Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA
FXUS66 KMTR 291017
Area Forecast Discussion
National Weather Service San Francisco Bay Area
317 AM PDT WED JUN 29 2016
.SYNOPSIS...High pressure over the region will result in continued
very warm and dry conditions inland through the work week. Some
cooling is anticipated by the holiday weekend, especially over
inland areas. Dry weather and near seasonal temperatures are
likely for the Forth of July Holiday Weekend.
.DISCUSSION...as of 3:17 AM PDT Wednesday...Satellite imagery
shows low clouds confined mostly to the coast, although stratus
has pushed into the Salinas Valley and locally into the San
Francisco Bay. The northerly surface pressure gradient is still
rather strong with 4.7 mb between ACV and SFO, while the onshore
component has ramped up in the last 24 hours with 3.3 mb now
between SFO and SAC. The stronger onshore flow should result ins
slightly cooler temperatures inland. Coastal areas should be
similar with highs in the 60s to lower 70s. Inland areas will warm
to the 80s and 90s, with the hottest inland areas topping out
around 105 degrees.
Similar conditions are expected to persist through Friday with
warm inland areas and much cooler coastal temperatures. Over the
weekend, an upper level trough approaching the coast will enhance
the onshore flow and bring additional cooling to inland areas. by
Saturday and Sunday, 10 degrees of cooling could be seen across
inland locations with 80s and 90s instead of 90s to 105. A similar
trend is then expected to linger into next week as the state
remains under a weak upper level trough.
.AVIATION...as of 10:45 PM PDT Tuesday...The northerly gradient
has swept much of the stratus from the coast this evening. Low
clouds are anticipated to reform overnight under a 1200 foot
marine layer. The marine layer is anticipated to gradually deepen
overnight as a weak trough moves over the region resulting in more
stratus coverage over area terminals tonight. Moderate onshore
flow will gradually weaken becoming light and locally variable
Vicinity of KSFO...VFR conditions are expected to prevail through
10Z tonight. IFR cigs around 800 feet anticipated overnight.
Cigs are expected to scatter out between 1730Z-1830Z Wednesday
morning. West winds around 15 kt will gradually ease overnight
then increase once again Wednesday morning and afternoon.
SFO Bridge Approach...Similar to KSFO.
Monterey Bay Terminals...LIFR cigs expected to prevail through
tonight. Clearing is expected around 16Z-18Z Wednesday. Light
winds. Moderate confidence.
.MARINE...as of 2:50 AM PDT Wednesday...A strong surface pressure
gradient will maintain gusty northwesterly winds across the
coastal waters through at least Thursday. These winds will support
large, steep seas through late week. A long period southerly swell
will also move into the waters midweek. The surface pressure
gradient is anticipated to weaken Thursday evening bringing
lighter winds to the inner coastal waters for the weekend.
.Tday...SCA...Pt Arena to Pt Reyes 0-10 nm
SCA...Pt Arena to Pigeon Pt 10-60 nm
SCA...Pigeon Pt to Pt Piedras Blancas 10-60 nm
SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm
SCA...Pt Reyes to Pigeon Pt 0-10 nm until 11 AM
SCA...SF Bay from 1 PM
PUBLIC FORECAST: Sims
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