Flash Flood Warning 136, NWS Las Vegas, NV

Area Forecast Discussion
National Weather Service Las Vegas NV
1214 PM PDT Sat Sep 2 2023

.SYNOPSIS...Numerous storms expected this afternoon and evening
with heavy rain and flash flooding expected. Drier conditions will
spread across the region tomorrow with storms becoming more
limited to Northwest Arizona and eastern Nevada. Dry conditions
return area wide Monday onward with cooler than normal
temperatures for Labor Day trending above normal by next weekend.
&&

.SHORT TERM...through Sunday night.

Storms are starting to ignite across the region as peaks in the
cloud cover have allowed convective temperatures to be reached. As
expected, given our very moisture rich airmass sampled in this
mornings 12z VEF sounding, storm development thus far has been
very rainfall efficient. A storm near Sandy Valley, NV recently
produced nearly 1.5 inches of rain, much of which came down in
less than 30 minutes. As storm coverage increases through the
afternoon, additional pockets of very heavy rainfall are likely
with flash flooding a big concern. As mentioned in this mornings
update, the 12z HREF suggests storm development early this
afternoon could favor the Spring Mountains and western Clark
County, with activity creeping into the western Las Vegas Metro
by later in the afternoon.

Drier air will begin to work in from the west on Sunday thanks to
our offshore Pacific trough finally moving inland and into the
Great Basin. This will tend to limit the thunderstorm chances into
our eastern zones, especially across Lincoln County and northern
Mohave County, through a few scattered storms could pop as far
west as the Spring Mountains. Additionally, breezy southwesterly
winds will accompany the approaching trough, with a few gusts to
near 40 mph especially across the Western Mojave Desert and near
the Sierra.

.LONG TERM...Monday through Saturday.

The first half of the workweek will favor continued troughing across
the western US, with our region sandwiched between shortwave troughs
traversing the PacNW and Great Basin regions, while low amplitude
high pressure holds firm over northern Mexico. This will keep
temperatures a few degrees below normal for Labor Day with
occasional afternoon breezes. Temperatures will remain on the cool
side of average through Wednesday before high pressure begins to
build northward later in the week. This will spark a warming trend
Thursday through Saturday as high temperatures climb slightly above
normal. Good news for flood clean up efforts, dry conditions are
expected area wide through next weekend.

&&

.AVIATION...For Harry Reid...Light easterly winds until around 20z
when winds begin to turn southerly and convection is forecast to
develop. Similar to yesterday, storms are expected in the Las Vegas
Valley through the afternoon and evening hours. Heavy rain, reduced
visibility, CIGs below 6000 feet with terrain obscuration, and gusty
winds will all be possible. Convection should be out of the valley
by 06z, but abundant low-level moisture from heavy rain may keep
CIGs at or below 6000 feet through the night. Light and variable
winds overnight.

For the rest of southern Nevada, northwest Arizona and southeast
California...Similar to yesterday, storms are expected to develop
early this afternoon and continue into evening hours. Heavy rain,
reduced visibility, CIGs below 6000 feet with terrain obscuration,
and gusty winds will all be possible. Convection should largely be
done by 06z, but abundant low-level moisture from heavy rain may
keep CIGs at or below 6000 feet through the night in locations that
see the most rain. Light and variable winds overnight.

&&

.SPOTTER INFORMATION STATEMENT...Heavy rain and thunderstorms are
expected through this evening. Spotters are encouraged to report
heavy rainfall, flood impacts, and any other severe weather
according to standard operating procedures.

&&

DISCUSSION...Outler
AVIATION...Woods

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
241 PM PDT Sat Sep 2 2023

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

0145 PM     Flash Flood      2 N Enterprise          36.06N 115.25W
09/02/2023                   Clark              NV   Public

            Water and debris flowing over Warm Springs
            at Tenaya.

0147 PM     Flash Flood      3 NNW Enterprise        36.06N 115.26W
09/02/2023                   Clark              NV   Public

            Water flowing over Warm Springs at Buffalo.

0201 PM     Flash Flood      3 NW The Strip          36.15N 115.20W
09/02/2023                   Clark              NV   Trained Spotter

            Intersection of Sahara and Arville flooded
            with water half way up car tires.

0210 PM     Flash Flood      2 NNW Green Valley      36.07N 115.09W
09/02/2023                   Clark              NV   Public

            Intersection of Sunset at Sandhill flooded
            and impassable.

0237 PM     Flash Flood      3 SE Downtown Las Vegas 36.14N 115.11W
09/02/2023                   Clark              NV   NWS Employee

            Intersection of Sahara and McLeod flooded
            with the water up to car windows.

0226 PM     Flash Flood      6 ENE Yermo             34.93N 116.71W
09/02/2023                   San Bernardino     CA   Law Enforcement

            Flooding on Hacienda between Coyote Lake and
            Harvard. Road is impassable.

&&

Preliminary Local Storm Report
National Weather Service Las Vegas NV
315 PM PDT Sat Sep 2 2023

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

0242 PM     Flash Flood      4 ESE Downtown Las Vega 36.15N 115.09W
09/02/2023                   Clark              NV   Emergency Mngr

            Intersection of Sahara and Walnut flooded
            with high water rescues ongoing.

0242 PM     Flash Flood      4 WNW Sam Boyd Stadium  36.11N 115.08W
09/02/2023                   Clark              NV   Emergency Mngr

            Intersection of Harmon and Lamb flooded with
            high water rescues ongoing.

0242 PM     Flash Flood      3 SSE Downtown Las Vega 36.13N 115.11W
09/02/2023                   Clark              NV   Emergency Mngr

            Intersection of McLeod and Desert Inn
            flooded with high water rescues ongoing.

0242 PM     Flash Flood      3 NW Sam Boyd Stadium   36.12N 115.07W
09/02/2023                   Clark              NV   Emergency Mngr

            Intersection of Flamingo and Boulder Highway
            flooded with high water rescues ongoing.

0300 PM     Flash Flood      3 WNW Frenchman Mtn     36.20N 115.03W
09/02/2023                   Clark              NV   Trained Spotter

            Intersection of Lake Mead and Mt Hood
            flooded with several vehicles disabled by
            flood waters.

&&
Planz

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