Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Sacramento California
326 PM PST Tue Jan 27 2015
weak storm system will exit norcal tonight with skies turning
partly cloudy. Another weak system will bring slight shower
chances near the Sierra crest Thursday...mostly cloudy elsewhere.
weak system exiting into Nevada late this afternoon. Not much
precip for valleys with generally trace amounts...a few hundreths
fell over the foothills and up to 0.30 over the Sierra. Precip
seems to have mostly shifted east into Nevada. Have removed all
valley precip chances will keep 30 pct or lower chances for the
Sierra south of Highway 50. Dry conditions tomorrow...but will
have plenty of high and mid-clouds.
Another weak system will move through the area from the southwest
on Thursday. Current models are not indicating any precip with
this system valleys...only increased cloud cover. The mountains
may see amounts lass than 0.10 inches mainly near the Sierra
crest. System will track east into the Great Basin Friday with
high pressure building back over the area. High temperatures will
be upper 50's to upper 60's through the period...warmest north SAC
Extended discussion (saturday through tuesday)
High pressure builds into northern California from the eastern
Pacific on Saturday. This will bring dry weather on Saturday.
North to east winds are expected Friday into Saturday as surface
high pressure builds into the Pacific northwest and into Nevada.
Breezy and gusty north to east winds are expected to weaken on
Saturday afternoon as the surface high shifts to the East.
Ridge flattens Sunday into Tuesday with the potential for some
disturbances moving through. The timing and track of these varies
with the models but they could bring a threat of precipitation.
Currently have a slight chance of showers...mainly over the
mountains north of I-80 late Sunday into Monday. Precipitation threat
spreads farther south Monday night into Tuesday. Precipitation
amounts are expected to be light.
VFR conditions at all taf sites this afternoon into evening.
Expect MVFR visibility returning after 06z in br...with local fog
developing over the northern san Joquin valley after 12z causing
periods of IFR. Isolated showers might continue over the Sierra
through tonight with local IFR conditions. Light and variable
winds continue. Ek/jbb