Alert archive / California / Wind Advisories in 2025

Wind Advisory 18, NWS San Francisco Bay Area, CA

December 23, 202510 counties in California

NWS San Francisco Bay Area, CA issued this wind advisory at Dec 23, 2025, 1:09 PM PST for 10 counties in California. It took effect at Dec 23, 2025, 4:00 PM PST. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued
Dec 23, 2025, 1:09 PM PST (21:09 UTC)
In effect from
Dec 23, 2025, 4:00 PM PST
Expired
Dec 24, 2025, 7:17 AM PST
In force
15 hr
Issued by
NWS San Francisco Bay Area, CA

Counties Alameda County, CA, Contra Costa County, CA, Marin County, CA, Monterey County, CA, Napa County, CA, San Benito County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Sonoma County, CA

The radar

The San Francisco radar (KMUX), 42 km from the middle of the area, began a volume at 21:10 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, 9.2 hours before the alert went out and 28 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 2025-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 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 2025-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 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
12 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
585 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
298 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

924 
WWUS76 KMTR 232109
NPWMTR

URGENT - WEATHER MESSAGE
National Weather Service San Francisco CA
109 PM PST Tue Dec 23 2025

CAZ504-506-508-510-512>515-518-241200-
/O.CAN.KMTR.HW.W.0004.251224T0000Z-251224T1200Z/
/O.NEW.KMTR.WI.Y.0018.251224T0000Z-251224T1200Z/
North Bay Interior Mountains-North Bay Interior Valleys-San
Francisco Bay Shoreline-East Bay Interior Valleys-Santa Cruz
Mountains-Santa Clara Valley Including San Jose-Eastern Santa
Clara Hills-East Bay Hills-Mountains of San Benito County And
Interior Monterey County including Pinnacles National Park-
109 PM PST Tue Dec 23 2025

...CORRECTION: HIGH WIND WARNING REVERTED BACK TO WIND ADVISORY IN
EFFECT UNTIL 4 AM PST WEDNESDAY...

* WHAT...Southeast winds 20 to 30 mph with gusts up to 55 mph
  expected.

* WHERE...The East Bay and San Francisco Bay Shoreline, The Santa
  Clara Valley and Eastern Hills, The Santa Cruz Mountains, Most of
  San Benito County and the Cholame Hills in Southeast Monterey
  County, North Bay Interior Mountains, and North Bay Interior
  Valleys.

* WHEN...Until 4 AM PST Wednesday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.

&&

$$

CAZ006-516-528-529-241200-
/O.EXA.KMTR.HW.W.0004.251224T0000Z-251224T1200Z/
San Francisco-Southern Salinas Valley/Arroyo Seco and Lake San
Antonio-Northern Salinas Valley/Hollister Valley and Carmel
Valley-Northern Monterey Bay-
109 PM PST Tue Dec 23 2025

...HIGH WIND WARNING IN EFFECT UNTIL 4 AM PST WEDNESDAY...

* WHAT...Southeast winds 20 to 30 mph with gusts up to 60 mph
  expected.

* WHERE...The Salinas and Carmel Valleys and Hollister Area, Northern
  Monterey Bay, and San Francisco.

* WHEN...Until 4 AM PST Wednesday.

* IMPACTS...Damaging winds will blow down trees and power lines.
  Widespread power outages are expected. Travel will be difficult,
  especially for high profile vehicles. Damaging winds could down
  trees, snap power lines, and result in property damage. Widespread
  power outages are possible. Travel could be extremely difficult and
  hazardous, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People are urged to secure loose objects that could be blown around
or damaged by the wind.

Secure loose outdoor objects that could be blown around or damaged by
the wind.

&&

$$

CAZ502-503-505-509-517-530-241200-
/O.CON.KMTR.HW.W.0004.251224T0000Z-251224T1200Z/
Marin Coastal Range-Sonoma Coastal Range-Coastal North Bay
Including Point Reyes National Seashore-San Francisco Peninsula
Coast-Santa Lucia Mountains and Los Padres National Forest-
Southern Monterey Bay and Big Sur Coast-
109 PM PST Tue Dec 23 2025

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 4 AM PST WEDNESDAY...

* WHAT...Southeast winds 30 to 40 mph with gusts up to 65 mph
  expected. Isolated areas along the coast may see a few gusts up to
  75 mph.

* WHERE...Southern Monterey Bay and the Big Sur Coast, The Marin
  Hills, Western Sonoma County Hills, Interior Monterey County and
  the Santa Lucia Range, Coastal North Bay Including Point Reyes
  National Seashore, and San Francisco Peninsula Coast.

* WHEN...Until 4 AM PST Wednesday.

* IMPACTS...Damaging winds will blow down trees and power lines.
  Widespread power outages are expected. Travel will be difficult,
  especially for high profile vehicles. Damaging winds could down
  trees, snap power lines, and result in property damage. Widespread
  power outages are possible. Travel could be extremely difficult and
  hazardous, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People are urged to secure loose objects that could be blown around
or damaged by the wind.

Secure loose outdoor objects that could be blown around or damaged by
the wind.

&&

$$

Flynn
3 follow-up statements
403 
WWUS76 KMTR 241123
NPWMTR

URGENT - WEATHER MESSAGE
National Weather Service San Francisco CA
323 AM PST Wed Dec 24 2025

CAZ006-502-503-505-509-516-517-528>530-241600-
/O.EXT.KMTR.HW.W.0004.000000T0000Z-251224T1600Z/
San Francisco-Marin Coastal Range-Sonoma Coastal Range-Coastal
North Bay Including Point Reyes National Seashore-San Francisco
Peninsula Coast-Southern Salinas Valley/Arroyo Seco and Lake San
Antonio-Santa Lucia Mountains and Los Padres National Forest-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
323 AM PST Wed Dec 24 2025

...HIGH WIND WARNING NOW IN EFFECT UNTIL 8 AM PST THIS MORNING...

* WHAT...Southeast winds 30 to 40 mph with gusts up to 65 mph
  expected. Isolated areas along the coast may see a few gusts up to
  75 mph.

* WHERE...The Salinas and Carmel Valleys and Hollister Area, Monterey
  Bay and the Big Sur Coast, The Marin Hills, Western Sonoma County
  Hills, Interior Monterey County and the Santa Lucia Range, San
  Francisco, Coastal North Bay Including Point Reyes National
  Seashore, and San Francisco Peninsula Coast.

* WHEN...Until 8 AM PST this morning.

* IMPACTS...Damaging winds will blow down trees and power lines.
  Widespread power outages are expected. Travel will be difficult,
  especially for high profile vehicles. Damaging winds could down
  trees, snap power lines, and result in property damage. Widespread
  power outages are possible. Travel could be extremely difficult and
  hazardous, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People are urged to secure loose objects that could be blown around
or damaged by the wind.

Secure loose outdoor objects that could be blown around or damaged by
the wind.

&&

$$

CAZ504-506-508-510-512>515-518-241600-
/O.EXT.KMTR.WI.Y.0018.000000T0000Z-251224T1600Z/
North Bay Interior Mountains-North Bay Interior Valleys-San
Francisco Bay Shoreline-East Bay Interior Valleys-Santa Cruz
Mountains-Santa Clara Valley Including San Jose-Eastern Santa
Clara Hills-East Bay Hills-Mountains of San Benito County And
Interior Monterey County including Pinnacles National Park-
323 AM PST Wed Dec 24 2025

...WIND ADVISORY NOW IN EFFECT UNTIL 8 AM PST THIS MORNING...

* WHAT...Southeast winds 20 to 30 mph with gusts up to 55 mph
  expected.

* WHERE...The East Bay and San Francisco Bay Shoreline, The Santa
  Clara Valley and Eastern Hills, The Santa Cruz Mountains, Most of
  San Benito County and the Cholame Hills in Southeast Monterey
  County, North Bay Interior Mountains, and North Bay Interior
  Valleys.

* WHEN...Until 8 AM PST this morning.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.

&&

$$

DialH
222 
WWUS76 KMTR 241308
NPWMTR

URGENT - WEATHER MESSAGE
National Weather Service San Francisco CA
508 AM PST Wed Dec 24 2025

CAZ006-505-509-517-528>530-242115-
/O.NEW.KMTR.HW.W.0005.251225T0400Z-251225T1800Z/
/O.CON.KMTR.HW.W.0004.000000T0000Z-251224T1600Z/
San Francisco-Coastal North Bay Including Point Reyes National
Seashore-San Francisco Peninsula Coast-Santa Lucia Mountains and
Los Padres National Forest-Northern Salinas Valley/Hollister
Valley and Carmel Valley-Northern Monterey Bay-Southern Monterey
Bay and Big Sur Coast-
508 AM PST Wed Dec 24 2025

...HIGH WIND WARNING IN EFFECT FROM 8 PM THIS EVENING TO 10 AM PST
THURSDAY...
...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING...

* WHAT...For the first High Wind Warning, southwest winds 15 to 25
  mph with gusts up to 45 mph. For the second High Wind Warning,
  south winds 25 to 35 mph with gusts up to 65 mph expected.

* WHERE...Monterey Bay and the Big Sur Coast, Interior Monterey
  County and the Santa Lucia Range, San Francisco, Coastal North Bay
  Including Point Reyes National Seashore, San Francisco Peninsula
  Coast, and Northern Salinas Valley/Hollister Valley and Carmel
  Valley.

* WHEN...For the first High Wind Warning, until 8 AM PST this
  morning. For the second High Wind Warning, from 8 PM this evening
  to 10 AM PST Thursday.

* IMPACTS...Damaging winds will blow down trees and power lines.
  Widespread power outages are expected. Travel will be difficult,
  especially for high profile vehicles. Damaging winds could down
  trees, snap power lines, and result in property damage. Widespread
  power outages are possible. Travel could be extremely difficult and
  hazardous, especially for high profile vehicles. The combination of
  wind and moist soils will increase the risk for downed trees.
  Strong winds may move loose debris, result in minor damage
  property, and cause sporadic power outages. Travel could become
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People are urged to secure loose objects that could be blown around
or damaged by the wind.

Secure loose outdoor objects that could be blown around or damaged by
the wind.

&&

$$

CAZ502-516-242115-
/O.NEW.KMTR.WI.Y.0019.251225T0400Z-251225T1800Z/
/O.CON.KMTR.HW.W.0004.000000T0000Z-251224T1600Z/
Marin Coastal Range-Southern Salinas Valley/Arroyo Seco and Lake
San Antonio-
508 AM PST Wed Dec 24 2025

...WIND ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 10 AM PST
THURSDAY...
...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING...

* WHAT...For the High Wind Warning, south winds 10 to 20 mph with
  gusts up to 40 mph. For the Wind Advisory, south winds 15 to 25 mph
  with gusts up to 60 mph expected.

* WHERE...The Marin Hills, and Southern Salinas Valley/Arroyo Seco
  and Lake San Antonio.

* WHEN...For the High Wind Warning, until 8 AM PST this morning. For
  the Wind Advisory, from 8 PM this evening to 10 AM PST Thursday.

* IMPACTS...Damaging winds will blow down trees and power lines.
  Widespread power outages are expected. Travel will be difficult,
  especially for high profile vehicles. Damaging winds could down
  trees, snap power lines, and result in property damage. Widespread
  power outages are possible. Travel could be extremely difficult and
  hazardous, especially for high profile vehicles. The combination of
  wind and moist soils will increase the risk for downed trees. Gusty
  winds will blow around unsecured objects. Tree limbs could be blown
  down and a few power outages may result. Strong winds may move
  loose debris, result in minor damage property, and cause sporadic
  power outages. Travel could become difficult, especially for high
  profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People are urged to secure loose objects that could be blown around
or damaged by the wind.

Secure loose outdoor objects that could be blown around or damaged by
the wind.

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.

&&

$$

CAZ503-241600-
/O.CON.KMTR.HW.W.0004.000000T0000Z-251224T1600Z/
Sonoma Coastal Range-
508 AM PST Wed Dec 24 2025

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING...

* WHAT...Southwest winds 15 to 25 mph with gusts up to 50 mph.

* WHERE...Western Sonoma County Hills.

* WHEN...Until 8 AM PST this morning.

* IMPACTS...Damaging winds will blow down trees and power lines.
  Widespread power outages are expected. Travel will be difficult,
  especially for high profile vehicles. Damaging winds could down
  trees, snap power lines, and result in property damage. Widespread
  power outages are possible. Travel could be extremely difficult and
  hazardous, especially for high profile vehicles. The combination of
  wind and moist soils will increase the risk for downed trees.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People are urged to secure loose objects that could be blown around
or damaged by the wind.

Secure loose outdoor objects that could be blown around or damaged by
the wind.

&&

$$

CAZ504-506-508-510-512>515-518-242115-
/O.NEW.KMTR.WI.Y.0019.251225T0400Z-251225T1800Z/
/O.CON.KMTR.WI.Y.0018.000000T0000Z-251224T1600Z/
North Bay Interior Mountains-North Bay Interior Valleys-San
Francisco Bay Shoreline-East Bay Interior Valleys-Santa Cruz
Mountains-Santa Clara Valley Including San Jose-Eastern Santa
Clara Hills-East Bay Hills-Mountains of San Benito County And
Interior Monterey County including Pinnacles National Park-
508 AM PST Wed Dec 24 2025

...WIND ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 10 AM PST
THURSDAY...
...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING...

* WHAT...For the first Wind Advisory, southwest winds 20 to 30 mph
  with gusts up to 50 mph. For the second Wind Advisory, south winds
  20 to 30 mph with gusts up to 65 mph expected.

* WHERE...The East Bay and San Francisco Bay Shoreline, The Santa
  Clara Valley and Eastern Hills, The Santa Cruz Mountains, Most of
  San Benito County and the Cholame Hills in Southeast Monterey
  County, North Bay Interior Mountains, and North Bay Interior
  Valleys.

* WHEN...For the first Wind Advisory, until 8 AM PST this morning.
  For the second Wind Advisory, from 8 PM this evening to 10 AM PST
  Thursday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.
  Strong winds may move loose debris, result in minor damage
  property, and cause sporadic power outages. Travel could become
  difficult, especially for high profile vehicles. The combination of
  wind and moist soils will increase the risk for downed trees.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.

&&

$$

BKM
691 
WWUS76 KMTR 241517
NPWMTR

URGENT - WEATHER MESSAGE
National Weather Service San Francisco CA
717 AM PST Wed Dec 24 2025

CAZ006-505-509-517-528>530-242330-
/O.CAN.KMTR.HW.W.0004.000000T0000Z-251224T1600Z/
/O.CON.KMTR.HW.W.0005.251225T0400Z-251225T1800Z/
San Francisco-Coastal North Bay Including Point Reyes National
Seashore-San Francisco Peninsula Coast-Santa Lucia Mountains and
Los Padres National Forest-Northern Salinas Valley/Hollister
Valley and Carmel Valley-Northern Monterey Bay-Southern Monterey
Bay and Big Sur Coast-
717 AM PST Wed Dec 24 2025

...HIGH WIND WARNING IS CANCELLED...
...HIGH WIND WARNING REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 10
AM PST THURSDAY...

* WHAT...South winds 25 to 35 mph with gusts up to 65 mph expected.

* WHERE...Monterey Bay and the Big Sur Coast, Interior Monterey
  County and the Santa Lucia Range, San Francisco, Coastal North Bay
  Including Point Reyes National Seashore, San Francisco Peninsula
  Coast, and Northern Salinas Valley/Hollister Valley and Carmel
  Valley.

* WHEN...From 8 PM this evening to 10 AM PST Thursday.

* IMPACTS...Damaging winds could down trees, snap power lines, and
  result in property damage. Widespread power outages are possible.
  Travel could be extremely difficult and hazardous, especially for
  high profile vehicles. Strong winds may move loose debris, result
  in minor damage property, and cause sporadic power outages. Travel
  could become difficult, especially for high profile vehicles. The
  combination of wind and moist soils will increase the risk for
  downed trees.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People are urged to secure loose objects that could be blown around
or damaged by the wind.

&&

$$

CAZ502-516-242330-
/O.CAN.KMTR.HW.W.0004.000000T0000Z-251224T1600Z/
/O.CON.KMTR.WI.Y.0019.251225T0400Z-251225T1800Z/
Marin Coastal Range-Southern Salinas Valley/Arroyo Seco and Lake
San Antonio-
717 AM PST Wed Dec 24 2025

...HIGH WIND WARNING IS CANCELLED...
...WIND ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 10 AM
PST THURSDAY...

* WHAT...South winds 15 to 25 mph with gusts up to 55 mph expected.

* WHERE...The Marin Hills, and Southern Salinas Valley/Arroyo Seco
  and Lake San Antonio.

* WHEN...From 8 PM this evening to 10 AM PST Thursday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.
  Strong winds may move loose debris, result in minor damage
  property, and cause sporadic power outages. Travel could become
  difficult, especially for high profile vehicles. The combination of
  wind and moist soils will increase the risk for downed trees.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.

&&

$$

CAZ503-241630-
/O.CAN.KMTR.HW.W.0004.000000T0000Z-251224T1600Z/
Sonoma Coastal Range-
717 AM PST Wed Dec 24 2025

...HIGH WIND WARNING IS CANCELLED...

The threat has ended.

$$

CAZ504-506-508-510-512>515-518-242330-
/O.CAN.KMTR.WI.Y.0018.000000T0000Z-251224T1600Z/
/O.CON.KMTR.WI.Y.0019.251225T0400Z-251225T1800Z/
North Bay Interior Mountains-North Bay Interior Valleys-San
Francisco Bay Shoreline-East Bay Interior Valleys-Santa Cruz
Mountains-Santa Clara Valley Including San Jose-Eastern Santa
Clara Hills-East Bay Hills-Mountains of San Benito County And
Interior Monterey County including Pinnacles National Park-
717 AM PST Wed Dec 24 2025

...WIND ADVISORY IS CANCELLED...
...WIND ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 10 AM
PST THURSDAY...

* WHAT...South winds 20 to 30 mph with gusts up to 55 mph expected.

* WHERE...The East Bay and San Francisco Bay Shoreline, The Santa
  Clara Valley and Eastern Hills, The Santa Cruz Mountains, Most of
  San Benito County and the Cholame Hills in Southeast Monterey
  County, North Bay Interior Mountains, and North Bay Interior
  Valleys.

* WHEN...From 8 PM this evening to 10 AM PST Thursday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.
  Strong winds may move loose debris, result in minor damage
  property, and cause sporadic power outages. Travel could become
  difficult, especially for high profile vehicles. The combination of
  wind and moist soils will increase the risk for downed trees.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.

&&

$$

Palmer

What forecasters said that day

The local office's own words before this wind advisory 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 wind advisory went out at Dec 23, 10:30 AM PST, 2 hours 39 minutes earlier. Its key messages:

  • Updated at 210 AM PST Tue Dec 23 2025
  • Flood watch continues for the North Bay through Friday evening; Flood Watch for the rest of the Bay Area and Central Coast begins at 10 AM PST this morning
  • Light rain continues through this afternoon with moderate to heavy rain returning Tuesday night into Wednesday morning. Minor nuisance flooding remains possible today
  • Increasing chances for urban flooding and extensive travel delays late Tuesday into early Friday across entire Bay Area and Central Coast as widespread heavy rain returns
  • Very hazardous, impactful winds Tuesday through early Friday along our entire coastline and higher elevations inland with power outages likely
  • A slight chance of severe thunderstorms with strong wind gusts late Tuesday through Thursday with the potential to continue into Friday
  • Dangerous beach and marine conditions anticipated late Tuesday through Friday for all Pacific Coast Beaches
Area forecast discussion, Dec 23, 10:30 AM PST, 2 hours 39 minutes before
Area Forecast Discussion
National Weather Service San Francisco CA
1030 AM PST Tue Dec 23 2025

...New AVIATION, MARINE...

.KEY MESSAGES...
Updated at 210 AM PST Tue Dec 23 2025

 - Flood watch continues for the North Bay through Friday evening;
   Flood Watch for the rest of the Bay Area and Central Coast
   begins at 10 AM PST this morning

 - Light rain continues through this afternoon with moderate to
   heavy rain returning Tuesday night into Wednesday morning.
   Minor nuisance flooding remains possible today

 - Increasing chances for urban flooding and extensive travel
   delays late Tuesday into early Friday across entire Bay Area
   and Central Coast as widespread heavy rain returns

 - Very hazardous, impactful winds Tuesday through early Friday along
   our entire coastline and higher elevations inland with power
   outages likely

 - A slight chance of severe thunderstorms with strong wind gusts
   late Tuesday through Thursday with the potential to continue
   into Friday

 - Dangerous beach and marine conditions anticipated late Tuesday
   through Friday for all Pacific Coast Beaches

&&

.SHORT TERM...
Issued at 210 AM PST Tue Dec 23 2025
(Today and tonight)

Scattered showers continue across the Bay Area as the main rainband
from Monday continues to drift northward. Light rain is expected to
continue primarily across the North Bay today with scattered showers
across the rest of the Bay Area and Central Coast. Offshore, an area
of low pressure currently located to our southeast will strengthen
as it moves northwards. The rapid deepening of this low pressure
system will create a very tight pressure gradient along our
coastline and result in very strong winds. Models continue to
highlight a 70-80 knot (80-90 mph) low level jet at 925 mb and a 500
mb jet max around 100 knots (115 mph) moving in over the Bay Area.
Some higher resolution models suggest that isolated hurricane force
gusts (74 mph+) could be possible offshore. The low pressure system
is set to move northwards parallel to our coastline with impacts
starting late Tuesday afternoon and continuing through early
Wednesday morning. In terms of wind impacts, confidence is highest
that gusts to around 65 mph will be limited to the coastline with
the potential for gusts to around 75 mph on isolated portions of the
coast. Gusts between 25 to 35 mph with gusts to 55 mph are expected
across the interior Bay Area late Tuesday into Wednesday.
Precipitation amounts for Tuesday have decreased with recent model
runs showing a messier, scattered system moving through the Bay Area
compared to the widespread, more stratiform like rain moving to our
north and south. Moderate to heavy rain is still expected late
tonight into Wednesday as the front moves through but heavy rain may
be more isolated in occurrence that originally forecast. The WPC
maintains a slight (15%) chance of excessive rainfall along the
coastline and a marginal (5%) for interior portions of the Bay Area
and Central Coast for Tuesday into early Wednesday. The more
scattered nature of precipitation will help to reduce more
widespread flooding impacts and keep them more localized to where
the heaviest rainfall is able to set up. The highest rainfall totals
are forecast to be within the coastal mountains of the North Bay,
Santa Cruz, and Santa Lucia Range.

There is also a 10-15% chance of thunderstorms with this system late
tonight into early Wednesday morning. In terms of favorability,
there is decent instability (MUCAPE values around 200-300 J/kg),
lift from the cold front, good amounts of moisture (PWAT values
around 1"), and strong low level wind shear. Wind shear is the most
favorable factor for thunderstorm development with guidance showing
surface to 1KM shear ranging anywhere from 30 knots to 45 knots.
Currently the SPC has a general mention of thunderstorms along the
California coast but, given the large amounts of low level shear,
there is the potential for severe thunderstorms to develop. If a
severe thunderstorm is able to develop it may produce a waterspout
or a weak tornado. The risk of this would be highest along the
coastline with SPC showing an increasing threat of severe weather
starting Wednesday.

While widespread flooding concerns appear lower with tonight's
system, it may still result in ponding on the roadway and sharp
rises in smaller streams and creeks (Mark West Creek, San Lorenzo,
etc). If you encounter flooding on the roadway, do not drive through
it - Turn Around, Don't Drown. With the combination of strong winds
and moderate to heavy rain, downed trees and power outages will
occur - especially if you live along the coast. Have multiple ways
to receive warnings in the event that flooding or severe weather
does occur.

&&

.LONG TERM...
Issued at 210 AM PST Tue Dec 23 2025
(Wednesday through Monday)

Impacts from the initial Tuesday night to Wednesday morning system
will decrease by late morning, but, a second potentially more
impactful system will arrive late Wednesday and continue through
Friday. This second system will follow a similar path as the first
with rapid deepening expected as it moves northwards, parallel to
the California coastline. This will bring another round of strong,
impactful winds with it but wind gusts will be slightly weaker than
they were compared to the first system. Multiple rounds of moderate
to heavy rain will move through the Bay Area and the Central Coast
with this system. The WPC has issued a slight risk of excessive
rainfall for much of our area Wednesday and a marginal risk of
excessive rainfall for the Big Sur coastline on Thursday. Given the
more widespread moderate to heavy rain for this system, flooding
will be more likely across urban areas with rises in smaller
streams/creeks and mainstream rivers likely (especially the Russian
River and Napa River). With the return of moderate to heavy rain and
strong winds, additional power outages and downing of trees is
expected Wednesday night into Thursday.

The biggest threat late Wednesday through Friday will be the
potential for severe weather, including the risk of weak tornadoes
and waterspouts. The SPC has issued a marginal risk of severe
thunderstorms and a 2% chance of tornadoes/waterspouts along our
entire coastline. The highest risk for a weak tornado/waterspouts
will be from embedded thunderstorms within the main rain band as the
cold front passes through our CWA. That being said, guidance shows
the potential for isolated cells to develop in the wake of cold
frontal passage which also display potential for severe thunderstorm
development and rotation. This system looks even more favorable than
the first system with much more instability (higher MUCAPE values
over a much larger area) and continued strong low level shear
between 30 to 45 knots. A marginal risk of severe thunderstorms
continues for the Big Sur coastline into Friday while the rest of
our region has general thunderstorms. The highest potential for
thunderstorms would be along the coastline in the late morning to
afternoon timeframe with the potential for a weak tornado or
waterspout continuing. Make sure you have multiple ways to receive
any warnings that may be issued during both the Tuesday-Wednesday
and late Wednesday-Friday systems in the event that severe
thunderstorms are able to develop. This is the most favorable
environment for severe weather that we have seen in quite a while.

Rain showers continue into Friday before diminishing heading into
the weekend. This does not mean the storm door is closing with long
range guidance showing the potential for additional systems late
December into early January.

&&

.AVIATION...
(18Z TAFS)
Issued at 950 AM PST Tue Dec 23 2025

A few light showers are scattered across the Bay Area with
generally VFR ceilings regionally. Winds are from the south and
will increase through the day, with a dramatic increase overnight
as a strong low pressure system moves up the coast. Most terminals
will have gusts at the surface above 30 kts with strong speed
shear likely as the low level jet moves through in the pre-dawn
hours Wednesday morning. This storm will also bring a period of
moderate rain with heavy downburt possible at times. There is a
slight risk for thunderstorms, but the probability is a little too
low to include VCTS on this round of TAFs. Winds will start to
ease mid-morning Wednesday before another push of wind, rain, and
a better chance for thunderstorms move through starting Wednesday
evening and continuing through Thursday. Some of these
thunderstorms could be strong to severe with damaging wind gusts
and tornados as the primary hazards.

Vicinity of SFO...The biggest question in the short term is when
the strong southerly winds will arrive. So far winds have been
much weaker than anticipated and I delayed the arrival of SE winds
exceeding 12 kts to 00Z. This was quite a change from the 15Z
arrival advertised in the 12Z TAF package. The biggest reason was
that winds remain weak and have not even become SE yet. SFO is
still reporting gentle E to NE wind typical of weak forcing in the
early morning. While the winds may take longer to mix down to the
surface, the winds at 2,500 feet will reach 30 kts by 21Z and
increase to 50 kts by 06Z. These strong winds aloft will likely
cause impacts from low level wind shear. Strong southerly surface
winds will peak around 12Z. The main band of precipitation looks
confined to 09Z-12Z, with showers possible on either side.
Thunderstorms are most likely from 06Z to 12Z, but the probability
remains too low to include VCTS in the TAF for now. This upcoming
storm will quickly clear out Wednesday morning as the rain stops
and winds ease. The break won't last long as another push of
stormy weather moves through starting Wednesday evening. Thursday
morning looks like a better chance for thunderstorms at the
moment.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Southerly winds will increase through the
afternoon, particularly at SNS where the wind direction lines up
with the Salinas Valley. Very strong winds are expected early
Wednesday morning, when SNS may gust to a rare 50 kts. The band
steady rain and possible thunderstorms will move through from
around 08Z to 14Z.

&&

.MARINE...
(Today through Sunday)
Issued at 950 AM PST Tue Dec 23 2025

EXTREMELY HAZARDOUS MARINE CONDITIONS EXPECTED TUESDAY NIGHT.
Winds are currently moderate but conditions will deteriorate over
the next 12 hours. Widespread sustained gale force southerly
winds will arrive tonight with frequents gusts near 60 kts in
exposed waters. These winds will build very rough, steep waves
with a significant wave height near 20 feet. A brief reprieve
will arrive Wednesday before conditions deteriorate again
Wednesday night. If your vessel is not able to handle these
conditions return to port or seek protected waters as soon as
possible.

&&

.BEACHES...
Issued at 429 AM PST Tue Dec 23 2025

The strong winds along the coast will result in hazardous beach
conditions. A Beach Hazards Statement has been issued for the
coast from 4PM Tuesday through 4AM Wednesday. The main concerns
include:blowing and drifting sand and wind waves up to 20 ft. The
drifting sand and increased sea spray will also result in poor
visibilities, affecting water rescues. Increased coastal erosion
will be possible as well.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Flood Watch through Friday evening for CAZ006-508>510-512>518-
     528>530.

     Beach Hazards Statement from 4 PM PST this afternoon through
     late tonight for CAZ006-505-509-529-530.

     Wind Advisory from 4 PM this afternoon to 4 AM PST Wednesday for
     CAZ006-504-506-508-510-512>516-518-528-529.

     Flood Watch through Friday evening for CAZ502>506.

     High Wind Warning from 4 PM this afternoon to 4 AM PST Wednesday
     for CAZ502-503-505-509-517-530.

PZ...Gale Warning until 3 AM PST Wednesday for SF Bay N of Bay Bridge.

     Gale Warning from 3 PM Wednesday to 3 AM PST Thursday for SF Bay
     N of Bay Bridge.

     Gale Warning until 3 AM PST Thursday for Mry Bay.

     Storm Warning until 3 AM PST Wednesday for Pigeon Pt to Pt Pinos
     10-60 NM-Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes
     10-60 NM-Pt Reyes to Pigeon Pt 0-10 nm.

     Storm Warning until 3 AM PST Thursday for Pigeon Pt to Pt Pinos
     0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm.

&&

SHORT TERM...Kennedy
LONG TERM....Kennedy
AVIATION...Flynn
MARINE...Flynn

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The office that day

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

IssuedProductOfficeCountiesLasted
Dec 22, 5:59 PM PSTHigh Wind WarningMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more37 hr
Dec 22, 5:59 PM PSTWind AdvisoryMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more19 hr
Dec 23, 2:18 AM PSTGale WarningMTR26 hr
Dec 23, 2:18 AM PSTSmall Craft AdvisoryMTR7 hr
Dec 23, 4:28 AM PSTBeach Hazards StatementMTRMarin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma72 hr

Nearby

Wind Advisories in California, 2025Every wind advisory in 2025

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.