Area forecast discussion
National Weather Service San Francisco Bay area
1038 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 10:38 PM PDT Thursday...clear skies persist
across the region. Patchy low clouds are expected to reform along
the coast late tonight/early Friday morning. Terminals will likely
remain clear through tonight. Winds will continue to diminish
overnight. Moderate and locally gusty winds are anticipated Friday
afternoon. Moderate confidence.
Vicinity of ksfo... winds will continue to ease 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...moderate winds will ease overnight with
VFR conditions expected to prevail.
Monterey Bay area terminals...VFR conditions expected through
tonight. Winds will continue to ease 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
&&
$$
Public forecast: west pi
aviation/marine: CW
Visit US at www.Weather.Gov/sanfrancisco
Follow US on facebook, twitter, and youtube at:
www.Facebook.Com/US.Nationalweatherservice.Sanfranciscobayarea.Gov
www.Twitter.Com/nwsbayarea
www.Youtube.Com/nwsbayarea
