Freeze Warning 2, NWS San Francisco Bay Area, CA

906 
WWUS76 KMTR 031721
NPWMTR

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
921 AM PST SAT JAN 3 2015

...TEMPERATURES WARMING ABOVE FREEZING...


CAZ506-507-510>512-516>518-528-031830-
/O.EXP.KMTR.FZ.W.0002.000000T0000Z-150103T1700Z/
NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS-
EAST BAY INTERIOR VALLEYS-EAST BAY HILLS AND DIABLO RANGE-
SANTA CRUZ MOUNTAINS-
SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO-
SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST-
MOUNTAINS OF SAN BENITO AND INTERIOR MONTEREY COUNTY INCLUDING
PINNACLES NATIONAL PARK-
NORTHERN SALINAS VALLEY...HOLLISTER VALLEY...AND CARMEL VALLEY-
921 AM PST SAT JAN 3 2015

...FREEZE WARNING HAS EXPIRED...

THE FREEZE WARNING IS NO LONGER IN EFFECT. TEMPERATURES HAVE
WARMED ABOVE FREEZING.


$$

CAZ508-513-031830-
/O.EXP.KMTR.FR.Y.0002.000000T0000Z-150103T1700Z/
SAN FRANCISCO BAY SHORELINE-
SANTA CLARA VALLEY...INCLUDING SAN JOSE-
921 AM PST SAT JAN 3 2015

...FROST ADVISORY HAS EXPIRED...

THE FROST ADVISORY IS NO LONGER IN EFFECT. TEMPERATURES HAVE
WARMED UP INTO THE UPPER 30S AND 40S AND WILL CONTINUE TO WARM
THIS MORNING.


$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
922 AM PST FRI JAN 2 2015

...FREEZING TEMPERATURES ACROSS INTERIOR PORTIONS OF THE AREA
EXPECTED AGAIN THIS MORNING...

.SYNOPSIS...FREEZING TEMPERATURES ARE POSSIBLE ONCE AGAIN LATE
TONIGHT AND SATURDAY MORNING. AN UPPER LEVEL RIDGE WILL BUILD
OVER THE AREA DURING THE WEEKEND AND RESULT IN GRADUAL WARMING.
DRY WEATHER IS EXPECTED TO PERSIST INTO THE EARLY PART OF NEXT
WEEK...WITH RAIN CHANCES DEVELOPING BY LATE WEDNESDAY OR THURSDAY.

&&

.DISCUSSION...AS OF 8:10 AM PST FRIDAY...ANOTHER CHILLY START TO
THE DAY WITH MANY LOCATIONS CLOSE TO THE VALUES THAT WERE HIT
YESTERDAY (SFOPNSMTR WITH ALL THE DETAILS). WILL ALLOW THE FROST
AND FREEZE PRODUCTS TO EXPIRE AT 9 AM. MAIN QUESTION FOR THE
FORECAST WILL BE LOWS FOR TONIGHT. SIMILAR TO YESTERDAY GUIDANCE
IS SHOWING WARMING THAT WOULD TAKE MOST LOCATIONS OUT OF FREEZE
CRITERIA FOR TONIGHT. HOWEVER...12Z SOUNDING FROM KOAK THIS
MORNING ACTUALLY SHOWS SLIGHT COOLING FROM THE SURFACE UP TO 800MB
MAKING THE WARMING GUIDANCE NUMBERS A BIT SUSPECT.

REST OF THE FORECAST APPEARS TO BE ON TRACK WITH A SLIGHT CHANCE TO
CHANCE FOR RAIN LATE WEDNESDAY INTO THURSDAY.

.PREVIOUS DISCUSSION...CLEAR SKIES AND DRY CONDITIONS ARE
RESULTING IN ANOTHER CHILLY NIGHT ACROSS THE DISTRICT WITH
TEMPERATURES DROPPING INTO THE LOWER 30S TO LOWER 40S. DEW POINT
TEMPERATURES ARE GENERALLY RUNNING A LITTLE WARMER THAN YESTERDAY
AT THIS TIME THUS...EXPECT MANY LOW TEMPERATURES TO BE SLIGHTLY
WARMER THAN THOSE ON THURSDAY...ALTHOUGH PLENTY OF FREEZING OR
NEAR FREEZING TEMPERATURES ARE EXPECTED. FROST ADVISORIES AND
FREEZE WARNINGS REMAIN IN EFFECT UNTIL 9 AM THIS MORNING. ALTHOUGH
WARMER TEMPERATURES ARE EXPECTED TONIGHT INTO SATURDAY
MORNING...THERE WILL LIKELY BE SOME INLAND AREAS THAT APPROACH
FREEZING.

AN UPPER RIDGE OVER THE EASTERN PACIFIC WILL CONTINUE TO APPROACH
THE COAST TODAY AND GRADUALLY MOVE OVER CALIFORNIA BY EARLY NEXT
WEEK. THIS RIDGE WILL BRING IN A WARMING TREND AND KEEP CONDITIONS
DRY. GRADUAL WARMING IS EXPECTED BY THE END OF THE WEEKEND AND
DAYTIME HIGHS ARE FORECAST TO BE MOSTLY IN THE 60S BY MONDAY.

THE MEDIUM RANGE MOSTLY MODELS AGREE THAT THE RIDGE WILL BEGIN TO
BREAK DOWN BY THE MIDDLE OF NEXT WEEK WHICH WILL ALLOW A PACIFIC
STORM SYSTEM TO POTENTIALLY BRING RAIN TO OUR AREA BY LATE
WEDNESDAY OR THURSDAY. PROJECTIONS ARE FOR MOSTLY LIGHT AMOUNTS
AND FOR THAT RAIN TO PRIMARILY BE FOCUSED ON THE NORTHERN PART OF
THE FORECAST AREA.

&&

.AVIATION...AS OF 09:20 AM PST FRIDAY...STATUS QUO...MOSTLY CLEAR
SKIES AND VFR CONDITIONS. THERE WAS SOME PATCHY FOG IN THE N BAY
LAST NIGHT AND THE POSSIBILITY WILL EXIST AGAIN TONIGHT FOR KSTS.
OTHER TERMINALS WILL BE VFR THROUGH THE PERIOD. ONE AREA OF
CONCERN IS THE STRATUS LURKING OFF THE COAST. LATEST GUIDANCE DOES
NOT BRING IT INLAND...WHICH MAKES SENSE GIVEN THE LINGERING N TO
NE FLOW AT 925MB.

VICINITY OF KSFO...VFR CONDITIONS WITH GENERALLY LIGHT WINDS.

CONFIDENCE IS HIGH.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...VFR WITH GENERALLY LIGHT WINDS AT
KMRY.

CONFIDENCE IS HIGH.

&&

.MARINE...AS OF 09:18 AM PST FRIDAY...LIGHT TO MODERATE WINDS WILL
PREVAIL OVER THE COASTAL WATERS THROUGH MUCH OF THE FORECAST AS
HIGH PRESSURE REMAINS IN PLACE. THE SEA STATE WILL BE GENTLE WITH
A WEST TO NORTHWEST SWELL WITH A MODERATE PERIOD.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TDAY...NONE.

PUBLIC FORECAST: BELL/SIMS
AVIATION/MARINE: MM

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HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
428 AM PST FRI JAN 2 2015

CAZ506>508-510>513-516>518-528-021700-
NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS-
SAN FRANCISCO BAY SHORELINE-EAST BAY INTERIOR VALLEYS-
EAST BAY HILLS AND DIABLO RANGE-SANTA CRUZ MOUNTAINS-
SANTA CLARA VALLEY...INCLUDING SAN JOSE-
SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO-
SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST-
MOUNTAINS OF SAN BENITO AND INTERIOR MONTEREY COUNTY INCLUDING
PINNACLES NATIONAL PARK-
NORTHERN SALINAS VALLEY...HOLLISTER VALLEY...AND CARMEL VALLEY-
428 AM PST FRI JAN 2 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SAN FRANCISCO BAY AREA AND
MONTEREY BAY AREA.

.DAY ONE...FRIDAY AND FRIDAY NIGHT

ANOTHER COLDER THAN NORMAL NIGHT CAN BE EXPECTED WITH MANY
INTERIOR LOCATIONS THURSDAY NIGHT EXPECTED TO BE NEAR OR SLIGHTLY
COOLER THAN FREEZING.

FROST ADVISORY FOR THE SAN FRANCISCO BAY SHORELINE PLUS THE SANTA
CLARA VALLEY UNTIL 9 AM.
FREEZE WARNING FOR THE NORTH BAY MOUNTAINS AND VALLEYS PLUS
SALINAS VALLEY...SAN BENITO COUNTY...AND THE SANTA LUCIAS UNTIL 9 AM.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

TEMPERATURES WILL MODERATE THROUGH THE PERIOD.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS PER STANDARD OPERATING PROCEDURES.