Area Forecast Discussion
Issued by NWS Reno, NV

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FXUS65 KREV 112159

Area Forecast Discussion
National Weather Service Reno NV
159 PM PST Thu Jan 11 2018


Dry conditions and above average temperatures are expected Friday
through the weekend as high pressure builds into northeast
California and western Nevada. More active weather is expected
next week, especially by late week, as the stronger of two systems
moves through the region.



Low pressure moving into the Pacific Northwest has brought an
increase in thermal/pressure gradients, with gusty winds
(generally 20-35 mph) across northeast California and western/
northwestern Nevada this afternoon. There was a brief period of
light valley rain and higher elevation snow in the past couple
hours (possible warm air advection) in the northern Sierra and
into northeast California; however, it has ceased precipitating
with only trace to a few hundredths recorded.

High pressure builds in tonight and persists through the weekend.
With no substantial cold airmass this side of the Rockies,
afternoon temperatures will be relatively mild (around 10 degrees
above average) through the weekend despite inversions/reduced
mixing after today. Winds will decrease tonight and Friday for most
areas as a surface high builds into the region. The exception
will be gusty easterly winds for the immediate Sierra crest Friday
night and Saturday morning as the high settles into the Great
Basin. -Snyder


Pattern continues to look active for next week with potential for
two Atmospheric River landfalls between Jan 16th and Jan 20th. At
this time the systems moving through the region are not overly
strong and with the recent dry and warm weather most of the
impacts will be beneficial. Negative impacts for this potential
series of storms are rain/snow/wind on travel.

First system should arrive early on Tuesday with snow levels
running in the 6000-8000 foot range. Certainly potential for some
snow accumulations over the northern Sierra passes. Gusty winds
and brief period of rain and high elevation snow are possible for
western Nevada and Mono County.

The more impressive but fast moving system is forecast to pass
through the area Thursday and Friday. Snow levels could fall below
5000 feet and produce a light snow accumulation, but still
impactful to travel, on valley floors. Above 6000 feet, several
inches of snow are possible with a potential for a foot or more
above 7000 feet in the Sierra if the storm pans out. Brong



Low pressure moving into the Pacific Northwest is bringing
sustained southwest to west winds of 35-55 kts at around 10 kft
MSL and over the higher ridges of eastern CA and western NV. This
is likely to keep light-moderate turbulence going over and downwind
of the Sierra through much of tonight. For valleys, peak gust
speeds will be mainly in the 20-30 kt range into evening before

CIG/VIS-wise, areas of higher terrain obscuration in the Sierra
this afternoon should dissipate overnight as drier air works into
the region. The weekend will be dry with widespread VFR conditions
as a ridge of high pressure builds into the region, although
morning fog in a few Sierra valleys remains a possibility. -Snyder


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