Alert archive / California / Dense Fog Advisories in 2012

Dense Fog Advisory 9, NWS San Francisco Bay Area, CA

November 26, 20128 counties in California

NWS San Francisco Bay Area, CA issued this dense fog advisory at Nov 26, 2012, 3:52 AM PST for 8 counties in California. It took effect at Nov 26, 2012, 4:00 AM PST. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Nov 26, 2012, 3:52 AM PST (11:52 UTC)
In effect from
Nov 26, 2012, 4:00 AM PST
Expired
Nov 26, 2012, 9:00 AM PST
In force
5 hr
Issued by
NWS San Francisco Bay Area, CA

Counties Alameda County, CA, City and County of San Francisco, CA, Contra Costa County, CA, Marin County, CA, Napa County, CA, San Mateo County, CA, Santa Clara County, CA, Sonoma County, CA

The radar

The Sacramento radar (KDAX), 87 km from the middle of the area, began a volume at 11:56 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this dense fog 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 dense fog advisory went out at Nov 26, 3:44 AM PST, 8 minutes earlier.

Area forecast discussion, Nov 26, 3:44 AM PST, 8 minutes before
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Hazardous weather outlook, Nov 25, 9:16 AM PST, 18 hours 36 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
916 AM PST SUN NOV 25 2012

CAZ006-505>513-516>518-528>530-261730-
SAN FRANCISCO-
COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE-
NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS-
SAN FRANCISCO BAY SHORELINE-SAN FRANCISCO PENINSULA COAST-
EAST BAY INTERIOR VALLEYS-EAST BAY HILLS AND DIABLO RANGE-
SANTA CRUZ MOUNTAINS-SANTA CLARA VALLEY...INCLUDING SAN JOSE-
SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO-
SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST-
MOUNTAINS OF SAN BENITO AND INTERIOR MONTEREY COUNTY INCLUDING
PINNACLES NATIONAL MONUMENT-
NORTHERN SALINAS VALLEY...HOLLISTER VALLEY...AND CARMEL VALLEY-
NORTHERN MONTEREY BAY-SOUTHERN MONTEREY BAY AND BIG SUR COAST-
916 AM PST SUN NOV 25 2012

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

.DAY ONE...SUNDAY AND SUNDAY NIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A STRONG PACIFIC STORM SYSTEM IS EXPECTED TO IMPACT THE AREA BY
WEDNESDAY AND LAST THROUGH THE END OF THE WEEK. IT REMAINS TOO
EARLY TO FOCUS ON EXACT DETAILS OF LOCATION...INTENSITY...AND
TIMING...BUT THE POTENTIAL EXISTS FOR SIGNIFICANT RAINFALL AND
STRONG WINDS ACROSS THE AREA. POTENTIALLY DAMAGING WINDS ARE
POSSIBLE IN THE HIGH ELEVATIONS AND GALES POSSIBLE OVER THE LOCAL
WATERS. CONTINUE TO MONITOR THE NATIONAL WEATHER SERVICE AND LOCAL
MEDIA OUTLETS FOR FURTHER UPDATES ON THIS DEVELOPING STORM SYSTEM.

.SPOTTER INFORMATION STATEMENT...

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

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 26, 3:07 AM PSTGale WatchMTR12 hr
Nov 26, 9:39 AM PSTMarine Dense Fog AdvisoryMTR2 hr
Nov 26, 3:02 PM PSTGale WarningMTR47 hr
Nov 26, 3:02 PM PSTSmall Craft AdvisoryMTR37 hr

Nearby

Dense Fog Advisories in California, 2012Every dense fog advisory in 2012

Sources

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