952
FXUS65 KVEF 172205
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
305 PM PDT Tue Jun 17 2025

.KEY MESSAGES...

* Extreme Heat Warning remains in effect Wednesday and Thursday
  with triple digit highs and warm overnight low temperatures.

* Hazardous fire weather conditions are becoming increasingly
  probable Thursday through Saturday as gusty winds and low
  humidities develop each afternoon. This may lead to multiple
  days of increased fire spread potential.

* Cooler or "less hot" temperatures expected Sunday into early
  next week, bringing some relief from the heat.

&&

.DISCUSSION...

Upper level high pressure will gradually build into the region
over the next 48 hours. This will favor hotter conditions with
temperatures some 5-10 degrees above seasonal normals. This
combined with warm overnight lows will promote a protracted period
of major Heat Risk. As such, Extreme Heat Warning remains in
effect Wednesday and Thursday. A gradual cooling of temperatures
is expected Friday through the weekend, which will allow for a
lesser risk of heat-related impacts.

Several days of enhanced fire potential are coming into better
focus with the latest ensemble guidance. A slow moving but potent
late season upper trough will result in increasing southwesterly
winds Thursday through at least Saturday. This coupled with
residual heat/low humidities, and drying fuels, looks to promote
near critical to critical fire spread potential across portions of
the Desert Southwest. The Storm Prediction Center has outlined
portions of the area in 40-70% probabilities of critically low
humidity and winds beginning Thursday and lasting into Saturday.
As confidence increases in precise timing and magnitude of impact,
fire weather headlines will likely be needed.

As the potent upper trough advertised by the ensembles settles
into the Southwest U.S., falling heights will yield a stretch of
below normal temperatures for late June. As opposed to our normal
low 100s, ensemble analysis points to highs in the 90s Sunday and
Monday, perhaps even into Tuesday. The result will be a rather
pleasant start to the last week of June by our summer standards.

&&

.AVIATION...For Harry Reid...For the 00Z Forecast Package...As
high pressure builds in over southern Nevada, we look to enter a
more diurnal flow pattern. This will result in west/southwest
winds this evening, shifting around to the north/northeast after
sunrise Wednesday. Winds to generally remain 10 knots or less.
Another hot day is on tap Wednesday, with temperatures in the
hundreds from 18z- 05z, peaking around 110 degrees at 00z
Wednesday.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 00Z Forecast Package...With high pressure
building into the region, expect a mainly diurnal wind flow
pattern. Aside from KDAG, winds generally look to remain 10-15
knots or less. KDAG will see an increased push of westerlies
overnight with gusts up to 20 knots. Otherwise, clear skies and
VFR conditions to prevail.

&&

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

&&

$$

KEY MESSAGES/DISCUSSION/AVIATION...Austin


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