Freeze Warning 3, NWS San Francisco Bay Area, CA

872 
WWUS76 KMTR 041123
NPWMTR

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
323 AM PST SUN DEC 4 2011

CAZ516-041600-
/O.CON.KMTR.FZ.W.0003.000000T0000Z-111204T1600Z/
SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO-
323 AM PST SUN DEC 4 2011

...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING...

* TEMPERATURES: TEMPERATURES WILL CONTINUE TO DROP THROUGH SUNRISE
  SUNDAY MORNING. SEVERAL HOURS OF FREEZING TEMPERATURES ARE
  EXPECTED WITH OVERNIGHT LOWS IN THE MID 20S.

* IMPACTS: SENSITIVE VEGETATION WILL BE DAMAGED OR KILLED BY SUB-
   FREEZING TEMPERATURES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FREEZE WARNING MEANS SUB-FREEZING TEMPERATURES ARE IMMINENT OR
HIGHLY LIKELY. THESE CONDITIONS WILL KILL CROPS AND OTHER
SENSITIVE VEGETATION.

&&

$$

CAZ507-041615-
/O.NEW.KMTR.WI.Y.0009.111205T0900Z-111205T1600Z/
NORTH BAY MOUNTAINS-
323 AM PST SUN DEC 4 2011

...WIND ADVISORY IN EFFECT FROM 1 AM TO 8 AM PST MONDAY FOR THE
NORTH BAY MOUNTAINS...

* TIMING:SUNDAY NIGHT AFTER MIDNIGHT THROUGH MID-MORNING MONDAY.

* WINDS: NORTH WINDS OF 10 TO 20 MPH WILL INCREASE TO NORTHEAST 20
  TO 30 WITH GUSTS UP TO 50 MPH.

* IMPACTS: DOWNED TREES AND BRANCHES MAY CAUSE POWER OUTAGES.
  LOOSE OBJECTS NOT TIED DOWN MAY BLOW AROUND. DRIVING HIGH
  PROFILE VEHICLES WILL BE DIFFICULT AND POSSIBLY DANGEROUS. ANY
  STRUCTURE FIRE OR WILDFIRE COULD BE DIFFICULT TO SUPPRESS DUE TO
  THE STRONG WINDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$

BELL

852 
WWUS76 KMTR 041547
NPWMTR

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
747 AM PST SUN DEC 4 2011

CAZ516-041700-
/O.EXP.KMTR.FZ.W.0003.000000T0000Z-111204T1600Z/
SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO-
747 AM PST SUN DEC 4 2011

...FREEZE WARNING WILL EXPIRE AT 8 AM PST THIS MORNING...

THE FREEZE WARNING WILL EXPIRE AT 8 AM PST THIS MORNING. 

* IMPACTS: DAMAGE TO SENSITIVE MAY CONTINUE OVER THE NEXT HOUR.
  HOWEVER...TEMPERATURES ARE FORECAST TO RECOVER QUICKLY AS THE
  SUN RISES.

$$

CAZ507-050000-
/O.CON.KMTR.WI.Y.0009.111205T0900Z-111205T1600Z/
NORTH BAY MOUNTAINS-
747 AM PST SUN DEC 4 2011

...WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 8 AM PST MONDAY...

A WIND ADVISORY REMAINS IN EFFECT FROM 1 AM TO 8 AM PST MONDAY. 

* WINDS: NORTH WINDS OF 10 TO 20 MPH WILL INCREASE TO NORTHEAST 
  20 TO 30 WITH GUSTS UP TO 50 MPH. 

* IMPACTS: DOWNED TREES AND BRANCHES MAY CAUSE POWER OUTAGES. 
  LOOSE OBJECTS NOT TIED DOWN MAY BLOW AROUND. DRIVING HIGH 
  PROFILE VEHICLES WILL BE DIFFICULT AND POSSIBLY DANGEROUS. ANY 
  STRUCTURE FIRE OR WILDFIRE COULD BE DIFFICULT TO SUPPRESS DUE 
  TO THE STRONG WINDS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
902 PM PST SAT DEC 3 2011

.DISCUSSION...AS OF 9:00 PM PST SATURDAY...ANOTHER SUNNY DAY WITH
DRY OFFSHORE WINDS RESULTED IN AFTERNOON HIGHS THAT WERE AT LEAST
A FEW DEGREES ABOVE NORMAL. YET...TODAY'S TEMPERATURES WERE
ANYWHERE FROM 5 TO 12 DEGREES BELOW YESTERDAY'S RECORD-BREAKING
WARMTH DUE TO THE COOLER AIRMASS THAT SWEPT IN FROM THE NORTH LAST
NIGHT AND TODAY. BLUSTERY CONDITIONS CONTINUE IN THE HILLS OF THE
SAN FRANCISCO BAY AREA WITH LOCAL GUSTS AS HIGH AS 45 MPH AT 2000
FEET IN THE NORTH BAY. THE 00Z NAM APPEARS TO HAVE A GOOD HANDLE
ON THIS...MAINTAINING BREEZY CONDITIONS IN THE HILLS THROUGH
LATE EVENING...BEFORE GRADUALLY TAPERING WINDS OFF LATER TONIGHT
AND THROUGH THE DAY ON SUNDAY.

SURFACE DEWPOINTS ARE VERY LOW THIS EVENING...MOSTLY IN THE TEENS
AND 20S. THUS...ONCE THE WINDS DROP OFF LATER TONIGHT EXPECT
TEMPERATURES TO PLUMMET. MOS GUIDANCE HAS BEEN TOO COOL RECENTLY
WITH OVERNIGHT LOWS...ESPECIALLY FOR THE VALLEYS OF THE NORTH AND
EAST BAY. THE 00Z MOS GUIDANCE HAS TRENDED SLIGHTLY WARMER AND
BELIEVE MOST VALLEY LOCATIONS IN THE SF BAY AREA WILL REMAIN ABOVE
FREEZING OVERNIGHT WITH ONLY A FEW OF THE COLDEST SPOTS REACHING
THE FREEZING POINT BRIEFLY AROUND SUNRISE. FARTHER SOUTH...WHERE
WINDS HAVE ALREADY EASED...TEMPERATURES TONIGHT WILL BE COLDER.
MANY OF THE VALLEYS OF MONTEREY AND SAN BENITO COUNTY WILL LIKELY
SEE TEMPERATURES DROP TO AROUND FREEZING AND SOME OF THE COLDEST
SOUTHERN MONTEREY COUNTY VALLEYS MAY SEE TEMPERATURES DROP INTO
THE MID AND UPPER 20S BY DAYBREAK.

YET ANOTHER SHORTWAVE TROUGH IS FORECAST TO DROP SOUTH INTO THE
GREAT BASIN LATE SUNDAY AND SUNDAY NIGHT. THIS WILL RESULT IN
ANOTHER ROUND OF MODERATE OFFSHORE WINDS IN THE HILLS OF THE SF
BAY AREA LATE SUNDAY NIGHT AND INTO MONDAY MORNING...AND PERHAPS
LOCALLY STRONG NORTHEAST WINDS ACROSS THE NORTH BAY MOUNTAINS IF
THE NAM VERIFIES. A WIND ADVISORY WILL PROBABLY NOT BE NEEDED
GIVEN THAT THE SUNDAY NIGHT/MONDAY MORNING WIND EVENT IS EXPECTED
TO BE MARGINAL AND LOCALIZED. HOWEVER...FIRE WEATHER CONCERNS HAVE
BEEN INCREASING WITH EACH SUBSEQUENT DRY OFFSHORE WIND EVENT. IN
ADDITION...LITTLE OR NO RELATIVE HUMIDITY RECOVERY IS EXPECTED ON
SUNDAY NIGHT WHEN THE WINDS PICK UP YET AGAIN. DO NOT ANTICIPATE
THE NEED FOR A RED FLAG WARNING AT THIS TIME...BUT WILL ADVISE OF
INCREASED FIRE DANGER IN THE NORTH AND EAST BAY HILLS WITH A
HAZARDOUS WEATHER OUTLOOK.

THE DEEP UPPER TROUGH OVER THE GREAT BASIN AND SOUTHERN ROCKIES IS
FORECAST TO SHIFT EAST EARLY NEXT WEEK. THIS WILL ALLOW THE
OFFSHORE PRESSURE GRADIENTS TO RELAX. THEREFORE...WINDS ARE NOT
EXPECTED TO BE AN ISSUE AFTER MONDAY. THE UPPER RIDGE OFF THE WEST
COAST IS FORECAST TO REMAIN IN PLACE BETWEEN 130W AND 140W THROUGH
THE WEEK. THIS WILL MEAN CONTINUED SUNNY AND MILD DAYS AND CLEAR
AND COOL NIGHTS FOR OUR FORECAST AREA THROUGH THE WEEK...AND VERY
LIKELY INTO NEXT WEEKEND AS WELL.

&&

.AVIATION...AS OF 4:30 PM PST SATURDAY...UPPER LOW OVER NEVADA
PRODUCING STRONG NORTHEAST FLOW THAT WILL KEEP CLEAR VFR
CONDITIONS OVER THE AREA. WINDS GUSTING TO 20-25 KT POSSIBLE NEAR
THE NORTH AND EAST BAY HILLS THROUGH THE NIGHT.

VICINITY OF KSFO...VFR.

KSFO BRIDGE APPROACH...VFR.

MONTEREY BAY AREA TERMINALS...VFR.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TNGT...SCA...PT ARENA TO PIGEON PT 10-60 NM UNTIL 10 PM

&&

PUBLIC FORECAST: DYKEMA
AVIATION/MARINE: W PI

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
852 PM PST SAT DEC 3 2011

CAZ507-511-041400-
NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE-
852 PM PST SAT DEC 3 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NORTH BAY MOUNTAINS AND
THE EAST BAY HILLS.

.DAY ONE...SATURDAY NIGHT

GUSTY NORTHEAST WINDS WILL GRADUALLY DIMINISH OVERNIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

WINDS WILL CONTINUE TO DECREASE ON SUNDAY...BUT THEN INCREASE ONCE
AGAIN ON SUNDAY NIGHT. NORTHEAST WINDS OF 15 TO 25 MPH WITH GUSTS
AS HIGH AS 40 MPH ARE POSSIBLE IN THE NORTH BAY MOUNTAINS AND EAST
BAY HILLS LATE SUNDAY NIGHT INTO MONDAY MORNING. STRONGEST WINDS
ARE EXPECTED TO BE ABOVE 2000 FEET IN THE NORTH BAY MOUNTAINS. IN
ADDITION...THE AIRMASS OVER THE AREA WILL REMAIN VERY DRY WITH
LITTLE OR NO HUMIDITY RECOVERIES EXPECTED ON SUNDAY NIGHT. ANY
STRUCTURE FIRE OR WILDFIRE COULD BE DIFFICULT TO SUPPRESS DUE TO
THE STRONG WINDS.

.SPOTTER INFORMATION STATEMENT...

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

DYKEMA