Alert archive / California / Small Craft Advisories in 2011

Small Craft Advisory 364, NWS San Francisco Bay Area, CA

November 28, 2011

NWS San Francisco Bay Area, CA issued this small craft advisory at Nov 28, 2011, 2:53 AM PST. It took effect at Nov 29, 2011, 3:00 AM PST. It was in force for 60 hr.

The area

The counties it named.

The facts

Issued: Nov 28, 2011, 2:53 AM PST (10:53 UTC)
In effect from: Nov 29, 2011, 3:00 AM PST
Expired: Dec 1, 2011, 3:00 PM PST
In force: 60 hr
Issued by: NWS San Francisco Bay Area, CA

What forecasters said that day

The local office's own words before this small craft advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Francisco Bay Area, CA wrote its last area forecast discussion before this small craft advisory went out at Nov 27, 9:42 PM PST, 5 hours 11 minutes earlier.

Area forecast discussion, Nov 27, 9:42 PM PST, 5 hours 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
942 PM PST SUN NOV 27 2011

.DISCUSSION...AS OF 8:30 PM PST SUNDAY...CURRENTLY THE IR
SATELLITE IMAGE IS SHOWING A MIX OF HIGH AND LOW CLOUDS OVER THE
FORECAST AREA. NUMEROUS OBSERVATIONS OF FOG HAVE BEEN REPORTED
THIS EVENING...ESPECIALLY IN THE EAST BAY. AT THIS HOUR CONCORD IS
REPORTING VIS TO 1/8 OF A MILE WHICH IS A DANGEROUS CONDITION TO
DRIVE OR NAVIGATE IN. DEW POINTS AROUND THE FORECAST AREA ARE
HOVERING AROUND 49 DEGREES FAHRENHEIT WITH TEMPERATURES IN THE
UPPER 40S TO LOW 50S. LIGHT TO CALM WINDS ARE ALSO BEING REPORTED
UNDER A RIDGE OF HIGH PRESSURE. THESE CONDITIONS...CALM WINDS AND
SMALL DEW POINT DEPRESSIONS...LEND TOWARDS THE DEVELOPMENT OF
DENSE FOG. THEREFORE...HAVE ISSUED A DENSE FOG ADVISORY FOR THE
NORTH AND EAST BAY VALLEYS AS WELL AS THE SANTA CLARA VALLEY FOR
THE REMAINDER OF THIS EVENING INTO MONDAY MORNING. SOME AREAS SUCH
AS THE SANTA CLARA VALLEY MAY NOT SEE WIDESPREAD DENSE FOG UNTIL
SHORTLY BEFORE SUNRISE. BUT MOTORISTS SHOULD BE AWARE THAT THESE
CONDITIONS MAY DEVELOP AT ANYTIME AND SHOULD BE PREPARED TO ACT
ACCORDINGLY. IT IS STRONGLY ADVISED TO GIVE YOURSELF A LITTLE
EXTRA TIME FOR YOUR MORNING COMMUTE IF YOU ARE TRAVEL THROUGH
THESE AREAS.

ADDITIONALLY DENSE FOG IS ALSO EXPECTED TO DEVELOP IN THE SAN
FRANCISCO BAY. THIS DENSE FOG WILL REDUCE VISIBILITY TO 1/2 OF A
MILE OR LESS.

PREVIOUS DISCUSSION...AN UPPER LOW WILL DIVE INTO WA STATE
TUESDAY NIGHT...THEN THROUGH THE GREAT BASIN AND INTO SOUTHEAST
CALIFORNIA. AT THE SAME TIME...AN UPPER RIDGE WILL BUILD STRONGLY
ALONG 135W...INTO THE SOUTHERN PORTIONS OF THE GULF OF ALASKA.
THIS WILL RESULT IN A STRONG OFFSHORE FLOW WITH A DRY BOUNDARY
LAYER...SO NO FOG. HOWEVER...THE BIG CHANGE WILL BE THE STRONG AND
GUSTY NE WINDS...ESPECIALLY IN THE NORTH AND EAST BAY HILLS AND
POSSIBLY THE SANTA CRUZ MOUNTAINS WED NIGHT AND THURSDAY AND
POSSIBLY THURSDAY NIGHT AS WELL. THE GFS IS INDC STRONG COLD AIR
ADVECTION SO THE WINDS COULD POSSIBLY MIX DOWN INTO THE VALLEYS AS
WELL. THIS WILL NEED TO BE MONITORED.

THE RIDGE ALONG 135W WILL BE THE CONTROLLING FACTOR FOR THE
DISTRICTS WEATHER THROUGH THE END OF THE WEEK AND NEXT WEEKEND AS
WELL. DRY WEATHER AND MILD TEMPS ARE EXPECTED...WITH NO RAIN FOR
THE NEXT SEVEN DAYS AT LEAST.

&&

.AVIATION...AS OF 9:40 PM PST SUNDAY...FORECAST CONTINUES TO HINGE ON
PERSISTENCE TONIGHT AND MONDAY. THE AIRMASS IS STABLE AND CONDUCIVE
TO EITHER VERY LOW CLOUD BASED CEILINGS OR FOG.

VICINITY OF KSFO...MVFR DUE TO VISIBILITIES THROUGH THE EVENING.
CONDITIONS WILL LIKELY GO TO IFR BY 14Z MONDAY MORNING. VFR WILL
LIKELY RETURN BY MONDAY AFTERNOON.

KSFO BRIDGE APPROACH...SIMILAR CONDITIONS TO KSFO.

MONTEREY BAY AREA TERMINALS...MODERATE CONFIDENCE VFR CONDITIONS
EXTENDS INTO THE NIGHT. LIGHT WINDS.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
 .TNGT...DENSE FOG ADVISORY....NORTH AND EAST BAY VALLEYS AND THE
                               SANTA CLARA VALLEY.
         MARINE FOG ADVISORY...SF BAY FROM MIDNIGHT

&&

PUBLIC FORECAST: LARRY/STROBIN
AVIATION/MARINE: CANEPA

Hazardous weather outlook, Nov 27, 7:54 PM PST, 6 hours 59 minutes before

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The office that day

Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 27, 7:19 PM PST	Dense Fog Advisory	MTR	Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara and 1 more	16 hr
Nov 27, 7:35 PM PST	Marine Dense Fog Advisory	MTR		15 hr
Nov 28, 3:09 AM PST	High Wind Watch	MTR	San Mateo, Santa Clara, Santa Cruz	24 hr
Nov 28, 2:29 PM PST	Small Craft Advisory	MTR		42 hr

Nearby

Small Craft Advisories in California, 2011 Every small craft advisory in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.