800
FXUS65 KVEF 011035
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
335 AM PDT Mon Sep 1 2025

.KEY MESSAGES...

* Another day of above-normal temperatures and widespread Moderate
  Heat Risk for Labor Day.

* Monsoonal moisture returns through the week, with chances of
  precipitation returning areawide and temperatures moderating
  closer to seasonal normals.

&&


.DISCUSSION...Today through Sunday.

A ridge of high pressure will continue to build over the Desert
Southwest today, making today the hottest day of the forecast
period. With height rises comes forecast afternoon temperatures 3 to
6 degrees above seasonal normals underneath mostly sunny skies.
Widespread "Moderate" Heat Risk expected today, with pockets of
"High" Heat Risk in the lower desert valleys including Death Valley,
Pahrump Valley, southern portions of the Las Vegas Valley, and the
Colorado River Valley. Those recreating outside today are encouraged
to drink plenty of water and fluids with electrolytes and to keep
outdoor activities to the cooler parts of the day.

The exception of the "mostly sunny skies" will be across the higher
elevations of southern Mohave County today, where high resolution
Convective Allowing Models (CAMs) continue to highlight the
potential for afternoon convection. Forecast HRRR soundings in
southern Mohave County show an inverted-V shape, indicating dry air
at the surface. As such, primary concerns today will be gusty winds
from the direction of storms and frequent lightning. On Tuesday, a
shortwave will push into the coast of California, which will shift
our aforementioned ridge eastward. This shift will allow additional
monsoonal moisture to usher northward into the Mojave Desert, with
over 1.00" of PWAT in Las Vegas. As the shortwave pushes inland, the
resultant instability, forcing, and moisture will increase chances
of precipitation areawide Tuesday and Wednesday. Primary hazards
will include moderate-to-heavy rainfall, isolated flash flooding,
and frequent lightning. Moisture scours out of the region northwest-
to-southeast through the rest of the work week, which will confine
precipitation chances to our eastern zones. Meanwhile, temperatures
will favor values near seasonal normals.
&&


.AVIATION...For Harry Reid...For the 06Z Forecast Package...Winds
will follow their typical daily directional patterns with speeds
of 10 knots or less through tomorrow morning. Easterly winds may
flirt with 10 knots at times tomorrow afternoon. Wind speed will
decrease after sunset. VFR conditions will persist with FEW mid-
level clouds will develop over the higher terrain tomorrow
afternoon. Temperatures will top out around 104, with temperatures
exceeding 100F between 20Z and 04Z.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 06Z Forecast Package...Smoke from the Garnet
Fire on the west side of the Sierra is forecast to move into the
Owens Valley tonight, with temporary reductions in visibility
possible through the overnight period into the morning hours. Winds
will follow typical daily directional patterns through tomorrow
morning with sustained speeds of 12 knots or less. Breezy southerly
winds will pick up across the area tomorrow, with the exception of
the western Mojave Desert where breezy east-southeastely winds will
pick up in the afternoon.
&&


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

&&

$$

DISCUSSION...Soulat
AVIATION...Stessman

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