Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA
FXUS66 KMTR 232148
Area Forecast Discussion
National Weather Service San Francisco Bay Area
248 PM PDT TUE AUG 23 2016
.SYNOPSIS...A slight warming trend will continue through Wednesday
as high pressure builds off of the California coast. Temperatures
will be near seasonal averages. Widespread night and morning low
clouds expected once again tonight however the marine layer is
expected to compress slightly resulting in a quicker burnoff
Wednesday. Cooler conditions expected late in the week as an upper
level trough moves across the region.
.DISCUSSION...as of 2:45 PM PDT Tuesday...Temperatures are
running a few degrees warmer at this hour than 24 hours ago as
high pressure continues to build off the coast. Latest obs show
the pressure over the area has increased 4 to 5 mb since yesterday
resulting in afternoon highs pushing into the 60s to near 70
along the coast to the 70s around the bay and the 80s inland. 90s
in the warmest southern interior valleys. The marine layer has
compressed a bit to around 1300 feet at this hour but is expected
to deepen slightly to around 1500 feet as the stratus moves in
Temperatures are anticipated to warm a few degrees Wednesday as
the high off the coast continues to build and shifts a bit to the
east and closer to coast. 500 mb heights will peak around 590 DM
this afternoon and persist through Wednesday. Highs are
anticipated to warm into the mid 60s to mid 70s along the coast
to the upper 70s to upper 80s inland. Warmest inland valleys will
warm into the mid to upper 90s. Further compression of the marine
layer is forecast Wednesday as the high shifts toward the coast.
This will resulting in less stratus coverage and a quicker burnoff
Models remain consistent in rotating a shortwave through the area
on Thursday resulting in a gradual cooling trend as cooler air is
introduced into the region. The trough will also deepen the marine
layer which will lead to a later burnoff of the low clouds.
Anticipate cooler than normal temperatures and a deep marine layer
through the weekend and into early next week as yet another
shortwave swings across the region Sunday into Monday.
No rain expected through the forecast period.
.AVIATION...As of 10:35 AM PDT Tuesday...For 18Z TAFs. Marine
layer is still currently around 1800-2000 feet this morning with
most terminals at VFR right now. All terminals should be at VFR
by 18Z. Expect another round of moderate onshore winds this
afternoon. CIGs return tonight. Marine layer is expected to be
more compressed tonight and tomorrow. Therefore...earlier
clearing times anticipated.
Vicinity of KSFO...VFR continues through this afternoon. Moderate
seabreeze winds today with gusts 15-20kt. Low CIGs return around
06Z for KOAK and around 10Z for KSFO.
SFO Bridge Approach...Similar to KSFO.
Monterey Bay Terminals...VFR for the rest of the afternoon.
Moderate onshore winds between 10-15kt. Low CIGs return early
this evening...around 02Z.
.MARINE...as of 2:35 PM PDT Tuesday...High pressure will remain
well west of the state resulting in light northwest winds through
the week. A short period northwest swell will continue to mix
with a longer period southerly swell through much of the forecast
.Tngt...SCA...SF Bay until 9 PM
PUBLIC FORECAST: CW
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