300
FXUS65 KVEF 031752
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
1052 AM PDT Sun Aug 3 2025

.KEY MESSAGES...

* Mostly dry conditions and slightly-above normal temperatures
  continue through the weekend and into the start of next week.

* Temperatures increase to well-above normal mid-to-late week, with
  Moderate to Major Heat Risk in desert valleys. Extreme Heat Watch
  in effect for southern zones Wednesday and Thursday.

&&

.DISCUSSION...Today through Sunday.

Conditions remain largely dry across the forecast area, with the
persistent dry southwesterly flow aloft, thanks to troughing in the
Pacific Northwest and ridging across the southern CONUS / northern
Mexico. Expect sunny skies, temperatures slightly-above normal, and
afternoon south-southwesterly breezes through the remainder of the
weekend. Monday and Tuesday, an incoming trough will deamplify the
southern CONUS ridge, which will help moderate temperatures into
early next week. This trough may shift the ridge far enough east to
encourage a modest monsoonal moisture flow up the Colorado River
Valley Tuesday and Wednesday. Forecast ECMWF ensemble PWATs have
diminished slightly, but continue to show 0.50 to 0.75" of PWAT from
Laughlin / Bullhead City to Las Vegas. NBM PoPs remain very slight
(5 - 15%) and isolated to far eastern Mohave County Wednesday
through Friday.

Mid-to-late week, the southern CONUS ridge of high pressure builds
westward across the Desert Southwest. This will result in rising
heights over our forecast area and temperatures increasing to 6 to 8
degrees above seasonal normals. "Moderate" (Level 2 on a scale 0 to
4) HeatRisk becomes widespread on Wednesday across southeastern
California, southern Nevada, and northwestern Arizona, with "Major"
(Level 3 on a scale 0 to 4) HeatRisk along the Colorado River Valley
and southern Mohave County. Major HeatRisk spreads further north on
Thursday, with pockets of "Extreme" (Level 4 on a scale 0 to 4). As
a result, Extreme Heat Watches are in effect for southern Mohave
County and southern San Bernardino County as well as the Colorado
River Valley for Wednesday and Thursday. Troughing in the Pacific
Northwest and Intermountain West will help to deamplify the ridge
over the Desert Southwest heading into next weekend, which will
moderate temperatures closer to seasonal normals.
&&

.AVIATION...For Harry Reid...For the 18Z Forecast Package...Winds
will shift to the southwest early this afternoon, persisting
thereafter. Gusts to 15-20KT are expected this afternoon through
mid evening, with a brief lull expected before gusts to 20-25KT
return overnight. While there is uncertainty in the persistence of
gusts, expect 20-25KT gusts to continue at least intermittently
thereafter through the end of the period. VFR conditions prevail
with increasing high clouds and lofted smoke from wildfires that
is not expected to produce any surface visibility reductions.
Temperatures will exceed 100F between 20Z-04Z, peaking at 107F.


For the rest of southern Nevada, northwest Arizona and southeast
California...For the 18Z Forecast Package...Gusty southerly to
southwesterly winds will develop this afternoon through early
evening, with gusts to 15-25KT expected. Winds diminish after
sunset, through at Las Vegas Valley terminals, gusts return after
06Z. Exceptions are across the Owens Valley, where gusty winds
will vary between the west and north, diminishing overnight, and
the western Mojave where gusty west winds will continue. VFR
conditions will prevail, with ceilings at KDAG improving as lofted
smoke mixes out, and increasing high clouds expected through the
period with hazy skies and smoke not expected to produce any
surface visibility reductions.

&&

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

&&

$$

DISCUSSION...Soulat
AVIATION...Phillipson

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