Area Forecast Discussion
Issued by NWS Reno, NV

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000
FXUS65 KREV 182207
AFDREV

Area Forecast Discussion
National Weather Service Reno NV
207 PM PST Sat Nov 18 2017

.SYNOPSIS...

High pressure will bring a dry weekend. Nights will be cold with
near or slightly above average afternoon temperatures. Warm and
weak systems could bring light rain and very high elevation snow
to portions of northern CA and extreme northwest Nevada,
otherwise conditions will be mainly dry.

&&

.DISCUSSION...

A seasonable weekend is on tap with mild afternoons and cold nights.
Inversions will limit mixing during the day and also allow for early
morning patchy freezing fog in some Sierra valleys. Fog in the
Martis Valley may periodically impact I-80 near Truckee from
approximately 3 am through 8 am Sunday morning. High clouds will
begin to increase Sunday ahead of an approaching weather system.

Looking ahead to the start of next week, a passing wave flattens the
ridge on Monday bringing very light precipitation to portions of
northeast California, the Sierra and extreme northern Nevada.
Snow levels will be fairly high, 8000-9000 feet, and liquid totals
have been trending downward, so major travel impacts are
unlikely. This system will bring an increase in wind and improved
mixing, but we are only talking typical breezy conditions.

The trend for the atmospheric river Tuesday into Wednesday has been
farther north with the main moisture plume now directed into the
Pacific Northwest and British Columbia. This is due to the
amplification of the southwest ridge and a deeper downstream trough
over the eastern CONUS. The orientation of the moisture transport is
SSW-NNE, which is not favorable for inland penetration. With these
factors in mind, the majority of the Sierra and Nevada will be clear
of any precipitation impacts with only light rain for northern
California. This will also keep the region mild for much of the week
and through Thanksgiving with high temperatures 10 to possibly even
15 degrees above normal.

For those traveling after Thanksgiving, wet weather may return to
the Sierra and northern Nevada at some point in the Nov 25-28
time frame. The storm intensity and impacts are uncertain at this
time, but be sure to check back if you have travel plans. -Dawn

&&

.AVIATION...

The weekend will feature widespread VFR conditions, outside of
morning FZFG in some Sierra valleys, including KTRK. Winds will be
light through the start of next week. A weak system will bring light
rain and increased cloud cover to portions of northern CA/NV Monday.
-Dawn

&&

.REV Watches/Warnings/Advisories...
NV...None.
CA...None.
&&

$$

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



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