Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 212111

Area Forecast Discussion
National Weather Service Las Vegas NV
211 PM PDT Mon Aug 21 2017

.SYNOPSIS...Thunderstorm chances will move north to the southern
Great Basin Tuesday, then return to much of the region Wednesday as
weak low pressure moves near. Thunderstorm chances will decrease for
most of the area on Thursday, then high pressure will build in
Friday, with dry and hot weather expected through the weekend.

.DISCUSSION...The band of clouds and precip which was over the Las
Vegas Valley this morning has been slowly rotating northeast, and
stretched from the NNSS across Lake Mead down to east of Wikieup as
of 2 PM. In the clearing area, isolated storms were firing in
southern Inyo and eastern San Bernardino counties. Much of this will
subside around sunset, but the main band will continue to make slow
northeastward progress overnight. Tuesday could be a down day for
much of the area as drier air wraps in around the low parked just
offshore, but then Wednesday could see an uptick as the low drifts
onshore. The low weakens and fills on Thursday, with storm chances
limited to eastern Mohave County, the Clark County mountains, and
perhaps near the Sierra crest. High pressure builds in beginning
Friday, with dry weather expected through the weekend and
temperatures heating back up to five to ten degrees above normal.
There are some hints in the models of moisture possibly returning
Monday, but this is very uncertain.

.AVIATION...For McCarran...Shower activity has orchestrated the
wind regime today. Lingering showers continue to dissipate and track
northward, resulting in clearer skies and light winds favoring a
north/northeast direction. Wind should remain light and veer toward
the east/southeast around 22z-00z. Shower and thunderstorm activity
will be limited through the rest of the afternoon and evening, but
can not rule out a thunderstorm in the mountains capable of
directing a gusty outflow toward the terminal. Overnight, a light
and variable wind will set up favoring a south/southwest direction
with no showers expected. Diurnal winds expected to set up Tuesday,
with a slight chance of thunderstorms mainly over the Spring

For the rest of southern Nevada, northwest Arizona and southeast
California...A band of showers and thunderstorms expected to
continue to move north into south-central Nevada and through
northwest Arizona this evening. Gusty, sudden outflow wind is
possible with nearby showers. Tonight, southeast to southwest winds
are likely through the evening, with the exception of KEED and KIFP
where winds will favor a northwest/northeast direction. After 05z,
winds become light and variable across the region. Chances for
showers and thunderstorms on Tuesday will be limited to the Sierra
and south-central Nevada.

.SPOTTER INFORMATION STATEMENT...Thunderstorm chances will continue
through Wednesday across much of the area. Spotters are encouraged
to report any significant weather or impacts according to standard
operating procedures.



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