916
FXUS65 KVEF 212154
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
254 PM PDT Thu Aug 21 2025

.KEY MESSAGES...

* Extreme Heat Warnings and Heat Advisories continue through
  Saturday as hotter than normal temperatures stick around.

* Monsoon activity increases over the coming days, with scattered
  showers and storms likely over the weekend and next week. Strong
  outflow winds and flash flooding will be possible.

&&

.DISCUSSION...through Wednesday.

Oppressive heat continues through Saturday with widespread major
HeatRisk and pockets of extreme HeatRisk. While afternoon highs
won`t be the highest we`ve seen this year, overnight lows will
likely be the warmest. Across the lower Mojave Desert, highs will be
in the 105-115 range with lows between 85-95. This level of heat
affects anyone without adequate cooling and hydration. Temperatures
begin to subside next week as clouds and precipitation chances
increase while heights decrease.

Speaking of precipitation chances, those will continue to spread
westward in the coming days. Today, chances are largely confined to
eastern Mohave and Lincoln counties. Tomorrow, activity spreads to
the I-15 corridor and Sierra. We`ll have to watch how things evolve
on the Mogollon as models continue to show outflow and convection
surging west in the evening, potentially bringing strong/severe
winds to southern parts of Mohave and San Bernardino counties. The
SPC has actually issued a marginal risk of severe winds in this
area. Over the weekend, scattered convection continues across the
area, posing the typical monsoon hazards of flash flooding, strong
outflow winds, and frequent lightning. Next week, a weak trough off
the CA coast begins to provide upper-level support for more
widespread showers and storms, posing the same hazards but perhaps
to a greater extent.

&&

.AVIATION...For Harry Reid...For the 00Z Forecast Package...Southwest
breezes largely remain below 10 knots, but a few brief periods of
10-12 knots and gusts 16-18 knots possible this afternoon, mainly
after the turn to the south. Light easterly winds resume tomorrow
morning after sunrise. Isolated convection is possible south/west
of the valley Friday afternoon, which may kick some southwesterly
outflow through the terminal. Few to scattered mid-level and high
clouds. Temperatures to exceed 100F until 06z tonight and again
by 18z Friday.


For the rest of southern Nevada, northwest Arizona and southeast
California...For the 00Z Forecast Package...Light winds generally
following typical, daily patterns today and tonight. Speeds
largely around 10 knots or less with the exception of the Owens
Valley where gusts 15-20 knots are expected. Few to scattered mid-
level and high clouds across most of the area, but greater cloud
coverage in eastern Mohave and Lincoln counties where isolated
convection is possible this afternoon. Similar wind patterns on
Friday but storm chances spread to the I-15 corridor and the
Eastern Sierra. Gusty and erratic outflow winds likely near any
storms.

&&

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

&&

$$

DISCUSSION/AVIATION...Woods


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