Lawrenceville Weather

US Weather Forecast Center

Weather for Garden Grove, California

 

Lat: 33.78N, Lon: 117.96W Wx Zone: CAZ042

High Tides: 3:07 AM (3ft) 12:27 PM (3.9ft)
Low Tides: 6:42 AM (2ft) 8:36 PM (0.3ft)

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Area Forecast Discussion

000
FXUS66 KSGX 032148
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
200 PM PST WED DEC 3 2008

.SYNOPSIS...
THE MARINE LAYER WILL CONTINUE TO BRING LOW CLOUDS AND FOG INTO THE
WESTERN VALLEYS DURING NIGHTS AND MORNINGS THROUGH THURSDAY NIGHT. A
LOW PRESSURE SYSTEM MOVING SOUTHWARD OFF THE CALIFORNIA COAST WILL
CAUSE AN INCREASE IN OFFSHORE FLOW FRIDAY. THE LOW IS NO LONGER
FORECAST TO MOVE ONSHORE THIS WEEKEND.

&&

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

.SHORT TERM...TONIGHT THROUGH SATURDAY
LITTLE CHANGE FROM EARLIER FORECAST REASONING. PRESSURE GRADIENTS
ARE NOW RELAXING...DOWN TO -6 MB AT 1300 PST BETWEEN SOUTHWEST
CALIFORNIA COAST AND NORTHERN NEVADA. PEAK WIND GUSTS OBSERVED
STAYED BELOW 35 MPH...THROWING OUT THE OBVIOUS WIND
GUST ERRORS FROM BIRDS INTERFERING WITH THE SONIC ANEMOMETERS...AND
WINDS HAVE BEEN FALLING OFF SINCE NOON. ACARS SOUNDING AROUND 1245
PST SHOWED NORTHEAST WINDS WERE DOWN TO 10-15 KT IN THE 2000-6000 FT
LAYER. MARINE LAYER AT 1300 PST APPEARED TO BE AROUND 1500 FEET OVER
EASTERN VALLEYS/FOOTHILLS SLOPING UPWARD TO AROUND 1800 FEET OVER
THE WESTERN VALLEYS TO AROUND 2400 FEET OVER THE COASTAL
PLAIN/FOOTHILLS OF ORANGE COUNTY. WITH THE WEAKENING OFFSHORE FLOW
VEERING TO EAST-SOUTHEAST REMAINDER OF THE AFTERNOON AND THE WEAK
SEA BREEZE PUSHING BACK...MARINE LAYER SHOULD SLOSH BACK AND BECOME
MORE UNIFORM IN DEPTH THIS EVENING.
FROM THE MID MORNING FORECAST DISCUSSION...SOUTHERLY FLOW INCREASES
OVERNIGHT AS LOW CURRENTLY OFF THE OREGON COAST DROPS SOUTH AND THE
HIGH PRESSURE CELL MOVES OFF TO THE EAST. MIGHT NEED ANOTHER DENSE
FOG ADVISORY FOR LATE TONIGHT/EARLY THURSDAY MORNING AS MODEL CROSS
SECTIONS ALONG COAST AND THROUGH INLAND VALLEYS SHOW RELATIVE
HUMIDITY AT OR NEAR 100% IN THE 300-1300 FT LAYER FROM 0100-0700 PST
THURSDAY. ADJUSTED  WEATHER GRIDS TO SHOW DENSE FOG THESE AREAS. THE
MODELS CONTINUE SOUTH TO SOUTHEAST FLOW IN THE LOWER 6000 FEET INTO
THURSDAY NIGHT. THIS LIFTS THE MARINE LAYER BACK TO AT LEAST 2000
FEET AND TEMPORARILY MOISTENS THE LOWER 6000 FEET...BUT THE AFORE
MENTIONED LOW IS STILL FORECAST BY ALL MODELS TO CONTINUE DIGGING
SOUTHWARD ALONG 127 DEGREES AND THE NORTHEAST FLOW INCREASES AGAIN
LATE THURSDAY NIGHT/FRIDAY MORNING AS THE LOW CROSSES SOUTH OF 30
DEGREES NORTH LATITUDE...CAUSING A DRYING TREND AND ANOTHER LOWERING
OF THE MARINE LAYER. DENSE FOG THURSDAY NIGHT WILL PROBABLY BE
CONFINED TO JUST THE LOWER INLAND VALLEYS. WITH THE HIGH PRESSURE
REBUILDING OVER THE GREAT BASIN FRIDAY...THE OFFSHORE PRESSURE
GRADIENTS ARE OF SIMILAR IF NOT SLIGHTLY STRONGER STRENGTH THAN THIS
MORNING...LIKEWISE WITH 5000-10000 FOOT NORTHEAST WINDS. HOWEVER THE
DIFFERENCE BEING THE DURATION IS LONGER DUE TO THE LOW BEING CUTOFF
AND MAINTAINING THE NORTHEAST FLOW...SO MARINE AIR SHOULD SCOUR OUT
OF VALLEYS ABOVE 1000 FEET AND STAY OUT THROUGH FRIDAY NIGHT

.LONG TERM...SUNDAY THROUGH NEXT WEDNESDAY...
WELL THE MAJORITY OF THE MEDIUM RANGE MODELS NOW SHOW THE LOW AFTER
CUTTING OFF...FORMING A REX BLOCK WITH THE LOW RETROGRADING FURTHER
OFFSHORE...CONSENSUS WITH SURROUNDING OFFICES IS THIS IS THE MOST
LIKELY FORECAST SCENARIO SO COLLABORATED BY LOWERING
POPS/DEWPOINTS/RELATIVE HUMIDITY/CLOUD COVER GRIDS...DROPPING CHANCE
OF RAIN FROM WEATHER GRIDS...AND RAISING TEMPERATURE GRIDS SLIGHTLY
TO ACCOUNT FOR A PROLONGED PERIOD OF PREDOMINATELY WEAK OFFSHORE
FLOW.

&&

.AVIATION...
032120Z...STRATUS HAS CLEARED FROM THE COAST AND SHOULD RETURN TO
THE COASTAL AIRPORTS LATE THIS AFTERNOON. VISIBILITIES WEST OF THE
MOUNTAINS WILL GENERALLY REMAIN BELOW 6 SM IN HZ. MARINE LAYER DEPTH
WILL DECREASE SLIGHTLY TONIGHT.VSBY WILL LOWER TONIGHT...WITH CIGS
RANGING FROM AROUND 800 TO 1100 FT MSL. INLAND EXTENT OF STRATUS
WILL NOT BE AS GREAT TONIGHT. STRATUS SHOULD START TO BREAK UP
AROUND 16Z INLAND AND AT 18Z NEAR THE COAST.

ABOVE THE MARINE LAYER...SCATTERED HIGH CLOUDS AT OR ABOVE FL200
AND UNRESTRICTED VISIBILITIES.

&&

$$

PUBLIC/FIRE WEATHER...BALFOUR
AVIATION/MARINE...SULLIVAN


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