Alert archive / California / Wind Advisories in 2009
Wind Advisory 4, NWS San Francisco Bay Area, CA
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 3:24 PM PDT | Wind Advisory | MTR | Alameda, Contra Costa, Marin, City and County of San Francisco, San Mateo, Santa Clara and 2 more | 5 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.