Area Forecast Discussion
Issued by NWS Sacramento, CA

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000
FXUS66 KSTO 251031
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
331 AM PDT Mon Sep 25 2017


.SYNOPSIS...
Warmer through mid week with dry conditions continuing. Breezy
north winds next few days for increased fire danger. Remaining
warmer than normal through the end of the week with lighter winds.

&&

.DISCUSSION...
A strong upper level ridge of high pressure will bring continued
fair skies and above normal temperatures through the short term
period. The overall airmass is forecast to warm a few to several
degrees today, Tuesday and a bit more Wednesday as the ridge
amplifies and shifts inland. Combination of northerly flow aloft
and northerly surface gradient will bring breezy north winds today
especially over the northern portion of the CWA. As surface high
pressure pushes into the Great Basin on Tuesday the easterly
surface gradient tightens over the Sierra bringing increasing
winds there. Winds and low daytime RH as well as poor overnight
humidity recovery will bring increased fire danger through Tuesday
night. Lighter winds are in store Wednesday as the upper ridge
axis centers over the west coast and surface gradients relax.
Little change in forecast expected for Thursday as upper level
pattern remains mainly unchanged.

&&
.EXTENDED DISCUSSION (Friday THROUGH Monday)

Eastern Pacific ridging will remain over the area with dry and
warm weather continuing through the week. Daytime highs will
remain above normal with low 90s across the Valley, Delta and
into the lower foothills. By Friday, the ridge will slowly be
displaced as a trough moves into the Pacific Northwest and this
may bring slight cooling. The upper ridge will briefly rebuild
and strengthen on Sunday, with Valley highs increasing into the
mid 90s. Another Pacific trough is expected to bring a slight cool
down early next week. EK
&&

.AVIATION...

VFR conditions expected for Valley TAF sites for the next 24
hours. Northerly gusts up to 20kts possible in the Sacramento
Valley today 18-02z. EK

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning until 5 AM PDT Tuesday for Carquinez Strait and
Delta-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 Motherlode From 1000 to 3000 Ft.
Includes portions of Nevada-Yuba-Placer-Amador and ElDorado
Units-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)-Northern Sierra Including the Tahoe and ElDorado NF/S West
of the Sierra Crest-Southeast Edge Shasta-Trinity NF and Western
Portions of Tehama-Glenn Unit-Southern Motherlode From 1000 to
3000 Ft. Includes portions of Calaveras-Tuolumne Unit-Southern
Sacramento Valley in Yolo-Sacramento Far Western Placer,
southern Sutter and Solano County Below 1000 Ft-Stanislaus NF
West of the Sierra Crest.

&&

$$


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