Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 151137
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
337 AM PST Thu Feb 15 2018

.Synopsis...
Dry and milder weather for the remainder of the week. Breezy north
winds today. Next system brings a chance of showers to the
mountains on Sunday followed by below average temperatures early
next week with a possible widespread freeze.

&&

.Discussion...
Lingering snow showers over the mountains have ended and skies
have mostly cleared out across interior NorCal as the upper trough
has shifted to the southeast. Current temperatures are pretty
similar to 24 hours ago across most of the area and range from the
upper teens and 20s in the mountains to the mid 30s to lower 40s
through much of the Central Valley. The exception is at the north
end, and along the western edge, of the Sacramento Valley where
developing north winds are resulting in 10-15 degrees milder
readings this morning with temperatures in the mid to upper 40s.

Clear skies across the region today under subsidence in the wake
of the trough. Breezy northerly winds will spread through the
Central Valley with gusts of 20-30 mph possible mainly along the
western edge of the Sacramento Valley.

Pressure gradients relax later today, and lighter winds will set
the stage for patchy frost Friday morning in the valley from about
Sacramento southward. Enough north wind is expected north of
Sacramento to limit frost potential for most of the Sacramento
Valley.

Dry and milder weather expected to continue into the weekend. A
few weak waves move over the eastern Pacific ridge Friday and
Saturday bringing some high clouds, but otherwise will have little
effect.

The next more significant upstream system is forecast to
move through the region on Sunday bringing cooler weather and
breezier conditions. Similar to the past several systems,
precipitation is expected to be light and mainly limited to the
mountains.

&&

.EXTENDED DISCUSSION (Monday THROUGH Thursday)
Extended forecast period consists of high amplitude upper ridging
in the EPAC with deep troughing along the West Coast. Troughing
digs into the Great Basin Monday ushering significantly colder air
into Interior NorCal. Unsettled weather expected Monday with
showers possible in the foothills and mountains with snow levels
lowering to around 1500 feet Monday. Clearing skies Monday night
with much colder AMS in place will result in freezing temperatures
Tuesday morning with 20s to low 30s in the Central Valley. Drier
weather expected through midweek with continued cold overnight
lows and daytime highs climbing from below normal Monday to near
normal Thursday.

&&

.AVIATION...
VFR conds ovr Intr NorCal nxt 24 hrs with areas N to E sfc wnd
gsts to 25 kts poss til 03z Fri.

&&

.STO WATCHES/WARNINGS/ADVISORIES...None.

&&

$$



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