Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 271748
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
948 AM PST Tue Jan 27 2015

.Synopsis...
A weak storm system will bring light showers to NorCal today. The
best precip chances will be over the high Sierra where 1-2 inches
of snow will fall above 6000 feet.

&&

.Discussion...
Radar is showing showers south and east of a Blue Canyon-
Sacramento-Stockton line. Unfortunately most of this is in the
form of virga and not reaching the surface. The exception is over
the Sierra south of highway 50 where 0.10-0.20 inches has fallen.
Not expecting any measurable precip in the valley north of
Stockton with only sprinkles. Haze will keep vis between 3-6 miles
through the afternoon as dust/smog is trapped in the lower
atmosphere.

.Previous Discussion...
Lots of mid and high clouds across the region early this morning
moving up ahead of a weak low over SoCal. This has resulted in
milder temperatures across NorCal and inhibited fog development.

The weak system will move north today and may bring some light
precipitation to the valley, mainly to the south of Sacramento.
Amounts will be very light and range from a trace to a few
hundredths of an inch. In the northern Sierra, it`s looking like
most precipitation will stay south of Lake Tahoe with a few inches
of snowfall accumulation possible along the crest. Showers will
begin to taper off by this evening as the low lifts northward
through the Great Basin.

Another weaker system will move through the area Wednesday night
into Thursday and is expected to bring more clouds. Any showers
will likely remain well south of Lake Tahoe in the Sierra. High
pressure and northerly surface flow return Friday. High
temperatures will be upper 50s to upper 60s through the period.

&&

.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.

&&

.Aviation...

VFR/MVFR visibility in the Valley with mid level clouds over the
area as low pressure system moves northeast through California.
A few isolated light showers possible in Valley and Coastal range
until 00z. MVFR visibility returning after 06z in BR...with local
fog developing over the northern San Joquin Valley after 12z. Scattered
showers possible over the Sierra with areas of IFR conditions and
snow levels around 6000 ft through 06z. Light and variable winds
expected. EK

&&

.STO Watches/Warnings/Advisories...
None.
&&

$$







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