FXUS66 KMTR 251747
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
1047 AM PDT Wed Mar 25 2026
...New AVIATION...
.KEY MESSAGES...
Updated at 1111 PM PDT Tue Mar 24 2026
- Slightly above normal temperatures persist into the weekend
- Increasing potential for light rain returning early to mid
next week
- Moderate offshore winds across the North Bay Interior
Mountains Thursday into Friday
&&
.SHORT TERM...
Issued at 1111 PM PDT Tue Mar 24 2026
(Tonight through Thursday)
Satellite shows some high level clouds moving over the North Bay
with stratus building in across the coastal waters. An upper level
trough will push through southern California today which, in
combination with a weak cold frontal passage this afternoon, will
deepen our marine layer to around 750-1000 ft. There is some
potential for stratus to develop along our coast tonight but high
resolution guidance suggests the stratus bank will be relatively
progressive with cloud cover dissipating almost as quickly as it
develops. Temperatures remain cool overnight with lows in the 40s to
50s.
Slightly cooler high temperatures are expected today as a weak
surface cold front moves through the Bay Area. This will keep
interior temperatures in the 70s and coastal temperatures in the
60s. The interior Central Coast continues to be on the warmer side
with high temperatures in the low 80s. It is expected to be a dry
cold frontal passage with no potential for precipitation across the
region. However, it will bring locally gustier onshore winds across
the marine environment, the coastline, and across the higher
elevations. Winds stay below Wind Advisory criteria but will be
between 20-30 mph along the coast and 25-35 mph across the higher
elevations. The strongest winds largely remain over the coastal
waters where gale force winds are expected. If you are looking to go
out on the ocean this week be aware that winds, particularly across
the outer waters, will make conditions hazardous for small boats.
&&
.LONG TERM...
Issued at 1111 PM PDT Tue Mar 24 2026
(Thursday night through next Tuesday)
Heading into Thursday, upper level ridging redevelops across the
West Coast. At the surface high pressure builds in over the Pacific
Northwest and gradually spreads into the Intermountain West. The SFO-
WMC pressure gradient shifts from positive (onshore winds) to
negative (offshore winds) as this occurs Wednesday night into
Thursday. The SFO-WMC gradient is forecast to reach -10 to -11 mb on
Thursday which correlates to moderate offshore winds. Forecast wind
gusts are expected to peak between 30 to 40 mph. Wind gusts will be
strongest strongest over the higher elevations with winds peaking
along the ridgelines of the North Bay Interior Mountains. Offshore
winds bring drier and warmer conditions so expect RH values to drop
across the higher terrain on Thursday. Larger fuels are drying but,
for now, they remain decently moist from rain over the past few
months. Smaller fine fuels (grass) are drying at a faster rate due
to the recent abnormally hot weather. The overall fire risk remains
low at this time but remember to exercise caution given the drying
of fine fuels. High temperatures on Thursday warm by a few degrees
but largely stay in the upper 70s to low 80s across the interior and
60s along the coast.
Temperatures Friday into the weekend will look fairly similar to
Thursday but may fluctuate slightly as we get closer in time. Sunday
into Monday a deep upper level trough will reach the West Coast and
start to push inland. Cluster guidance maintains some uncertainty as
to when this trough will arrive. All clusters show the trough just
offshore on Monday and Tuesday with it pushing inland closer to
Wednesday/Thursday. Rain chances increase starting Tuesday with
light rain to return across the Bay Area and Central Coast. It is
too far out to talk rainfall totals but ensembles are generally
supporting between 0.5" to 1.0" of rain next week. Temperatures are
also expected to cool down Monday and Tuesday with highs dropping
into the 60s to 70s on Monday and widespread 50s to 60s on Tuesday.
&&
.AVIATION...
(18Z TAFS)
Issued at 1046 AM PDT Wed Mar 25 2026
The low clouds and fog from this morning have dissipated, with
satellite imagery now showing high level clouds passing overhead.
Expect VFR conditions to continue through the period, with the
most notable forecast change being an increase in winds. Winds
ramp up this afternoon and evening bringing gusts in the 15-25kt
range for interior valleys and gustier conditions up to 25-30kt
near the coast, perhaps locally higher. Winds will begin to ease
late tonight and into Thursday morning.
Vicinity of SFO...The stratus flirted with KSFO this morning, but
has cleared. Now high clouds filter overhead while northwest winds
of 10-15kt hold. Increasing winds are expected this afternoon with
gusts peaking around 20-25kt and near 25-30kt between 04-08Z. Winds
gradually ease overnight and should fall to 5-10kt around sunrise,
plus or minus a few hours. VFR conditions expected.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...Onshore flow will increase today, leading
to a period of breezy winds this afternoon and evening of 15-20kt,
perhaps a few gusts to 25kt. Closer to the immediate coast, stronger
gusts of 25-30kt are expected. Winds gradually decrease late tonight
and into Thursday morning.
&&
.MARINE...
(Today through Monday)
Issued at 849 AM PDT Wed Mar 25 2026
Northerly breezes will become strong to near gale this afternoon
and evening, which will bring widespread hazardous conditions.
Gale force gusts will occur across the inner waters and outer
waters with bays experiencing conditions hazardous to small craft.
Seas will build to become rough to very rough as a result.
Conditions will slowly improve Friday and into the weekend with
moderate northerly breezes and moderate seas.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this
evening for Mry Bay-SF Bay N of Bay Bridge.
Small Craft Advisory until 3 PM PDT this afternoon 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.
Gale Warning from 3 PM this afternoon to 3 AM PDT Thursday for
Pt Arena to Pt Reyes 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.
Small Craft Advisory until 9 PM PDT Thursday for Pigeon Pt to Pt
Pinos 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm.
Gale Warning from 3 PM this afternoon to 9 AM PDT Friday for Pt
Arena to Pt Reyes 10-60 NM.
Gale Warning from 3 PM this afternoon to 9 AM PDT Thursday for
Pigeon Pt to Pt Pinos 10-60 NM.
&&
$$
SHORT TERM...Kennedy
LONG TERM....Kennedy
AVIATION...KR
MARINE...KR
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Prepared by Boulder-Creek.com Weather at: Wed Mar 25 12:30:04 PDT 2026
From the National Weather Service
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