Walnut Creek, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

236
FXUS66 KMTR 071750
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1050 AM PDT Sat Jun 7 2025

...New AVIATION, MARINE...

.SYNOPSIS...
Issued at 1244 AM PDT Sat Jun 7 2025

Generally stable conditions through the middle of next week with
seasonally warm temperatures inland, cooler temperatures along the
coast, and morning clouds throughout the coast and the inland
valleys. A cooling trend arrives for the end of next week.

&&

.SHORT TERM...
(Today and tonight)
Issued at 1244 AM PDT Sat Jun 7 2025

The general weather situation remains remarkably stable today, with
an upper level ridge to our north and a weak closed low off the
California coast. Satellite imagery is showing stratus across the
coast, building inland across the Sonoma County valleys, the Bayside
East Bay, and the northern Salinas Valley. Expect the stratus to
continue building inland through the morning hours, with the inland
areas clearing out by the afternoon while low clouds linger at the
immediate coast. Today`s forecast high temperatures are generally
similar to yesterday`s, with highs in the lower to middle 80s in the
interior valleys, as high as the middle 90s in the southern reaches
of Monterey County, around the upper 60s to the upper 70s in the
Bayshore, and the lower to middle 60s along the Pacific coast. An
onshore breeze is expected this afternoon and evening with gusts of
20-30 mph through the gaps, passes, and the northern Salinas
Valley.

&&

.LONG TERM...
(Sunday through Friday)
Issued at 1244 AM PDT Sat Jun 7 2025

In light of the stable pattern over the next few days, the long term
forecast discussion will be given via a series of haikus:

Extended outlook,
Weather remains quite stable
Through middle next week.

Upper level ridge
Moves through Pacific Northwest
Before eroding.

Cutoff low will drift
Off coast of California
Until Sunday night.

Deeper open trough
Arrives middle of next week
From Gulf of AK.

Cooling trend shall come
As the trough builds over us
Through end of next week.

CPC suggests
Seasonal to cool temps reign
Beyond seven days.

&&

.AVIATION...
(18Z TAFS)
Issued at 1050 AM PDT Sat Jun 7 2025

The marine layer persists at around 1,000 feet this morning with a
mix of IFR/MVRF ceilings anticipated to retreat to the coast by late
morning or early afternoon. A similar pattern will prevail with an
increase in onshore flow this afternoon, easing a bit overnight.
High confidence for low ceilings (IFR/MVFR) return late this evening
around the Monterey Bay terminals and then by early Sunday morning
for the Bay Area terminals, similar to this morning. However, there
is low confidence for LIFR fog and ceilings across much of the
region overnight and into Sunday morning.

Vicinity of SFO...IFR/MVFR ceilings linger across the region late
this morning with mostly clear sky conditions expected this
afternoon. Onshore winds are expected to increase this afternoon to
between 15-20kt and begin to ease late this evening and into early
Sunday morning. High confidence for IFR/MVFR ceilings to return
early Sunday morning (similar to this morning). However, confidence
for LIFR ceilings and/or fog is low during this timeframe.  Low
ceilings and/or fog that do develop will dissipate once again by
late morning or early afternoon on Sunday.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...IFR/MVFR ceilings linger across the region
this morning but are anticpated to dissipate or scatter out by 18Z-
20Z. Onshore flow will return by this afternoon with low clouds
retreating to the coast. There is high confidence for IFR/MVFR
ceilings to return late this evening and into early Sunday morning.
However, there is low confidence for LIFR ceilings and/or fog to
develop. Low ceilings will lift toward the end of the TAF period.

&&

.MARINE...
(Today through Thursday)
Issued at 1050 AM PDT Sat Jun 7 2025

Buoys are reporting gentle winds across the coastal waters this
morning with moderate sea heights. A westerly breeze will pick-up
this afternoon, enhanced by diurnal effects along the coast and in
the Bays. A low amplitude, long period southwesterly swell
arrives Monday and will causing waves to break in deeper water.
Significant wave heights will remain moderate until a strong NW
breeze and rough seas arrive mid-week.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this
     evening for SF Bay N of Bay Bridge.

     Small Craft Advisory from 3 PM to 9 PM PDT Sunday for SF Bay N
     of Bay Bridge.

     Small Craft Advisory from 3 PM Sunday to 3 AM PDT Monday for Pt
     Pinos to Pt Piedras Blancas 0-10 nm.

&&

$$

SHORT TERM...DialH
LONG TERM....DialH
AVIATION...RGass
MARINE...Flynn

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