UNSTABLE ENOUGH FOR ISOLATED THUNDERSTORMS OVER
THE MOUNTAINS AND ADJACENT DESERT AREAS THROUGH THE AFTERNOON. THIS
THUNDERSTORM ACTIVITY SHOULD END BY SUNSET. BASES OF THUNDERSTORMS
SHOULD BE AROUND FL080 WITH TOPS TO FL400 AT TIMES. CONDITIONS ON
WEDNESDAY WILL REMAIN FAVORABLE FOR SOME ACTIVITY...AGAIN...
WEDNESDAY AFTERNOON OVER THE SAME AREAS.

AFTERNOON TEMPERATURES ARE RUNNING A LITTLE LOWER THAN MONDAY
AFTERNOON BUT STILL EXPECTING MAXIMUM TEMPERATURES AROUND 30 DEGREES
C AT KSAN AND KSNA...40 C AT KONT...AND 42 C AT KPSP. WEDNESDAY
AFTERNOON TEMPERATURES SHOULD BE LOWER.

MARINE LAYER THIS AFTERNOON WAS STILL LESS THAN 1000 FEET WITH
PATCHY STRATUS SHOWING UP OVER THE COASTAL WATERS. A COASTAL EDDY IS
IN PLACE WHICH SHOULD HELP DEEPEN THE MARINE LAYER TO AROUND 1200
TONIGHT AND WEDNESDAY MORNING. THIS SHOULD BRING STRATUS/FOG TO THE
COAST THIS EVENING AND OVER THE COASTAL AIRPORTS AROUND MIDNIGHT.
BASES SHOULD BE AROUND 700 FEET MSL. STRATUS SHOULD BURN OFF BETWEEN
15Z AND 16Z ON WEDNESDAY.  HORTON

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...EXCESSIVE HEAT WARNING UNTIL 6 PM PDT THIS AFTERNOON FOR SAN
BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-SAN DIEGO
COUNTY VALLEYS.

PZ...NONE.

&&

PUBLIC/FIRE WEATHER...BALFOUR
AVIATION/MARINE...HORTON
SHORT TERM/WARNINGS...GONSALVES

NWS ON THE WEB AT WEATHER.GOV/SANDIEGO

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
430 AM PDT TUE SEP 4 2007

CAZ042-043-048-050-055>058-060>062-040100-
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 AM PDT TUE SEP 4 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS SOUTHWEST CALIFORNIA.

.DAY ONE... TODAY AND TONIGHT

HIGH RIP CURRENT RISK AT THE BEACHES. SEE LAXSRFSGX FOR DETAILS.

EXCESSIVE HEAT WARNING FOR THE INLAND VALLEYS. SEE LAXNPWSGX FOR
DETAILS.

SLIGHT CHANCE OF AFTERNOON AND EARLY EVENING THUNDERSTORMS IN THE
MOUNTAINS AND DESERTS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY

HIGH RIP CURRENT RISK AT THE BEACHES FOR WEDNESDAY. SEE LAXSRFSGX
FOR DETAILS.

.SPOTTER INFORMATION STATEMENT...
SKYWARN WEATHER ACTIVATION IS NOT REQUESTED AT THIS TIME. SPOTTERS
ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.

MARTIN