Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 240412

Area Forecast Discussion
National Weather Service Las Vegas NV
815 PM PST Fri Feb 23 2018

.SYNOPSIS...An area of low pressure will push to the east tonight,
but snow showers will linger this evening across portions of Mohave
County. The next weak system will provide snow showers to Lincoln
County on Saturday evening. Otherwise, below normal temperatures
will continue across the area through the weekend.

.UPDATE...It was an eventful day across Southern Nevada and
Northwest Arizona as a cold and unstable airmass brought scattered
snow shower activity to some lower elevations.  Snow was observed
down to elevations as low as 2500 feet around parts of the Las Vegas
metro area, though no accumulation was observed. Further up near
3500 feet, Red Rock Canyon was dusted with some light snow
accumulations. Also had a few reports of light snow showers near
Kingman, with more sigifnicant accumulations further east along I-
40 and in the Haulapais.

With the loss of daytime heating and the trough responsible for
todays activity pushing east, things are quickly winding down.
Expect mostly clear skies across the region tonight with chilly
temperatures.   The current forecast is in good shape an no updates
are planned this evening.

.AVIATION...For McCarran...A northwest flow is expected overnight
with speeds generally around 10-15 kts. Few-sct clouds expected
Saturday around 8-10k feet with southwest winds around 9 kts in the

For the rest of southern Nevada, northwest Arizona and southeast
California...Conditions will improve overnight with clouds generally
dissipating over most areas. West to northwest winds will remain
overnight with speeds generally between 10-20 kts. Improving
conditions will be seen on Saturday.



.SHORT TERM...Tonight through Sunday Night.

Rain and snow showers continue across southern Nevada and Mohave
County for the remainder of the afternoon. Snow levels have been
down to around 2000 feet, with snow showers being observed across
many locations in the Las Vegas Valley including some accumulations
in the Red Rock Canyon. Snow showers will continue across far
eastern Lincoln County and across Mohave County into the evening
with a couple of inches of snow still possible. The Winter Weather
Advisory will continue through 4PM PST/MST. Gusty northwest winds of
20 to 30 mph will continue into the evening in many locations with a
few higher gusts across western San Bernardino County, central Nye
and Lincoln Counties. A weak upper level system will push south
through Lincoln County and into Utah late Saturday afternoon and
evening, providing a few snow showers. Otherwise the northwest flow
will continue to keep temperatures well below normal across the area
5 to 10 degrees below their normals.

.LONG TERM...Monday through Friday.

Models are fairly consistent early in the period as a cold upper
trough digs off the west coast and eventually forms a cutoff low
over northern California by Monday evening. There is still some
uncertainty to where the low tracks. If it takes a more westerly
track, its possible that we could see more moisture entrain into the
system, but anything east then moisture would be rather limited. In
either case, there should be enough upper dynamics associated with
the low to generate some showers. With the amount of cold air with
this system, snow levels once again could be rather low. The system
later in the week is a bit more complex, however the models are in
slightly better agreement. Instead of dropping another cold low into
southern Nevada the models now keep the low north of the area with
much of the CWA experiencing a glancing blow. Will not make any
significant changes to the extended right now, but we may need to
trim pops late in the week. Temperatures will remain below normal
for much of the week.

.SPOTTER INFORMATION STATEMENT...Spotter activation is not
anticipated through the weekend. Spotters are encouraged to
report any significant weather or impacts according to standard
operating procedures.



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