Area Forecast Discussion
Issued by NWS Sacramento, CA

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175
FXUS66 KSTO 242140
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
240 PM PDT FRI JUN 24 2016

.SYNOPSIS...
Dry with near normal high temperatures today then significant
warming over the weekend into the middle of next week. Locally
breezy northerly wind possible late today into Saturday for
increased fire danger, mainly Sacramento Valley.

&&

.DISCUSSION...
Upper low tracking through the Intermountain West as upstream
upper ridging in the EPAC approaches. Increased onshore flow and
synoptic cooling has resulted in temperatures at most locations
running within a few degrees of 24 hours earlier. As a result,
high temperatures this afternoon will top out in upper 80s to
lower 90s in the Central Valley with 70s to low 90s in the
mountains and foothills.

Surface high pressure building through Oregon into the Great
Basin will strengthen the lower level pressure gradient overnight
into Saturday morning. Upper level winds are not in phase with the
low level gradient. Thus expect more localized breezy conditions
overnight into Saturday morning mainly along northern and western
portions of the Central Valley and over the eastern foothills,
Western Plumas, and Sierra Nevada. Winds expected to decrease
Saturday afternoon as pressure gradient relaxes.

Upper ridging from the EPAC builds over Interior NorCal over the
weekend resulting in significant warming. Triple digit heat
expected for portions of the Central Valley Saturday and Sunday
with upper 70s to 90s for the mountains and foothills. High
pressure from the Desert SW expands northwestward over NorCal
early next week, spreading more 100 plus degree heat over portions
of Interior NorCal.

PCH

&&

.EXTENDED DISCUSSION (Tuesday THROUGH Friday)

High pressure over the four corners builds westward into our area,
keeping interior NorCal under a hot weather regime through
midweek. Expect daytime highs to be around 10-15 degrees above
normal. The warmest period looks to be Tuesday-Wednesday, with
widespread triple digits across the valley. Forecast models
suggest a slow cooling trend towards the end of next week, but
that will depend on how fast a trough over the Pacific northwest
weakens the high pressure. Chance of moisture working northward
toward the Yosemite and eastern Sierra crest areas late next
week, with a slight chance of thunderstorms mainly south of Lake
Tahoe.

&&

.AVIATION...

VFR conditions next 24 hours. Winds around 10 kts with occasional gusts of
15-20kts through this evening and again on Saturday.

&&

.STO Watches/Warnings/Advisories...
Red Flag Warning from 11 PM this evening to 6 PM PDT Saturday
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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