Damaging Wind in California, May 29, 2009

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
230 PM PDT FRI MAY 29 2009

.SYNOPSIS...MID LEVEL MOISTURE IN SOUTHEAST FLOW WILL CAUSE ISOLATED
THUNDERSTORMS IN THE HIGHER MOUNTAINS AND HIGH DESERTS THIS
AFTERNOON. A DEEP MARINE LAYER AND ONSHORE FLOW WILL CONTINUE LOW
CLOUDS...LOCAL FOG AND DRIZZLE WEST OF THE MOUNTAINS DURING THE
NIGHTS AND MORNINGS INTO EARLY NEXT WEEK. ONLY PARTIAL AFTERNOON
CLEARING NEAR THE COAST. THE MARINE LAYER WILL DECREASE BY THE
MIDDLE OF NEXT WEEK BUT THERE WILL BE MORE HIGH CLOUDINESS IN
SOUTHWEST FLOW ALOFT.

&&

.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO...
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.

.SHORT TERM (TODAY-MONDAY)...LOW CLOUDS...LOCAL FOG AND DRIZZLE WERE
INTO THE LOWER COASTAL MOUNTAIN SLOPES THIS MORNING AND REMAINED IN
THE COASTAL AREAS INTO THE AFTERNOON. THERE WERE ALSO A FEW MID
LEVEL CLOUDS IN SE FLOW AND THUNDERSTORMS DEVELOPED IN THE
SAN BERNARDINO COUNTY MOUNTAINS AND DESERTS LATE THIS MORNING AND
EARLY AFTERNOON. AIRCRAFT SOUNDINGS INDICATED AN INVERSION BASED
NEAR 2700 FT WITH SE WINDS THROUGH THE MID LEVELS. ONSHORE GRADIENTS
WITH ABOUT 6 MB SAN-IPL.

THERE WILL BE ENOUGH MOISTURE AND INSTABILITY FOR CU OVER THE
MOUNTAINS THIS AFTERNOON WITH ISOLATED THUNDERSTORMS OVER THE HIGHER
TERRAIN AND IN THE HIGH DESERTS. THE MID LEVEL MOISTURE WILL
DECREASE SATURDAY THROUGH MONDAY FOR LESS AFTERNOON CU OVER THE
MOUNTAINS AND PROBABLY NO THUNDERSTORMS. A WEAK UPPER LOW WILL MOVE
OVER SRN CA THROUGH SATURDAY FOLLOWED BY A WEAK SHORT WAVE RIDGE.
THE MARINE LAYER IS EXPECTED TO REMAIN ABOUT 3000 FT DEEP INTO
SUNDAY AND THEN DECREASE A LITTLE BY MONDAY. THIS WILL MAINTAIN LOW
CLOUDS...LOCAL FOG AND DRIZZLE INTO THE LOWER COASTAL MOUNTAIN
SLOPES TONIGHT AND AGAIN SATURDAY NIGHT...BECOMING A LITTLE LESS
EXTENSIVE SUNDAY NIGHT. EXPECT ONLY PARTIAL AFTERNOON CLEARING NEAR
THE COAST EACH DAY EXCEPT BETTER CLEARING MONDAY. MINOR DAY TO DAY
TEMP CHANGES EXCEPT WITH JUST A SLIGHT UPWARD TREND IN MOST
AREAS...MAINLY DEPENDENT ON WHERE AND HOW QUICKLY THE STRATUS BURNS
OFF.

&&

.LONG TERM (TUESDAY-FRIDAY)...AN UPPER LOW IS EXPECTED TO APPROACH
FROM THE NW AND THEN MEANDER OFF OF CENTRAL CA. THIS WILL CAUSE SW
FLOW ALOFT WITH GENERALLY INCREASING HEIGHTS LOCALLY WEDNESDAY AND
THURSDAY. THE LOW MAY FINALLY MOVE INLAND FRIDAY. LITTLE TEMP CHANGE
TUESDAY THEN SLIGHTLY WARMER. THE MARINE LAYER WILL BECOME SHALLOWER
FOR LESS NIGHT AND MORNING LOW CLOUDS AND FOG WEST OF THE MOUNTAINS.
HOWEVER...THERE WILL BE MORE HIGH CLOUDINESS...ESPECIALLY TUESDAY
AND WEDNESDAY.

&&

.AVIATION...
292030Z...WIDESPREAD STRATUS WEST OF THE MOUNTAINS WITH MULTIPLE
CLOUD LAYERS BETWEEN 500-2000 FT MSL AND TOPS TO 3500 FT REMAINS
THIS AFTERNOON...EXCEPT FOR THE INLAND EMPIRE WHERE LOW CLOUDS HAVE
SCATTERED OUT. AREAS OF VIS OF 2-4 MILES REMAIN IN SOME AREAS.
LITTLE OR NO CLEARING WILL OCCUR IN THE COASTAL AREAS THROUGH THIS
AFTERNOON. STRATUS WILL SPREAD INLAND AGAIN EARLY THIS
EVENING...OBSCURING HIGHER TERRAIN. EXPECT CLEARING INLAND ON SAT
MORNING AROUND 17-18Z...BUT LINGERING CIGS 1000FT TO 2000 FT MSL IN
THE COASTAL AREAS.

ABOVE THE MARINE LAYER...MID AND HIGH CLOUDS WILL CONTINUE. TSTMS
HAVE DEVELOPED OVER THE SAN BERNARDINO MTNS  AND MOVED INTO THE
APPLE VALLEY. TSTMS WILL CONTINUE INTO LATE AFTERNOON.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

PUBLIC...ATKIN
AVIATION...PG

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
1100 AM PDT FRI MAY 29 2009

CAZ042-043-048-050-055>058-060>062-300000-
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-
1100 AM PDT FRI MAY 29 2009

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

.DAY ONE...TODAY AND TONIGHT

ISOLATED THUNDERSTORMS IN THE SAN BERNARDINO COUNTY MOUNTAINS AND
DESERTS AND A SLIGHT CHANCE OF THUNDERSTORMS IN THE RIVERSIDE COUNTY
MOUNTAINS TODAY. RAINFALL WILL BE LIGHT BUT THERE COULD BE STRONG
GUSTY WINDS AND DEADLY LIGHTNING ASSOCIATED WITH THESE STORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

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.

ATKIN