959
FXUS65 KVEF 252306
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
406 PM PDT Fri Sep 25 2026

.KEY MESSAGES...

* Temperatures will continue to warm through Saturday before cooling
  off by the start of the week.

* Confidence is increasing in clouds, rainfall, and cooler readings
  Sunday through Tuesday as tropical moisture spreads northward.

&&

.DISCUSSION...This Afternoon through Thursday.

A weak 500mb ridge will continue to keep temperatures a few degrees
above normal through Saturday. Highs in the mid-90s to low 100s will
be common in the lower desert valleys, while higher elevations, such
as the Spring Mountains, will see highs of 65 to 70 degrees.
Overnight lows will also remain on the warm side, with minimums
staying 5 to 10 degrees above seasonal norms. Readings will begin to
cool by the second half of the weekend as a trough approaches from
the west and increased moisture spreads northward.

Models continue to come into better agreement on how the trough
approaching the West Coast this weekend will evolve and interact
with tropical moisture from hurricanes Odalys and Polo. The initial
increase in moisture from Odalys will arrive Sunday, bringing
scattered showers and thunderstorms mainly to Mohave and southern
San Bernardino Counties. As the trough continues to move eastward
Sunday night into Monday, moisture from Polo will also begin to
spread into the region. The GFS and ECMWF show similar overall
solutions, but the trough`s timing will determine where the greatest
rain chances develop. If it moves faster, most of the moisture will
be pushed east toward Arizona and New Mexico. A slower trough would
draw more moisture northward, increasing the chances of showers and
thunderstorms across the eastern half of the CWA. WPC has placed the
eastern half of Mohave County in a Slight Risk area for excessive
rainfall on Monday. Storms there could produce locally heavy
rainfall and flash flooding, though the area of greatest concern
will depend on how quickly the trough moves east. The presence of
the cutoff upper-level low over the area Monday afternoon could also
support a few stronger storms. Rain chances will diminish Tuesday as
the trough moves east into the Four Corners region, with quieter
weather expected for the remainder of the forecast period.

&&

.AVIATION...For Harry Reid...For the 00Z Forecast Package...Gusty
southwesterly winds persist through sunset. Afterwards, winds
maintain a southwesterly direction through most of the night with
speeds under 10 knots. Variable winds take hold for much of the
morning. Gusty southwesterly winds return by late morning, lasting
through the afternoon. FEW to SCT mid and high clouds will pass over
the area throughout the TAF period.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 00Z Forecast Package...Gusty southwesterly
winds in the Owens Valley and Las Vegas Valley will weaken after
sunset. Elevated westerly winds at KDAG will persist later into the
night. For tomorrow, another round of gusty southerly to
southwesterly winds will pick up in the Las Vegas Valley and Owens
Valley in the late morning and afternoon, with peak gusts between 18
and 24 knots. In the Colorado River Valley, winds maintain a
southerly to southwesterly direction with speeds under 10 knots. FEW
to SCT mid and high clouds will pass over the area throughout the
TAF period.

&&

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

&&

$$

DISCUSSION...Planz
AVIATION...Meltzer

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