Area Forecast Discussion
Issued by NWS Reno, NV

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FXUS65 KREV 211006

Area Forecast Discussion
National Weather Service Reno NV
306 AM PDT Thu Sep 21 2017


Generally isolated to scattered showers are expected across the
region with snow levels falling to around sixty-five feet by
late morning today. Expect periods of winter driving conditions in
the higher Sierra today. Temperatures will remain below normal
through the weekend and may drop below freezing in some lower
elevation valleys starting Friday night. Next week is likely to be
dry with a slow warming trend.



Showers have developed along a frontal zone draped across western
Nevada and the eastern Sierra from around Markleeville/Bridgeport
to Fallon/Elko. This boundary has largely stalled while the low
pivots about its axis. As such, precipitation totals in this band
will likely be higher than surrounding locations. Fallon has
received a little over 0.1 inches through 0900Z with potential
for another tenth of an inch through the early morning hours. The
heaviest precipitation remains in eastern Nevada where over 0.6
inches has fallen with more accumulation expected. This band will
slowly shift farther southeast through the morning.

An upper low circulation settles over western Nevada by late
morning bringing instability and showers through the evening into
early Friday. Precipitation chances were increased over the Tahoe
Basin and along Interstate 80 from Donner Summit to the Nevada
state line; showers may become more numerous through the afternoon
hours today. With snow levels dropping to 6500 feet, anticipate
periods of winter driving conditions along I-80, around the higher
roads in the Tahoe Basin, and over Mount Rose Highway with some
light accumulations mainly 7000 feet and above. Generally, a
dusting to an inch will occur around 7000 feet with the potential
of a few inches above 8000 feet. While this is not a significant
storm, travelers should be aware and plan accordingly. Hikers and
campers need to be especially aware since they will be most
vulnerable to much colder and wetter conditions.

Elsewhere, expect isolated to scattered showers. While snow levels
are mainly above 6500 feet, instability will be sufficient to
allow for snow pellets to reach valley floors. Some showers will
be heavy enough to create slick driving conditions. Otherwise,
rain will generally be less than 0.1 inches. The exception will be
east of Fallon where the precipitation axis is slowly pivoting;
locations could receive around 0.25-0.4 inches.

After a cold morning, low pressure slowly exits the region
Friday; isolated showers were added along the Sierra since
instability is slower to exit. Friday morning will likely be the
first SOLID FROST/FREEZE EPISODE for lower elevations with
potential impacts to irrigation systems and vegetation.

Conditions become much drier by Saturday as high pressure builds
into the region. Expect dry conditions and a gradual warming trend
through the weekend and next week. Boyd



Rain and high elevation snow will be the most prominent weather
for aviation interests. Expect periods of MVFR for Sierra
terminals especially this afternoon. Mountain obscurations will be
present for all western Nevada and Sierra terminals. Otherwise,
CIGS/VIS should remain VFR for western Nevada terminals. Boyd


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