Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 220938

Area Forecast Discussion
National Weather Service Las Vegas NV
239 AM PDT Tue Aug 22 2017

.SYNOPSIS...The focus area for thunderstorm activity shifts north to
the southern Great Basin today, then returns to much of the region
Wednesday as an area of low pressure approaches. Monsoon moisture
decreases and thunderstorm chances end for most of the area on
Thursday. High pressure regains control Friday, with dry and hot
weather expected through the weekend.

.SHORT TERM...through Thursday night.

Thunderstorms continue to develop and roll through parts of Arizona
this morning including northern Mohave County. Measured amounts have
been generally light and under a tenth of an inch so far.

The focus for thunderstorm development shifts north to the southern
Great Basin today. Moisture will be limited in this region and thus
will limit any flash flood threat. Increased instability is forecast
across much of the area Wednesday as an area of low pressure
approaches from the west. This will allow for a better coverage of
thunderstorm activity however, moisture remains limited and any
flash flood threat should be localized. Temperatures through the
short term will remain below normal.

LONG TERM...Friday through Monday.

High pressure will be developing over the forecast area Friday
through Sunday leading to dry conditions and a warming trend. High
temperatures by Sunday will be about 5 degrees above normal.
Confidence in the pattern for Monday is not particularly high but
model indications are that the high will start to shift a bit to the
east. This may lead to a bit of an easterly flow with some limited
moisture starting to push back into the area. For now we are going
with a slight chance of thunderstorms over the higher terrain in
just Mohave County for Monday afternoon.

.AVIATION...For McCarran...Diurnal winds are expected to set up
today, with a slight chance of thunderstorms mainly over the Spring

For the rest of southern Nevada, northwest Arizona and southeast
California...Winds become light and variable across the region and
generally favor diurnal trends today. Chances for showers and
thunderstorms will mainly be limited to the Sierra and south-central

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


Short Term/Aviation...Salmen
Long Term...Harrison

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