Flash Flood Warning 272, NWS Las Vegas, NV

670 
WGUS75 KVEF 121229
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
529 AM PDT Mon Sep 12 2022

AZC015-NVC003-121330-
/O.CON.KVEF.FF.W.0272.000000T0000Z-220912T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-Clark NV-
529 AM MST Mon Sep 12 2022 /529 AM PDT Mon Sep 12 2022/

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 AM MST/630 AM 
PDT/ THIS MORNING FOR WEST CENTRAL MOHAVE AND CENTRAL CLARK 
COUNTIES...

At 529 AM MST /529 AM PDT/, Doppler radar indicated thunderstorms 
producing heavy rain across the warned area. Flash flooding is 
ongoing or expected to begin shortly at beaches along Lake Mohave 
including Cottonwood Cove. Rain rates of 0.5 inches in 30 minutes 
observed on the eastern side of Lake Mohave along Highway 93 near 
Willow Beach.

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...
  Boulder City, Cottonwood Cove, Cottonwood Cove Campground, Dolan 
  Springs and Willow Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3543 11477 3566 11484 3575 11486 3585 11490
      3595 11489 3600 11478 3599 11470 3590 11451
      3536 11424 3533 11442 3539 11461

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

$$

JV

579 
WGUS75 KVEF 121326
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
626 AM PDT Mon Sep 12 2022

AZC015-NVC003-121336-
/O.EXP.KVEF.FF.W.0272.000000T0000Z-220912T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-Clark NV-
626 AM MST Mon Sep 12 2022 /626 AM PDT Mon Sep 12 2022/

...FLASH FLOOD WARNING WILL EXPIRE AT 630 AM MST/630 AM PDT/ THIS 
MORNING FOR WEST CENTRAL MOHAVE AND CENTRAL CLARK COUNTIES...

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.

A Flood Watch remains in effect until 800 AM MST/800 AM PDT for a 
portion of northwest Arizona.

LAT...LON 3543 11477 3566 11484 3575 11486 3585 11490
      3595 11489 3600 11478 3599 11470 3590 11451
      3536 11424 3533 11442 3539 11461

$$

JV

Area Forecast Discussion
National Weather Service Las Vegas NV
223 AM PDT Mon Sep 12 2022

.SYNOPSIS...Scattered to numerous showers and thunderstorms
accompanied by heavy rain will continue to occur primarily over
northwest Arizona this morning. Additional rounds of heavy rain are
possible over parts of southern Nevada and northwest Arizona
Tuesday. Southwest flow should finally bring a drying trend late in
the week into the weekend.
&&

.SHORT TERM...through Tuesday night.

Water vapor imagery shows mid-level trough moving into southern
California this morning. Prime diffluent region ahead of the trough
positioned over the lower Colorado River Valley sparking numerous
thunderstorms over western Arizona currently. We area seeing
isolated storms as well over southern Nevada and eastern San
Bernardino County. Hi-res model simulations hitting southern Mohave
County the hardest this morning as storms train over the same area
producing heavy rain and increased flash flood threat. A few
automated gauges have already reported about a half an inch or rain.
Due to the high rainfall rate potential and training storms have
issued a flash flood watch for southern Mohave County through 8 am
MST this morning.

Active period will continue into Tuesday as trough gets absorbed by
trough moving into the PacNW and lifts northeast over the area.
Plenty of available moisture remains in place with ECMWF EFI and QPF
M-Climate output supporting potential of heavy rain over parts of
southern Nevada and northern Mohave County. Did expand the existing
flood watch south into Clark and northern Mohave County.

.LONG TERM...Wednesday through the Weekend.

The shortwave is expected to continue to lift northeast and weaken
on Wednesday, moving into southwest Utah by Wednesday night. Behind
the wave, a reinforcing upper level jet is expected to move into the
souther Great Basin region. With residual moisture still in place
Wednesday and Thursday, there is a continued chance for showers and
storms Wednesday through Thursday as pieces of energy and additional
upper level support from the jet streak move over the area. Moisture
will be on the downward trend though, so expecting lower
precipitation chances and impacts on Wednesday through Thursday
compared to Tuesday. However, impacts due to heavy rain are still
possible through the southern Great Basin as ensemble QPF M-Climates
still signal potential above normal precipitation, especially on
Wednesday. Wednesday afternoon will also be the better chance
compared to Thursday afternoon for convection as models show
elevated CAPE and negative LIs in that area Wednesday but not so
much on Thursday.

By Friday, dry air will be in place over the region. Ensembles show
zero probabilities for PWATS over 1in by Friday afternoon. The
current forecast has no chances for precipitation across the region
Friday through the weekend. Afternoon breezes are possible this
weekend, however impactful winds are not expected at this time.
Temperatures the second half of the week will actually warm slightly
each day, however they will not get much above normal as on
Wednesday we will be starting below normal.

&&

.AVIATION...For Harry Reid...Around 11Z, winds are
expected to shift to the southeast with 15-20 knot gusts likely.
Additionally, showers and thunderstorms will begin to move into the
vicinity of the airport around that time. These showers and possible
thunderstorms will likely move into the terminal area between 11Z
and 15Z. As showers move over the terminal area and the Las Vegas
Valley they will likely be accompanied by variable gusty winds.
There looks to be a break in the chance of showers/thunderstorms
between 15Z-20Z. Storms expected to fire after 20Z over the higher
terrain and potentially move into the valley late afternoon or early
evening. Don't be surprised if more storms fire overnight in or
around the valley.

For the rest of southern Nevada, northwest Arizona and southeast
California...KVGT and KHND are expected to follow similar trends to
KLAS, showers and thunderstorms will begin to move into the Las
Vegas Valley around 11Z with winds picking up and swinging to the
southeast at that time. The most likely time for precipitation to
impact the terminal areas is between 11Z and 12Z. Elsewhere,
isolated to scattered showers and thunderstorms possible today
through Tuesday. Surface visibility at terminals could be reduced to
1-3SM in heavy rain.

&&

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

SHORT TERM/AVIATION...Pierce
LONG TERM...Nickerson

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