Angwin, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

940
FXUS66 KMTR 061135
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
435 AM PDT Tue Oct 6 2026

...New AVIATION, MARINE...

.KEY MESSAGES...
Updated at 155 AM PDT Tue Oct 6 2026

 - Hazardous heat inland persist through Thursday, never leave
   children or pets in unattended vehicles!

 - Elevated fire weather conditions persist in the interior
   through Thursday

 - Coastal flooding concerns due to astronomical tides and
   thermal expansion through the weekend

 - Hazardous beach conditions along Pacific coastline later this
   week into the weekend due to long period swell

&&

.SHORT TERM...
Issued at 155 AM PDT Tue Oct 6 2026
(Today and tonight)

A shallow and compressed marine layer confined to the coast most of
Monday afternoon has made some slight progress inland over the
Russian River Valley, city of San Francisco and Monterey Bay into
the Salinas Valley into the overnight hours. The low
ceilings/patchy fog may limit visibility down to 1/2mi or less
overnight into early Tuesday morning. The ridging pattern over our
area will continue to be reinforced today and tonight in the wake
of the weak disturbance that shifted east yesterday. Moderate
HeatRisk continues to be the primary concern in the short term
forecast along with elevated fire weather conditions, especially
for higher elevation locations due to hot and dry conditions.

Follow these tips to avoid heat exhaustion and heatstroke:

* Stay hydrated and drink plenty of fluids.
* Wear lightweight, light-colored clothing.
* Reduce time spent outdoors or stay in the shade.
* Never leave people or pets unattended in vehicles.
* Use sunscreen if going to the coast or the pool.

&&

.LONG TERM...
Issued at 155 AM PDT Tue Oct 6 2026
(Wednesday through Monday)

Wednesday and Thursday will see similar temperatures as today,
however improved onshore flow developing during the day on Thursday
will mark the beginning of a return to more normal or slightly
below normal temperatures for Friday into the weekend. Another
weak upper level disturbance will develop offshore similar to this
past weekend, however its fate appears to be a merger with the
remnants of Rachel. While Rachel and that disturbance merge, a
more potent trough embedded in the Polar Jet will lift Rachel`s
remnants into the desert southwest while providing us with a
potential `inside slider`. Whether the energy associated with the
Polar Jet increases onshore flow (deterministic GFS) or an inside
slider (deterministic ECMWF), we`re going to see dry and gusty
winds develop over the weekend potentially increasing fire
weather concerns, with the inside slider scenario possibly leading
to another warm- up. The gusty winds over the East Bay may
approach wind advisory levels Saturday morning albeit at high
elevations. Unfortunately we continue to be dry through the
extended forecast.

&&

.AVIATION...
(12Z TAFS)
Issued at 434 AM PDT Tue Oct 6 2026

Currently LIFR-VFR. Subsidence aloft is supporting a compressed
marine layer that is too shallow to penetrate inland, leading to
high confidence in VFR prevailing for bayshore and interior
terminals. It`s also bringing dense fog along the coast with high
confidence in LIFR conditions continuing through 15Z for the coastal
terminals of HAF, MRY, and SNS. Conditions will improve by late-
morning with LIFR stratus potentially lingering off the coast this
afternoon. Dry air upstream is leading to uncertainty as it cleared
stratus earlier, but now stratus is reforming. It`s not expected to
impact this morning`s forecast, but it is leading to lower
confidence (40%) in the return of LIFR conditions to coastal
terminals tonight. Diurnal winds will prevail.

Vicinity of SFO...Currently VFR with westerly flow. High confidence
in VFR and diurnal winds prevailing.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Currently LIFR and calm at both terminals.
High confidence in LIFR conditions in the form of dense fog
prevailing through 15Z. Conditions will improve through mid-to-late
morning with VFR expected by 18Z. Diurnal winds will prevail. Low to
moderate confidence on LIFR conditions returning tonight due to dry
air upstream and light offshore flow overnight.

&&

.MARINE...
(Today through Sunday)
Issued at 434 AM PDT Tue Oct 6 2026

A gentle to moderate northerly breeze will prevail through
Thursday. Northerly breezes increase to become strong to very
strong Friday into Saturday, bringing widespread hazardous
conditions for small craft. Frequent gale force gusts are likely
across the northern waters during this time. Moderate seas will
prevail through Thursday, building to become rough to very rough
Friday into Saturday.

&&

.FIRE WEATHER...
Issued at 306 AM PDT Mon Oct 5 2026

Strong ridging aloft will lead to hot and dry conditions through
Thursday with elevated fire weather conditions across the higher
elevations. Poor to very poor overnight humidity recoveries will
continue across the thermal belts with pushes of offshore flow
each morning. Hazardous heat will continue through Thursday with
major to extreme risks of heat-related illnesses across most
mountain ranges. A pattern change later this week will bring
cooler conditions to the region.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Dense Fog Advisory until 9 AM PDT this morning for CAZ006-505-
     509-529-530.

     Heat Advisory until 10 PM PDT Thursday for CAZ503-504-506-508-
     510-512>518.

     Coastal Flood Advisory until 1 PM PDT Thursday for CAZ506.

PZ...Dense Fog Advisory until 9 AM PDT this morning for Mry Bay.

&&

$$

SHORT TERM...DialH
LONG TERM....DialH
AVIATION...Sarment
MARINE...Sarment

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