Area Forecast Discussion
Issued by NWS Sacramento, CA

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487
FXUS66 KSTO 232251
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
251 PM PST Thu Nov 23 2017


.SYNOPSIS...
Mild temperatures this week with a weak weather system today.
More widespread rain spreads south Saturday into Sunday followed
by a colder system early next week.

&&
Mostly cloudy across much of the area today, with some light,
scattered precipitation having fallen from around Wheatland
northward. Totals have ranged from a trace to 0.04"(Redding) in
the Valley, to up to 0.17" at Manzanita Lake and Mineral in the
mountains of western Plumas County. Radar is showing a band of
light precipitation currently from Sacramento to over Grass Valley,
though little more than sprinkles is reaching the ground at this
point.

Cloud cover is expected to limit Friday morning Valley fog
development, but some patchy fog over the Stockton and Modesto
area is expected. Elsewhere, some morning mist is possible. Dry
weather is expected on Friday. Valley highs should reach the upper
60s. A weak system will brush the northern mountains on Saturday,
with some light precipitation. More widespread rain is expected
Saturday night into Sunday, with high snow levels. A colder system
arrives Sunday night and continues into Monday. This system is
trending wetter, with accumulating snow looking more and more
likely to impact travel. Snow levels are expected to drop below
pass levels by evening. Travelers should be prepared for winter
driving conditions. EK

&&

.EXTENDED DISCUSSION (Monday THROUGH Thursday)

A cold, wet weather system is still expected to impact NorCal
Sunday into Monday morning. Models are trending wetter, especially
in the early Monday morning hours. Both precipitation and snow
amounts have increased over the Sierra Nevada through early
Monday morning with this system. Rain and snow showers will
linger throughout the day Monday before drying out in the evening.
The valley and ridge tops could see some gusty winds Monday night
as the trough moves east of the area. After this, model
confidence is high in ridging building behind the trough,
bringing dry weather through the end of the extended period.
Valley fog development is possible after the passing of the
trough.

&&

.AVIATION...

VFR conditions through the evening. Light rain showers in the
Central Valley and Sierra through 2z Friday. Continued extensive
mid and high cloudiness expected to dampen fog potential in most
areas. Patchy IFR/LIFR fog still possible after 9z Friday mainly
south of Sacramento. Light winds continue.

&&

&&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$



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