Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 221031
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
331 AM PDT Tue Aug 22 2017

.SYNOPSIS...
Showers and thunderstorms possible the next couple of days, then
dry weather returns for the end of the week. Temperatures around
average thru mid-week, then warming for the end of the week.

&&

.DISCUSSION...
Plenty of moisture and elevated instability continues across
NorCal as the upper low remains off the central California coast.
Ripples embedded in the flow around the low continue to spark
showers and thunderstorms - one moved across last evening and
another is moving up from the southeast early this morning.
Temperatures remain quite mild with the cloud cover, in the 50s in
the mountain valleys with generally 60s and lower 70s elsewhere.

Convective activity becomes more extensive today with chances
spreading to the northern mountains and northern Sacramento Valley
by this evening as another wave moves up from the south. Red Flag
Warning has been issued for northern portions of the state for
potential for abundant lightning. Heightened concern for fire
starts with holdover fires later this week as temperatures rise.

Temperatures will be near- average through mid-week as onshore
flow continues. Breezy winds likely through the Delta with cooler
temperatures in that vicinity.

Low moves onshore Thursday, opening up into a trough. Moisture and
instability will decrease, ending chances for thunderstorms.
Temperatures will begin to warm with highs topping out a few
degrees above normal.

&&

.EXTENDED DISCUSSION (Saturday THROUGH Tuesday)
Quiet weather pattern ahead for the long term forecast period
starting Saturday. A stable upper level ridge of high pressure
positioned over the west will provide clear skies and dry weather
in place with above normal temperatures across northern
California. High temperatures can be expected in the 90s/100s for
the valley and foothills with 70s/80s in the mountains.

&&

.AVIATION...
VFR conditions expected the next 24 hours at the TAF sites. High
level scattered to broken clouds are expected for terminals along
and north of Sacramento. Isolated t-storms mainly over the Sierra.
5-10 knot winds except in the Delta where gusts to 30 knots will
be possible.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning from 2 PM this afternoon to midnight PDT
tonight for Burney Basin and Northeast Plateau in Shasta County
Including Northwest Lassen NF north of Lassen NP-Eastern
Mendocino NF-Eastern Portion of Shasta/Trinity NF-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.

&&

$$



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