415
FXUS65 KVEF 260815
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
115 AM PDT Thu Sep 26 2024

.SYNOPSIS...Temperatures will continue to increase during the
second half of the week with an Excessive Heat Warning going into
effect for the Colorado River Valley later this morning and
continuing through the weekend. An Excessive Heat Warning will go
into effect for Death Valley National Park tomorrow morning and
will also run through the weekend. Unseasonably warm temperatures
and dry conditions will continue into next week.

&&

.SHORT TERM...through Saturday.

The upper-level ridge responsible for these unseasonably hot
temperatures will slowly migrate back to the west, moving overhead
on Friday and Saturday. This will allow for the persistence of above
normal temperatures through the weekend with temperatures increasing
each day through Saturday. These increasing temperatures mean
increasing HeatRisk, with widespread Major HeatRisk in the Colorado
River Valley today. Pockets of Extreme HeatRisk will pop up in the
Colorado River Valley over the weekend as temperatures peak and the
cumulative effects of multiple days of excessive heat take their
toll. The lower elevations of Death Valley will see widespread Major
HeatRisk on Friday, with widespread Extreme HeatRisk over the
weekend. Given the prolonged duration of Major-to-Extreme HeatRisk,
an Excessive Heat Warning has been issued for Death Valley National
Park from Friday morning through Sunday night. Speaking of Excessive
Heat Warnings, the Excessive Heat Warning for the Colorado River
Valley has been extended through Sunday night as temperatures will
continue to remain around 8 to 12 degrees above normal.

Saturday still looks to be the hottest day of the forecast period
and those planning on recreating outdoors should make sure to take
proper precautions to minimize the risk of adverse heat impacts.
Shifting outdoor activities to avoid the heat of the day (i.e.,
10:00 AM to 4:00 PM) is recommended. If you are unable to avoid
being outdoors during the heat of the day make sure to remain well
hydrated with water and sports drinks. Wearing light weight and
light colored clothing, hats, sunglasses, and sunscreen are
additional actions you can take to help mitigate adverse heat
related impacts.

.LONG TERM...Sunday through next Thursday

A slight change to the upper air pattern may bring a little relief
from the heat next week. The upper level ridge remains in place over
the Four Corners, but the intrusion of a closed low off the southern
California coast should force lower heights aloft. This in turn
should decrease temperatures at the surface by a few degrees.
Moderate (Level 2) HeatRisk is spread across the desert valleys into
the middle of next week, but there are signs that Major (Level 3) to
Extreme (Level 4) HeatRisk in Death Valley and the Colorado River
Valley may start to wane on Tuesday and Wednesday. The probability
of reaching 100 degrees in Las Vegas falls from 90 percent on Sunday
to 50 percent on Monday, then gradually decreasing each day through
next week. Besides heat, light winds and dry conditions will
prevail.

&&

.AVIATION...For Harry Reid...Easterly wind 8 kts or less between
later this afternoon into early evening. Otherwise, the wind will be
less than 6 kts and favor typical diurnal directions. High
temperatures will eclipse 100 degrees each afternoon through the
weekend. No significant clouds or weather expected through
Saturday.

For the rest of southern Nevada, northwest Arizona and southeast
California...Diurnal wind regime generally 10 knots or less expected
at regional TAF sites through Friday. No significant clouds or
weather expected through Friday.

&&

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

&&

$$

SHORT TERM...Stessman
LONG TERM...Meltzer
AVIATION...Pierce

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