480
FXUS65 KVEF 070804
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
104 AM PDT Sun Sep 7 2025

.KEY MESSAGES...

* Monsoonal moisture will support one more round of isolated shower
  and thunderstorm activity this afternoon.

* A drying trend is expected the first half of the week as flow
  becomes more westerly. Relatively cooler temperatures will also
  overspread the region by mid week.

&&

.DISCUSSION...Through next Saturday.

Although the downward trend in moisture continues today, there is
still enough moisture and instability for isolated thunderstorms
this afternoon. CAMs show potential over Mohave County, the Colorado
River Valley, and eastern San Bernardino County. Forecast soundings
still indicate pockets of deep moisture and PWATs in the 1 to 1.5
inch range in these areas, which means that heavy downpours and
flash flooding still can`t be ruled out. Soundings also show 1200 to
1500 J/kg DCAPE, meaning gusty outflow winds are also within the
realm of possibility. Convection should favor high terrain where
forcing is the greatest and activity will end after sunset with a
loss of surface heating.

A large upper trough will track east into the California coast early
this week, pushing any remaining moisture out of the forecast area.
With lower heights, temperatures become 5-10 degrees below seasonal
normals by midweek. This means highs in the low 90s to upper 80s for
Las Vegas. The drier air will also bring more relief overnight with
cool morning lows, including temperatures in the low 70s in Las
Vegas by midweek. Temperatures may start to increase again towards
next weekend as the low exits east and heights aloft begin to
rise.

&&

.AVIATION...For Harry Reid...For the 06Z Forecast Package...Generally
light winds expected overnight with wind speeds under 8 knots expected.
Southerly winds with gusts to near 20 knots expected tomorrow afternoon
before weakening after sunset. Thunderstorm activity will be minimal
Sunday with temperatures remaining below 100 degrees.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 06Z Forecast Package... Drier conditions expected
Sunday though a few isolated thunderstorms will remain possible across
Northwest Arizona and the southern Mojave Desert. Otherwise, light winds
in the morning will before breezy in the afternoon out of the south
or southwest with gusts to near 20 knots, with directions favoring
more westerly directions near KDAG.

&&

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

&&

$$

DISCUSSION...Meltzer
AVIATION...Outler

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NWS Flagstaff Office