301
FXUS65 KVEF 201832
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
1132 AM PDT Sun Sep 20 2026

.KEY MESSAGES...

* Dry and seasonable conditions will give way to increased
  precipitation chances and a relative cool down on Monday and
  Tuesday.

* Temperatures will recover during the second half of the week with
  low precipitation chances returning for northwest Arizona as we
  head into the weekend.

&&

.DISCUSSION...through Sunday.

Plenty of high clouds streaming into the area today ahead of an
upper low off the central California coast. This low will move
onshore tomorrow and provide the chance of showers and thunderstorms
(30 to 60%) to much of the region but will favor Inyo County and the
southern Great Basin. This convective activity may continue well
into the evening across Lincoln County. Instability will be somewhat
limited, generally, 100-300 J/kg. Temperatures will cool marginally
behind the low on Tuesday with most locations 3 to 6 degrees cooler
than high temperatures that we will see today. The low will eject
fairly quickly to the northeast on Tuesday morning but there may be
a few lingering showers into the early afternoon in Lincoln County.

Generally, dry southwesterly flow will be in place for the rest of
the week and into next weekend. The exception to this is with the
ensemble guidance hinting towards a modest uptick in moisture mainly
south and east of Las Vegas on Thursday and Friday. Currently, the
best chances of precipitation associated with this moisture are
around 10 to 20 percent in Mohave County. Temperatures will be
around their seasonal normals on Wednesday and increase a few
degrees on Thursday and remain fairly flat into the weekend.

&&

.AVIATION...For Harry Reid...For the 18Z Forecast Package...Winds
will follow typical daily directional patterns through Monday
morning, with speeds expected to remain around 8KT or less. Early
Monday afternoon, winds will shift to the southeast, increasing to
around 10KT with sporadic higher gusts to 15-18KT expected,
especially during the mid-afternoon. VFR conditions will prevail
with increasing mid-level and high clouds with bases at or above
15kft.


For the rest of southern Nevada, northwest Arizona and southeast
California...For the 18Z Forecast Package...Winds through the next
24 hours will generally follow typical daily directional
patterns, with speeds around 5-10KT. The primary exception will be
the northern Owens Valley, including KBIH, where up-valley winds
will become gusty this afternoon, with gusts to 20-25KT expected
at times through early evening. VFR conditions will prevail with
increasing clouds with bases at or above 15kft.

&&

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

&&

$$

DISCUSSION...Czyzyk
AVIATION...Phillipson

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NWS Las Vegas (VEF) Office