Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 241021

Area Forecast Discussion
National Weather Service Las Vegas NV
320 AM PDT Wed May 24 2017

.SYNOPSIS...Temperatures will peak well above normal today before a
trough moving down from western Canada produces a modest cooling
trend and ushers in gusty southwest winds. A weak disturbance will
produce isolated thunderstorms this afternoon and evening across the
southern Sierra and southern Great Basin. Dry weather and a warming
trend are expected over the Memorial Day Weekend.

.SHORT TERM...through Friday.

Well above normal temperatures today will be pushed back to near
normal Thursday and Friday as moderate southwest winds return due to
a trough sliding over British Columbia and brushing northern Nevada
later today. This will pull a weak upper low off the California
Coast with limited mid level moisture across the southern Sierra and
central Nevada this afternoon and evening. Sufficient instability
and mid level convergence should exist across those zones to produce
a few showers and isolated thunderstorms before it moves to the east
by Thursday morning. Additional shortwaves dropping down from the
north will reinforce the trough over northern Nevada and produce
breezy to windy conditions across the region Thursday and to a
lesser extent Friday. The most enhanced winds will be focused over
western San Bernardino County but the latest model wind forecasts
have backed off slightly and it looks like gusts will generally be
in the 30 to 40 mph range and any gusts over 40 mph do not appear
widespread enough to warrant a wind advisory for the Western Mojave

.LONG TERM....Saturday through Tuesday.

The weather pattern for the Memorial Day weekend is expected to be
dominated by high pressure before troughing before troughing becomes
more of a player across the southwestern states on Tuesday. A
transition from shortwave troughing on Friday to high pressure on
Sunday will warm temperatures from near seasonal averages Saturday
to several degrees above normal through the rest of the period. Look
for breezy afternoon winds at times with periods of high clouds
passing overhead and afternoon cumulus buildups and possible showers
over the Sierra.

.AVIATION...For McCarran...Winds will increase from the southwest
late this morning through the afternoon with gusts of 25-30 knots
likely from mid afternoon through early evening. Mechanical
turbulence can be expected in the lee of the Spring Mountains this
afternoon through tonight.

For the rest of southern Nevada, northwest Arizona and southeast
California...Increasing southwest winds will develop across the
region from late this morning through the afternoon. Gusts of 25-30
knots and mechanical turbulence in the lee of high mountain ranges
will be common from mid afternoon through early evening. Isolated
afternoon and evening showers and thunderstorms, with bases around
12-15 kft MSL, will occur across the southern Sierra and central
Nevada region.

.SPOTTER INFORMATION STATEMENT...A few thunderstorms will be
possible over the southern Sierra and central Nevada zones this
afternoon and evening. Spotter activation is not anticipated, but
spotters are encouraged to provide reports according to standard
operating procedures.


Short Term/Aviation...Adair
Long Term...Salmen

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