Flash Flood Warning 30, NWS Las Vegas, NV

792 
WGUS75 KVEF 012128
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
228 PM PDT Tue Aug 1 2023

NVC003-012315-
/O.CON.KVEF.FF.W.0030.000000T0000Z-230801T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
228 PM PDT Tue Aug 1 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT THIS 
AFTERNOON FOR CENTRAL CLARK COUNTY...

At 228 PM PDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Up to 3 
inches of rain have fallen. Flash flooding is ongoing or expected to 
begin shortly.

HAZARD...Life-threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar and automated gauges.

IMPACT...Life-threatening flash flooding of low-water crossings,
         creeks, normally dry washes and roads.

Some locations that will experience flash flooding include...
  mainly rural areas of Central Clark County southeast of Jean.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3559 11519 3566 11537 3581 11529 3580 11511

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

MW

717 
WGUS75 KVEF 012312
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
412 PM PDT Tue Aug 1 2023

NVC003-012322-
/O.EXP.KVEF.FF.W.0030.000000T0000Z-230801T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
412 PM PDT Tue Aug 1 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 415 PM PDT THIS AFTERNOON FOR 
CENTRAL CLARK COUNTY...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3559 11519 3566 11537 3581 11529 3580 11511

$$

MW

Area Forecast Discussion
National Weather Service Las Vegas NV
110 AM PDT Tue Aug 1 2023

.SYNOPSIS...A compact upper disturbance will continue to provide
enhanced lift within a high moisture environment for another round
of thunderstorm development today. Thunderstorm activity will
continue into Wednesday before dry weather and hot conditions
return to the area Thursday through the weekend.

&&

.SHORT TERM...Tonight through Thursday night.

For the rest of tonight and Tuesday, convection in our area will
be influenced by an upper trough which lifted northward out of
Mexico on Monday. A combination of highly anomalous moisture,
multiple embedded features within the trough, and generally light
steering flow is leading to rain efficient storms producing
roughly 1-2 inches of rain per hour. Additionally, a multitude of
outflow boundaries from thunderstorms have produced gusty winds
to around 40 mph in places. High temperatures yesterday were
cooler across the board as advertised, falling to or below
seasonal averages. Further cooling is expected today with high
temperatures expected to be around 5 degrees cooler then Monday.

Regarding expected convective activity today, scattered showers
and thunderstorms are forecast generally east of a line extending
from Barstow CA to Tonopah NV with more isolated type storms west
of this line. Lincoln County is forecast to be the focus area for
numerous showers/storms this afternoon but there is a high
probability for storms developing in Clark, Mohave, and eastern
San Bernardino counties including the Mojave National Preserve
where the York wildfire is ongoing. Hires models forecast a number
of strong outflow winds with storms today although the location
of any individual storm and subsequent strength of the outflow
winds will be more of a near-term mesoanalysis determination.

Models begin to show signs of drying under a southwest flow aloft
on Wednesday however it is primarily confined to the far
southwest and western portions of the forecast area. Much of the
rest of the region remains under the threat of experiencing more
thunderstorm activity. The highest chances are over Lincoln
County and northern Mohave County. Scattered storms are possible
across much of southern Nevada, parts of southeast California, and
Mohave County in northwest Arizona. Thunderstorm activity mostly
ends overnight Wednesday into Thursday with only a few isolated
storms lingering in northern Lincoln and northern Mohave counties
Thursday afternoon as dry southwest to west flow aloft takes
control. Temperatures claw their way back to 100 degrees in Las
Vegas on Wednesday then climb closer to seasonal levels on
Thursday.

.LONG TERM...Friday into Next Week...
The plume of Monsoonal moisture responsible for early week showers
and storms will lift northeastward as high pressure becomes
reestablished across the southwest U.S. This results in rather high
confidence in a return to hot and dry conditions this weekend. All
of the ensembles point to this solution, with the National Blend of
Models depicting a return of highs some 5 to 10 degrees above
seasonal normals. This would mean highs of 105 to 110 in the Vegas
Valley, and naturally hotter in our more heat-prone areas such as
Death Valley and the Colorado River Basin. Otherwise, rather benign
weather conditions are on tap with virtually no chance of meaningful
precipitation.

&&

.AVIATION...For Harry Reid...Gusty northeast winds will continue at
the terminal over the next few hours before falling into a light and
variable pattern through the remainder of the early-morning hours.
Mid-morning, winds will generally favor the east-northeast remaining
below 8 kts. As the afternoon progresses, winds will become south-
southeasterly between 10 and 15 kts. The exception to this will be
in the event that thunderstorms form in the vicinity of the
terminal, which could kick out gusts between 30 and 35 kts, with the
best chances of occurrence between 20 and 02Z. Reduced surface and
slant visibility can be expected through the TAF period due to smoke
from the York Fire in the Mojave National Preserve.

For the rest of southern Nevada, northwestern Arizona, and
southeastern California...Another day of scattered showers and
thunderstorms expected. With thunderstorm formation will come the
risk of gusts between 30 and 35 kts at local terminals. Best chances
of vicinity thunderstorms for the Las Vegas Valley TAF sites will be
between 20 and 02Z; best chances for the Colorado River Valley TAF
sites will be between 22 and 04Z; best chances for KDAG will be
between 20 and 06Z. KBIH can expect VCSH between 23 and 08Z, though
an isolated instance of a thunderstorm cannot be ruled out.
Otherwise, the prevailing wind direction across the region will be
south-southwest. Some reduction in surface and slant range
visibility can be expected through the TAF period across Clark,
northern Mohave and eastern San Bernardino counties due to smoke
from the York Fire in the Mojave National Preserve.

&&

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

&&

SHORT TERM...Salmen
LONG TERM...Austin
AVIATION...Varian

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