Area Forecast Discussion
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FXUS66 KSTO 222107

Area Forecast Discussion
National Weather Service Sacramento CA
207 PM PDT Tue Sep 22 2020

Chance of showers over the Shasta and Coastal mountains Wednesday
night and Thursday, otherwise dry weather expected. Temperatures
close to average this week, then hot, dry, and potentially windy
conditions return over the weekend with possible critical fire
weather conditions.


Visible satellite imagery shows a band of high clouds beginning to
enter far northwestern California this afternoon in advance of a
system that will impact the Pacific Northwest later this week.
Highs this afternoon will be in the middle 80s to around 90 deg F
for the Sacramento and northern San Joaquin Valleys, or within a
few degrees of where we should be for the first day of
astronomical autumn. Smoke and haze from the region`s wildfires
will continue to impact some communities again today.

Onshore flow will persist with an evening and overnight Delta
breeze bringing occasional gusts to around 30 mph in/around the
Delta. This will also promote sufficient cooling with comfortable
overnight temperatures for many communities for the next few

Rain shower chances on Thursday will be largely limited to far
northwest California. The National Blend of Models has trimmed
back precipitation chances a bit for the far northern Sacramento
Valley to less than 10 percent. Sacramento is expected to remain

Temperatures begin to warm this weekend and into next week, along
with increasing chances of critical fire weather conditions.
Please refer to the extended section of the discussion for more
details. // Rowe


High pressure builds over interior Northern California over the
weekend into early next week. This will result in a warming trend
with above normal temperatures. Highs by Monday/Tuesday in the
Central Valley will be in the upper 90s to around 102. Moderate
heat risk is possible in the Valley and surrounding foothills.
This heat could impact sensitive groups. Breezy north to east wind
develops Saturday and continues into early Tuesday. Combination
of wind, hot temperatures and low humidity will bring elevated
fire weather conditions. A Fire Weather Watch is in effect from
Saturday morning through Monday morning including the west side of
the Sacramento Valley, the Coastal Range, the Sierra Nevada
foothills and the Delta. Please practice fire safety.


VFR conditions over interior NorCal next 24 hrs except local MVFR
conditions in HZ/FU vicinity of wildfires. Surface wind generally
below 12 kts, except for local gusts up to 20-30 kts vicinity
Delta. Southwest wind gusts up to 20-30 kts over higher terrain
thru 03Z Tuesday, then increasing again after 18z Tuesday.


Fire Weather Watch from Saturday morning through Monday morning
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-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 San Joaquin Valley in San Joaquin and Stanislaus
Counties 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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