Scientific Forecaster Discussion
Area forecast discussion
National Weather Service San Francisco Bay area
213 am PDT Tuesday Sep 2 2014
Synopsis...the area will see a cooling trend beginning
today as a low pressure trough approaches the coast. Dry
conditions will persist through the period.
Discussion...as of 2:13 am PDT Tuesday...with a marine layer
depth of around 1200 feet...the satellite infrared fog product imagery
is showing coastal stratus extending from Point Reyes south...and
pushing into the Salinas valley. Expect cooler temperatures today
across the district as an upper level trough approaches the coast.
This trough is prognosticated to remain over the eastern Pacific
resulting in continued cooling through about middle to late in the
week. Night and morning coastal low clouds are expected as well as
possible drizzle right at the immediate coast during the early
morning hours. High temperatures are expected to remain around or
slightly below normal through the latter part of the week and into
next weekend as onshore flow persists.
Aviation...as of 10:46 PM PDT Monday...mainly clear skies are
expected to persist through late tonight. Patchy low clouds will
return after 12z Tuesday morning over select Bay area terminals
with ceilings over Monterey Bay area terminals within the next hour or
two. Clearing is expected around 17z-18z Tuesday morning.
Vicinity of ksfo...VFR conditions expected through late tonight.
Low clouds will return to the Bay area after 12z Tuesday morning.
West winds around 10 to 15 knots will ease to around 5 knots overnight.
Stratus tonight expected to be patchy and mostly confined to coast
and East Bay.
Ksfo bridge approach...similar to ksfo.
Monterey Bay area terminals...IFR ceilings expected through the night.
Clearing is expected around 17z-18z Tuesday morning. Light winds
Marine...as of 8:33 PM PDT Wednesday...northwest winds will
continue tonight across the outer coastal waters. These winds will
decrease Tuesday as a thermal trough develops along the California
... Arena to pt Reyes 10-60 nm
Small Craft Advisory...pt Reyes to Pigeon pt 10-60 nm
Small Craft Advisory...sf Bay north of the Bay Bridge from 1 PM
Small Craft Advisory...Pigeon pt to pt pinos 10-60 nm until 3 am
Public forecast: Sims
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