904
FXUS65 KVEF 082133
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
233 PM PDT Mon Sep 8 2025

.KEY MESSAGES...

* Fall-like system brings breezy winds, cooler temperatures, and dry
  conditions to the Desert Southwest this week.

* Dense smoke and poor air quality will return for the Owens Valley
  each night through midweek as a result of the Garnet Fire.

&&

.DISCUSSION...Today through Sunday.

Afternoon high temperatures will be right around seasonal normals
today, making today the hottest day of the forecast period. Heights
will gradually fall as a fall-like trough approaches the Pacific
Coast over the next few days, deamplifying the monsoonal high. As a
result, pressure gradients will tighten with a southwest flow aloft,
bringing gusty southwest winds and dry conditions to the region
through the week. The exception to the dry conditions will exist
along the Sierra Crest as well as portions of the southwestern Great
Basin, where modest moisture coupled with lift and daytime heating
may result in an isolated shower or thunderstorm. As such, slight
precipitation chances (5-20 percent) exist for our northwestern
zones Wednesday through Friday. Temperatures bottom out late-week at
6 to 10 degrees below seasonal normals before recovering through the
weekend as the system jogs east.

The Garnet Fire east of Fresno is around 53,000 acres with around 15
percent containment. North-northwesterly winds brought dense smoke
down the Owens Valley last night, with visibility at the Eastern
Sierra Regional Airport (KBIH) dropping below 2 statute miles for
much of the overnight period and poor air quality observed on area
sensors as far south as Olancha. Southerly winds this afternoon have
improved air quality and visibility substantially. Barring any
substantial changes to fire behavior, the Owens Valley can expect a
repeat of dense smoke, poor air quality, and low visibilities each
night through midweek.
&&


.AVIATION...For Harry Reid...For the 00Z Forecast Package... Gusty
south-southwesterly winds will continue through the afternoon and
early evening, with gust speeds peaking around 25 kts. Gusts
decrease in speed and frequency after sunset before returning late-
morning on Tuesday with speeds between 25 and 30 kts. FEW aoa 25
kft. Temperatures will remain below 100 degrees.

For the rest of southern Nevada, northwestern Arizona and
southeastern California...For the 00Z Forecast Package... Gusty
south-southwest winds will continue across the Las Vegas Valley and
Colorado River Valley this afternoon, with gust speeds peaking
around 25 kts. KBIH visibilities have improved substantially this
afternoon, but will reduce once again after sunset with the return
of northerly winds. KDAG will gust from the west between 25 and 30
kts intermittently throughout the TAF period. FEW aoa 25 kft.
&&


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

&&

$$

DISCUSSION/AVIATION...Soulat


For more forecast information...see us on our webpage:
https://weather.gov/lasvegas or follow us on Facebook and Twitter

NWS Flagstaff Office