Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 231011

Area Forecast Discussion
National Weather Service Las Vegas NV
310 AM PDT Tue May 23 2017

.SYNOPSIS..A strong ridge of high pressure over the region will
boost temperatures well above normal today and Wednesday before
giving way to a trough moving down from western Canada which will
bring readings down around 10 degrees by Friday. A weak disturbance
will produce slight chances for afternoon and evening thunderstorms
across the southern Sierra and southern Great Basin Wednesday, along
with gusty southwest to west winds for the Mojave Desert Wednesday
afternoon through Thursday.

.SHORT TERM...through Thursday.

Well above normal temperatures today and Wednesday will be knocked
back to near normal by Thursday as gusty southwest winds return. An
amplified ridge extending from southern California up into southwest
Canada will be pushed inland today ahead of a trough swinging into
British Columbia. The base of this trough will brush northern Nevada
Wednesday and pull a weak upper low off the California Coast across
the southern Sierra and central Nevada Wednesday afternoon and
evening. This will bring sufficient mid level moisture and
instability across those zones to produce a chance of showers and
thunderstorms before it moves to the east by Thursday morning.
Another shortwave dropping down from the north will reinforce the
trough over northern Nevada and produce breezy to windy conditions
across the region. The strongest winds will be focused over
northwest San Bernardino County and periods of gusts over 40 mph are
likely from Barstow to Fort Irwin and nearby sections of I-15 and I-
40 late Wednesday afternoon through Thursday evening. Temperatures
will peak around 10 degrees above normal today and Wednesday before
heights fall with the trough dropping down from British Columbia.

.LONG TERM...Friday through Tuesday.

Shortwave trough will swing into northern Nevada and Utah on Friday
and make its way across the local area Friday night into early
Saturday. Breezy conditions will accompany this feature Friday and
Friday night as temps drop down for the last day before the holiday
weekend warms up. Majority of the precip with this shortwave will
remain to our northeast where environment will be more supportive of
showers and storms. Trough will shift eastward Saturday and Sunday
as ridge builds in across the western US. This will leave Memorial
Day Weekend with most areas seeing dry weather, lighter winds, and
temps warming slightly each day, remaining right around normal
Saturday and Sunday and rising slightly above normal by Monday. Each
day should be mostly sunny with some extra high clouds moving in
from the southwest throughout the day on Monday ahead of a weak
midlevel trough approaching the southern California coast.
Orographics lift and influx of moisture along the southern Sierra
will allow for a few isolated showers each day throughout the
weekend primarily during the afternoon hours with addition of
diurnal heating. More active weather pattern is expected to begin
after Tuesday of next week.


.AVIATION...For McCarran...A clear sky and diurnal winds generally
less than 8 knots can be expected under an area of high pressure
today and tonight.

For the rest of southern Nevada...northwest Arizona and southeast
California...An area of high pressure will provide clear skies and
generally light winds across the region today and tonight.

.SPOTTER INFORMATION STATEMENT...No significant weather is expected
today. A few thunderstorms will be possible over the southern Sierra
and central Nevada zones Wednesday 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...Guillet

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