FXUS66 KMTR 170703
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1203 AM PDT Fri Apr 17 2026

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

.KEY MESSAGES...
Updated at 1201 AM PDT Fri Apr 17 2026

 - Periods of gusty offshore winds, especially at higher
   elevations, continue through early this morning

 - Seasonably warm temperatures expected today through the 
   weekend

 - Cooler temperatures and beneficial rain for the beginning of
   next week

&&

.SHORT TERM...
Issued at 1201 AM PDT Fri Apr 17 2026
(Today and tonight)

Offshore flow produced gusty winds across our area today, but 
especially higher elevations of the North Bay and East Bay Hills.
The highest measured wind gust was at Mt St Helena (~4400ft) shortly 
after 3pm at 63mph, but is still gusting at 57mph late tonight. The 
fetch of offshore flow will persist overnight through mid-morning 
Friday as the upper trough responsible continues moving east. 
Overnight lows from the East Bay Hills south through San Benito and 
Monterey County will be chilly, especially at higher elevations, 
where winds aloft are weaker and more efficient radiational cooling 
will occur under clear skies. Morning winds will gradually ease by 
the afternoon as progressive ridging approaches the West Coast. 
Temperatures will jump about 5 degrees inland, and remain similar to 
yesterday along the coast as weak onshore flow is reestablished.

&&

.LONG TERM...
Issued at 1201 AM PDT Fri Apr 17 2026
(Saturday through Thursday)

Overnight lows tonight into Saturday morning will shift closer to 
normal as the progressive upper ridge moves across our area and 
gradually amplifies as it moves east. Temperatures will be in the 
mid-70s to near 80 inland, once again not much increase along the 
coast with onshore flow. Deterministic guidance is still struggling 
with the evolution and timing of the developing offshore 
disturbance. Sunday now looks dry and relatively pleasant, just 
slightly cooler as cloud cover increases out ahead of the upper low. 
The North Bay is likely to receive rainfall Monday, however there is 
plenty of uncertainty for the remainder of our area wrt to the 
initial ave ejecting east onshore. Tuesday has the best chance for 
scattered showers and possible thunderstorms, especially if the 
trough becomes negatively tilted by Tuesday morning. Scattered 
showers may linger into Wednesday, with no clear signal for what the 
pattern looks like beyond the extended forecast.

&&

.AVIATION...
(06Z TAFS)
Issued at 1009 PM PDT Thu Apr 16 2026

VFR is expected to prevail through the forecast period. Enhanced offshore
flow aloft is producing LLWS out of the northeast for the North
Bay terminals and farther south into KOAK.

Vicinity of SFO...VFR is expected to prevail through the forecast
period. Expect northeast LLWS aloft through the overnight into 
Friday morning, especially at KOAK.

SFO Bridge Approach...Similar as SFO.

Monterey Bay Terminals...Expect VFR through the TAF period with
offshore flow overnight, returning back to onshore by late
morning.

&&

.MARINE...
(Tonight through next Wednesday)
Issued at 1009 PM PDT Thu Apr 16 2026

Gale force winds have eased over our northern outer waters this
evening. Strong winds will persist through Friday morning with
hazardous conditions persisting across our outer waters and
continued choppy conditions for inner waters and bays. Winds will
ease further by Friday afternoon into Saturday with seas gradually
subsiding.

&&

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

&&

$$

SHORT TERM...JM
LONG TERM....JM
AVIATION...JM
MARINE...JM

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Prepared by Boulder-Creek.com Weather at: Fri Apr 17 02:30:02 PDT 2026