Snow Advisory 2, NWS San Francisco Bay Area, CA

000 
WWUS46 KMTR 250012
WSWMTR

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
412 PM PST THU JAN 24 2008

CAZ507-511-512-517-518-250200-
/O.CON.KMTR.SN.Y.0002.000000T0000Z-080125T0200Z/
NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE-
SANTA CRUZ MOUNTAINS-
SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST-
MOUNTAINS OF SAN BENITO AND INTERIOR MONTEREY COUNTY INCLUDING
PINNACLES NATIONAL MONUMENT-
412 PM PST THU JAN 24 2008

...SNOW ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST THIS
AFTERNOON FOR THE MOUNTAINS OF THE SAN FRANCISCO AND MONTEREY
BAY AREAS...

A COLD STORM SYSTEM CENTERED NEAR THE CENTRAL CALIFORNIA COAST ON
THURSDAY AFTERNOON CONTINUED TO PRODUCE NUMEROUS RAIN AND SNOW
SHOWERS. SNOW WAS REPORTED IN THE MOUNTAINS AS LOW AS 1400 FEET.
AT MID AFTERNOON...SNOW WAS REPORTED AT THE SUMMIT OF HIGHWAY 17
IN THE SANTA CRUZ MOUNTAINS. SATELLITE AND RADAR DATA INDICATE
SCATTERED SHOWERS WILL CONTINUE IN THE MOUNTAINS FOR THE REMAINDER
OF THE AFTERNOON. LITTLE CHANGE IN SNOW LEVEL IS EXPECTED. SHOWERS
WILL TAPER OFF THIS EVENING.

A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL
DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED
VISIBILITIES...AND USE CAUTION WHILE DRIVING. MOTORISTS DRIVING
THROUGH MOUNTAIN PASSES ABOVE 1500 FEET CAN EXPECT SNOW AND SLIPPERY
ROADS THROUGH 6 PM.

$$

DYKEMA

000 
WWUS46 KMTR 250156
WSWMTR

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
556 PM PST THU JAN 24 2008

CAZ507-511-512-517-518-251700-
/O.EXT.KMTR.SN.Y.0002.000000T0000Z-080125T1700Z/
NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE-
SANTA CRUZ MOUNTAINS-
SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST-
MOUNTAINS OF SAN BENITO AND INTERIOR MONTEREY COUNTY INCLUDING
PINNACLES NATIONAL MONUMENT-
556 PM PST THU JAN 24 2008

...SNOW ADVISORY NOW IN EFFECT UNTIL 9 AM PST FRIDAY FOR THE
MOUNTAINS OF THE SAN FRANCISCO AND MONTEREY BAY AREAS...

THE SNOW ADVISORY FOR THE MOUNTAINS OF THE SAN FRANCISCO AND
MONTEREY BAY AREAS WAS DUE TO EXPIRE AT 6 PM THURSDAY. THE
SNOW ADVISORY HAS NOW BEEN EXTENDED UNTIL 9 AM FRIDAY.

LATEST SATELLITE AND RADAR DATA INDICATE SCATTERED SHOWERS WILL
CONTINUE THROUGH THE EVENING HOURS. SNOW SHOWERS HAVE BEEN REPORTED
AS LOW AS 1400 FEET IN THE SANTA CRUZ MOUNTAINS. THE NEXT WEATHER
SYSTEM WILL SPREAD MORE STEADY PRECIPITATION ACROSS THE AREA
BEGINNING LATE TONIGHT. SNOW LEVELS WITH THE NEXT WEATHER SYSTEM
WILL START OUT AT ABOUT 2000 FEET LATE TONIGHT...BUT WILL RISE
RAPIDLY TO ABOVE 3000 FEET BY LATE FRIDAY MORNING. ADDITIONAL SNOW
ACCUMULATIONS OF 1 TO 3 INCHES ARE POSSIBLE AT ELEVATIONS ABOVE
2000 FEET TONIGHT THROUGH EARLY FRIDAY MORNING.

A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL
DIFFICULTIES. SEVERAL HIGH ELEVATION ROADS IN THE SANTA CRUZ
MOUNTAINS WERE CLOSED DUE TO SNOW ON THURSDAY AFTERNOON. BE PREPARED
FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION
WHILE DRIVING. MOTORISTS DRIVING THROUGH MOUNTAIN PASSES ABOVE
1500 FEET CAN EXPECT SNOW AND SLIPPERY ROADS THROUGH EARLY FRIDAY
MORNING.

$$

DYKEMA

000 
WWUS46 KMTR 251516
WSWMTR

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
716 AM PST FRI JAN 25 2008

CAZ507-511-512-517-518-251630-
/O.CAN.KMTR.SN.Y.0002.000000T0000Z-080125T1700Z/
NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE-
SANTA CRUZ MOUNTAINS-
SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST-
MOUNTAINS OF SAN BENITO AND INTERIOR MONTEREY COUNTY INCLUDING
PINNACLES NATIONAL MONUMENT-
716 AM PST FRI JAN 25 2008

...SNOW ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS CANCELLED THE
SNOW ADVISORY. 

SNOW LEVELS ARE NOW ABOVE 3500 FEET AND WILL CONTINUE TO CLIMB TO
NEAR 5000 FEET AS A WARM FRONT MOVES ONTO THE COAST. DUE TO THE
RISING SNOW LEVELS THE SNOW ADVISORY HAS BEEN CANCELLED.

$$

R WALBRUN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
316 AM PST THU JAN 24 2008

...HEAVY RAIN LIKELY FRIDAY AND SATURDAY...

.DISCUSSION...SHOWER ACTIVITY HAS RAMPED UP OVER THE PAST SEVERAL
HOURS WITH NUMEROUS CELLS MOVING ACROSS THE SOUTHERN HALF OF THE
CWA FROM THE SOUTHWEST AT ABOUT 22 KNOTS. LIGHTNING DETECTION
NETWORKS HAVE PICKED UP A FEW STRIKES OFF THE BIG SUR COAST...AND
SOME OF THESE CELLS HAVE BEEN PRODUCING SMALL HAIL IN MONTEREY AS
WELL AS CARMEL. LOOKING AT SATELLITE IMAGERY...ENHANCEMENT ALONG THE
SOUTHERN EDGE OF THE UPPER LOW WILL SWING OVER OUR CWA THIS MORNING
AND INTENSIFY SHOWERS OVER THE DISTRICT...ESPECIALLY THE SOUTHERN
HALF. SNOW LEVELS REMAIN RELATIVELY LOW...BETWEEN 2000 AND 3000 FEET
THIS MORNING...THEN RISING BY TONIGHT.

THE UPPER LOW WILL FINALLY WEAKEN AND BECOME ABSORBED BY THE NEXT
UPPER LOW CURRENTLY LOCATED JUST WEST OF THE QUEEN CHARLOTTE ISLANDS.
THIS SECOND UPPER LOW IS PROGGED TO MOVE STRAIGHT SOUTH AND END UP
WEST OF SAN FRANCISCO BY FRIDAY MORNING. IN THIS POSITION...THE
SOUTHWEST FLOW ALOFT WILL ENTRAIN TROPICAL MOISTURE INTO THE MIX AND
PRODUCE POTENTIALLY HEAVY RAINFALL ACROSS AT LEAST THE SOUTHERN HALF
OF THE CWA. STRONG SOUTHWEST WINDS ABOVE THE SURFACE...OVER 50 KNOTS
AT 925 MB PER LATEST NAM GUIDANCE...WOULD SPELL ENHANCED OROGRAPHICS
SO COASTAL RANGES OF SANTA CRUZ AND MONTEREY COUNTIES COULD SEE
UPWARDS OF 3-6 INCHES DURING THE 24 HOUR PERIOD ENDING 12Z SATURDAY.
LOWER ELEVATIONS COULD RECEIVE 0.5-1.5 INCHES OF RAIN DURING THIS
TIME FRAME...PER THE LATEST QPF GUIDANCE FROM THE CNRFC. HEAVY RAINS
AND GUSTY SOUTHERLY WINDS TO CONTINUE INTO SATURDAY BEFORE THIS LOW
MOVES TO THE SOUTH AND EAST. SHOWERY CONDITIONS WILL CONTINUE ACROSS
THE DISTRICT THROUGH SUNDAY...HOWEVER...AS THE MAIN UPPER TROUGH
REMAINS OVER THE WEST. A DECREASED SHOWER THREAT IS INDICATED FOR
MOST OF NEXT WEEK PER MEDIUM RANGE MODEL SOLUTIONS...BUT THERE ARE
DIFFERENCES AMONGST THE MODEL SOLUTIONS...SO CONFIDENCE IS LOW.

&&

.AVIATION...PREVIOUS DISCUSSION...LIGHT EAST NORTHEASTERLY WINDS WILL
PERSIST THROUGH THIS EVENING. WINDS WILL BECOME SOUTHEASTERLY
OVERNIGHT AS A LOW PRESSURE SYSTEM SPINNING OFF THE CENTRAL
CALIFORNIA COAST MOVES EAST AND DISSIPATES. VFR TO MVFR CIGS AND
SCATTERED RAIN SHOWERS WILL CONTINUE THROUGH TONIGHT INTO THURSDAY AS
YET ANOTHER UPPER LOW DROPS DOWN AND SITUATES ITSELF OFF THE
CALIFORNIA COAST. THEREFORE ANTICIPATE SIMILAR CONDITIONS TO PERSIST
THROUGH THE END OF THE WEEK.

&&

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

&&

PUBLIC FORECAST: ANDERSON
AVIATION/MARINE: C WALBRUN

NWS ON THE WEB AT WEATHER.GOV/SANFRANCISCO

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
545 AM PST THU JAN 24 2008

CAZ507-511-512-517-518-251400-
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-
545 AM PST THU JAN 24 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR AREAS ABOVE 3000 FEET IN THE
SAN FRANCISCO AND MONTEREY BAY REGION.

.DAY ONE...THURSDAY

INTERMITTENT RAIN SHOWERS WITH SNOW SHOWERS ABOVE 3000 FEET WILL
CONTINUE TODAY. THUNDERSTORMS WITH SMALL HAIL ARE ALSO POSSIBLE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

PERIODS OF HEAVY RAIN WILL BE POSSIBLE FRIDAY THROUGH SATURDAY WHEN
LOCALIZED FLOODING WILL BE POSSIBLE ESPECIALLY IN THE MOUNTAINS OF
MONTEREY AND SANTA CRUZ COUNTIES. RAIN TOTALS MAY EXCEED 6 INCHES IN
THE WETTEST MOUNTAINS. THE HEAVIEST RAIN IS EXPECTED SOUTH OF THE SAN
FRANCISCO BAY AREA WITH THIS EVENT. IN ADDITION SOUTHERLY WINDS FROM
20 TO 35 MPH WILL BE POSSIBLE FRIDAY THROUGH SATURDAY AND COULD BRING
DOWN WEAKENED TREES OR POWER LINES.

RAIN WILL LINGER THROUGH SUNDAY BEFORE SOME DRYING ARRIVES BY EARLY
NEXT WEEK. STAY TUNED FOR THE LATEST STATEMENTS REGARDING THE
UPCOMING WET WEATHER.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS PER STANDARD OPERATING PROCEDURES. PLEASE REPORT ANY SNOW
ACCUMULATIONS.

CAZ006-505-506-508>510-513>516-251400-
BIG SUR COAST-
SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO-
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
NORTH BAY INTERIOR VALLEYS-SAN FRANCISCO BAY SHORELINE-
EAST BAY INTERIOR VALLEYS-SAN FRANCISCO PENINSULA COAST-
SANTA CLARA VALLEY INCLUDING SAN JOSE-
MONTEREY BAY/NORTHERN SALINAS VALLEY/HOLLISTER VALLEY AND CARMEL
VALLEY-
545 AM PST THU JAN 24 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE SAN FRANCISCO AND
MONTEREY BAY AREAS BELOW 3000 FEET IN ELEVATION.

.DAY ONE...THURSDAY

NUMEROUS SHOWERS WILL CONTINUE TODAY ALONG WITH POSSIBLE
THUNDERSTORMS CONTAINING SMALL HAIL.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

PERIODS OF RAIN...HEAVY AT TIMES ARE FORECAST FRIDAY THROUGH
SATURDAY. THE HEAVIEST RAIN IS EXPECTED FROM SAN FRANCISCO BAY
SOUTHWARD BUT LOCALIZED URBAN FLOODING WILL BE POSSIBLE THROUGHOUT
THE REGION DURING THIS PERIOD AS 1-3 INCHES OF RAIN WILL BE POSSIBLE
IN THE VALLEYS. IN ADDITION TO THE HEAVY RAIN STRONG SOUTHERLY WINDS
WILL BE POSSIBLE...ESPECIALLY ALONG THE COAST AND IN FAVORED VALLEY
LOCATIONS SUCH AS THE SANTA CLARA AND SALINAS VALLEYS WHERE WIND
SPEEDS TO 35 MPH WILL BE POSSIBLE FRIDAY AND SATURDAY.

RAIN WILL TAPER OFF BY SUNDAY WITH SOME DRYING POSSIBLE BY EARLY
NEXT WEEK.

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