148
FXUS65 KVEF 052144
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
244 PM PDT Tue Aug 5 2025

.KEY MESSAGES...

* Smoke from wildfires in southern California will continue to
  impact the area through at least tomorrow.

* Hotter than normal temperatures and dry conditions will continue
  into the weekend. An Extreme Heat Warning is in effect for
  portions of southeast California and northwest Arizona on
  Wednesday and Thursday.

* Critical fire weather conditions are expected across portions of
  southern Nevada on Wednesday and Thursday.

&&

.DISCUSSION...through Monday.

Visible satellite imagery and area webcams show smoke streaming
across southeastern California and into southern Nevada from
wildfires in California. Hazy/smokey skies will continue through at
least Wednesday for much of the area as we continue to find
ourselves under southwesterly flow aloft. This upper-level pattern
will continue to transport smoke from the Gifford Fire (82,587
acres), Gold Fire (936 acres), and Rosa Fire (1,535 acres) across
southeastern California and into southern Nevada and northwest
Arizona. Of these three fires, the Gold Fire, located north of Big
Bear, is responsible for the hazy skies over Las Vegas today. As
smoke and haze continue to filter through the area, air quality
will continue to fluctuate.

Temperatures will continue to increase a degree or two each day,
peaking on Thursday. These hotter than normal temperatures will
result in Moderate-to-High HeatRisk (Levels 2 and 3 of 4) across
southern San Bernardino County into southern Mohave County and up
the Colorado River Valley on Wednesday and Thursday. These levels of
heat will affect heat sensitive individuals as well as anyone
without access to adequate hydration or proper cooling. Those with
outdoor recreation plans should make sure to take proper precautions
to mitigate adverse heat impacts. While temperatures will decrease
slightly as we head into the weekend, they will still remain above
normal as high pressure persists over the region.

A low pressure system will roll through the Pacific Northwest on
Wednesday and Thursday, which will result in breezy southerly-to-
southwesterly winds picking up across southern Nevada. These winds
combined with afternoon relative humidities bottoming out in the
single digits will result in critical fire weather conditions for
portions of southern Nevada. For more information, see the FIRE
WEATHER section below.

&&

.FIRE WEATHER...A Red Flag Warning has been issued for Nevada
Fire Weather Zone 461 on Wednesday and a Fire Weather Watch has been
issued for Nevada Fire Weather Zone 461 on Thursday. Both of these
fire headlines are for low humidity and increased winds. Southerly-
to-southwesterly winds will pick up across the Great Basin on
Wednesday and Thursday in response to a low pressure system
rolling through the Pacific Northwest. These 15 to 20 mph winds
with gusts up to 30 mph combined with single digit relative
humidity values in the afternoon will result in critical fire
weather conditions. Any fires that develop will have the potential
to spread rapidly. Outdoor burning and recreation with sparks is
not recommended.

&&

.AVIATION...For Harry Reid...For the 00Z Forecast Package...Breezy
southwesterly winds will continue through into the early evening
with 20 to 25 knot wind gusts dropping off after sunset. Winds
will continue to maintain a southerly-to- southwesterly direction
with sustained speeds under 10 knots through through tomorrow
morning before picking back up tomorrow afternoon. Slantwise
visibility reductions will continue through Wednesday, especially
along the Daggett corridor. The potential for temporary surface
visibility reductions also exists, but is lower than yesterday.
Temperatures tomorrow will exceed 100F between 19Z and 04Z,
peaking near 108F.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 00Z Forecast Package...With the exception of
the western Mojave Desert where winds will favor a more westerly
direction, breezy southerly-to-southwesterly winds will continue
into the evening hours across the region with 20 to 25 knot wind
gusts will dropping off after sunset. Winds across southern Nevada
and the Colorado River Valley will continue to favor a more
southerly-to-southwesterly direction through the overnight hours
while the western Mojave Desert maintain a westerly direction and
winds in the Owens Valley shift to nocturnal downvalley winds
overnight. Slantwise visibility reductions are likely across
portions of the region through tomorrow, with the most significant
impacts expected from the Barstow/Daggett area to Las Vegas.
Temporary reductions in surface visibility are also possible at
KDAG. Surface reductions cannot be ruled out at the Las Vegas area
terminals, but the likelihood is less.

&&

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

&&

$$

DISCUSSION/AVIATION/FIRE WEATHER...Stessman


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