Alert archive / California / Special Weather Statements in 2011

Special Weather Statement, NWS San Francisco Bay Area, CA

March 18, 2011San Mateo County, California

NWS San Francisco Bay Area, CA issued this special weather statement at Mar 18, 2011, 11:43 AM PDT for San Mateo County, California. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Mar 18, 2011, 11:43 AM PDT (18:43 UTC)
Expired
Mar 18, 2011, 12:30 PM PDT
In force
47 min
Issued by
NWS San Francisco Bay Area, CA

County San Mateo County, CA

The radar

The San Francisco radar (KMUX), 37 km from the middle of the area, began a volume at 18:46 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.

The nearest sounding before it

Oakland, CA (KOAK), launched 12:00Z, 6.7 hours before the alert went out and 37 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Oakland, CA at 12:00Z on 2011-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 12:00Z on 2011-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 203 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
21 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
757 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
203 m²/s²
0-3 km storm-relative helicity
285 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Mar 18, 11:20 AM PDT, 23 minutes earlier.

Area forecast discussion, Mar 18, 11:20 AM PDT, 23 minutes before
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Hazardous weather outlook, Mar 18, 4:18 AM PDT, 7 hours 25 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
418 AM PDT FRI MAR 18 2011

CAZ006-505-509-529-530-191300-
SAN FRANCISCO-
COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
418 AM PDT FRI MAR 18 2011

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

.DAY ONE...FRIDAY AND FRIDAY NIGHT

A HIGH SURF ADVISORY REMAINS IN EFFECT FOR THE ENTIRE CALIFORNIA
COASTLINE BEGINNING AT 3 PM. NORTHWEST SWELL OF 14 TO 17 FEET
WILL COMBINE WITH 13 TO 15 SECOND PERIODS TO MAKE FOR HIGH SURF
ALONG THE CALIFORNIA COAST.

*  HIGH SURF ADVISORY...SEE SFOCFWMTR WHUS46 KMTR FOR DETAILS *

ALSO...A STORM SYSTEM WILL BRING A PERIOD OF HEAVY RAIN AND STRONG GUSTY
WINDS TO THE AREA ON FRIDAY...ALONG WITH ISOLATED THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE HIGH SURF ADVISORY CONTINUES UNTIL 9 PM SATURDAY

*  HIGH SURF ADVISORY...SEE SFOCFWMTR WHUS46 KMTR FOR DETAILS *

ANOTHER STORM IS FORECAST TO IMPACT THE AREA ON SUNDAY. THE STORM
ON SUNDAY WILL BE STRONGER AND WETTER THAN THE FRIDAY SYSTEM. THE
SUNDAY STORM HAS THE POTENTIAL TO PRODUCE STRONG DAMAGING WINDS AS
WELL AS HEAVY RAIN THAT MAY LEAD TO FLOODING AND MUDSLIDES. AN
ACTIVE WEATHER PATTERN WILL CONTINUE INTO NEXT WEEK WITH ANOTHER
STORM POSSIBLE ON WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

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

CAZ506>508-510>513-516>518-528-191300-
NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS-
SAN FRANCISCO BAY SHORELINE-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-
418 AM PDT FRI MAR 18 2011

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

.DAY ONE...FRIDAY AND FRIDAY NIGHT

A STORM SYSTEM WILL BRING A PERIOD OF HEAVY RAIN AND STRONG GUSTY
WINDS TO THE AREA ON FRIDAY...ALONG WITH ISOLATED THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ANOTHER STORM IS FORECAST TO IMPACT THE AREA ON SUNDAY. THE STORM
ON SUNDAY WILL BE STRONGER AND WETTER THAN THE FRIDAY SYSTEM. THE
SUNDAY STORM HAS THE POTENTIAL TO PRODUCE STRONG DAMAGING WINDS AS
WELL AS HEAVY RAIN THAT MAY LEAD TO FLOODING AND MUDSLIDES. AN
ACTIVE WEATHER PATTERN WILL CONTINUE INTO NEXT WEEK WITH ANOTHER
STORM POSSIBLE ON WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, Mar 18, 10:07 AM PDT, 1 hour 36 minutes before
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Special weather statement, Mar 18, 11:43 AM PDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 18, 9:49 AM PDTHigh Wind WatchMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more28 hr
Mar 18, 11:02 AM PDTTornado WarningMTRSan Mateo28 min

Nearby

Special Weather Statements in California, 2011Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.