FXUS66 KMTR 180720
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1220 AM PDT Sat Jul 18 2026

...New SHORT TERM, LONG TERM...

.KEY MESSAGES...
Updated at 1225 PM PDT Fri Jul 17 2026

 - Steady or slightly warmer temperatures and more humid through 
   early next week

 - The marine layer prevails through the weekend

&&

.SHORT TERM...
Issued at 1220 AM PDT Sat Jul 18 2026
(Today and tonight)

Onshore winds continue with coastal stratus and patchy mist/fog 
moving inland this morning. Strong high pressure remains located 
over the interior west and an upper level trough remains located 
over the eastern Pacific. High clouds may arrive here today from 
monsoonal moisture located over the Southwest. Daytime highs today
will vary from the mid to upper 60s along the coast to the 70s 
bayside to the 80s and 90s well inland. Tonight lows will cool to 
the 50s except in the 60s in the hills and mountains.

&&

.LONG TERM...
Issued at 1220 AM PDT Sat Jul 18 2026
(Sunday through Friday)

Mid and high clouds will increase early next week as higher 
precipitable water (pw) arrives with the eventual northward 
moving remnants of Elida. Elida is currently a tropical storm ~ 
1100 miles south of Point Conception, but the storm is forecast 
to weaken far before reaching higher latitudes. At this time most
model forecasts are forecasting minimal convective potential early
next week. Daytime highs are forecast to be near to slightly 
above normal next week.

&&

.AVIATION...
(06Z TAFS)
Issued at 948 PM PDT Fri Jul 17 2026

MVFR-IFR conditions across the interior with the potential for fog
and LIFR conditions directly along the coast. Stratus is expected
to fill in across the region over the next 2-3 hours with patchy
stratus potentially reaching LVK during the early morning hours.
Highest confidence in MVFR CIGs across the region due to the 
depth of the marine layer but models indicate IFR conditions may 
be possible later tonight. Fog is possible along the coast with 
the potential for dense fog to form. Expect interior clearing by 
mid to late morning with clouds sticking around longer along the 
coast. Diurnally breezy winds continue during the 
afternoon/evening with lighter winds overnight.

Vicinity of SFO...MVFR-IFR conditions overnight. Stratus will
remain in place over SFO through mid to late morning with a low
potential for fog to develop during the early morning hours.
Breezy afternoon/evening winds before an early return of stratus
during the evening hours.

SFO Bridge Approach...Stratus is taking longer to fill in over the
bay than over OAK or SFO. Guidance indicates stratus should fill
in over the SFO bridge approach by the early morning hours then
clear by mid/late morning.

Monterey Bay Terminals...IFR-LIFR conditions possible overnight.
High resolution guidance highlights the potential for reduced
visibilities and fog tonight with fog more likely after 12Z. TAFs
are more optimistic with clearing between 18-20Z but there is some
uncertainty as to it MRY will clear. Breezy afternoon/evening
onshore winds continue before weakening overnight.

&&

.MARINE...
(Tonight through next Thursday)
Issued at 948 PM PDT Fri Jul 17 2026

Winds have eased across the coastal waters with occasional fresh
to strong gusts possible across the far northern outer waters and
along the Big Sur coast through early Saturday. Moderate seas and
moderate winds continue through midweek. Southerly swell will
increase along the coast next week due to Tropical Storm Elida
moving northwards in the eastern Pacific.

&&

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

&&

$$

SHORT TERM...Canepa
LONG TERM....Canepa
AVIATION...Kennedy
MARINE...Kennedy

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Prepared by Boulder-Creek.com Weather at: Sat Jul 18 00:30:04 PDT 2026