Freeze Warning 1, NWS San Francisco Bay Area, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA CA
945 AM PST TUE DEC 16 2008

.DISCUSSION...AS OF 9:15 AM PST TUESDAY...VERY ACTIVE MORNING SO FAR
WITH PLENTY OF SNOW REPORTS...SMALL HAIL...AND NUMEROUS MARINE
WARNINGS FOR ROTATION IN THE CELLS OFFSHORE. SFC OBS INDC ESE LOW
LEVEL WINDS...WHICH IS CONFIRMED BY THE COASTAL PROFILERS. THIS LOW
LEVEL SHEAR HAS CONTRIBUTED TO THE RIGHT MOVING LOW TOPPED SUPERCELLS
OFF THE COAST...AND ROTATION HAS BEEN SEEN IN THE SRM RADAR PRODUCTS.
THEREFORE...THERE HAVE BEEN A SIGNIFICANT NUMBER OF SPECIAL MARINE
WARNINGS ISSUED THIS MORNING. SNOW REPORTS HAVE INCLUDED 2 TO 4
INCHES OF SNOW IN THE SANTA CRUZ MOUNTAINS...WITH A MIX OF RAIN/SNOW
EARLY THIS MORNING INTO THE HOLLISTER VALLEY AS WELL AS THE NORTH BAY
VALLEYS.

SATL IMAGERY INDC THAT THE UPPER LOW IS WEST OF THE NORTHERN CA
COAST...MOVING SLOWLY SOUTH. LOOKS LIKE A VORT LOBE WILL BE ROTATING
INTO THE DISTRICT TODAY...MAINLY AFFECTING AREAS SOUTH OF THE GOLDEN
GATE. THEREFORE...HAVE EXTENDED THE WINTER WEATHER ADVISORY THROUGH
THE AFTERNOON FOR THE MOUNTAINS SOUTH OF SAN FRANCISCO. FCST HAS BEEN
UPDATED FOR THE EXTENSION OF THE WINTER WEATHER ADVISORY. AS SKIES
CLEAR TONIGHT...TEMPS WILL TAKE A DIVE WITH THE COLD AIRMASS IN
PLACE. WILL MOST LIKELY BE ISSUING A FREEZE WARNING FOR PORTIONS OF
THE DISTRICT TONIGHT AND WEDNESDAY MORNING.

MEDIA AND SPOTTERS PLEASE LET US KNOW OF ANY SNOW AND OR LARGE HAIL
REPORTS. THANKS.

&&

.AVIATION...AS OF 9:45 AM PST TUESDAY...SCATTERED SHOWERS AND
THUNDERSTORMS WILL CONTINUE ACROSS OUR AREA THROUGH THE EARLY
AFTERNOON HOURS WITH CIGS STAYING MOSTLY OVER 3KFT. ALTHOUGH WIND
WILL GENERALLY NOT BE AN ISSUE TODAY...SOME OF THE STORMS MAY
PRODUCE SMALL HAIL AND BRIEF HEAVY RAIN. BY LATER IN THE AFTERNOON
THE WINDS WILL START TO SWITCH TO MORE NORTH TO NORTHEAST WHICH WILL
HELP TO DRY OUT THE AREA. FOG IS EXPECTED OVER THE NORTH BAY
VALLEYS THROUGH MUCH OF THE NIGHT. FOR OTHER LOCATIONS...FOG DOES
NOT APPEAR LIKELY AT THIS TIME.
&&

.MARINE...AS OF 9:45 AM PST TUESDAY...MARINERS ARE URGED TO USE
EXTREME CAUTION TODAY AS SOME OF THE SHOWERS AND THUNDERSTORMS OVER
THE WATERS MAY CONTAIN SMALL HAIL...HEAVY RAIN...AND
WATERSPOUTS. NUMEROUS MARINE WEATHER STATEMENTS (SFOMWSMTR) HAVE
BEEN ISSUED SO FAR WITH MORE EXPECTED THROUGH THE EARLY AFTERNOON.
CONDITIONS WILL IMPROVE BY LATE IN THE AFTERNOON.
&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TDA...WINTER WEATHER ADVISORY FOR TIL 10 AM FOR THE NORTH BAY
            VALLEYS AND NORTH BAY MOUNTAINS ABOVE 1000 FEET.
         ...WINTER WEATHER ADVISORY TIL 4 PM FOR THE MOUNTAINS SOUTH
            OF THE GOLDEN GATE ABOVE 1000 FEET IN ELEVATION.
     .TNGT...FREEZE WATCH FOR THE NORTH BAY VALLEYS.

&&

PUBLIC FORECAST: MHS
AVIATION/MARINE: BELL

NWS ON THE WEB AT WEATHER.GOV/SANFRANCISCO

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA CA
600 AM PST TUE DEC 16 2008

CAZ006-505-508>510-513-516-528>530-161900-
SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO-
SAN FRANCISCO-
COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO BAY SHORELINE-EAST BAY INTERIOR VALLEYS-
SAN FRANCISCO PENINSULA COAST-
NORTHERN SALINAS VALLEY...HOLLISTER VALLEY...AND CARMEL VALLEY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-NORTHERN MONTEREY BAY-
SANTA CLARA VALLEY...INCLUDING SAN JOSE-
600 AM PST TUE DEC 16 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COAST AND VALLEYS OF THE
SAN FRANCISCO BAY AREA EXCEPT FOR THE NORTH BAY VALLEYS.

.DAY ONE...TUESDAY

SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE TODAY. SOME OF THE
HEAVIER SHOWERS AND THUNDERSTORMS WILL PRODUCE BRIEF HEAVY DOWNPOURS
AND ALSO CONTAIN SMALL HAIL. HEAVY SHOWERS AND HAIL WILL PRODUCE
HAZARDOUS DRIVING CONDITIONS...MOTORISTS SHOULD SLOW DOWN AND ALLOW
EXTRA TIME TO REACH THEIR DESTINATIONS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

VERY COOL WEATHER WILL CONTINUE THROUGH THE WEEK. OVERNIGHT LOWS
ON WEDNESDAY MORNING MAY DROP BELOW FREEZING FOR SEVERAL HOURS IN
SOME OF THE COLDEST INLAND VALLEY LOCATIONS. THERE WILL BE ANOTHER
CHANCE OF SHOWERS BY LATER THURSDAY AND FRIDAY AND THEN AGAIN BY
ABOUT MONDAY.

.SPOTTER INFORMATION STATEMENT...

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

CAZ507-511-512-517-518-161900-
SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST-
MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY
INCLUDING PINNACLES NATIONAL MONUMENT-NORTH BAY MOUNTAINS-
EAST BAY HILLS AND THE DIABLO RANGE-SANTA CRUZ MOUNTAINS-
600 AM PST TUE DEC 16 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE SAN FRANCISCO BAY AREA
AND MONTEREY BAY AREA HILLS ABOVE 1000 FEET

.DAY ONE...TUESDAY

A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM THIS MORNING.

A COLD WEATHER SYSTEM WILL CONTINUE TO SPREAD RAIN AND SNOW SHOWERS
AS WELL AS ISOLATED THUNDERSTORMS ACROSS THE REGION TODAY. SNOW
LEVELS WILL BE AROUND 1000 FEET. 1 TO 2 INCHES OF SNOW MAY FALL
ABOVE 1500 FEET IN THE MOUNTAINS...WITH LOCALLY HIGHER AMOUNTS ACROSS
THE HIGHEST PEAKS ACROSS THE REGION.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

MAINLY DRY BUT COOL TO COLD WEATHER WILL PERSIST WEDNESDAY INTO
THURSDAY WITH FREEZING TEMPERATURES IN THE HILLS. BY THURSDAY NIGHT
AND FRIDAY THERE WILL BE ANOTHER CHANCE OF SHOWERS. ANOTHER STORM
WILL BRING THE NEXT CHANCE OF SHOWERS BY ABOUT MONDAY.

.SPOTTER INFORMATION STATEMENT...

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

CAZ506-161900-
NORTH BAY INTERIOR VALLEYS-
600 AM PST TUE DEC 16 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NORTH BAY VALLEYS

.DAY ONE...TUESDAY

A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM THIS MORNING.

A FREEZE WATCH IS IN EFFECT FROM 10 PM THIS EVENING THROUGH 9 AM
WEDNESDAY MORNING FOR THE NORTH BAY VALLEYS.

A MIX OF RAIN AND SNOW SHOWERS WILL CONTINUE THIS MORNING WITH
PATCHY ICE AND LIGHT SNOW ACCUMULATIONS POSSIBLE DOWN TO THE VALLEY
FLOORS. SHOWERS WILL SLOWLY DECREASE BY THIS EVENING. AS SKIES CLEAR
OUT TONIGHT FREEZING TEMPERATURES WILL DEVELOP...PROMPTING THE
ISSUANCE OF FREEZE WATCH LATE TONIGHT THROUGH WEDNESDAY MORNING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

VERY COOL WEATHER WILL CONTINUE THROUGH THE WEEK. OVERNIGHT LOWS
ON WEDNESDAY MORNING MAY DROP BELOW FREEZING FOR SEVERAL HOURS IN
SOME OF THE COLDEST INLAND VALLEY LOCATIONS. THERE WILL BE ANOTHER
CHANCE OF SHOWERS BY LATER THURSDAY AND FRIDAY AND THEN AGAIN BY
ABOUT MONDAY.

.SPOTTER INFORMATION STATEMENT...

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