385
FXUS65 KVEF 250808
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
110 AM PDT Fri Jul 25 2025

.KEY MESSAGES...

* Below-normal temperatures and afternoon southerly breezes expected
  to continue through the weekend before temperatures heat up next
  week.

* In general, dry conditions continue through the weekend into early
  next week. Monsoonal moisture increases across Arizona, resulting
  in precipitation chances for Mohave County mid-to-late week.
&&

.DISCUSSION...through Thursday. Midnight water vapor loop showed the
closed low in the vicinity of Monterey Bay and moving very slowly
northeast. The immediate term concern will be thunderstorm chances
in the Sierra. 24 hours ago, high res models were showing fewer
thunderstorms on Thursday versus what happened Wednesday, which was
incorrect. Tonight, the high res models are showing fewer
thunderstorms on Friday versus what happened on Thursday, and with
the low still nearby, suspect this trend may be incorrect again. As
the low finally weakens and gets absorbed into the mean flow over
the weekend, the decreasing trend will become more likely. Elsewhere
in our CWA, unseasonably dry conditions and below normal
temperatures persist in dry southwesterly flow through the weekend.
There is still excellent model agreement showing the big, hot high
pressure system which has brought steamy conditions to areas east of
the Rockies flexing west beginning Sunday. This will increase
temperatures to near normal for late July by Monday and Tuesday. The
big question mark is how much monsoon moisture will be advected into
our area as the ridge pushes west. There is better consensus among
long range ensembles that there will be enough moisture coming in
from the south to fuel chances for thunderstorms, although the exact
timing and areal extent are in question. Forecast will show a
gradual westward expansion of PoPs from Monday through Thursday,
although this should be interpreted as a middle-of-the-road
solution. The exact timing and westward extent will likely change as
we get closer.
&&

.AVIATION...For Harry Reid...For the 12Z Forecast Package...
Southerly breezes continue through today. A slight southeast
component is expected during the late morning and early afternoon
hours, but by the time gusts become more frequent, wind should shift
to a south-southwest direction. Gusts forecast to be around 20
knots, dropping off near sunset. Few to scattered clouds at or above
15kft. Temperatures approach 100F from 21z to 01z.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 12Z Forecast Package...Light winds early this
morning will give way to another day of southerly breezes this
afternoon. The exception to this is the KDAG area where winds remain
westerly. Gusts generally in the 15-25 knot range across the region,
but locally stronger gusts possible in the KBIH vicinity where gusts
to around 30 knots are possible. An isolated storm is possible on
the Sierra crest in the afternoon, but impacts in the Owens Valley
are unlikely. Few to scattered clouds at or above 12kft.
&&

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

$$

DISCUSSION...Morgan
AVIATION...Gorelow

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