Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA
FXUS66 KMTR 031106
Area Forecast Discussion
National Weather Service San Francisco Bay Area
306 AM PST Sat Dec 3 2016
.SYNOPSIS...Dry weather conditions will persist through the
weekend along with a slight warming trend in daytime temperatures
today. Meanwhile, overnight conditions will remain chilly under
mostly clear skies. A region-wide cool down is forecast for the
first part of next week as a dry cold front pushes through the
region. Rain chances develop later next week.
.DISCUSSION...As of 3:06 AM PST Saturday...A few high clouds are
currently moving across portions of the CWA this morning,
otherwise, satellite imagery is showing clear skies. Current
temperatures are running in the upper 30s to around 50, currently
2 to 10 degrees cooler than yesterday at this time. Dew point
temperatures are mainly in the upper 20s to upper 30s, which are
actually warmer than those from 24 hours ago. Wind speeds are
much less, except for over the coastal waters where gusty
northwest winds are still occurring. High temperatures today
should be slightly warmer than those on Friday with upper 50s to
mid 60s expected.
A dry cold front is forecast to move across Northern California
Sunday night. Since the trajectory of this system is from the
north, there is not expected to be enough moisture to produce rain
as far south as our district. This trough, however, will bring
cooler temperatures to the area beginning on Monday. High
temperatures will be mainly in the 50s, and overnight lows will
be in the 30s and 40s, with the coolest inland areas possibly
dipping down into the upper 20s by Wednesday morning.
The next chance of rain is after midweek when another upper level
trough is progged to approach the area. Medium range models are in
agreement regarding a wetter system impacting the west coast,
although the main focus is forecast to be across the northern part
of the state. However, given this is still almost one week away,
confidence remains low.
.AVIATION...As of 11:19 PM PST Friday...VFR through the period. A
weak and dry cold front located off Oregon will reach the Bay Area
Saturday then slow in forward speed later Saturday and stall early
Sunday over the north Central Coast. This front precedes the next
cold front upstream over the Pacific expected to arrive Sunday
night and Monday. The WRF model output indicates boundary layer
humidity remains dry supporting VFR into Saturday, but N-NE winds
from the South Bay hills/mtns to the Santa Lucia Mountains may
pick up to 15-20 knots Saturday.
Vicinity of KSFO...VFR. Mainly light winds tonight and Saturday.
SFO Bridge Approach...VFR.
Monterey Bay Terminals...VFR with light offshore winds tonight and
Saturday morning. Winds temporarily light onshore Saturday afternoon
prior to becoming light offshore Saturday evening.
.MARINE...as of 2:58 AM PST Saturday...High pressure over the
Eastern Pacific will weaken tonight as a dry frontal system moves
through the area. Northwest winds will temporarily decrease Sunday
night, but will increase again Monday through Wednesday. A long
period swell train will affect the coastal waters through Sunday.
.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
PUBLIC FORECAST: Sims
MARINE: W Pi
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