Alert archive / California / Wind Advisories in 2013

Wind Advisory 7, NWS San Francisco Bay Area, CA

October 27, 20139 counties in California

NWS San Francisco Bay Area, CA issued this wind advisory at Oct 27, 2013, 9:09 PM PDT for 9 counties in California. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Oct 27, 2013, 9:09 PM PDT (04:09 UTC)
Expired
Oct 28, 2013, 3:00 AM PDT
In force
6 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, Santa Cruz County, CA, Sonoma County, CA

The radar

The San Francisco radar (KMUX), 78 km from the middle of the area, began a volume at 04:09 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, 4.2 hours before the alert went out and 9 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 2013-10-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 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 2013-10-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 square meters per square second.19395878Sfc1 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
809 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-14 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.

794 
WWUS76 KMTR 280409
NPWMTR

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
909 PM PDT SUN OCT 27 2013

...MODERATE TO OCCASIONALLY STRONG NORTHWEST WINDS EXPECTED
THROUGH EARLY MONDAY MORNING...

.A STORM SYSTEM MOVING ALONG THE CENTRAL CALIFORNIA COAST IS
RESULTING MODERATE TO STRONG NORTHWEST WINDS. THESE CONDITIONS ARE
EXPECTED TO PERSIST THROUGH EARLY MONDAY MORNING. 

CAZ006-505>512-281000-
/O.NEW.KMTR.WI.Y.0007.131028T0409Z-131028T1000Z/
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-
909 PM PDT SUN OCT 27 2013

...WIND ADVISORY IN EFFECT UNTIL 3 AM PDT MONDAY...

THE NATIONAL WEATHER SERVICE IN THE SAN FRANCISCO BAY AREA HAS
ISSUED A WIND ADVISORY...WHICH IS IN EFFECT UNTIL 3 AM PDT
MONDAY. 

* TIMING: THROUGH 3:00 AM PDT.

* WINDS: 30 TO 39 MPH WITH GUSTS TO 55 MPH.

* IMPACTS: POSSIBLE IMPACTS WILL INCLUDE DOWN TREES AND POWER
  LINES AS WELL AS DIFFICULT DRIVING CONDITIONS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$
1 follow-up statement
141 
WWUS76 KMTR 280942
NPWMTR

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
242 AM PDT MON OCT 28 2013

CAZ006-505>512-281045-
/O.EXP.KMTR.WI.Y.0007.000000T0000Z-131028T1000Z/
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-
242 AM PDT MON OCT 28 2013

...WIND ADVISORY WILL EXPIRE AT 3 AM PDT EARLY THIS MORNING...

THE WIND ADVISORY WILL EXPIRE AT 3 AM PDT EARLY THIS MORNING. 

THE PERIOD OF STRONGEST WINDS HAS NOW SUBSIDED...THEREFORE THE
WIND ADVISORY WILL BE ALLOWED TO EXPIRE AT 3 AM. BREEZY WEST WINDS
FROM 15 TO 25 MPH WITH LOCAL GUSTS TO 35 MPH WILL STILL BE
POSSIBLE THIS MORNING BUT DAMAGING WINDS ASSOCIATED WITH LAST
NIGHTS COLD FRONTAL PASSAGE HAVE NOW SHIFTED TO THE SOUTH.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 28, 2:46 PM PDTFrost AdvisoryMTRMonterey, San Benito36 hr

Nearby

Wind Advisories in California, 2013Every wind advisory in 2013

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.