FXUS66 KMTR 171926
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
1226 PM PDT Fri Jul 17 2026
...New SHORT TERM, LONG TERM...
.KEY MESSAGES...
Updated at 1225 PM PDT Fri Jul 17 2026
- Cooler and more humid conditions through early next week
- The marine layer prevails through the weekend
&&
.SHORT TERM...
Issued at 1225 PM PDT Fri Jul 17 2026
(This evening through Saturday night)
A marine layer around 1,200 feet in depth resulted in inland
intrusion of stratus overnight. That said, current satellite
trends are show these clouds doing their typical afternoon retreat
to the coast. Afternoon temperatures will be as much as 10 deg F
below seasonal average, especially in the lower elevations.
Overnight, expecting stratus to return to the coast this evening
and penetrate into the inland valleys into early Saturday morning.
This is typical for the month of July. Once low clouds retreat
back to the coast by mid-to-late morning on Saturday, mostly sunny
skies are forecast for the afternoon highs again slightly below
average. Rise and repeat for Saturday night.
&&
.LONG TERM...
Issued at 1225 PM PDT Fri Jul 17 2026
(Sunday through next Thursday)
Still keeping an eye on conditions late this weekend into early
next week as there is some uncertainty with regards to the
placement of the ridge to the east and troughing to the west. The
location of these feature will ultimately drive how much mid-to-
upper level moisture we receive from the tropics and monsoon. We
will continue to monitor this moisture and Convection-Allowing
Models (CAMs) over the weekend to see if their are any singles for
convection. Be sure to check back for the latest forecast
information.
&&
.AVIATION...
(18Z TAFS)
Issued at 1040 AM PDT Fri Jul 17 2026
Low clouds and patching fog are quickly clearing at this hour.
Anticipate VFR conditions through the afternoon with an early
return of low clouds late this afternoon to early evening. A
deepening marine layer will allow for further inland penetration
of the stratus deck overnight. Moderate to high confidence of MVFR
ceiling across all area terminals tonight. local IFR conditions
possible over coastal terminals and KSTS. Diurnal winds will
prevail.
Vicinity of SFO...Rapid clearing will bring VFR conditions to
area terminal in the next hour. High confidence on the return of
the MVFR ceiling tonight.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...Rapid clearing will bring VFR conditions
to area terminal in the next hour or so. High confidence of
marginal IFR/MVFR returning to the terminals tonight.
&&
.MARINE...
(Today through Wednesday)
Issued at 913 AM PDT Fri Jul 17 2026
Moderate northwesterly breezes will ease through this afternoon
and evening. Small craft advisory conditions will gradually taper
off this afternoon and evening across most areas with exception to
the waters north of Point Reyes and along the immediate coast
south of Point Pinos. Moderate to rough seas will persist through
today. Conditions improve Saturday as seas abate and northwesterly
winds diminish.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 9 PM PDT this evening for Pt Arena to
Pt Reyes 0-10 nm.
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.
Small Craft Advisory until 3 PM PDT this afternoon for Pigeon Pt
to Pt Pinos 10-60 NM.
&&
$$
SHORT TERM...RGass
LONG TERM....RGass
AVIATION...CW
MARINE...CW
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Prepared by Boulder-Creek.com Weather at: Fri Jul 17 12:30:03 PDT 2026
From the National Weather Service
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