Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA
FXUS66 KMTR 281734
Area Forecast Discussion
National Weather Service San Francisco Bay Area
1034 AM PDT Fri Apr 28 2017
.SYNOPSIS...Locally breezy this morning coast and hills otherwise
sunny and warmer today. Becoming breezy again tonight in the hills
under offshore flow and clear skies. Winds will ease Saturday
morning giving way to a clear and warm weekend. Another round of
offshore winds possible Monday morning otherwise continued
seasonably warm and dry through Wednesday. Cooling trend may start
.DISCUSSION...as of 9:32 AM PDT Friday...Except for some high
clouds, sunny conditions are occurring across the area this
morning. Current temperature readings are mostly in the 50s with
high temperatures forecast to warm into the 60s to mid 70s. Strong
surface pressure gradient-induced northwest winds will persist
today, strongest near the coast during the afternoon, with 15 to
25 mph possible, with some higher gusts as well. The latest
surface pressure gradient between Arcata and San Francisco is 6.1
mb, and SFO-SBA is 7.6 mb.
The upper level trough will deepen into the Four Corners region as
a surface high sets up over the Great Basin. This will strengthen
offshore flow winds by Saturday morning, mainly across the East
Bay Hills. Winds are expected to remain below advisory criteria,
and should diminish by late morning. Warmer temperatures and
mostly clear skies are also expected over the weekend with highs
in the 70s to mid 80s, warmest on Sunday.
Models show another round of offshore winds early Monday morning
as another wave passes well to our north and surface gradients
increase once again. Monday through Wednesday look clear and warm
with widespread readings in the 70s and 80s with some lower 90s
possible across interior valleys.
Medium range models do indicate the upper ridge weakening by the
end of the week for cooler temperatures by next Thursday and
Friday. However over the weekend and early next week, the early
season heat events can cause heat related issues as we acclimate
to warmer temperatures. So please follow the basic rules of
hydration and monitoring the young/elderly while never leaving
children or pets unattended in vehicles.
.AVIATION...as of 10:30 AM PDT Friday...For 18z Tafs. VFR. Gusty
NW winds this afternoon and early evening, but should subside
between 03-05z. Passing FEW-SCT high clouds through the day, with
possible FEW low clouds tonight for the Monterey Bay terminals.
Forecast confidence: High
Vicinity of KSFO...VFR. W-NW winds increase and becoming gusty by
18-19z, though not anticipated to be as strong as yesterday.
However, gusts may still reach 25-30 kt this afternoon, possibly
higher gusts at SFO.
SFO Bridge Approach...VFR.
Monterey Bay Terminals...VFR. Breezy, onshore winds gusting to
20-25 kt this afternoon. FEW lower level clouds this evening are
possible, but should not restrict visuals of runways.
.MARINE...as of 8:17 AM PDT Friday...No updates from previous
marine synopsis. Strong northwest winds will continue today and
into the weekend as high pressure looms off the coast. Occasional
gale force gusts are possible across the coastal waters. Steep
fresh seas with relatively short periods will develop in response
to the winds bringing hazardous conditions.
.Tday...SCA...Pt Arena to Pt Reyes 0-10 nm
SCA...Pigeon Pt to Pt Pinos 0-10 nm
SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm
SCA...Pt Arena to Pigeon Pt 10-60 nm
SCA...Pigeon Pt to Pt Piedras Blancas 10-60 nm
SCA...Pt Reyes to Pigeon Pt 0-10 nm
PUBLIC FORECAST: Sims
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