Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 111118
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
318 AM PST Mon Dec 11 2017

.Synopsis...
Dry weather into next weekend with mild days and chilly nights.

&&

.Discussion...
Clear skies across interior NorCal except for some high clouds
south of I-80 associated with the closed low near Baja California.
Current temperatures are similar to readings from 24 hours ago and
range from the teens in the mountain valleys, upper 20s to upper
30s in the Central Valley and 40s to lower 50s across the foothill
and west slopes thermal belts.

Upper high shifts slightly east into Tuesday as a short-wave
trough rides the ridge towards BC. Ridge then retrogrades back to
the West Coast Wednesday with dry weather persisting. Little
change in the weather through the week with some morning patchy
fog or frost possible in the Central Valley. Highs will continue
to be above average with record highs possible across portions of
the northern Sacramento Valley.

&&

.EXTENDED DISCUSSION (Friday THROUGH Monday)
Upper trough moving through the Pacific Northwest on Friday will
weaken persistant west coast ridge bringing cooling most areas
especially northern CWA. At this time it appears any precipitation
with this system will remain north of the forecast area. Dispite
cooling, daytime highs will remain above normal. Upper ridge
rebuilds briefly on Saturday will little change expected in
daytime highs. Another shortwave trough rides over the ridge on
Sunday. Models differ on strength of this shortwave with GFS
currently a little deeper. Far northern California could see a
little light precipitation but probability remains fairly small.
Otherwise, extended forecast remains dry with above normal daytime
highs and relatively light winds.

&&

.AVIATION...
VFR conditions over Interior NorCal next 24 hours except for MVFR/
IFR vsbys possible in BR/FG over the Central Valley through 20Z
and again after 06Z tonight. Surface winds generally below 10 kts.

&&

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

&&

$$



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