Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA
FXUS66 KMTR 310539
Area Forecast Discussion
National Weather Service San Francisco Bay Area
1039 PM PDT TUE AUG 30 2016
.SYNOPSIS...A broad upper level trough over the West Coast
will remain in place through late week and result in dry weather
conditions along with temperatures below seasonal averages.
.DISCUSSION...as of 8:50 PM PDT Tuesday...Clear skies prevailed
across the region today as an upper level trough approached from
the west. This system mixed out the marine layer earlier today
which allowed temperatures to warm a few degrees across most
locations. Highs topped out in the 60 to around 70 near the coast
to the 80s over inland areas. The warmest inland locations hit the
lower to mid 90s. Along with slightly warmer temperatures winds
also increased across the region. Breezy afternoon conditions were
observed across the district with San Francisco International
Airport reporting sustained winds of 35 mph with gusts to 40 mph
earlier this evening.
For tonight anticipate breezy conditions to continue as well as
increasing high clouds as a swath of cloud associated with a weak
disturbance spinning off the coast moves in from the west. We do
not expect the typical low clouds and patchy fog to redevelop
tonight as the boundary layer remains mostly mixed out.
Little change is expected in the overall weather pattern through
the end of the week as a broad upper level trough remains
anchored over the western U.S. Temperatures will remain near to
slightly below normal through the end of the week and into the
weekend. A slight warming trend is on tap for the end of the
weekend into early next week as a thermal trough develops along
the coast. The marine layer will reestablish itself at some point
this weekend however confidence is low with respect to the exact
Forecast remains on track. No updates are expected this evening.
.AVIATION...as of 10:39 PM PDT Tuesday...Upper trough will pass
over the area tonight and early Wednesday morning, mid and high
clouds continue to stream over the area with a sharp moisture
gradient to dry air seen behind the trough on water vapor imagery.
On KMUX radar a small area of high based echoes between 14 thousand
and 20 thousand feet approx 60 miles SW of the Monterey Peninsula
was seen earlier this evening, also a brief shower with reflectivities
down to about 6,000 feet agl was seen off the San Mateo coast.
VCSH in the 06z terminals KSJC-KLVK southward to the Central Coast
late tonight and early Wednesday morning. Sufficient mixing of
drier air in the lower levels expected to keep VFR going tonight
and Wednesday as well.
Vicinity of KSFO...VFR. West winds gusting to 20-25 knots most of
tonight, possibly a relative lull Wednesday morning then gusty
west winds resuming Wednesday afternoon and evening.
SFO Bridge Approach...Similar to KSFO.
Monterey Bay Terminals...VFR. VCSH through early Wednesday
morning. W-SW winds 5-10 knots possibly becoming locally gusty
.MARINE...as of 8:21 PM PDT Tuesday...An upper level trough over
the eastern Pacific will move over the forecast area tonight
causing gusty winds to continue into Wednesday morning. Surface
high pressure over the eastern Pacific will then temporarily
strengthen Wednesday keeping gusty winds going through Wednesday
afternoon and early evening. Borderline gale conditions are
expected south of Point Sur into the evening hours. Winds will be
moderate through the rest of the week.
.Tngt...SCA...Pt Arena to Pt Reyes 0-10 nm
SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm
SCA...Pt Arena to Pigeon Pt 10-60 nm
SCA...Pt Reyes to Pigeon Pt 0-10 nm until 4 AM
PUBLIC FORECAST: CW
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