Scientific Forecaster Discussion
Area forecast discussion
National Weather Service San Francisco Bay area
300 am PDT Friday Aug 29 2014
Synopsis...normal to slightly above normal temperatures and dry
weather will persist through the Holiday weekend.
Discussion...as of 3:00 am PDT Friday...low clouds with patchy
fog across most of our coastal areas plus adjacent valleys this
morning. In addition, satellite loop this morning shows that
former Hurricane Marie continues to become less and less organized
although high clouds are moving out in advance and toward our County Warning Area.
This more moist air will lead to higher humidity readings today
and even a bit of mugginess across our area. Highs should be close
to where we were yesterday, although the layer of clouds could
keep a some areas a few degrees cooler. Highs will still be
generally in the 60s to middle 70s at the coast with middle 70s to upper
Synoptically, a longwave trough will move down from Canada Friday
night into Saturday leading to slightly stronger winds for higher
elevation spots in the north and East Bay plus a little cooling on
Saturday for far inland areas. A dry northwest flow will set up across
our area as the longwave progresses to the east and a ridge tries
to build into the Pacific.
The pattern should hold until the second half of next week. At
that time another longwave trough will stretch from northern
California into the prairie provinces. Slightly cooler air will
once again filter across our region -- especially for inland
Right now, no chance of rain through at least next Thursday.
Aviation...as of 10:37 PM PDT Thursday...coastal low clouds
are pushing into coastal valleys and expected to reach all
terminals overnight. Clearing is anticipated around 17z Friday
morning. West winds will continue to ease overnight becoming light
and locally variable across all terminals.
Vicinity of ksfo...IFR ceilings expected to return after 08z tonight.
Clearing is expected around 17z-18z Friday morning. Light west winds
expected through the night.
Ksfo bridge approach...IFR ceilings affecting the approach after 10z
Friday morning. The approach will scatter out around 18z Friday.
Monterey Bay area terminals...LIFR ceilings expected to persist
through the night. Clearing is expected around 17z Friday morning.
Light and variable winds will continue through the night.
Marine...as of 9:00 PM PDT Thursday...high pressure will build
off the northern California coast on Friday resulting in
increasing northwest winds that will last through the weekend.
Southerly swell from former Hurricane Marie will gradually subside
through the end of the week.
... Arena to pt Reyes 10-60 nm from 9 am
Small Craft Advisory...pt Arena to pt Reyes 0-10 nm from noon
Small Craft Advisory...pt pinos to pt Piedras Blancas 0-10 nm from noon
Small Craft Advisory...pt Reyes to Pigeon pt 10-60 nm from noon
Small Craft Advisory...Pigeon pt to pt pinos 10-60 nm from 7 PM
Small Craft Advisory...pt Reyes to Pigeon pt 0-10 nm from 3 PM
Small Craft Advisory...pt pinos to pt Piedras Blancas 10-60 nm from 3 PM
Public forecast: Bell
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