Alert archive / California / Wind Advisories in 2018

Wind Advisory 8, NWS San Francisco Bay Area, CA

November 21, 2018Marin County, Napa County, Sonoma County, California

NWS San Francisco Bay Area, CA issued this wind advisory at Nov 21, 2018, 2:28 PM PST for Marin County, Napa County, Sonoma County, California. It took effect at Nov 22, 2018, 4:00 PM PST. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Nov 21, 2018, 2:28 PM PST (22:28 UTC)
In effect from
Nov 22, 2018, 4:00 PM PST
Expired
Nov 22, 2018, 9:23 PM PST
In force
5 hr
Issued by
NWS San Francisco Bay Area, CA

Counties Marin County, CA, Napa County, CA, Sonoma County, CA

The radar

The Sacramento radar (KDAX), 88 km from the middle of the area, began a volume at 22:30 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, 10.5 hours before the alert went out and 81 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 2018-11-21Temperature 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 12:00Z on 2018-11-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 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
861 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

156 
WWUS76 KMTR 212228
NPWMTR

URGENT - WEATHER MESSAGE
National Weather Service San Francisco Bay Area
228 PM PST Wed Nov 21 2018

.A storm system arriving Thanksgiving afternoon will bring gusty 
southwesterly winds across the North Bay through Friday afternoon.
Southwest winds will be locally strongest along the coast and over
the higher terrain of the North Bay. In addition, gusty 
crosswinds will impact the Golden Gate Bridge, Richmond San Rafael
Bridge, and Carquinez Bridge, bringing difficult travel for 
motorists. 

CAZ505>507-221400-
/O.NEW.KMTR.WI.Y.0008.181123T0000Z-181124T0000Z/
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
Including the cities of Tamalpais-Homestead, Sausalito, 
Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato,
Rohnert Park, Angwin, Lagunitas-Forest Knolls, and Woodacre
228 PM PST Wed Nov 21 2018

...WIND ADVISORY IN EFFECT FROM 4 PM THURSDAY TO 4 PM PST
FRIDAY...

The National Weather Service in San Francisco has issued a Wind
Advisory, which is in effect from 4 PM Thursday to 4 PM PST
Friday.

* WINDS...Southwest winds 15 to 25 mph with gusts 30 to 35 mph for
  valley locations including most urban towns and cities.
  Southwest winds 20 to 30 mph with gusts 35 to 50 mph for the 
  Marin and Sonoma coastline as well as interior North Bay 
  elevations above 1000 feet. Locally stronger winds over the 
  highest mountain peaks and ridges across the North Bay.

* TIMING... Southwest winds will strengthen across the Northern 
  San Francisco Bay between Thursday afternoon and Friday 
  afternoon. 

* IMPACTS...Damaging winds may blow down weakened trees and
  branches. Downed power lines may lead to isolated power outages.
  Travel will be difficult for high profile vehicles. Unsecured
  objects will be blown around or knocked over.  

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.

&&

$$
3 follow-up statements
216 
WWUS76 KMTR 221219
NPWMTR

URGENT - WEATHER MESSAGE
National Weather Service San Francisco Bay Area
419 AM PST Thu Nov 22 2018

.A storm system arriving Thanksgiving afternoon will bring gusty
southwesterly winds across the North Bay through Friday
afternoon. Southwest winds will be locally strongest along the
coast and over the higher terrain of the North Bay. In addition,
gusty crosswinds will impact the Golden Gate Bridge, Richmond San
Rafael Bridge, and Carquinez Bridge, bringing difficult travel
for motorists.

CAZ505>507-230000-
/O.CON.KMTR.WI.Y.0008.181123T0000Z-181124T0000Z/
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
Including the cities of Tamalpais-Homestead, Sausalito, 
Santa Rosa, South Santa Rosa, Napa, San Rafael, Petaluma, Novato,
Rohnert Park, Angwin, Lagunitas-Forest Knolls, and Woodacre
419 AM PST Thu Nov 22 2018

...WIND ADVISORY REMAINS IN EFFECT FROM 4 PM THIS AFTERNOON TO
4 PM PST FRIDAY...

* WINDS...Southwest winds 15 to 25 mph with gusts 30 to 35 mph 
  for valley locations including most urban towns and cities. 
  Southwest winds 20 to 30 mph with gusts 35 to 50 mph for the 
  Marin and Sonoma coastline as well as interior North Bay 
  elevations above 1000 feet. Locally stronger winds over the 
  highest mountain peaks and ridges across the North Bay.

* TIMING... Southwest winds will strengthen across the Northern 
  San Francisco Bay between Thursday afternoon and Friday 
  afternoon.

* IMPACTS...Damaging winds may blow down weakened trees and 
  branches. Downed power lines may lead to isolated power 
  outages. Travel will be difficult for high profile vehicles. 
  Unsecured objects will be blown around or knocked over.

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.

&&

$$
318 
WWUS76 KMTR 222352
NPWMTR

URGENT - WEATHER MESSAGE
National Weather Service San Francisco Bay Area
352 PM PST Thu Nov 22 2018

.A storm system arriving in the North Bay Thanksgiving afternoon 
will bring gusty southwesterly winds to portions of the North Bay
from late Thursday afternoon through Friday afternoon. Southwest 
winds will be strongest along the coast and over the higher 
terrain of the North Bay. In addition, gusty crosswinds will 
impact the Golden Gate Bridge, Richmond San Rafael Bridge, and 
Carquinez Bridge, resulting in difficult travel for motorists.

CAZ506-230100-
/O.CAN.KMTR.WI.Y.0008.181123T0000Z-181124T0000Z/
North Bay Interior Valleys-
Including the cities of Santa Rosa, South Santa Rosa, Napa, 
San Rafael, Petaluma, Novato, and Rohnert Park
352 PM PST Thu Nov 22 2018

...WIND ADVISORY IS CANCELLED...

The National Weather Service San Francisco Bay Area has cancelled
the Wind Advisory for the North Bay Valleys.

Winds are not expected to reach advisory levels in the valleys.

$$

CAZ505-507-231400-
/O.CON.KMTR.WI.Y.0008.181123T0000Z-181124T0000Z/
Coastal North Bay Including Point Reyes National Seashore-
North Bay Mountains-
Including the cities of Tamalpais-Homestead, Sausalito, Angwin, 
Lagunitas-Forest Knolls, and Woodacre
352 PM PST Thu Nov 22 2018

...WIND ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST FRIDAY...

* WINDS...Southwest winds 15 to 30 mph with gusts 35 to 45 mph for
  the Marin and Sonoma County coastlines as well as the North Bay
  Mountains. Locally stronger gusts are possible over the highest
  mountain peaks and ridges in the North Bay.

* TIMING... Southwest winds will strengthen across the North Bay
  late Thursday afternoon and then remain locally strong and gusty
  through Friday afternoon.

* IMPACTS...Winds may topple dead or diseased trees. Downed power
  lines may lead to isolated power outages. Travel will be 
  difficult for high profile vehicles. Unsecured objects will be 
  blown around or knocked over.

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 extra 
caution.

&&

$$
880 
WWUS76 KMTR 230523
NPWMTR

URGENT - WEATHER MESSAGE
National Weather Service San Francisco Bay Area
923 PM PST Thu Nov 22 2018

CAZ505-507-230630-
/O.CAN.KMTR.WI.Y.0008.000000T0000Z-181124T0000Z/
Coastal North Bay Including Point Reyes National Seashore-
North Bay Mountains-
Including the cities of Tamalpais-Homestead, Sausalito, Angwin, 
Lagunitas-Forest Knolls, and Woodacre
923 PM PST Thu Nov 22 2018

...WIND ADVISORY IS CANCELLED...

The National Weather Service San Francisco Bay Area has cancelled
the Wind Advisory for Coastal North Bay and the North Bay
Mountains.

Southwest winds peaked in intensity early on Thursday evening and
have since begun to subside. Although gusty winds will continue
across the North Bay through Friday, winds are no longer expected
to reach advisory levels, except perhaps at a few isolated higher
peaks. Therefore, the Wind Advisory for the North Bay Mountains
and Coastal North Bay has been cancelled. 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 21, 3:09 PM PSTGale WarningMTR29 hr
Nov 21, 3:09 PM PSTSmall Craft AdvisoryMTR48 hr

Nearby

Wind Advisories in California, 2018Every wind advisory in 2018

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.