Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA

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FXUS66 KMTR 271123
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco Bay Area
423 AM PDT Thu Jul 27 2017

.SYNOPSIS...High pressure building into southern and central
california from the desert southwest will promote warming
temperatures across the district, especially inland, today and
through the coming weekend.

&&

.DISCUSSION...as of 3:30 AM PDT Thursday...Under a 2500 foot
marine layer, coastal stratus has filled into the usual inland
valleys per latest satellite imagery. Currently airport surface
observations only reveal fog obscuration at Monterey, although
visibilities have been varying between 3/4 miles and 5 miles over
the past several hours. Expect low clouds to clear to the coast by
mid to late morning. With a continued onshore flow (surface
pressure gradient between SFO and SAC still over 2 mb) look for
coastal areas to remain close to or slightly above seasonal
normals temperature- wise with highs in the upper 60s and 70s,
while inland areas will be warm in the 80s and 90s, with warmest
interior locations pushing 100 degrees.

A high pressure ridge nudging westward into California will
maintain warm-to-hot inland temperatures through the weekend.
Slight relief is indicated by early next week as a baggy upper
trough nears the coast. The long-range (8-14 day) climate outlooks
give the western states a high probability of above-normal
temperatures for the first week or two of August. Latest runs of
medium-range computer models indicate the upper ridge anchored
over the great basin with 594 dm heights edging into central and
northern California. So, the latter part of next week could see
hot temperatures across inland areas.

&&

.AVIATION...as of 04:21 AM PDT Thursday...Marine layer did reform
overnight, but slightly compressed and a little later than 24
hours ago. Do expect clouds to continue to expand with all
terminals impacted except LVK. Burn off mid to late morning. VFR
this afternoon. Clouds return early tonight.

Moderate confidence.

Vicinity of KSFO...Cigs continue to expand through out the entire
Bay. Conf is marginal, but do expect clouds to move into SFO close
to 12Z. Clearing will be 17-18Z given the late forming of the
stratus.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...IFR cigs and patchy fog will prevail
through 18z-19z Thursday morning. Light onshore winds will
prevail. VFR this afternoon.

&&

.MARINE...as of 04:19 AM PDT Thursday...Moderate to locally strong
northwesterly winds will persist across the northern waters
through at least Friday. The gusty winds will produce steep wind
waves and fresh swell. A long period southerly swell is still on
track to arrive across the waters on Friday due to several
tropical disturbances in the Pacific.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .Tday...SCA...Pt Arena to Pigeon Pt 10-60 nm
             SCA...Pt Arena to Pt Reyes 0-10 nm from 3 PM
             SCA...SF Bay from 1 PM

&&

$$

PUBLIC FORECAST: Sims
AVIATION: MM
MARINE: MM


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