Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 252212
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
312 PM PDT SUN SEP 25 2016


.SYNOPSIS...
Dry weather with above normal temperatures through Tuesday.
Cooling trend begins Wednesday. Breezy north winds today will
gradually weaken this evening into Monday.

&&

.DISCUSSION...
A strong ridge of high pressure over the region will persist
through early this week. Temperatures will be warming between 95
to 102 degrees today with the 100 plus temperatures over the north
end of the valley. Very warm temperatures will continue through
Tuesday with highs between 95 and 100 degrees for the valley.

Locally breezy north winds mainly for the west side of the valley
will taper by early evening. The winds in the mountains will
increase once again this evening with local gusts up to 35 mph
persisting into Monday morning.

Temperatures at night should cool off nicely with the exception
of the thermal belt areas which could see lows in the lower 70s.

Wednesday will be a transition day as the ridge starts to break
down and a trough begins to deepen over the west coast. Temperatures
will start to trend cooler.

.EXTENDED DISCUSSION (Thursday THROUGH Sunday)

A series of upper level disturbances will drop into the Pacific
Northwest late this week. This should result in a gradual cooling
trend over interior northern California, with highs about 5 to 10
degrees below normal by the end of this week. Valley highs might
be in the 70s next weekend. Precipitation coverage will be
dependent upon the position and strength of the second energy
impulse, with the ECMWF showing a deeper upper trough than the
GFS model solution. Have kept precipitation chances over the
northern mountains for now due to model differences.

&&

.AVIATION...

VFR conditions over interior NorCal next 24 hours. Generally light
winds, except for occasional gusts up to 25 kts over the northern
Sierra until 10Z Monday.
&&

.STO Watches/Warnings/Advisories...
Red Flag Warning until 6 PM PDT this evening for Central
Sacramento Valley in Glenn, Colusa, Yuba, Northern Sutter, and
Butte County Below 1000 Ft-Eastern Mendocino NF-Eastern Portion
of Shasta/Trinity NF-Lake County Portion of Lake-Napa-Sonoma
Unit-Northern Sacramento Valley to Southern Tehama County Line
Below 1000 Ft-Northern Sierra Foothills from 1000 to 3000 Ft.
Includes portions of Shasta-Trinity and Butte Units-Northern
Sierra Including Lassen NP and Plumas and Lassen NF/S West of
the Sierra Crest (West of Evans Peak-Grizzly Peak-Beckworth
Peak)-Southeast Edge Shasta-Trinity NF and Western Portions of
Tehama-Glenn Unit-Southern Sacramento Valley in Yolo-Sacramento
Far Western Placer, southern Sutter and Solano County Below 1000
Ft.

&&

$$



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