FXUS66 KMTR 131827
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
1127 AM PDT Mon Apr 13 2026
...New SHORT TERM, LONG TERM...
.KEY MESSAGES...
Updated at 1125 AM PDT Mon Apr 13 2026
- Slightly cooler to near normal temperatures through Thursday
- Periods of gusty winds, especially at higher elevations
Wednesday through Friday
- Warmer temperatures return Friday and Saturday before unsettled
weather returns for early next week
&&
.SHORT TERM...
Issued at 1125 AM PDT Mon Apr 13 2026
(This afternoon through Tuesday)
Lingering rain showers persist over the Pacific late this morning
with these forecast to diminish through the afternoon and evening.
The RRFS (rapid refresh forecast system) and other CAMs (convection-
allowing models) indicate the potential for isolated rain showers
across the higher terrain of the southern Diablo Range and Santa
Lucia Range this afternoon, diminishing as the sunsets. Otherwise,
mostly dry conditions return to the region this afternoon with
afternoon temperatures forecast to be in the upper 50s to low 60s
near the coast and low-to-upper 60s across the interior. However,
the highest peaks may not reach much above the upper 40s to low 50s.
Tonight, temperatures will be chilly across the interior North Bay
Valleys and interior Central Coast with mid-to-upper 30s expected.
There is a low end potential for frost, yet widespread coverage in
not currently anticipated. Elsewhere, temperatures will range from
the low 40s to near 50 degrees F (warmest near the coast).
For Tuesday, expecting dry conditions with temperatures warming
regionwide by a few degrees as a shortwave ridge builds in wake of
the exiting trough.
&&
.LONG TERM...
Issued at 1125 AM PDT Mon Apr 13 2026
(Tuesday night through next Sunday)
Additional warming is expected on Wednesday, but only again by a few
degrees. All of this is ahead of an approaching frontal boundary
that is forecast to be mostly dry. However, there are chances across
far northern Napa and Sonoma counties Wednesday afternoon and
evening, generally less than 25%. This said, there very well may be
light precipitation as far south as the Central Coast as the front
moves across the region late Wednesday evening and into early
Thursday morning. Little to no measurable rainfall expected with
this system.
In wake of this system, offshore winds are forecast to be strongest
across the North Bay Mountains and East Bay hills Thursday and into
Friday. This will be as the exiting system shifts into the Great
Basin and/or Intermountain West. There still is some uncertainty
with the exact track of this system, thus less confidence in the
strength of offshore winds. However, widespread wetting rainfall
across the region has greatly reduced fire weather concerns (at
least in the short term).
Weak ridging will build in behind the aforementioned system on
Friday and Saturday with temperatures returning to near seasonal
averages along with dry weather. Unsettled weather looks to return
late Saturday and into early next week as another mid/upper level
trough drops out of the Gulf of Alaska and approaches the West
Coast.
&&
.AVIATION...
(18Z TAFS)
Issued at 1052 AM PDT Mon Apr 13 2026
Fair weather CU will be the name of the game today with mostly VFR
and an occasional MVFR cloud drifting over the terminals. VFR
through early this evening. Lower confidence on CIGS tonight, but
enough residual moisture and offshore clouds will bring MVFR cigs
back late tonight and early Tuesday.
Vicinity of SFO...VFR. MVFR cigs return during the Tuesday AM rush
around 13-15Z. VFR returns by Tuesday afternoon.
SFO Bridge Approach...Less clouds over the Bay today.
Monterey Bay Terminals...VFR and onshore flow. MVFR cigs return
tonight.
&&
.MARINE...
(Today through Saturday)
Issued at 1052 AM PDT Mon Apr 13 2026
Rain showers linger through the morning before diminishing into
the afternoon. Winds stay light through early afternoon,
increasing to a moderate to fresh northwesterly breeze through
Wednesday. Winds build again on Thursday leading to near gale
force gusts into the end of the work week. Moderate seas continue
through Wednesday before rough seas arrive on Thursday.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory from 3 PM this afternoon to 3 AM PDT
Wednesday for Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt
Reyes 10-60 NM.
Small Craft Advisory from 3 PM this afternoon to 3 AM PDT
Tuesday for Pt Reyes to Pigeon Pt 0-10 nm.
Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this
evening for Pt Pinos to Pt Piedras Blancas 0-10 nm.
Small Craft Advisory from 3 PM Tuesday to 3 AM PDT Wednesday for
Pt Pinos to Pt Piedras Blancas 0-10 nm.
&&
$$
SHORT TERM...RGass
LONG TERM....RGass
AVIATION...MM
MARINE...RGass
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Prepared by Boulder-Creek.com Weather at: Mon Apr 13 14:30:02 PDT 2026
From the National Weather Service
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