American Canyon, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

292
FXUS66 KMTR 030539
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1039 PM PDT Wed Apr 2 2025

...New AVIATION, MARINE...

.SYNOPSIS...
Issued at 1243 PM PDT Wed Apr 2 2025

Warming and drying trend begins today with temperatures above
seasonal averages by Friday. A weak cold front is possible later
this upcoming weekend.

&&

.SHORT TERM...
(This evening through Thursday)
Issued at 1243 PM PDT Wed Apr 2 2025

Fair weather cumulus clouds are popping off across the region as the
upper level low and surface trough that gave us the last two days of
convective showers continues to move towards the southeast. Today
marks the start of a warming and drying trend that will begin rather
modestly, with high temperatures today reaching the lower to middle
60s in the inland valleys, the middle 50s to near 60 in the coastal
areas, and the 40s to the lower 50s in the higher elevations. Gusty
post-trough winds will develop this afternoon and evening, with
gusts reaching 25 to 30 mph along the coast, through the gaps and
passes, along the ridgelines, and within the northern Salinas
Valley.

Tonight, clear skies and calmer winds will enhance radiational
cooling, with low temperatures expected to be chilly across the
region. A Frost Advisory has been issued for the North Bay valleys
and the interior Central Coast, including the southern Salinas
Valley, from 2 AM to 9 AM Thursday morning. Lows in these areas will
reach the middle to upper 30s, with the coldest spots across the
interior Central Coast reaching the lower 30s. These are borderline
as far as the Frost Advisory criteria, especially in the North Bay,
but the start of the budding season means that agricultural
interests are currently extremely sensitive to low temperatures,
which tipped the scales toward issuing the Frost Advisory.
Elsewhere, lows will range from the upper 30s inland to the middle
to upper 40s along the coast. Three long-term climate sites continue
to see forecasts threatening daily minimum temperature records: San
Rafael, where a forecast of 42 compares to a record of 39 degrees
from 2010; downtown San Francisco, where a forecast of 44 degrees
compares to a record of 41 degrees from 2001; and the Oakland
Museum, where a forecast of 44 degrees compares to a record of 43
degrees from 2003. High temperatures will feel slightly warmer on
Thursday with most regions seeing highs around 3 degrees warmer than
today`s highs, give or take a couple of degrees.

&&

.LONG TERM...
(Thursday night through next Tuesday)
Issued at 1243 PM PDT Wed Apr 2 2025

The warming and drying trend continues through the week as an upper
level ridge builds across the West Coast. This upcoming weekend,
highs should reach the middle 70s to near 80 across the inland
valleys. For context, this is around 5 to 10 degrees above the
seasonal average, and Minor HeatRisk could return to the inland
valleys, meaning that there is a low risk for heat related illnesses
among people extremely sensitive to heat, especially those without
effective cooling and.or adequate hydration.

On Sunday and Monday, a cold front will skirt the Bay Area, bringing
an interruption to the warming trend and a chance for light rain.
Confidence is increasing in the chances for rain in the Bay Area,
especially across the North Bay. However, the rainfall totals are
yet to come into better focus. As before, potential rainfall totals
continue to be modulated by the exact location of the cold front and
how it interacts with a upper level ridge over the western United
States. That said, even the most optimistic forecasts top out around
a half to three quarters of an inch across the Sonoma County
mountains, and every forecast agrees with progressively lower
rainfall totals the farther south you go. Stay tuned to the forecast
as the details evolve.

The warming trend resumes after the cold front moves out, with high
temperatures continuing to climb into the lower to middle 80s by mid-
week.

&&

.AVIATION...
(06Z TAFS)
Issued at 1039 PM PDT Wed Apr 2 2025

Patchy MVFR CIGs along the coastline and Monterey Bay region with
highest confidence in MVFR CIGs continuing to impact HAF and MRY.
NBM is best representing the current satellite setup which shows
cloud cover across the South Bay and interior Monterey County
diminishing, decreasing confidence that CIGs will reach SJC or SNS.
Some potential for fog during the early morning hours at STS and APC
but confidence is low with local WRF guidance suggesting conditions
will be on the drier end. Gusty onshore flow continues at OAK, SFO,
and HAF but has diminished from earlier this afternoon. Winds
continue to diminish overnight before widespread moderate onshore
flow returns during the day tomorrow.

Vicinity of SFO...VFR. Patchy MVFR CIGs are possible overnight but
confidence is low. HREF and NBM guidance keep CIGs more directly
along the coastline which should keep CIGs away from SFO. Gusty
onshore flow will continue to diminish overnight before moderate
west to northwest winds return during the day tomorrow.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Borderline VFR/MVFR conditions at MRY
overnight, VFR at SNS. Low clouds continue in the vicinity of MRY
with BKN CIGs hovering on the BKN030-035 border. Current thinking is
CIGs will hover closer to BKN030 with temporary decreases to between
BKN025-030 possible. CIGs look to remain slightly higher at SNS
where VFR conditions persist through the TAF period. Onshore flow
will continue to diminish overnight with moderate west to northwest
winds expected during the day tomorrow.

&&

.MARINE...
(Tonight through next Tuesday)
Issued at 1039 PM PDT Wed Apr 2 2025

A strong north to northwest breeze and rough seas continue over
the  coastal waters through early Friday morning. Winds will
diminish  heading into the weekend with a moderate to fresh breeze
persisting  into next week. Wave heights will continue to abate
tonight into the  weekend but are expected to build again Sunday
into next week as the  next round of moderate long period swell
reaches the coastal waters.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Frost Advisory from 2 AM to 9 AM PDT Thursday for CAZ506-516>518.

PZ...Small Craft Advisory until 3 AM PDT Thursday for Pigeon Pt to Pt
     Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm-Pt Reyes to
     Pigeon Pt 0-10 nm.

     Small Craft Advisory until 3 AM PDT Friday 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...DialH
LONG TERM....DialH
AVIATION...Kennedy
MARINE...Kennedy

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