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313
FXUS65 KVEF 052253
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
253 PM PST Thu Dec 5 2019

.SYNOPSIS...Another weather system is progged to impact our region
this weekend with another round of significant Sierra snowfall and
light valley rain. High amplitude ridging sets up going into the
work week that will result in calm and dry conditions for the rest
of the forecast period.
&&

.DISCUSSION...Today through Thursday.
The fog was quick to burn off this morning as yesterday`s weather
system continues to push eastward. Light ridging will set-up over
the Desert Southwest to finish off the work week.

Another weather system will impact the Sierra and Southern Great
Basin this weekend. Updated model runs indicate an increased
tropical moisture trap associated with this system, resulting in
increased snow totals from the previous forecast. From late Friday
night through Sunday afternoon, forecast Sierra snow accumulation
ranges from 1 to 1.5 feet above 7000 ft with greater values at the
crest. Additionally, wind gusts of 50 mph can be expected through
the weekend. As a result, we have issued a Winter Storm Watch for
the Eastern Sierra Slopes and White Mountains in Inyo County from
late Friday through Sunday afternoon above 7000 feet. As the
forecast progresses and confidence increases, an upgrade to either
an advisory or a warning can be expected tonight or tomorrow.
Regarding the rest of southeastern California, southern Nevada and
northwestern Arizona, slight rainfall chances spread eastward
through the day on Saturday before pushing west-to-east out of the
region Sunday. At this time, little-to-no impactful rainfall
accumulations expected.

Rain chances diminish for the start of the work week with the
passage of a weak cold front that will drop temperatures about 5
degrees area-wide. A high-amplitude ridge will set up for the
remainder of the work week, resulting in calm, dry conditions and
temperatures near-average.
&&

.AVIATION...For McCarran...Light diurnal winds expected over the
next 30 hours. VFR conditions are expected through the period with
cigs at or above 20 kft. Another weather system will bring gusty
winds, shower chances and another round of low ceilings over the
weekend.

For the rest of southern Nevada, northwest Arizona and southeast
California...Light winds will continue at each airfield through the
period. Low clouds will stick around through Friday morning
across south-central Nevada and may redevelop again tonight in the
Owens Valley, reducing cigs to 3-5 kft. Another weather system
will bring gusty winds, shower chances and another round of low
ceilings to all TAF sites over the weekend.
&&

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures.
&&

$$

DISCUSSION...Varian
AVIATION...Boothe

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