Severe Thunderstorm Warning 50, NWS Las Vegas, NV

Area Forecast Discussion
National Weather Service Las Vegas NV
224 PM PDT Fri Sep 1 2023

.SYNOPSIS...Thunderstorm activity will impact much of the forecast
area today and tomorrow as a plume of monsoonal moisture streams in
from the south. Heavy rainfall and flash flooding are the main
concerns. At the same time, strong southerly winds will affect parts
of eastern California and the southern Great Basin.
&&

.SHORT TERM...Through Sunday Night

Thunderstorm activity is expected to continue through tonight,
with another round tomorrow morning. The main concern with these
storms is heavy rainfall and flash flooding. This morning's Las
Vegas sounding showed a PWAT value of 1.42 inches. Atmospheric
moisture should remain in place through Saturday, then start to
shift north on Sunday night as the trough lifts inland and to the
northeast, taking the moisture with it. Wetter lower levels and
lower thunderstorm bases today and tomorrow should make strong
outflow winds less of a threat compared to Thursday's storms, but
still cannot be ruled out with some of the stronger storms. The
greatest potential for strong outflows this afternoon is in San
Bernardino County, where DCAPE values upwards of 1000 J/kg are
present. The areas of greatest thunderstorm activity includes
Lincoln, Clark, southern Nye, Mohave, and eastern San Bernardino
Counties. A Flood Watch is in place for those areas. The addition
of Morongo Valley to Flood Watch was made with this forecast
package. Additional isolated to scattered thunderstorm may also
develop on Sunday, mainly in Lincoln County and along higher
elevations of northern Mohave County and Clark County.

Another challenge in the short term is winds. A tightening pressure
gradient and development of a low level jet will result in a notable
increase in winds this afternoon over Inyo, Nye and Esmeralda
counties. Peak gusts between 45 and 50 mph warranted a Wind Advisory
in those counties for this afternoon and evening. Winds decrease but
remain gusty on Saturday and Sunday as the trough moves inland.

.LONG TERM...Monday through Friday

Zonal flow turns to the southwest as high pressure builds over the
south central United States. Rising heights and dry southwesterly
flow should end any precipitation chances through the end of the
workweek. Temperatures gradually rise through Friday but remain
below normal for this time of year.
&&

.AVIATION...For Harry Reid...A period of active weather is likely
through Saturday.  Gusty southerly winds to 30kts, along with
thunderstorm activity in the vicinity of the terminal, are possible
later this afternoon and early evening.  Model guidance shows a
period of calmer conditions mid-to-late evening, followed by gusty
southeast winds from distant thunderstorms affecting the field after
06Z.  Conditions improve some by day-break, but additional
thunderstorms with gusty winds are likely tomorrow afternoon and
evening, and direct impacts on the field will be possible.

For the rest of southern Nevada, northwest Arizona and southeast
California...Active weather is expected across much of the region
through at least Saturday.  Through this afternoon and early
evening, most of the convection is expected across northwest Arizona
and the Colorado River Valley.  There is the potential for gusty
outflow winds to affect the Las Vegas Valley TAF sites after 06Z.
Additional thunderstorms are likely across the eastern two-thirds of
the region on Friday, any of which will be capable of producing
gusty winds, heavy rainfall with reduced visibilities, and locally
moderate to severe turbulence.  Away from convective activity, gusty
south to southwest surface winds are forecast area-wide through
Friday.
&&

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

DISCUSSION...Meltzer
AVIATION...Planz

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
342 PM PDT Fri Sep 1 2023

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

0700 AM     Flash Flood      1 E Spring Valley       36.11N 115.22W
09/01/2023                   Clark              NV   Broadcast Media

            A sinkhole was opened on northbound Jones
            Blvd south of Flamingo Road which exposed a
            gas pipeline.

&&

TB3

Preliminary Local Storm Report
National Weather Service Las Vegas NV
346 PM PDT Fri Sep 1 2023

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

0325 PM     Flash Flood      9 NNW Vidal Junction    34.30N 114.65W
09/01/2023                   San Bernardino     CA   Law Enforcement

            CHP reports roadway flooding on Highway 95
            near Vidal Junction at Mile Marker 20.

&&

TB3

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Preliminary Local Storm Report
National Weather Service Las Vegas NV
434 PM PDT Fri Sep 1 2023

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

0700 AM     Flash Flood      1 NNW Railroad Pass     35.99N 114.92W
09/01/2023                   Clark              NV   Emergency Mngr

            Emergency manager reports mud and debris
            across Dawson Ave.

0842 AM     Flash Flood      4 NW Sam Boyd Stadium   36.12N 115.07W
09/01/2023                   Clark              NV   Dept of Highways

            Flooding on ramp from Flamingo to I-515
            northbound. All lanes closed.

0906 AM     Flash Flood      2 NE North Las Vegas    36.22N 115.09W
09/01/2023                   Clark              NV   Dept of Highways

            Road closed due to flooding in all
            directions at E. Cheyenne Ave. LV Blvd N.

0545 AM     Flash Flood      14 E Hualapai Peak      35.11N 113.67W
09/01/2023                   Mohave             AZ   Dept of Highways

            Hackberry Road closed from US93 to Austin
            Peak due to flooding.

0845 AM     Flash Flood      3 N Wikieup             34.74N 113.62W
09/01/2023                   Mohave             AZ   Dept of Highways

            Pump Station Road closed from US93 to Back
            Road due to flooding.

0855 AM     Flash Flood      10 N Wikieup            34.85N 113.64W
09/01/2023                   Mohave             AZ   Dept of Highways

            Huffritter Road closed from US93 to Back
            Road due to flooding.

0855 AM     Flash Flood      15 N Wikieup            34.91N 113.57W
09/01/2023                   Mohave             AZ   Dept of Highways

            Bogels Ranch Road closed from Back Road to
            Upper Trout Creek due to flooding.

&&

SC

Preliminary Local Storm Report
National Weather Service Las Vegas NV
507 PM PDT Fri Sep 1 2023

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

0645 PM     Tstm Wnd Dmg     1 NE Downtown Las Vegas 36.18N 115.14W
08/31/2023                   Clark              NV   Public

            Snapped tree at the Neon Museum near North
            Las Vegas Boulevard and McWilliams Avenue.

0855 AM     Flash Flood      5 SSE Wikieup           34.64N 113.57W
09/01/2023                   Mohave             AZ   Public

            Banagas Road is closed from Highway 93 to
            Back Road due to weather.

1130 AM     Flash Flood      12 W Valley of Fire Sta 36.46N 114.73W
09/01/2023                   Clark              NV   Park/Forest Srvc

            Valley of Fire State Park experienced
            flooding on the west side of the park via
            Valley of Fire Highway. Road is unpassable.

1148 AM     Non-Tstm Wnd Dmg Independence            36.80N 118.20W
09/01/2023                   Inyo               CA   Law Enforcement

            Tree fell on vehicle at Highway 395 and E.
            Pavilion Street.

0310 PM     Flash Flood      1 ESE Rice              34.08N 114.83W
09/01/2023                   San Bernardino     CA   Law Enforcement

            CHP reported a flash flood along State Route
            62. Vehicle will not accelerate due to water
            in the undercarriage.

&&

VARIAN