Area Forecast Discussion
Issued by NWS Sacramento, CA

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258
FXUS66 KSTO 201031
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
331 AM PDT Thu Jul 20 2017

.SYNOPSIS...
Hot and dry weather continues with locally breezy conditions.
Hotter weather for the weekend.

&&

.DISCUSSION...
Areas of smoke originating from the Detwiler Fire continue to
spread over portions of the Motherlode and Northern Sierra
Nevada, otherwise skies remain clear across interior NorCal.
Current temperatures are pretty similar across most of the region
compared to 24 hours ago with 40s and 50s in the mountain valleys
and upper 50s to around 70 elsewhere.

Little change expected today as dry southwest flow continues
across NorCal. Hotter weather returns beginning Friday and
accelerates over the weekend as the Southwest high extends
westward bringing synoptic warming and suppressing the marine
layer. Highs Saturday and Sunday will likely make it into the
105-110 range across the northern Sacramento Valley with overnight
lows only dropping into the lower 70s - so a heat watch has been
posted for that area.

While it will be hot, enough of a Delta trickle is expected into
the Central Valley to keep temperatures in the Sacramento and
Stockton areas somewhat in check over the weekend.

Enough moisture may move northward late in the weekend for some
isolated late-day thunderstorms over the northern Sierra Nevada.

&&

.EXTENDED DISCUSSION (Monday THROUGH Thursday)
An upper low off the NW California coast Sunday weakens and
gradually drifts inland across northern portions of the state
early next week. There will be a slow cooling trend into midweek.
This system may pull up enough monsoonal moisture to bring a
slight chance of afternoon thunderstorms over the Sierra crest
south of Highway 50 Monday into Wednesday. Most of the more
favorable conditions will remain to the south and east, though. EK

&&

.AVIATION...
Southwest flow aloft with VFR over most of the area. Local MVFR
in smoke is possible north and east of the Detwiler Fire in
Mariposa County. Local gusts to 25 kt through Delta.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Excessive Heat Watch from late Friday night through Sunday
evening for Northeast Foothills/Sacramento Valley-Northern
Sacramento Valley.

&&

$$



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