Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA
FXUS66 KMTR 291144
Area Forecast Discussion
National Weather Service San Francisco Bay Area
444 AM PDT Sat Apr 29 2017
.SYNOPSIS...Seasonably warm weekend in store for the Bay Area and
Central Coast. Another round of offshore winds Monday and Tuesday
will drive temperatures even warmer early next week with daytime
highs into the 80s with some lower 90s for the warmest interior
valleys. Cooling trend back to normal by Thursday and Friday as
the next trough arrives.
.DISCUSSION...as of 3:09 AM PDT Saturday...Skies are clear early
this morning with a still strong 6.5 mb northerly gradient down
the coast from Arcata to SFO. Gusty northeast winds are still
showing up across the area hills with gusts currently in the 25-30
mph range. These offshore winds will ease by mid morning as the
radiative inversions mix out. This will set the stage for an ideal
Bay Area Saturday with highs well into the 70s and some lower 80s
away from the coast. Even the beaches will stay sunny with 70s
found just a few miles inland.
Given the dry airmass temperatures will cool into the 40s and
lower 50s tonight with lighter winds aloft allowing for better
Sunday looks like a near repeat of Saturday with sunny and
seasonably warm temperatures in place.
A shortwave diving into the Great Basin late Sunday night into
Monday morning will increase surface pressure gradients once
again. This will initiate another round of offshore winds for the
hills early Monday morning and then again Tuesday morning. 850 mb
temps around 12 celsius this morning will warm to 15-16 celsius by
Monday morning with these offshore winds in place. Thus expect
noted warming early next week with 850 mb temps forecast to reach
17-18 celsius by Weds. These type of temps aloft with light
offshore flow and a thermal trough along the coast should
translate into some of the warmest weather so far this spring with
daytime highs well into the 80s and even some lower 90s for the
warmest inland valleys.
Cooling trend should begin in earnest by Thursday, at least near
the coast with widespread inland cooling back to near or even
below normal by next Friday as the next (mainly dry) trough
arrives along the Northern California coast. In the meantime
after a long and wet winter the next week looks to bring some
ideal spring time weather to not only the Bay Area but much of the
.AVIATION...As of 10:35 PM PDT Friday...For 12z Tafs. VFR.
Northerly winds this morning with increasing onshore winds in the
afternoon. Winds will generally be weaker today than yesterday,
peaking in the upper teens. Mostly clear skies today, with some
low stratus clouds possible late tonight.
Vicinity of KSFO...VFR. North winds will become westerly by the
afternoon/evening, ranging 10-20kt through the afternoon/evening.
Some low clouds possible late tonight.
SFO Bridge Approach...Similar to KSFO.
Monterey Bay Terminals...VFR. Light and variable winds, becoming
light to moderate westerly winds on Saturday afternoon.
.MARINE...as of 04:40 AM PDT Saturday...Strong, gusty northwest
winds will persist through the weekend as high pressure remains
offshore. The strongest gusts may occasionally be gale force,
especially later this afternoon and evening. The strong winds
will also drive hazardous seas in the form of steep fresh swell
with short periods.
.Tday...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 Arena to Pt Reyes 0-10 nm from 9 AM
SCA...Pt Reyes to Pigeon Pt 0-10 nm from 3 PM
SCA...Mry Bay from 3 PM
PUBLIC FORECAST: RWW
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