Mount Hermon, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

426
FXUS66 KMTR 070554
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
954 PM PST Fri Mar 6 2026

...New AVIATION...

.KEY MESSAGES...
Updated at 152 PM PST Fri Mar 6 2026

 - Breezy winds through Saturday

 - Warm weekend with high temperatures 10 to 20 degrees above
   normal

 - Dry conditions through the extended forecast

&&

.UPDATE...
Issued at 855 PM PST Fri Mar 6 2026

The short term forecast is in good shape with just a few passing
high clouds anticipated during the overnight hours. Winds remain
elevated at this hour, though speeds continue to diminish. Clear
skies and a dry airmass should promote ideal radiational cooling,
however, this won`t be the case everywhere. Across the North Bay,
sufficient winds just above the surface may be sufficient to keep
the PBL coupled with the free atmosphere. As such, overnight
temperatures are forecast to be several degrees greater than what
was observed this morning. In fact, 24 hour temperature departures
are anywhere from 5 to 15 degrees greater than this time
yesterday. Across the Central Coast, however, winds are much
lighter and with the persistent offshore flow drying things out,
temperatures here will likely crater into the mid 30s. At this
time, the areal coverage needed for any type of Cold Weather
headline seems marginal (though it is close). As such, we`ll
continue to monitor and mention the potential here in the AFD.

&&

.SHORT TERM...
Issued at 150 PM PST Fri Mar 6 2026
(This evening through Saturday)

All focus remains on the warm up over the weekend. High pressure is
dominating the Eastern Pacific while an upper trough and cutoff low
linger across the desert Southwest and Southern California. This
pattern is having a two fold affect on the Bay Area and Central
Coast forecast. First is the broad area of high pressure over the
East Pacific. While typically a summertime pattern, it is having
summerlike influences on our early spring time. Under this pattern
we expect clear skies and warming conditions. This pattern also
sets up winds out of the North along the coast. When this happens
the area can experience coastal upwelling of cooler subsurface
water. In turn this can lead to sea/land breeze circulation as
well as some low clouds and fog to form in the lowest layers in
the late day and overnight hours. The surface high pressure is
being analyzed by the ocean prediction center at 1037 mb, which is
a decently stout high for March. The second item is that of the
upper trough/cutoff low. This is more of a wind steering items
than anything else. When this pattern sets up, adjacent to the
high pressure over the East Pacific, it takes the winds that would
normally come from the North and veers them toward the Northeast.
This means we can get a bit more offshore flow across the region.
Offshore winds can bring adiabatic warming (downsloping) for many
portions of the area.

This pattern over the weekend will bring the warmth that is
associated with a strong area of high pressure combine with offshore
winds will cause temperatures for Saturday and Sunday to run
anywhere from about 10-20 degrees above normal. Models typically
handle this pattern decently well, but can run a few degrees too
cool at times. Looking at the ensemble envelope we leaned more
towards the 75th percentile of the NBM, but did this with the NBM
EXP. The place that models do not handle well in this pattern is San
Francisco. This is for a few reasons, but the biggest is being a
small piece of land surrounded by water on three sides. We look at
wind direction carefully to give us an idea of what will happen in
SF during these pattern and Saturday morning (some degree Sunday
morning) will see winds at 925 mb from the Northeast at about 30
knots. So far models have been a little weak on the 925 winds. Even
so, with 30 knots and a coupled atmosphere, high temperatures for SF
on Saturday have a good probability (greater than 70%) of
exceeding 80 degrees in a few locations. No models will pick this
up and forecast was manually adjusted to account for this. The
piece to watch will the minimum temperatures for early Saturday
and Sunday morning. If we start near 60 degrees in SF, it is
almost a sure bet that SF will pop into the low to mid 80s. If we
do it again on Sunday morning, the pattern is similar enough that
we could pop again for a short time on Sunday.

Everyone else around the Bay Area, rest assured, you were not
forgotten. Numerical models handle your locations better than they
handle SF. In short, it`s going to be a warm weekend.

&&

.LONG TERM...
Issued at 150 PM PST Fri Mar 6 2026
(Saturday night through next Thursday)

By the time we get late into the weekend and into early next week,
the pattern will shift. The stout high will retreat farther
offshore, the upper trough over the Southwest will pinch off into a
cutoff low over Northern Baja, and a bagginess in the jet stream
will start to encroach upon the Northern portions of our service
area. This will be short lived though as high pressure starts to
reassert itself during the middle of next week. Model really start
to diverge late next week with a few going back to a trough and
bringing the area a chance of rain and several others holding on to
the ridge and maintaining the string of sunny days. As we get
through the weekend we`ll have more to say about late next week.

&&

.AVIATION...
(06Z TAFS)
Issued at 931 PM PST Fri Mar 6 2026

VFR is forecast to prevail at all TAFs over the next 24 to 30
hours. A corridor of stronger winds aloft is forecast between
09Z-15Z across the North Bay. As surface winds continue to
subside, the potential for LLWS will increase. Currently, KSTS
stands the best chance as the core of the strongest winds aloft
stretch from NW to SE. 1-2 hours of LLWS are possible at KAPC, but
confidence isn`t high enough to include. The LLWS potential is
low, but non-zero at KOAK and KHAF. Otherwise, N`ly to NE`ly winds
will increase some through the day on Saturday, but speeds are
anticipated to remain less than 20 knots. Occasional gusts to
above 25 knots cannot be ruled out, but the frequency precludes
mention in the TAFs at this time.

Vicinity of SFO...VFR with WNW`ly winds becoming N`ly to NE`ly
through the day on Saturday. NE`ly winds may persist a little
longer than typical, but speeds are anticipated to remain below 10
knots. A very weak sea-breeze may attempt to progress eastward by
late in the day, but confidence is low to medium. Winds should
become WNW`ly after the passage around 21Z Saturday. Speeds are
still expected to remain below 10 knots, with an occasional gust
to 20 knots.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR conditions with a SE wind between
5-7kts are expected through the morning at KMRY. Around 16Z
Saturday, a light easterly flow between 4-6 kts will push through
before switching back to the NW onshore flow that we`ve been
seeing the past few days.

VFR is also expected at KSNS though there is low confidence on the wind
direction in the beginning and end of the TAF period. However,
there is high confidence that the winds will remain very light
between 1-3 kts until 00Z Saturday. The winds will pick up
slightly and shift to the NW around 5-7 kts before becoming
variable and light again around 03Z.

&&

.MARINE...
(Tonight through next Thursday)
Issued at 855 PM PST Fri Mar 6 2026

Hazardous marine conditions are forecast to persist through the
pre-dawn hours on Saturday. While winds abate through this time,
seas will remain elevated near or just above 10 feet. Seas and
winds will subside on Sunday before elevating on Monday. Strong
northerly breezes and rough to very rough seas are forecast.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 3 AM PST Saturday for Pigeon Pt to Pt
     Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt
     Reyes 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt
     Reyes to Pigeon Pt 0-10 nm.

     Gale Warning until 3 AM PST Saturday for Pt Arena to Pt Reyes 10-
     60 NM.

&&

$$

SHORT TERM...BFG
LONG TERM....BFG
AVIATION...Bain/Navarrete
MARINE...Bain

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