American Canyon, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

236
FXUS66 KMTR 220542
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
942 PM PST Fri Feb 21 2025

...New AVIATION, MARINE...

.SYNOPSIS...
Issued at 1137 AM PST Fri Feb 21 2025

Another dry day across the region. Chance for light rain in the
North Bay late Saturday through Sunday, and again on Monday.
Otherwise, the forecast remains dry with a warming trend through the
next week.

&&

.UPDATE...
Issued at 844 PM PST Fri Feb 21 2025

Dry conditions continued throughout the day today from the high
pressure system bringing us warmer temperatures. Some areas in our
region, specifically inland valleys, reached temperatures of lower
70s while coastal ranges reached temperatures of lower 60s to even
higher 50s.

Tonight we should expect some cooler temperatures due to minimal
sky coverage which will bring the North Bay area, specifically
Napa, some foggy conditions late tonight into the early Saturday
morning. Saturday we should see the fog dissipate with warm and
dry conditions for some continued beautiful weather!

SB

&&

.SHORT TERM...
(This afternoon through Saturday)
Issued at 1137 AM PST Fri Feb 21 2025

Mostly clear skies prevail over the Bay Area and Central Coast, with
a few cirrus clouds in the sky. Today should be a dry and clear day
with high temperatures reaching the upper 60s to the lower 70s
across the inland valleys, the lower to middle 60s along the Pacific
coast and Bayshore, and the upper 50s to the lower 60s in the higher
elevations. Winds will be light with a slight onshore breeze
developing during the afternoon before light offshore and valley
drainage flows resume overnight.

Low temperatures on Saturday morning range from the upper 30s to
lower 40s in the inland valleys, to the middle to upper 40s along
the coasts and in the higher elevations. Saturday will be an equally
dry day with a slight warming across the inland valleys of the South
Bay and Central Coast, where highs will reach the lower to middle
70s, otherwise highs remain similar to today`s.

&&

.LONG TERM...
(Saturday through Thursday)
Issued at 1137 AM PST Fri Feb 21 2025

The long term forecast has not changed appreciably since the last
update. The previous long term discussion follows for reference:

Upper level zonal flow through the weekend and into early next week
due to additional shortwaves moving across the PacNW. This may bring
a few light showers to far northern Sonoma and Napa counties Sunday
into Monday, though if that were to happen rainfall amount generally
appear to be negligible to perhaps a few couple hundredths of an
inch. Otherwise, dry and warmer weather persists. Upper level
ridging builds by midweek. Agree with the previous shift in that
high temperatures will be worth watching out for given the
proximity to the records. For now, kept the NBM forecast in, but
should the trends continue to lean warmer we may need to bump the
forecast up a few degrees.

By late week or next weekend, guidance from ensemble and
deterministic models shows a cut off low developing and tracking
over CA. It`s too early to say where but it could bring a few
showers to the region.

&&

.AVIATION...
(06Z TAFS)
Issued at 942 PM PST Fri Feb 21 2025

VFR continues for all terminals. There is a chance for MVFR/IFR/LIFR
conditions early Saturday morning for KSTS, KHAF and KSJC, but
confidence is low. Some low stratus may develop near SF Bay
terminals overnight with a slight chance that conditions become
MVFR/IFR but models show agreement of VFR through the TAF period.
Otherwise, light winds overnight with light to moderate onshore
winds returning by Saturday afternoon.

Vicinity of SFO...VFR through the TAF period. Onshore winds have
remain breezy a bit longer than expected, but expect winds to
diminish to light overnight and rebuild to breezy by Saturday
afternoon.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR through the TAF period. Winds build to
moderate and turn to a S/SE direction overnight before returning to
W/NW by Saturday morning.

&&

.MARINE...
(Tonight through next Thursday)
Issued at 942 PM PST Fri Feb 21 2025

Seas and winds continue to remain relatively calm with conditions
lasting into the early part of next week. A new, moderate
northwesterly swell enters the waters by Tuesday of the upcoming
week, causing seas to build up to 11-12 feet.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.
&&

$$

SHORT TERM...DialH
LONG TERM....KR
AVIATION...SO
MARINE...SO

Visit us at www.weather.gov/sanfrancisco

Follow us on Facebook, Twitter, and YouTube at:
www.facebook.com/nwsbayarea
www.twitter.com/nwsbayarea
www.youtube.com/nwsbayarea