Small Craft Advisory 253, NWS San Francisco Bay Area, CA

611 
WHUS76 KMTR 172139
MWWMTR

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
239 PM PDT TUE MAY 17 2011

PZZ570-180545-
/O.EXB.KMTR.SC.Y.0252.110518T2100Z-110519T1200Z/
WATERS FROM PT. ARENA TO PIGEON PT. CA FROM 10 TO 60 NM-
239 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM WEDNESDAY TO 5 AM PDT
THURSDAY...

THE NATIONAL WEATHER SERVICE SAN FRANCISCO HAS ISSUED A SMALL
CRAFT ADVISORY...WHICH IS IN EFFECT FROM 2 PM WEDNESDAY TO 5 AM
PDT THURSDAY. 

* WINDS: NORTHWESTERLY WINDS WILL INCREASE TO 15 TO 25 KNOTS WEDNESDAY
  AFTERNOON.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

PZZ540-180545-
/O.EXB.KMTR.SC.Y.0252.110518T2100Z-110519T1200Z/
POINT ARENA TO POINT REYES TO 10 NM-
239 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM WEDNESDAY TO 5 AM PDT
THURSDAY...

THE NATIONAL WEATHER SERVICE SAN FRANCISCO HAS ISSUED A SMALL
CRAFT ADVISORY...WHICH IS IN EFFECT FROM 2 PM WEDNESDAY TO 5 AM
PDT THURSDAY. 

* WINDS: NORTHWESTERLY WINDS WILL INCREASE TO 15 TO 25 KNOTS WEDNESDAY
  AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

PZZ545-180545-
/O.EXB.KMTR.SC.Y.0252.110518T2100Z-110519T1200Z/
POINT REYES TO PIGEON POINT TO 10 NM-
239 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM WEDNESDAY TO 5 AM PDT
THURSDAY...

THE NATIONAL WEATHER SERVICE SAN FRANCISCO HAS ISSUED A SMALL
CRAFT ADVISORY...WHICH IS IN EFFECT FROM 2 PM WEDNESDAY TO 5 AM
PDT THURSDAY. 

* WINDS: NORTHWESTERLY WINDS WILL INCREASE TO 15 TO 25 KNOTS WEDNESDAY
  AFTERNOON.



PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

PZZ575-180545-
/O.EXT.KMTR.SC.Y.0252.110518T0900Z-110519T1200Z/
WATERS FROM PIGEON PT. TO PT. PIEDRAS BLANCAS CA FROM 10 TO 60 NM-
239 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY NOW IN EFFECT FROM 2 AM WEDNESDAY TO 5 AM
PDT THURSDAY...

THE SMALL CRAFT ADVISORY IS NOW IN EFFECT FROM 2 AM WEDNESDAY TO
5 AM PDT THURSDAY. 

* WINDS: WESTERLY WINDS WILL INCREASE TO 15 TO 25 KNOTS 
  TONIGHT...AND CONTINUE THROUGH AT LEAST THURSDAY MORNING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

PZZ530-180545-
/O.CON.KMTR.SC.Y.0253.000000T0000Z-110518T0900Z/
SAN FRANCISCO/SAN PABLO/SUISUN BAYS AND THE WEST DELTA-
239 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 2 AM PDT
WEDNESDAY...

A SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 2 AM PDT
WEDNESDAY. 

* WINDS: S WINDS 15 TO 25 KT WITH OCCASIONAL GALE FORCE GUSTS TO
  35 KT...WINDS DECREASING TO 5 TO 15 KT AFTER MIDNIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$


HTTP://WWW.WEATHER.GOV/SANFRANCISCO

570 
WHUS76 KMTR 180324
MWWMTR

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
824 PM PDT TUE MAY 17 2011

PZZ530-180900-
/O.CON.KMTR.SC.Y.0253.000000T0000Z-110518T0900Z/
SAN FRANCISCO/SAN PABLO/SUISUN BAYS AND THE WEST DELTA-
824 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 2 AM PDT
WEDNESDAY...

A SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 2 AM PDT
WEDNESDAY. 

* WINDS: S WINDS 15 TO 25 KT WITH OCCASIONAL GALE FORCE GUSTS TO 
  35 KT...WINDS DECREASING TO 5 TO 15 KT AFTER MIDNIGHT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

PZZ575-181130-
/O.CON.KMTR.SC.Y.0252.110518T0900Z-110519T1200Z/
WATERS FROM PIGEON PT. TO PT. PIEDRAS BLANCAS CA FROM 10 TO 60 NM-
824 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 2 AM WEDNESDAY TO
5 AM PDT THURSDAY...

A SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 2 AM WEDNESDAY TO
5 AM PDT THURSDAY. 

* WINDS: WESTERLY WINDS WILL INCREASE TO 15 TO 25 KNOTS 
  TONIGHT...AND CONTINUE THROUGH AT LEAST THURSDAY MORNING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

PZZ570-181130-
/O.CON.KMTR.SC.Y.0252.110518T2100Z-110519T1200Z/
WATERS FROM PT. ARENA TO PIGEON PT. CA FROM 10 TO 60 NM-
824 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 2 PM WEDNESDAY TO
5 AM PDT THURSDAY...

A SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 2 PM WEDNESDAY TO
5 AM PDT THURSDAY. 

* WINDS: NORTHWESTERLY WINDS WILL INCREASE TO 15 TO 25 KNOTS 
  WEDNESDAY AFTERNOON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

PZZ540-181130-
/O.CON.KMTR.SC.Y.0252.110518T2100Z-110519T1200Z/
POINT ARENA TO POINT REYES TO 10 NM-
824 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 2 PM WEDNESDAY TO
5 AM PDT THURSDAY...

A SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 2 PM WEDNESDAY TO
5 AM PDT THURSDAY. 

* WINDS: NORTHWESTERLY WINDS WILL INCREASE TO 15 TO 25 KNOTS 
  WEDNESDAY AFTERNOON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

PZZ545-181130-
/O.CON.KMTR.SC.Y.0252.110518T2100Z-110519T1200Z/
POINT REYES TO PIGEON POINT TO 10 NM-
824 PM PDT TUE MAY 17 2011

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 2 PM WEDNESDAY TO
5 AM PDT THURSDAY...

A SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 2 PM WEDNESDAY TO
5 AM PDT THURSDAY. 

* WINDS: NORTHWESTERLY WINDS WILL INCREASE TO 15 TO 25 KNOTS 
  WEDNESDAY AFTERNOON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS... ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$


HTTP://WWW.WEATHER.GOV/SANFRANCISCO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
441 AM PDT TUE MAY 17 2011

.DISCUSSION...AS OF 4:00 AM PDT TUESDAY...FORECAST FOCUS FOR TODAY
WILL DEAL WITH ONGOING SHOWERS THIS MORNING THAT ARE EXPECTED TO
BECOME MORE NUMEROUS LATER THIS AFTERNOON AND EVENING. DRY WEATHER
RETURNS WEDS AFTERNOON AND INTO THE WEEKEND.

IN GENERAL YESTERDAYS SYSTEM DIDNT DROP AS MUCH RAIN AS EXPECTED
BUT SOME DAILY RAINFALL RECORDS WERE SET.  DOWNTOWN SF TIED ITS
RECORD WITH 0.22 INCHES...TYING THE RECORD FOR THE DATE GOING BACK
TO 1996. OAKLAND AIRPORT WHICH HAS DATA BACK TO 1948 SET A RECORD
FOR THE DAY WITH 0.24 INCHES.

ANYWAY FOR TODAY WE STILL HAVE LINGERING SHOWERS THIS MORNING.
THERE IS AMPLE MOISTURE LEFT OVER FROM YESTERDAYS SYSTEM WHERE
OROGRAPHICS WERE HURT BY THE SE WIND FLOW AROUND THE WELL DEFINED
SFC LOW WEST OF THE GOLDEN GATE. LATER THIS AFTERNOON A SHORTWAVE
TROUGH WILL MAKE A BEELINE TOWARDS THE BAY AREA. THEREFORE EXPECT
SHOWERS TO BECOME MORE NUMEROUS THIS AFTERNOON. YESTERDAY WAS A
WARM ADVECTION DRIVEN RAIN... AND TODAY'S WILL BE COLD ADVECTION
WITH MUCH STEEPER LAPSE RATES ALOFT. NUMEROUS SHOWERS FORECAST
THROUGH ABOUT 06Z TONIGHT BEFORE DECREASING OVERNIGHT. WOULDN'T BE
SURPRISED IF MANY PLACES FROM SF SOUTHWARD SEE HIGHER RAIN TOTALS
WITH THIS WEAKER SYSTEM AS NW ONSHORE WINDS ARE OFTEN BETTER RAIN
PRODUCERS. HOWEVER...SIMILAR TO YESTERDAY THE MODELS ARE SPINNING A
A SFC LOW (1006 MB) NEAR HALF MOON BAY AS THE UPPER JET AND TROUGH
AXIS PASSES OVERHEAD. EITHER WAY SHOWER ACTIVITY WILL BE ON THE
DECREASE AFTER MIDNIGHT.

FOR WEDS HAVE LEFT SOME ISOLATED/SCATTERED SHOWERS FOR EASTERN AND
SOUTHERN PORTIONS OF THE DISTRICT THROUGH 18Z...WITH THE BEST
CHANCE ACROSS MONTEREY AND SAN BENITO COUNTY EARLY WEDS MORNING.

OTHERWISE EXPECT MUCH WARMER TEMPS BY WEDS AFTERNOON (BUT STILL
BELOW NORMAL) AS DRIER NORTHERLY FLOW DEVELOPS ON THE BACKSIDE OF THE
TROUGH. SPEAKING OF TEMPS...INLAND AREAS NOW AVERAGE HIGHS AROUND
80 DEGREES AND THE LAST FEW DAYS WE'VE STRUGGLED TO REACH 60 SO YES
ITS BEEN UNSEASONABLY COOL AWAY FROM THE OCEAN. AFTERNOON HIGHS INTO
THE LOWERS 70S FOR THE NORTH BAY VALLEYS ON WEDS AFTERNOON SHOULD
FEEL NICE.

HIGH PRESSURE NOSES OVER THE REGION ON THURSDAY...LEADING TO THE
WARMEST DAY OF THE WEEK WITH MORE WIDESPREAD READINGS INTO THE 70S.

ONSHORE FLOW RETURNS LATER FRIDAY AND INTO THE WEEKEND AS A 500 MB
TROUGH SETS UP OVER FAR NORTHERN CALIFORNIA. NOT EXPECTING ANY
SHOWERS FOR THE BAY AREA BUT SHOWERS WILL BE POSSIBLE FARTHER
NORTH NEAR THE OREGON BORDER AND SIERRA. MAIN RESULT AROUND HERE
WILL BE CONTINUED BELOW NORMAL TEMPS FOR MAY WITH A LIKELY RETURN OF
COASTAL MARINE STRATUS.

NOT SEEING ANY RAIN IN THE EXTENDED FORECAST AT THIS TIME BUT GEM
AND ECMWF LONG RANGE MODELS DO INDICATE A FAIRLY ACTIVE PATTERN
ACROSS THE PACNW AND FAR NORTHERN CALIFORNIA THAT WILL AT LEAST
NEED WATCHING.

&&

.AVIATION...AS OF 4:35 AM PDT TUESDAY...LATEST RADAR IMAGERY SHOWS
SHOWERS FROM KSJC SOUTHWARD.  THESE SHOWERS ARE FORECAST TO
CONTINUE OVER THE NEXT FEW HOURS.  SHOWERS WILL INCREASE IN COVERAGE
AND INTENSITY AFTER 20Z AND CONTINUE THROUGH MUCH OF THE FORECAST...
AS AN UPPER LOW MOVES EAST OUT OF THE REGION.  OTHERWISE...LOW
CONFIDENCE IN REGARDS TO CIGS...AS NONE OF THE SHORT TERM MODELS
ARE HANDLING THE CURRENT SITUATION CORRECTLY.  FOR NOW...MAINLY VFR
CIGS...WITH DETERIORATING CONDITIONS THROUGH THE MORNING HOURS.
WORST CASE SCENARIO...MVFR CIGS THROUGH THE LATE MORNING AND
AFTERNOON HOURS...WITH HEIGHTS BETWEEN 2000 AND 2500 FEET.
SOUTHEAST WINDS WILL VEER TO THE WEST AFTER 20Z.

VICINITY OF KSFO...MAINLY VFR CIGS AND MODERATE SOUTHEAST
WINDS THROUGH 20Z. MVFR CIGS BETWEEN 2500 AND 3000 FEET AFTER 20Z...
WITH NUMEROUS SHOWERS AND SOUTHWEST WINDS.  LOW CONFIDENCE.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...VFR CIGS AND SOUTHEAST WINDS THROUGH
THE EARLY AFTERNOON HOURS.  MVFR CIGS AND MODERATE SOUTHWEST WINDS
AFTER 21Z.  AN INCREASE IN SHOWER ACTIVITY WILL ALSO OCCUR AFTER 21Z
AND LAST THROUGH THE FORECAST PERIOD. LOW CONFIDENCE.

&&

.MTR WATCHES/WARNINGS...NONE TODAY.

&&

PUBLIC FORECAST: RWW
AVIATION/MARINE: RILEY

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA CA
320 AM PDT TUE MAY 17 2011

CAZ006-505>513-516>518-528>530-172300-
SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO-
SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST-
MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY
INCLUDING PINNACLES NATIONAL MONUMENT-SAN FRANCISCO-
COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE-
NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS-
SAN FRANCISCO BAY SHORELINE-EAST BAY INTERIOR VALLEYS-
SAN FRANCISCO PENINSULA COAST-EAST BAY HILLS AND THE DIABLO RANGE-
NORTHERN SALINAS VALLEY...HOLLISTER VALLEY...AND CARMEL VALLEY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-NORTHERN MONTEREY BAY-
SANTA CRUZ MOUNTAINS-SANTA CLARA VALLEY...INCLUDING SAN JOSE-
320 AM PDT TUE MAY 17 2011

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

.DAY ONE...TUESDAY AND TUESDAY NIGHT

SCATTERED SHOWERS THIS MORNING WILL BECOME MORE NUMEROUS THIS
AFTERNOON AND EVENING AS THE NEXT PACIFIC SYSTEM MOVES ONSHORE
ACROSS NORTHERN CALIFORNIA. SHOWERS WILL GRADUALLY TAPER OFF LATE
TONIGHT. IN ADDITION TO THE WET WEATHER...TEMPERATURES WILL AVERAGE
5 TO 15 DEGREES BELOW NORMAL WITH DAYTIME HIGHS FROM THE MID 50S TO
MID 60S.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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