Special Marine Warning 21, NWS San Francisco Bay Area, CA

990 
FZUS76 KMTR 210313
MWSMTR

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
713 PM PST THU NOV 20 2014

PZZ531-210322-
/O.EXP.KMTR.MA.W.0021.000000T0000Z-141121T0315Z/
713 PM PST THU NOV 20 2014

...SPECIAL MARINE WARNING WILL EXPIRE AT 715 PM PST...

THE STORM IS WEAKENING WITH LEFT OVER SHOWERS ACROSS THE SOUTH SAN
FRANCISCO BAY CONTINUING TO MOVE INTO THE EAST BAY SHORELINE.

THE AFFECTED AREA WAS...
SAN FRANCISCO BAY SOUTH OF THE BAY BRIDGE OVER PACIFIC WATERS...

LAT...LON 3760 12214 3771 12239 3780 12235 3775 12225
      3775 12220 3773 12220 3774 12225 3771 12222
      3772 12219 3769 12218 3767 12216
TIME...MOT...LOC 0312Z 289DEG 12KT 3767 12211

$$

RWW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
412 PM PST THU NOV 20 2014

.SYNOPSIS...LOOK FOR SCATTERED SHOWER TO CONTINUE AT LEAST THROUGH
THE EVENING WITH THUNDERSTORMS ALSO POSSIBLE. UNSETTLED
CONDITIONS WILL CONTINUE THROUGH SATURDAY WHEN
ANOTHER...POTENTIALLY STRONGER SYSTEM MOVES ACROSS OUR AREA
STARTING FRIDAY EVENING IN THE NORTH BAY AND THEN ACROSS OUR
ENTIRE AREA FRIDAY NIGHT INTO SATURDAY. DRY WEATHER IS THEN
FORECAST THROUGH AT LEAST THANKSGIVING DAY.

&&

.DISCUSSION...AS OF 3:00 PM PST THURSDAY...FORECAST CONTINUES TO
BE ON TRACK THIS AFTERNOON AS THE MAIN BAND OF RAIN IS PUSHING
ACROSS OUR CWA AND ADVANCING TO THE SOUTHEAST. RADAR RETURNS HAVE
NOT BEEN THAT IMPRESSIVE, ALTHOUGH IN THE LAST 30 MINUTES A
STRONGER CELL DID POP UP WEST OF BODEGA BAY THAT PROMPTED A MARINE
WEATHER STATEMENT TO BE ISSUED. FOR THE REST OF THE AFTERNOON INTO
THE EVENING THE MORE UNSTABLE AIR (THAT TRIGGERED THE CELL OVER
THE NORTHERN WATERS PLUS OFF THE EKA COAST) WILL CONTINUE TO
PROGRESS TO THE SOUTH. DECIDED TO INCREASE THE MENTION OF THUNDER
IN THE GRIDS TO MOST OF THE NORTHERN HALF OF THE CWA.

RAINFALL AMOUNTS SO FAR HAVE RANGED FROM OVER AN INCH FOR PARTS OF
THE NORTH BAY MOUNTAINS TO 1/3"-2/3" FOR A GOOD PORTION OF THE SF
BAY REGION, WITH LESSER AMOUNTS TO THE SOUTH. RADAR DOES SHOW A
NICE BAND CURRENTLY APPROACHING THE MONTEREY COASTLINE, SO NUMBERS
DOWN THERE SHOULD NICELY INCREASE BEFORE THE EVENING IS OVER.

AFTER ABOUT A 24 HOUR BREAK, ANOTHER PACIFIC STORM SYSTEM ASSOCIATED
WITH WILL MOVE TO OUR AREA STARTING FRIDAY EVENING FOR THE NORTH
BAY, CONTINUING THROUGH THE SF REGION FRIDAY NIGHT, AND DOWN TO
MONTEREY BAY AREA SATURDAY MORNING TO EARLY AFTERNOON. CURRENT
RAINFALL FORECAST IS CLOSE TO THE AMOUNTS WE ARE SEEING TODAY,
ALTHOUGH WITH PW VALUES FORECAST TO APPROACH 1.5" AT THE COAST,
STILL LOOKS LIKE THERE IS A POSSIBILITY OF HIGHER VALUES BEING HIT.
INSTABILITY DOES APPEAR TO BE LESS WITH THE SECOND STORM COMPARED
TO TODAY, SO AT THIS TIME THUNDERSTORMS ARE NOT FORECAST. RAIN
WILL END BY SATURDAY EVENING.

DRY WEATHER WILL RETURN TO OUR AREA FOR NEXT WEEK AS A RIDGE OF
HIGH PRESSURE RETURNS TO OUR CWA. TEMPERATURES WILL WARM BACK TO
ABOVE NORMAL VALUES. ALSO, THANKSGIVING DAY AT THIS TIME STILL
LOOKS DRY.

&&

.AVIATION...AS OF 4:12 PM PST THURSDAY...FOR 00Z TAFS. INITIAL
BAND OF PRECIP HAS MOVED ONSHORE BUT THERE ARE PLENTY OF SHOWERS
STILL OVER THE BAY AREA WITH MORE DEVELOPING OFFSHORE. WINDS AT
THE BUOYS AND TERMINALS ARE STILL SOUTHEAST BUT SHOULD SHIFT BY
03-04Z. VCTS WAS KEPT IN BAY AREA TAFS TIL 03Z AND GIVEN CURRENT
RADAR RETURNS THAT STILL SEEMS PLAUSIBLE WITH MOST ACTIVE CELLS
CURRENTLY NEAR POINT REYES. CLEARING WILL BE GRADUAL OVERNIGHT AND
ENOUGH BOUNDARY LAYER MOISTURE LEFT OVER TO EXPECT SOME MVFR CIGS
TO START THE DAY FRIDAY. MEDIUM CONFIDENCE.

VICINITY OF KSFO...ANOTHER BAND OF SHOWERS AND POSSIBLE T-STORMS
THROUGH 03Z...AFTER WHICH WINDS SHOULD SHIFT TO WESTERLY WITH
PRECIP ENDING.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...-SHRA THROUGH THIS EVENING ROUGHLY
03-04Z. THEN LIGHT WESTERLY AND GRADUAL CLEARING OVERNIGHT.

&&

.MARINE...AS OF 3:48 PM PST THURSDAY...NORTHWESTERLY WINDS WILL
RETURN TO THE COASTAL WATERS TONIGHT BEHIND THE FRONTAL BOUNDARY
THAT IS MOVING ACROSS THE REGION. THE CHANCE OF RAIN WILL CONTINUE
THROUGH TONIGHT WITH A SLIGHT CHANCE OF THUNDERSTORMS MAINLY
THROUGH THIS EVENING. SOUTHERLY WINDS WILL DEVELOP AGAIN FRIDAY AS
A STRONGER SYSTEM PASSES TO OUR NORTH BEFORE MOVING SOUTHWARD OVER
THE WATERS SATURDAY WITH RAIN AND INCREASING WINDS.

&&

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

PUBLIC FORECAST: BELL
AVIATION: RWW
MARINE: CW

VISIT US AT WEATHER.GOV/SANFRANCISCO

FOLLOW US ON FACEBOOK, TWITTER, AND YOUTUBE AT:
WWW.FACEBOOK.COM/NWSBAYAREA
WWW.TWITTER.COM/NWSBAYAREA
WWW.YOUTUBE.COM/NWSBAYAREA

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
553 PM PST THU NOV 20 2014

CAZ508-509-512-210215-
SAN FRANCISCO BAY SHORELINE CA-SAN FRANCISCO PENINSULA COAST CA-SANTA
CRUZ MOUNTAINS CA-
553 PM PST THU NOV 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR SAN MATEO COUNTY UNTIL 615 PM
PST...

AT 550 PM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
TWO STRONG THUNDERSTORMS OFF THE SAN MATEO COUNTY COAST. THESE
STORMS WERE MOVING EAST AT 15 MPH.

THESE STORMS HAVE THE POTENTIAL OF PRODUCING HEAVY DOWNPOURS AND
SMALL HAIL...AS WELL AS BRIEF GUSTY WINDS.

AREAS AFFECTED BY THIS STORM INCLUDE...PESCADERO...SAN GREGORIO...LA
HONDA...WOODSIDE AND PORTOLA VALLEY. IN ADDITION...THESE STORMS WILL
AFFECT MOTORISTS DRIVING ON HIGHWAY 1 AND HIGHWAY 84.

LAT...LON 3757 12252 3758 12241 3748 12225 3724 12217
      3720 12240 3730 12242 3736 12241 3743 12245
      3748 12246 3749 12250 3752 12253
TIME...MOT...LOC 0151Z 292DEG 10KT 3736 12245

DYKEMA

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
614 PM PST THU NOV 20 2014

CAZ512-529-530-210245-
NORTHERN MONTEREY BAY CA-SANTA CRUZ MOUNTAINS CA-SOUTHERN MONTEREY
BAY AND BIG SUR COAST CA-
614 PM PST THU NOV 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEAST SANTA CRUZ AND EXTREME
NORTHERN MONTEREY COUNTIES UNTIL 645 PM PST...

AT 610 PM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR WATSONVILLE...MOVING SOUTHEAST AT 15 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE HEAVY DOWNPOURS...SMALL HAIL
AND GUSTY WINDS.

AREAS AFFECTED BY THIS STORM INCLUDE...WATSONVILLE...FREEDOM...AND
PAJARO.

LAT...LON 3688 12184 3694 12187 3696 12190 3697 12194
      3698 12194 3706 12189 3691 12166 3683 12179
TIME...MOT...LOC 0212Z 296DEG 12KT 3694 12183

DYKEMA

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
621 PM PST THU NOV 20 2014

CAZ509-512-210300-
SAN FRANCISCO PENINSULA COAST CA-SANTA CRUZ MOUNTAINS CA-
621 PM PST THU NOV 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN SAN MATEO COUNTY UNTIL
700 PM PST...

AT 620 PM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR SAN GREGORIO...MOVING SOUTHEAST AT 10 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE HEAVY DOWNPOURS...SMALL HAIL
AND GUSTY WINDS.

AREAS AFFECTED BY THIS STORM INCLUDE...PESCADERO...ANO NEUVO STATE
RESERVE...SAN GREGORIO...AND LA HONDA.

LAT...LON 3747 12244 3729 12217 3719 12234 3712 12230
      3710 12233 3712 12235 3714 12235 3715 12237
      3716 12237 3720 12242 3727 12243 3736 12241
      3743 12245
TIME...MOT...LOC 0219Z 308DEG 9KT 3731 12242

DYKEMA