Flash Flood Warning 174, NWS Las Vegas, NV

685 
WGUS75 KVEF 142011
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
111 PM PDT Sun Aug 14 2022

NVC003-142245-
/O.CON.KVEF.FF.W.0174.000000T0000Z-220814T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
111 PM PDT Sun Aug 14 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM PDT THIS 
AFTERNOON FOR WEST CENTRAL CLARK COUNTY...

At 111 PM PDT, Pockets of heavy rainfall continue this afternoon 
over the Spring Mountains with earlier rainfall of over 1 inch at 
Harris Springs. Excessive Runoff of local washes continues.

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

SOURCE...Radar.

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

Some locations that will experience flash flooding include...
  Rainbow Canyon, Spring Mountains, Mt. Charleston, Red Rock Canyon, 
  Summerlin, Kyle Canyon Campground, Fletcher View Campground, 
  Hilltop Campground, Mahogany Grove Campground, Rocky Gap 
  Campground, Lovell Canyon Campground and Mary Jane Falls 
  Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3610 11545 3613 11556 3625 11565 3633 11569
      3641 11559 3644 11548 3629 11537 3613 11539

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

$$

CO

228 
WGUS75 KVEF 142239
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
339 PM PDT Sun Aug 14 2022

NVC003-142249-
/O.EXP.KVEF.FF.W.0174.000000T0000Z-220814T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
339 PM PDT Sun Aug 14 2022

...FLASH FLOOD WARNING WILL EXPIRE AT 345 PM PDT THIS AFTERNOON FOR 
WEST CENTRAL CLARK COUNTY...

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

A Flood Watch remains in effect until 100 AM PDT Monday for portions 
of northwest Arizona, southeast California and Nevada.

LAT...LON 3610 11545 3613 11556 3625 11565 3633 11569
      3641 11559 3644 11548 3629 11537 3613 11539

$$

CO

Area Forecast Discussion
National Weather Service Las Vegas NV
1036 AM PDT Sun Aug 14 2022

.SYNOPSIS...A Flash Flood Watch continues for parts of the area
through this evening with scattered rain efficient thunderstorms
expected to develop late this morning and continue into the evening.
The threat of thunderstorms capable of producing heavy, possibly
intense, rainfall is expected to continue through next week. The
area should generally see below normal temperatures continuing,
especially in areas where cloud cover lingers and limits daytime
heating.
&&

.UPDATE...Another active monsoon day in store today, with less cloud
cover this morning than yesterday to limit convection. The 12Z
sounding has nearly 900 J/kg to tap into once we heat up, with a
convective temperature of 95F. With over an inch and a half of PWAT
and minimal 800mb steering flow, thunderstorms will be efficient
rain-makers today, resulting in increased chances of flash flooding,
particularly in vulnerable areas still recovering from previous
flood damage. No updates made to the forecast this morning, as it
looks to be in good shape.
&&

.SHORT TERM...A Flash Flood Watch continues for today across Lincoln
and Mohave counties, much of Clark County including Las Vegas, Lake
Mead and the Spring Mountains, and across the eastern half of San
Bernardino County. Thunderstorms in the watch area will be capable
of producing very heavy rain in a short period of time leading to an
increased threat of life threatening flash flooding. Expect storms
to start firing over the mountains late this morning with coverage
expanding through the afternoon, especially in Lincoln, Clark, and
Mohave counties before decreasing around sunset. Short range high
resolution models forecast less coverage in San Bernardino County
today but storms that do develop will be very efficient rain makers
with high rainfall rates and slow cell movement.

There is nothing in the weather pattern that indicates any
scouring of the moisture we have in place heading into Monday. In
fact, the overall environmental conditions are not forecast to
change a great deal. Slow moving, rainfall efficient storms are
indicated once again. Decisions will need to be made whether
another extension of the watch will be needed and in what areas
the highest threat will be. One other concern to note is high
pressure building north of our area on Monday. Depending on how
this plays out, the orientation of the pattern is favorable for a
storm motion that brings storms that develop over southwest Utah
into Clark County. Some of the stronger thunderstorm events of
the past in Las Vegas have occurred with storms moving in from the
northeast. Overall confidence is low but also not out of the
question. The only other large scale feature to note is an area of
low pressure over extreme southern Texas. Models bring this
feature slowly westward this week and it could come into play at
some point late in the week.

.LONG TERM...Tuesday through Saturday.

With moisture firmly entrenched, rain chances and below-normal
temperatures are expected to persist through the upcoming week. If
it seems like you've heard this before, well, you probably have. In
fact, the long term forecast discussions from a week ago would
likely still be valid today. South-southeasterly flow will continue
to usher in moisture as the upper-level high remains to our east.
This means that storms will be possible each afternoon, with the
best chances in the eastern half of the CWA. As usual, the main
concerns are likely to be heavy rain and flash flooding. One thing
to watch for is the possible development of a secondary high in the
upper Great Basin. This setup are favored for the northeasterly
storm event that bring strong winds into the Las Vegas Valley.
Otherwise, expect more of the same: afternoon storm chances with any
increased activity driven by mesoscale features formed from the
previous day's convection. Temps to remain near or below normal
given the surplus of moisture and cloud debris.
&&

.AVIATION...For Harry Reid...Another day of monsoonal thunderstorms
expected today, with slightly better chances for storms in the
direct vicinity of the Harry Reid terminal, however confidence is
still quite low. Did again include VCTS for the afternoon hours when
storms are most likely to occur. Similar to yesterday, some
projections also indicate late evening outflow originating from the
north but this did not occur yesterday. Left this out of the TAF due
to the uncertainty, but amendments may be needed if this indeed
comes to fruition.

For the rest of southern Nevada, northwestern Arizona, and
southeastern California...Another day of monsoonal thunderstorm
development will lead to the possibility of TSRA at
KEED/KIFP/KVGT/KHND. Perhaps the best chances for direct impact is
KHND and KEED this afternoon as nearby high terrain convection
pushes outflow to both terminals. Attempted to highlight this in
both TAF sites but amendments may be needed based off radar trends.
&&

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts from thunderstorms today according
to standard operating procedures. Possible impacts include heavy
rain resulting in flash flooding and strong winds.

&&

UPDATE...Varian
SHORT TERM...Salmen
LONG TERM...Woods
AVIATION...TB3

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