Alert archive / California / Wind Advisories in 2009

Wind Advisory 4, NWS San Francisco Bay Area, CA

April 2, 20098 counties in California

NWS San Francisco Bay Area, CA issued this wind advisory at Apr 2, 2009, 6:12 PM PDT for 8 counties in California. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Apr 2, 2009, 6:12 PM PDT (01:12 UTC)
Expired
Apr 2, 2009, 9:23 PM PDT
In force
3 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, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Sonoma County, CA

The radar

The San Francisco radar (KMUX), 69 km from the middle of the area, began a volume at 01:13 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 00:00Z, 1.2 hours before the alert went out and 6 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 00:00Z on 2009-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 00:00Z on 2009-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1433 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
69 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.

000 
WWUS76 KMTR 030112
NPWMTR

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
612 PM PDT THU APR 2 2009

...STRONG NORTHWEST WINDS WILL CONTINUE THROUGH THE EVENING HOURS...

.AN INCREASING PRESSURE GRADIENT BETWEEN HIGH PRESSURE OVER THE
EASTERN PACIFIC AND LOW PRESSURE OVER THE DESERT SOUTHWEST WAS
PRODUCING STRONG NORTHWEST WINDS ACROSS COASTAL SECTIONS OF THE
SAN FRANCISCO BAY AREA LATE ON THURSDAY AFTERNOON. STRONG AND
GUSTY WINDS WILL CONTINUE THROUGH THE REMAINDER OF THURSDAY
EVENING.

CAZ006-505-508-509-030700-
/O.NEW.KMTR.WI.Y.0004.090403T0112Z-090403T0700Z/
SAN FRANCISCO-
COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO BAY SHORELINE-SAN FRANCISCO PENINSULA COAST-
612 PM PDT THU APR 2 2009

...WIND ADVISORY IN EFFECT UNTIL MIDNIGHT PDT TONIGHT FOR COASTAL
SECTIONS OF THE SAN FRANCISCO BAY AREA...

THE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA HAS ISSUED
A WIND ADVISORY...WHICH IS IN EFFECT UNTIL MIDNIGHT PDT TONIGHT. 

AT 6 PM PDT NORTHWEST WINDS WERE GUSTING BETWEEN 40 AND 50 MPH
NEAR THE OCEAN AND LOCALLY NEAR SAN FRANCISCO BAY. SAN FRANCISCO
AIRPORT REPORTED WIND GUSTS AS HIGH AS 54 MPH. STRONG NORTHWEST
WINDS WILL CONTINUE THROUGH THE EVENING HOURS...AND THEN GRADUALLY
DIMINISH AFTER MIDNIGHT. 

WINDS WILL LIKELY INCREASE AGAIN ON FRIDAY AND BE STRONG AND GUSTY
BY AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WIND GUSTS OF AT LEAST 45 MPH ARE
EXPECTED. WINDS THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY
FOR HIGH PROFILE VEHICLES. USE CAUTION WHILE DRIVING NEAR THE
COAST AND ACROSS AREA BRIDGES.

&&

$$

DYKEMA
1 follow-up statement
000 
WWUS76 KMTR 030423
NPWMTR

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
923 PM PDT THU APR 2 2009


CAZ006-505-508-509-030530-
/O.CAN.KMTR.WI.Y.0004.000000T0000Z-090403T0700Z/
SAN FRANCISCO-
COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO BAY SHORELINE-SAN FRANCISCO PENINSULA COAST-
923 PM PDT THU APR 2 2009

...WIND ADVISORY FOR COASTAL SECTIONS OF THE SAN FRANCISCO BAY
AREA IS CANCELLED...

THE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA HAS
CANCELLED THE WIND ADVISORY. BY 9 PM PDT WIND SPEEDS HAD DECREASED
BELOW ADVISORY LEVELS. BLUSTERY CONDITIONS WILL CONTINUE OVERNIGHT
AND INTO FRIDAY WITH WIND GUSTS AS HIGH AS 40 MPH POSSIBLE NEAR
THE OCEAN AND BAYS.

$$

DYKEMA

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 3, 3:24 PM PDTWind AdvisoryMTRAlameda, Contra Costa, Marin, City and County of San Francisco, San Mateo, Santa Clara and 2 more5 hr

Nearby

Wind Advisories in California, 2009Every wind advisory in 2009

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.