547
FXUS65 KVEF 212144
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
245 PM PDT Fri Aug 21 2026

.KEY MESSAGES...

* Above normal temperatures will continue into next week.

* Thunderstorm chances continue today but will decrease over the
  weekend.

&&

.DISCUSSION...through Thursday.

Today`s high temperatures will be a few degrees "cooler" than
temperatures were yesterday afternoon. However, an increase in
moisture will make today`s temperatures just as uncomfortable.
Temperatures will increase a degree or two over the weekend as
moisture decreases across the region. As a result, Major HeatRisk
(Level 3 of 4) will stick around through Sunday for the Las Vegas
Valley, Death Valley, Colorado River Valley, and lower elevations of
Mohave County. Next week, temperatures will continue to run around 2
to 4 degrees above normal, with afternoon temperatures topping out
in the normal-to-slightly-above-normal range and overnight low
temperatures running around 4 to 8 degrees warmer than normal.

Over the past 24-hours, moisture has increased across our forecast
area, with 1-inch PWats pushing into Lincoln County and southeastern
Inyo County. Locally, here in Las Vegas, PWats went from 0.88 inches
at 18Z yesterday to 1.19 inches on today`s 18Z sounding. This
moisture will help to fuel isolated-to-scattered showers and
thunderstorms across southern Nevada, northwestern Arizona, and
southeastern California. As is typical of the monsoon, storms will
favor areas of higher terrain for development and will tend to
dissipate as they move off the terrain. Erratic outflow winds,
lightning, and localized moderate-to-heavy rain will be possible
with any storms that develop. Flash flooding will be a concern with
any storms that begin training or in areas where there is continuous
redevelopment over the terrain. Storm coverage will decrease each
day over the weekend as moisture decreases.

&&

.AVIATION...For Harry Reid...For the 00Z Forecast
Package...Breezy south winds will continue through the afternoon at
8-10KT with gusts over 15KT. Winds will diminish this evening around
sunset with typical overnight wind patterns overnight. Similar winds
are expected Saturday with as southeast winds in the morning become
south with gusts over 15KT in the afternoon. Isolated showers and
thunderstorms will continue into the evening, remaining well north
of the terminals with no local impacts expected. Precipitation will
wane after sunset then Saturday should remain mostly dry across the
region. Temperatures will exceed 100F through 04Z this evening, then
again Saturday between 18Z and 04Z.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 00Z Forecast Package...South to southeast winds
will continue through the afternoon in many locations, gusting 15-
20KT at times. West to southwest winds will push into KDAG around
00Z and start gusting over 20KT. Winds will diminish around sunset
and follow typical wind patterns overnight. Isolated showers and
thunderstorms will develop this afternoon across the Southern Great
Basin- however latest forecasts suggests less coverage and impacts
with precipitation generally remaining away from TAF sites. Anything
that does develop will diminish this evening. Saturday`s winds will
be similar to today`s. Precipitation is possible in isolated spots
of the terrain of Sierra and Esmeralda County, but generally dry
conditions are expected.
&&

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures.

&&

$$

DISCUSSION...Stessman
AVIATION...Nickerson

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