Damaging Wind in Nevada, July 23, 2023

Area Forecast Discussion
National Weather Service Las Vegas NV
753 PM PDT Sun Jul 23 2023

.SYNOPSIS...Entrenched moisture and strong high pressure to our
east will favor afternoon and evening monsoon thunderstorm
activity Monday and Tuesday. Conditions become less favorable
Wednesday through Friday with mainly dry conditions forecast. There
could be a resurgence of monsoon storms in Mohave County next
weekend when conditions become more favorable once again.
Temperatures will be more seasonal for the upcoming week with
highs forecast to be just slightly above normal.

&&

.UPDATE...Current radar imagery shows isolated showers and
thunderstorms moving through portions of Mohave, Clark, and Lincoln
Counties. The storms over Mohave County produced an outflow boundary
that is currently pushing westward through the central part of the
county. 30-40 mph wind gusts and blowing dust are associated with
this boundary, with small storms popping up behind it. In Clark
County, southeasterly flow aloft has resulted in a series of pop-up
storms originating over the Mccullough Range and drifting into the
southern portion of the Las Vegas Valley. This convective activity
will continue for the next few hours, gradually dying down and
eventually dissipating later this evening. Another round of monsoon
convection will be possible tomorrow afternoon.

Locally, here in Las Vegas, we recorded a high temperature of 110
degrees, bringing our streak of consecutive days with highs of 110
or greater to 10 days. This ties the record for the longest streak
of 110+ degree days for the Las Vegas area. The ridge responsible
for this heat has settled over the Four Corners region, which opened
the door for the monsoonal moisture responsible for the
aforementioned convection. The ridge being positioned further to our
east combined with the increase in moisture and associated cloud
cover will allow for temperatures to cool a few degrees on Monday
and Tuesday. As such, the Excessive Heat Advisory that has been in
effect for much of the region will be allowed to expire on time at
8:00 pm this evening.

&
.DISCUSSION...Monday through next Sunday.

Shortwave energy associated with a low pressure system northwest
of Vancouver Island is forecast to move into the PacNW Coast on
Monday which nudges the area of high pressure centered over the Four
Corners Region eastward to north central New Mexico and south
central Colorado. Moisture is forecast to remain entrenched over the
area however leading to another day of enhanced shower/thunderstorm
activity Monday afternoon across portions of San Bernardino, Clark,
Lincoln, and especially Mohave County. Troughing over the northwest
CONUS extends further inland on Tuesday which further suppresses the
high pressure ridge centered over New Mexico. The trough influences
lead to some drying across our central and western areas, focusing
the best chance of storms to Mohave County with more isolated type
storm activity as far west as the Spring Mountains. The drying trend
becomes obvious on Wednesday with slight chances confined to the
eastern portions of Mohave County.

Dry weather is forecast for Thursday and Friday before monsoonal
flow becomes a little more favorable again next weekend and
potentially brings storm chances back to parts of Mohave County.
The drier weather could bring a slight uptick in temperatures late
in the week

&&

.AVIATION...For Harry Reid...Southwest wind gusting to 20KT through
the afternoon with periods of CIGs AOA 15kft. The potential for
convection will bring periods of erratic wind as thunderstorm
outflow approaches the terminal. Gusts of 35-40KT are possible with
stronger storms.

After 05Z, thunderstorm activity should diminish although variable
wind direction may persist with any lingering outflow winds. Winds
will eventually become light and diurnal overnight and continue
through Monday morning.

For the rest of southern Nevada, northwest Arizona and southeast
California...Showers and thunderstorms will impact several areas
this afternoon. The highest risk for thunderstorms with be in far
southern Nevada through western Arizona, with some showers possible
in southeast California. Sudden gusty winds to 40KT+, lightning,
CIGs to 10kft, and brief heavy rain will be possible with convection
today. Thunderstorm chances will linger through about 06Z before
quickly diminishing tonight.

Prevailing winds will increase out of the south to southwest this
afternoon. West to southwest winds expected at KBIH this afternoon
around 00Z. Winds tonight should follow diurnal wind patterns
however, overall confidence in the wind forecast for areas that may
be impacted by thunderstorms is low as outflows may influence local
winds. The highest risk for convective winds and outflows will be
through the Colorado River Valley where east or southeasterly
outflows may push through between 03Z-08Z.

&&

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

&&

UPDATE...Stessman
DISCUSSION...Salmen
AVIATION...Berc

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

Preliminary Local Storm Report
National Weather Service Las Vegas NV
713 PM PDT Sun Jul 23 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0615 PM     Tstm Wnd Gst     16 NE South Cove        36.25N 113.89W
07/23/2023  M61 MPH          Mohave             AZ   Mesonet

            At approximately 6:15 pm PDT, the Nevershine
            RAWS recorded a thunderstorm wind gust of 61
            mph. Time estimated using radar.

&&

MS