Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 212143
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
243 PM PDT Sat Oct 21 2017

.SYNOPSIS...
Warming temperatures through early next week. Breezy north winds
Sunday into Tuesday.

&&

.DISCUSSION...
Warm frontal overrunning of mainly clouds over the far north of
the state today with some showers mainly along the northwest
coast. Clouds will continue to stream over the same general area
overnight and should help to warm some of the lows over the north
end of the valley over last nights lows. Further south skies
should remain mostly clear.

A ridge will gradually build the next couple of days with a
warming trend each day. Surface high pressure will increase over
Oregon and into the Great Basin Sunday into Monday. This will
result in northerly flow in the valley and northeast to east flow
in the Mountains and foothills. The strongest flow will be during
the afternoons in the valley and at night in the mountains and
foothills. Winds dont look all that strong with winds primarily
in the 10 to 15 mph range at its peak with some higher gusts for
the valley. The mountains may locally get a little stronger than
that with sustained winds 20 to 25 mph and local gusts up to 40
mph. By Tuesday the winds will be easing up and becoming lighter.
Temperatures will become the warmest on Tuesday topping out in the
upper 80s to lower 90s for many valley locations.
&&
.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)


Upper level ridging will remain in place across interior NorCal
during the second half of next week. A slider trough will move
southward into the Great Basin late Wednesday into Thursday,
allowing the ridge of pressure to retrograde towards the Eastern
Pacific. This should allow temperatures to cool slightly through
the period with Valley highs in the low 80s. However, daytime
highs are forecast to remain about 5-10 degrees above seasonal
normals. Breezy winds are forecast on Thursday as pressure
gradient tightens.


&&

.AVIATION...


VFR conditions expected across interior NorCal over the next 24
hours as shower chances remain limited to the north. Valley and
ridge winds will increase Sunday afternoon into the evening hours.
&&

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

$$


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