Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA
FXUS66 KMTR 222128
Area Forecast Discussion
National Weather Service San Francisco Bay Area
228 PM PDT SUN MAY 22 2016
.SYNOPSIS...Cooler than normal conditions can be expected for much
of the week. In addition, there is a slight chance for showers
tomorrow and Tuesday especially for higher elevation locations.
.DISCUSSION...as of 2:30 PM PDT Sunday...Just looking at
temperatures across our region today would not give you a clue at
the time of year. During many mid-to-late May days, inland spots
are well into the 80s with even 90s not out of the question.
Instead, almost all areas are in the 60s. This is due to the
overall pattern which has a cool nw flow aloft moving across our
CWA due to a system over the Northern Rockies plus an upper level
Models show the general pattern will not change much through the week
with the overall flow forecast to remain from the nw while two
systems rotate through. Moisture will be very limited in our
region, however it will lead to some instability which will kick
off clouds plus even some spotty showers both Monday and Tuesday.
Thunderstorm remain an outside risk as well particularly tomorrow
afternoon as lifted values drop to around zero. Best chance for
that would be over far eastern parts of the CWA. Any rain that
falls should be light with less than 1/10" forecast. Due to the
pattern temperatures will stay mostly in the 60s to lower 70s
which would translate to as much as 10 degrees cooler than normal.
Currently do not see favorable conditions create weather related
hazards of note for the entire week.
.AVIATION...as of 10:52 AM PDT Sunday...Low clouds prevail across
the area as a result of a very moist boundary layer. MVFR cigs
expected across area terminals this morning with clearing
anticipated after noon today. Light onshore flow will prevail with
an afternoon seabreeze increasing winds across KSFO and KOAK to 15
to 20 kt with gusts to 25 kt this afternoon.
Vicinity of KSFO...MVFR cigs will prevail til 19Z-20Z this
morning. Light onshore flow will prevail with an afternoon
seabreeze increasing winds across KSFO and KOAK to 15 to 20 kt
with gusts to 25 kt this afternoon as the onshore gradient from
SFO-SAC increases to approx 3 mb.
SFO Bridge Approach...Similar to KSFO.
Monterey Bay Terminals...VFR conditions will prevail through this
evening. Generally light onshore winds through forecast period.
.MARINE...as of 02:30 PM PDT Sunday...A weakening trough of low
pressure situated over the Western U.S. will maintain light
northwesterly winds and seas across the coastal waters through
early next week. Winds will strengthen by midweek as high pressure
builds over the eastern pacific.
PUBLIC FORECAST: Bell
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