Area forecast discussion
National Weather Service San Francisco Bay area
1041 am PDT Sat may 18 2013
Discussion...as of 9:00 am PDT Saturday...mostly clear skies were
present across the region overnight into early this morning...with
the exception of a few patches of low clouds near the Monterey and
sf bays. Temperatures overnight fell into the 40s to low
50s...similar to those observed yesterday morning and near normal
for the middle of may.
Upper level high pressure will begin to build over the region
today...resulting in slightly warmer temperatures today compared
to yesterday. Temperatures this afternoon will climb into the 60s
to low 70s along the coast...to the middle 70s to middle 80s inland.
Moderate northwest winds will also be present across the area this
afternoon into the evening hours...with wind gusts just over 20
miles per hour for many locations.
Otherwise...current forecast looks right on track with a warming
trend through early next week and continued dry conditions.
Previous discussion...as of 3:55 am PDT Saturday...high pressure
building over the eastern Pacific will maintain mostly clear skies
and kick start a warming trend that will persist through the
weekend and into early next week. Temperatures are forecast to
gradually warm to above normal on Sunday then peak on Monday with
highs reaching into the 70s along the coast and 80s to lower 90s
inland. Upper 90s to around 100 expected in the warmest inland
areas.
Warm temperatures...a drier airmass and winds will combine on
Monday to raise fire weather concerns. The situations will
continue to be monitored closely through the weekend.
Cooler weather is in store from Tuesday on as a cut off low moves
in over the Pacific northwest and meanders over the area through
the end of the week. This system will introduce a cooler airmass
to the region which will drive temperatures into the 50s at the
coast and 60s and 70s inland. Temperatures will see the greatest
drop during the second half of the week. Models have backed off on
bringing any precipitation to the district with precipitation staying north of
the County Warning Area.
&&
Aviation...as of 10:40 am PDT Saturday...similar set up as
yesterday...dry air has filtered into the sf Bay area clearing low
ceilings except along the San Mateo coast. Onshore gradient to near 4
mb will make for somewhat gusty winds at the terminals this
afternoon. MVFR ceilings to return somewhat late tonight.
Vicinity of ksfo...VFR today. Gusty west winds to near 30 knots this
afternoon. MVFR ceilings to return after midnight.
Ksfo bridge approach...similar to ksfo.
Monterey Bay area terminals...VFR today. West winds into the
teens. MVFR ceilings return this evening.
&&
Mtr watches/warnings/advisories...
... Bay from noon
Small Craft Advisory...Pigeon pt to pt pinos 0-10 nm from noon
Small Craft Advisory...pt Arena to pt Reyes 0-10 nm
Small Craft Advisory...pt Reyes to Pigeon pt 0-10 nm
Small Craft Advisory...pt Arena to Pigeon pt 10-60 nm
Small Craft Advisory...Pigeon pt to pt Piedras Blancas 10-60 nm
Small Craft Advisory...pt pinos to pt Piedras Blancas 0-10 nm
Small Craft Advisory...sf Bay from 3 PM
&&
$$
Public forecast: Riley/CW
aviation/marine: ac
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