Area Forecast Discussion
Issued by NWS Reno, NV

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FXUS65 KREV 211026
AFDREV

Area Forecast Discussion
National Weather Service Reno NV
226 AM PST Tue Jan 21 2020

.SYNOPSIS...

A weak storm system will bring gusty winds and with light snow
for the Sierra and northeast California today. Mainly dry
conditions with light winds and slowly warming temperatures are
then expected from Wednesday through Friday. By next weekend,
another storm system may bring a chance of valley rain and
mountain snow with increasing winds.

&&

.SHORT TERM...

Today will see the arrival of a weaker winter system that will
provide a few inches of snowfall across northern Sierra passes
along with gusty winds.

No significant changes with the forecast and still looking for
initial snow showers to reach western Lassen County around 4-6am,
then the Tahoe Basin after about 10am. Snow levels during the
majority of storm through this evening are likely to range from
5000-5500 feet in northeast CA and 5500-6000 feet around Tahoe and
Alpine/Mono counties.

Snowfall totals around 2-5" still anticipated for ridgetops and
passes of northeast CA (Cedar Pass, Bogard, Fredonyer) southward
to Donner and Echo summits. Amounts generally an inch or less for
Surprise Valley, Tahoe Basin, Carson Range, and western Mono
County. Aside from far northern Washoe County, most of western
Nevada will largely be rain shadowed today.

Winds will be the main impact for western Nevada. Although not a
strong wind event for most areas, there is a set-up for downslope
wind potential favoring eastern Plumas and Lassen Counties. As
such, have issued a Wind Advisory for these locations today where
gusts of 45 mph are expected and up to 55 mph possible for wind
prone locations (US-395 corridor from Susanville to the Nevada
stateline). Hazardous crosswinds are possible this afternoon for
semi-trucks and other high profile vehicles along this stretch.

Downslope potential may also materialize in other wind prone
areas such as I-580 from Galena to Washoe Valley with gusts around
50 mph possible for a short duration this afternoon. Otherwise
gusts of 30-45 mph for the remainder of the Reno-Tahoe region,
with a Lake Wind Advisory in effect for Lake Tahoe with dangerous
boating conditions expected. Gusts of 25-35 mph possible for
Pershing, Churchill, Mineral, Lyon, and Mono counties.

Most showers and gusty winds will taper off by early Wednesday
morning with a few isolated showers remaining across the Surprise
Valley and far northern Washoe County through the afternoon.
Another weak disturbance will glance far northern California and
NW Nevada late Thursday into Friday, but won`t bring much in the
way of precipitation, but mainly just abundant clouds. Fuentes


.LONG TERM...Friday through the end of January...

The jet stream remains over the Pacific Northwest through the end
of the week with abundant clouds and few light showers reaching
the northern Sierra and northeast California on Friday. With weak
ridging over our area, temperatures will creep into the mid 50s
across western Nevada with upper 40s in the Sierra valleys through
Saturday.

By late Saturday into Sunday, a stronger storm system will push
into the region bringing heavier snow into the Sierra as well as
rain to the valleys. Since temperatures will be above normal
through the weekend, snow levels will also be around 6500-7000 ft
initially, then falling to around 5500-6000ft by Sunday night.
Latest projections keep the heaviest snow for elevations above
7000ft in the Sierra, mainly around the Tahoe Basin.

Storm total snow for those higher elevations will most likely be
around the 6-12 inch range, with up to a few inches of snow
actually around the Lake Tahoe level and Truckee. Lesser snow
amounts are expected with this storm down in Mono County, as the
storm system looks to lose much of it`s moisture as it pushes
south. Expect up to 8 inches over the Sierra Crest west of US-395.
As for western Nevada and the lower elevations of northeast
California snow levels will remain above valley floors, so
expecting to see light to moderate rainfall during this time
Sunday.

Anyone with travel plans over the Sierra late Saturday night into
Sunday should be prepared for the potential of winter driving
conditions. Slick road conditions will likely stretch into Monday
morning in the Sierra as well. -Hoon

&&

.AVIATION...

A weak winter weather system arrives today and will provide
increasing winds and light snow showers for KTRK and KTVL.

Areas of mountain wave turbulence is possible along and
downstream of the Sierra with ridge wind gusts near 80kts.
Periods of LLWS possible with gusts of 30-40 knots this afternoon
for Sierra and western Nevada terminals.

IFR to MVFR CIGS/VIS and mountain top obscuration mainly in the
mountains from Tahoe northward. Snow accumulations for Tahoe
terminals will be less than 1 inch with showers tapering off late
evening. Fuentes

&&

.REV Watches/Warnings/Advisories...
NV...Lake Wind Advisory until 10 PM PST this evening for Lake Tahoe
     in NVZ002.

CA...Wind Advisory from 11 AM this morning to 8 PM PST this evening
     for Lake Tahoe in CAZ071.

     Lake Wind Advisory until 10 PM PST this evening for Lake Tahoe
     in CAZ072.

&&

$$

For more information from the National Weather Service visit...
http://weather.gov/reno


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