Alert archive / California / High Wind Watches in 2010

High Wind Watch 1, NWS San Francisco Bay Area, CA

January 17, 20106 counties in California

NWS San Francisco Bay Area, CA issued this high wind watch at Jan 17, 2010, 5:16 AM PST for 6 counties in California. It took effect at Jan 18, 2010, 8:00 AM PST. It was in force for .

The area

The counties it named.

The facts

Issued
Jan 17, 2010, 5:16 AM PST (13:16 UTC)
In effect from
Jan 18, 2010, 8:00 AM PST
Expired
Jan 17, 2010, 2:45 PM PST
In force
Issued by
NWS San Francisco Bay Area, CA

Counties City and County of San Francisco, CA, Monterey County, CA, San Benito County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA

The radar

The San Francisco radar (KMUX), 14 km from the middle of the area, began a volume at 13:15 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, 1.3 hours before the alert went out and 83 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 2010-01-17Temperature 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 2010-01-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.193958Sfc1 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
-71 J/kg
Mixed-layer LCL
447 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this high wind watch 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 high wind watch went out at Jan 17, 4:39 AM PST, 37 minutes earlier.

Area forecast discussion, Jan 17, 4:39 AM PST, 37 minutes before
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Hazardous weather outlook, Jan 16, 6:39 PM PST, 10 hours 37 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
639 PM PST SAT JAN 16 2010

CAZ506>508-510>513-516>518-528-171500-
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-
639 PM PST SAT JAN 16 2010

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

.DAY ONE...SATURDAY NIGHT

A WEAK SYSTEM WILL BRING A CHANCE OF RAIN TO THE DISTRICT...
MAINLY NORTH OF MONTEREY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

A SERIES OF STORMS ARE EXPECTED TO IMPACT CALIFORNIA DURING THE WEEK.
THE FIRST STORM IS FORECAST TO SPREAD RAIN INTO OUR AREA SUNDAY
INTO MONDAY. ADDITIONAL STORMS ARE THEN EXPECTED THE REMAINDER OF
THE WEEK. DUE TO MANY DAYS OF RAINFALL ACCUMULATION...HYDROLOGIC
CONCERNS ARE POSSIBLE. IN ADDITION...THESE STORMS ARE FORECAST TO
PRODUCE STRONG GUSTY WINDS BOTH OVER THE WATER AND LAND.

* HYDROLOGIC OUTLOOK...SEE SFOESFMTR WWUS86 FOR DETAILS *

.SPOTTER INFORMATION STATEMENT...

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

CAZ006-505-509-529-530-PZZ535-171500-
SAN FRANCISCO-
COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-MONTEREY BAY-
639 PM PST SAT JAN 16 2010

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

.DAY ONE...SATURDAY NIGHT

A WEAK SYSTEM WILL BRING A CHANCE OF RAIN TO THE DISTRICT...
MAINLY NORTH OF MONTEREY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

A SERIES OF STORMS ARE EXPECTED TO IMPACT CALIFORNIA DURING THE WEEK.
THE FIRST STORM IS FORECAST TO SPREAD RAIN INTO OUR AREA SUNDAY
INTO MONDAY. ADDITIONAL STORMS ARE THEN EXPECTED THE REMAINDER OF
THE WEEK. DUE TO MANY DAYS OF RAINFALL ACCUMULATION...HYDROLOGIC
CONCERNS ARE POSSIBLE. IN ADDITION...THESE STORMS ARE FORECAST TO
PRODUCE STRONG GUSTY WINDS BOTH OVER THE WATER AND LAND.

IN ADDITION...A LARGE WEST TO NORTHWEST SWELL WILL MOVE INTO
COASTAL LOCATIONS STARTING LATE TUESDAY AND CONTINUE THROUGH
WEDNESDAY. SEAS ARE FORECAST TO BUILD TO AROUND 25 FEET BY
WEDNESDAY WITH EVEN HIGHER AMOUNTS POSSIBLE.

* HYDROLOGIC OUTLOOK...SEE SFOESFMTR WWUS86 FOR DETAILS *

* MARINE WEATHER STATEMENT...SEE SFOMWSMTR FZUS76 KMTR FOR DETAILS *

.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
Jan 16, 9:13 PM PSTGale WarningMTR62 hr
Jan 17, 3:01 AM PSTGale WarningMTR36 hr
Jan 17, 3:01 AM PSTSmall Craft AdvisoryMTR3 days
Jan 17, 2:38 PM PSTSmall Craft Advisory for Rough BarMTR5 days
Jan 17, 2:45 PM PSTWind AdvisoryMTRAlameda, Contra Costa, Marin, Monterey, San Benito, City and County of San Francisco and 4 more24 hr

Nearby

High Wind Watches in California, 2010Every high wind watch in 2010

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.