FXUS66 KMTR 121136
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
436 AM PDT Sun Apr 12 2026
...New AVIATION, MARINE...
.KEY MESSAGES...
Updated at 1229 AM PDT Sun Apr 12 2026
- Scattered light showers with a slight chance of thunderstorms
today will linger into early Monday
- A gradual warming and drying trend returns through the
remainder of extended forecast
- Gusty winds, especially at higher elevations Wednesday and
Thursday
&&
.SHORT TERM...
Issued at 1229 AM PDT Sun Apr 12 2026
(Today and tonight)
The center of the upper level low will continue to slowly move
onshore through the overnight as a secondary trough on the backside
of the low shifts south well offshore today. Scattered weak showers
offshore will drift onshore overnight, followed by scattered light
showers, primarily over the North Bay after sunrise this morning and
over the coastal ranges. Coverage of light showers will begin to
increase once again by late morning into the afternoon as an upper
trough axis shifts east-southeast across our area. There is a slight
chance of thunderstorms after sunrise especially from areas where
upslope flow will provide extra lift near the coastal ranges and
eastern half of our forecast area. Temperatures will be slightly
cooler than today, mostly from the mid-50s to mid-60s. Shower
activity should mostly taper off by sunset. Rain totals will be
light through the day, with up to a 0.25" for low lying areas, and
up to 0.75" at higher elevations.
&&
.LONG TERM...
Issued at 1229 AM PDT Sun Apr 12 2026
(Monday through Saturday)
Monday morning will feature some lingering offshore showers that may
drift into Monterey County with only a few hundredths of rain
expected where it does rain. By Tuesday, low amplitude ridging will
begin a pleasant gradual warming trend. A sharpening trough axis
extending southwest from a developing system from the Pacific
Northwest into the Great Basin will produce a 'back door slider'
pattern for the second of the week. Gusty west winds at higher
elevations on Wednesday will become northerly and the strongest
gusts appear to not exceed 40 MPH attm. Thursday, gusty winds will
become northerly behind the 'back door slider' trough axis, with the
downsloping component of the winds not impacting temperatures behind
the dry frontal boundary pushing south through our area Thursday
afternoon. Another round of shortwave ridging Friday will
temperatures jump around 5 degrees into the low/mid 70s inland and
low to mid 60s along the coast, and more gradual warming through the
weekend.
&&
.AVIATION...
(12Z TAFS)
Issued at 435 AM PDT Sun Apr 12 2026
Scattered showers continue and increase in frequency into the mid
morning with winds becoming more moderate to breezy. Scattered to,
at times, broken low clouds linger through the morning with more
coverage from mid-level clouds through the day. Winds become more
moderate to breezy as shower chances increase into the mid morning
with some slight chances for isolated storms possible. Storm chances
erode into the evening with winds reducing and showers becoming
lighter and spottier. Shower activity ends into the night for the
North Bay, but the rest of the region will see shower activity
linger into Monday morning.
Vicinity of SFO...Expect mostly mid level clouds through the day.
Light to moderate southerly winds with passing showers last through
the mid morning before breezier southwest winds build. This increase
in winds will come along with increasing shower chances and slight
chances for storms. Showers and storm chances reduce into the
afternoon and evening. Expect gusts to fall off in the mid-evening
and winds continue to reduce into the night. Shower activity will
linger into early Monday, but exits as moderate northerly winds
arrive.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...Scattered shower chances increase onto the
mid morning with prevailing mid-level clouds and scattered lower
clouds. Winds become more moderate to breezy into the late morning
and early afternoon. Shower chances and winds reduce into the
evening. Winds remain light into the night, but shower activity
increases slightly into the late night and lasts beyond the TAF
period.
&&
.MARINE...
(Today through Friday)
Issued at 435 AM PDT Sun Apr 12 2026
Showers and isolated storms move through the waters through the
day with lingering showers possible into early Monday. Showers
and storms could provide locally strong and gusty winds.
Widespread breezy winds begin to ease into the evening and become
lighter into the night. Winds continue to ease and seas abate
into the work week.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 3 PM PDT this afternoon for Mry Bay-
Pt Arena to Pt Reyes 10-60 NM-Pt Reyes to Pigeon Pt 0-10 nm-
SF Bay N of Bay Bridge.
Small Craft Advisory until 9 AM PDT this morning for Pigeon Pt
to Pt Pinos 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm.
Small Craft Advisory until 9 PM PDT this evening for Pigeon Pt
to Pt Pinos 10-60 NM.
&&
$$
SHORT TERM...JM
LONG TERM....JM
AVIATION...Murdock
MARINE...Murdock
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Prepared by Boulder-Creek.com Weather at: Sun Apr 12 08:30:02 PDT 2026
From the National Weather Service
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