Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 200002
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
402 PM PST Thu Jan 19 2017


.Synopsis...
A series of winter storms will move through NorCal through
Monday. Mountain travel impacts are likely due to snow and winds.
Moderate to heavy rain at the lower elevations with windy
conditions.

&&

.Discussion...
Showers and isolated thunderstorms will continue through the
evening...with a few heavier bursts of snow over the mountains.
Snow levels have dropped as low as as 3000 feet...but should
generally remain between 3500-4000 feet. South to southeast winds
will again increase around midnight under 45-55 kt 925 jet max.
This will translate to 30-35 mph winds with a few gusts to 50 mph
over the Sacramento valley Redding to Modesto into mid-day Friday.
These type of winds will likely down trees and power
lines...especially those weakened by yesterday`s strong winds.
Power outages will be possible late tonight and Friday morning.

Snow showers will continue over the Sierra this evening with a few
more inches...much heavier band will move in begining around 4 am
continuing into Friday with 1 to 3 feet possible above 4000 feet
through Saturday morning. Snow levels may dip to 3000 feet at
times in the heavier precip bands. Valley rainfall of 0.50 to 1
inch are forecast. Have added isolated thunderstorms to the Friday
afternoon forecast as enough clearing may open up for
destabilization over valley locations.

The next storm system will swing through NorCal Saturday night
into Sunday with valley rainfall of 1 to 2 inches and mountain
snow of 1 to 2 feet and snow levels 3000-4000 feet. Another round
of gusty winds with speeds to 50 mph will also be possible.

&&

.EXTENDED DISCUSSION (Monday THROUGH Thursday)

Transition to amplified upper air pattern forecast for next week
expected to give a break in precipitation to the region beginning
Tuesday. Until then, lingering upper trough will continue showers
across the region on Monday with accumulating snowfall likely
across the foothills and higher terrain.
&&

.AVIATION...

Deteriorating conditions by 06Z Friday as the next storm
approaches. Southerly winds 10-20 kts today, increasing to 15-25
kts with gusts 30-40 kts after 06Z Friday.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Winter Storm Warning until 10 AM PST Saturday for West Slope
Northern Sierra Nevada-Western Plumas County/Lassen Park.

Winter Weather Advisory until 4 PM PST Friday for Mountains
Southwestern Shasta County to Northern Lake County-Shasta Lake
Area / Northern Shasta County.

Wind Advisory from 1 AM to 1 PM PST Friday for Carquinez Strait
and Delta-Central Sacramento Valley-Motherlode-Northeast
Foothills/Sacramento Valley-Northern Sacramento Valley-Northern
San Joaquin Valley-Southern Sacramento Valley.

&&

$$



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