San Quentin, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

784
FXUS66 KMTR 161755
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1055 AM PDT Fri May 16 2025

...New AVIATION, MARINE...

.SYNOPSIS...
Issued at 250 AM PDT Fri May 16 2025

Wind and cooler temps on tap for the weekend as a potent system
enters the Great Basin. Warm and dry with fair weather expected
mid-next week.

&&

.SHORT TERM...
(Today and tonight)
Issued at 250 AM PDT Fri May 16 2025

Another quintessential California day on the docket with mostly
clear skies and breezy northwest flow. A quick check of the
nighttime satellite shows some upper level cloudiness moving
through the region associated with a subtle shortwave trough. This
will likely lend a hand to some elevated cloud layers through this
afternoon, but shouldn`t cause any concern.

&&

.LONG TERM...
(Saturday through Thursday)
Issued at 250 AM PDT Fri May 16 2025

By late Friday night we will start to see the impacts of a potent
system progged to dig into the Great Basin. Gusty NW winds are
expected to develop by midday Saturday lasting through Sunday
evening. Confidence in the overall pattern is high as ensemble
guidance has largely held steady for the past few days. One big
change this morning, however. The latest guidance depicts a more
open wave, which would ultimately lead to the upper low ejecting
out into the Central Plains a bit earlier than previously
expected. Where previous forecasts called for offshore winds
through Monday morning, this morning`s forecast package advertises
less of an offshore wind component. Still looking at gusty N/NW
winds early Monday morning, which will result in downsloping
winds in the higher terrain of the interior North Bay. This will
still lead to elevated fire danger for these areas through Monday
where humidities will be low due to compressional heating and
continental airmass influence. All in all, winds look to gust
into the 30-40 mph range across inland areas and 40-50 mph along
the coast and favored NW-SE oriented valleys and gaps. A longwave
ridge pattern is restored by the middle of next week, promoting a
drying trend and high temps warmer than seasonal normals.

&&

.AVIATION...
(18Z TAFS)
Issued at 1055 AM PDT Fri May 16 2025

It`s VFR except for a lingering patch of stratus over the Monterey
Bay. VFR prevailing today with VFR extending into the evening,
otherwise increasing coastal stratus and patchy fog /IFR-MVFR/
tonight and Saturday morning with patchy light coastal drizzle
possible. Gusty northwest winds aloft resulting in low level wind
shear over KSTS Airport 12z-17z Saturday morning.

Vicinity of SFO...VFR. Light northeast wind until early afternoon
then shifting to westerly and increasing with gusts near 30 knots
during the afternoon and evening. Gusty westerly wind tonight and
Saturday.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...MVFR-VFR improving to VFR by early afternoon
under diurnal surface warming and mixing winds. MVFR due to coastal
stratus developing tonight, a few patches of light drizzle are possible
as well. MVFR Saturday morning. Onshore winds 5 to 15 knots, strongest
during the afternoon and early evening.

&&

.MARINE...
(Today through Wednesday)
Issued at 1045 AM PDT Fri May 16 2025

Gusty to strong northwest winds will continue over the coastal
waters today through the weekend, including much of early to mid
next week. Hazardous marine conditions with rough to very rough
seas will continue through Tuesday night.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory from 3 PM this afternoon to 3 PM PDT
     Saturday for Mry Bay-SF Bay N of Bay Bridge.

     Gale Warning until 3 PM PDT Saturday for Pt Arena to Pt Reyes 0-
     10 nm-Pt Arena to Pt Reyes 10-60 NM-Pt Reyes to Pigeon Pt 0-
     10 nm.

     Small Craft Advisory until 3 PM PDT Saturday for Pigeon Pt to Pt
     Pinos 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm.

     Gale Warning until 3 AM PDT Saturday for Pigeon Pt to Pt Pinos
     10-60 NM.

&&

$$

SHORT TERM...Behringer
LONG TERM....Behringer
AVIATION...Canepa
MARINE...Canepa

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