Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 230938

Area Forecast Discussion
National Weather Service Las Vegas NV
240 AM PDT Wed Aug 23 2017

.SYNOPSIS...Isolated thunderstorms will return to much of the
region today, then moisture decreases and thunderstorm chances end
on Thursday. High pressure regains control Friday, with dry and hot
weather expected through the weekend.

215 PM PDT Tue Aug 22 2017

.SHORT TERM...through Friday night.

A more active weather day is expected today as an area of low
pressure approaches from the west and combines with limited moisture
and weak instability across the region to produce showers and
thunderstorms. Followed the lead of the evening update and kept
higher pops for Clark and Mohave counties which lie in favored
regions for upwards motion. Due to the limited amount of available
moisture, stronger cells today may produce brief heavy rain that
causes localized flooding and gusty winds. Moisture gets pushed
further east on Thursday with thunderstorm chances shifting to
Mohave County. Dry weather is expected Friday with temperatures
rising to above normal.

.LONG TERM...Saturday through Tuesday.

The main story during the long term is heat as high pressure builds
over Nevada during the weekend. It looks like high temperatures will
be 5-8 degrees above normal by Sunday with similar temperatures
persisting through Tuesday. Dry conditions are expected Saturday and
Sunday. While there are some model differences with the high
position Monday and Tuesday, there is still a good possibility that
it may shift just enough to allow some sort of easterly component to
the flow, bringing in a modest increase in moisture. We are not
talking anything significant, just enough to go with a slight chance
of thunderstorms for some of the higher terrain of Mohave County
Monday, with slight chances spreading west to the Sierra and Spring
Mountains Tuesday.

.AVIATION...For McCarran...Diurnal winds are expected today,
however there will be better chances for thunderstorms in the
mountains and northwest Arizona, and even a chance in the Las Vegas
Valley, which could impact the terminal at least with gusty and
erratic winds.

For the rest of southern Nevada, northwest Arizona and southeast
California...Typical diurnal winds are expected across the region
this morning. This afternoon, a southerly wind will setup and remain
through the evening with speeds around 5-15 knots. Shower and
thunderstorm activity will increase this afternoon with the activity
focused over the southern Sierra, northwest Arizona, and Clark
County mountains.

.SPOTTER INFORMATION STATEMENT...Thunderstorm chances will continue
through today 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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