^{Real Time Irvine Weather}

Expires:No;;858302
FXUS66 KSGX 082020
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
200 PM PDT WED SEP 8 2010
.SYNOPSIS...
TEMPERATURES WILL REMAIN WELL BELOW SEASONAL AVERAGES THROUGH 
THURSDAY...WITH A DEEP MARINE LAYER BRINGING EXTENSIVE LOW CLOUDS 
AND PATCHY FOG INLAND TO THE COASTAL MOUNTAIN SLOPES TONIGHT INTO 
THURSDAY MORNING. LOCAL DRIZZLE IS ALSO POSSIBLE EARLY THURSDAY 
MORNING. PARTIAL AFTERNOON CLEARING NEAR THE COAST. BREEZY IN THE 
MOUNTAINS AND DESERTS TONIGHT INTO THURSDAY. WARMER WITH A LESS 
EXTENSIVE MARINE LAYER FRIDAY INTO EARLY NEXT WEEK. 
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THIS AFTERNOON...THE MARINE LAYER HAS INCREASED TO NEAR 4500 FEET 
WITH LOW CLOUDS PERSISTING...AND ONLY SOME CLEARING OVER THE SAN 
DIEGO COUNTY VALLEYS.
A TROUGH OF LOW PRESSURE WILL DEEPEN OVER THE WEST COAST INTO 
THURSDAY BRINGING TEMPERATURES WELL BELOW SEASONAL AVERAGES...A 
DEEPER MARINE LAYER WITH COASTAL LOW CLOUDS EXTENDING ONTO THE LOWER 
COASTAL SLOPES AND GUSTY ONSHORE WINDS IN THE MOUNTAINS AND DESERTS 
AT TIMES. THERE COULD BE SOME PATCHY DRIZZLE FROM THE DEEP MARINE 
LAYER AGAIN LATE TONIGHT INTO THURSDAY MORNING. THE LOWEST 
TEMPERATURES ARE EXPECTED THURSDAY WITH HIGH TEMPERATURES AT LEAST 
10 DEGREES BELOW AVERAGE IN MOST AREAS AND AS MUCH AS 20 TO 25 
DEGREES BELOW AVERAGE IN SOME INLAND VALLEY AND LOWER MOUNTAIN 
AREAS. THE STRONGEST WINDS WILL OCCUR LATE TONIGHT INTO THU MORNING 
WITH WIND GUSTS AROUND 40 MPH POSSIBLE AT FAVORED LOCATIONS IN THE 
PASSES...CANYONS AND ON THE DESERT SLOPES OF THE MTNS.
FOR FRIDAY...A SLOW WARMING TREND BEGINS AS THE TROUGH WEAKENS AND 
MOVES EAST WITH THE MARINE LAYER BEGINNING TO DECREASE IN DEPTH. FOR 
THE WEEKEND...A WEAK HIGH PRESSURE RIDGE BUILDS OVER SOCAL AND WEAK 
LOW PRESSURE REMAINS OFF THE COAST...CONTINUING THE SLOW WARMING. IN 
SPITE OF THIS...TEMPERATURES WILL REMAIN 4 TO 8 DEGREES BELOW 
AVERAGE FOR SOME COASTAL AND VALLEY AREAS. BY THE MIDDLE OF NEXT 
WEEK...ANOTHER DEEP TROUGH APPROACHES THE WEST COAST FOR MORE 
COOLING AND A DEEPER MARINE LAYER.
&&
.AVIATION...
082030Z...LOW CLOUDS CONTINUE OVER MOST OF THE COASTAL BASIN WITH 
BASES 3500 FEET AND TOPS 4500 FEET MSL. AIRPORT CEILINGS WILL 
PROBABLY NOT CLEAR EXCEPT MAYBE AT KSAN AND KCRQ WHERE CLEAR SKIES 
ARE CLOSE. THE MARINE LAYER WILL CONTINUE TO DEEPEN TONIGHT TO MORE 
THAN 5000 FEET WITH MORE FOG OBSCURING MOUNTAIN SLOPES AND AREAS OF 
DRIZZLE ANYWHERE UNDER THE CLOUDS. SOME CLEARING IS EXPECTED WEST OF 
THE MOUNTAINS BY 18-20Z THURSDAY...MOST LIKELY AT THE COAST. BEYOND 
THE MARINE LAYER...THERE WILL BE STRONG AND GUSTY WEST WINDS TO 40 
KT AND ASSOCIATED TURBULENCE OVER THE DESERTS AND DESERT SLOPES THIS 
AFTERNOON THROUGH THURSDAY.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.
&&
$$
PUBLIC...PG
AVIATION/MARINE...MM
NWS ON THE WEB AT WEATHER.GOV/SANDIEGO