Area forecast discussion
National Weather Service San Francisco Bay area
835 PM PDT Thursday may 23 2013
Discussion...as of 8:30 PM PDT Thursday...the upper level low
continues to spin over the Pacific northwest. The trough axis
passed through the area this morning and the low will start to
lift northeast tonight and Friday. However another upper trough
rotating around the back side of the low will move through inland
on Saturday. Temperatures will warm up a few degrees Friday but
another upper trough will move inland on Saturday preventing any
additional warming.
Cool temperatures are expected to continue into next week as another
upper level low from the Gulf of Alaska sets up over the eastern
Pacific and sends a series of shortwaves into the Pacific
northwest. The first system will arrive on Monday. This system
will dig a little further south and will bring a chance of rain
from the sfo Bay area north and a slight chance of rain south of
the sfo Bay area. A second system will move inland on Wednesday
followed by another system next weekend. The long range GFS hints
at a chance of rain next weekend while the European model (ecmwf) keep US dry after
Monday.
&&
Aviation...as of 5:45 PM PDT Thursday...current satellite imagery
shows mainly clear skies across the region. Low clouds are
expected to reform over the coastal waters overnight with patchy
low clouds expected along the coast late tonight/early Friday
morning. Terminals will likely remain clear with the exception of
kmry and ksns that may see ceilings after midnight tonight. Gusty
winds will continue through the evening then diminish after
sunset. Moderate confidence.
Vicinity of ksfo...moderately strong and gusty west winds will
gradually ease this evening and overnight. Winds are forecast to
strengthen once again Friday afternoon with the onset of the
seabreeze. VFR conditions are anticipated through tonight with
patchy low clouds expected to reform but remain at the coast.
Moderate confidence.
Ksfo bridge approach...VFR...moderate winds will ease overnight
with VFR conditions expected to prevail.
Monterey Bay area terminals...VFR conditions expected through this
evening with ceilings expected to return over kmry and ksns around 09z
and 12z respectively. Clearing anticipated around 17z Friday. Gusty
west winds will ease this evening becoming light and variable.
Overnight. Moderate confidence.
&&
Mtr watches/warnings/advisories...
... Arena to pt Reyes 0-10 nm
Small Craft Advisory...pt Reyes to Pigeon pt 0-10 nm
Small Craft Advisory...Pigeon pt to pt pinos 0-10 nm
Small Craft Advisory...pt pinos to pt Piedras Blancas 0-10 nm
Small Craft Advisory...pt Arena to Pigeon pt 10-60 nm
Small Craft Advisory...Pigeon pt to pt Piedras Blancas 10-60 nm
Small Craft Advisory...sf Bay until 11 PM
Small Craft Advisory...mry Bay until 11 PM
&&
$$
Public forecast: west pi
aviation/marine: CW
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