Flash Flood Warning 173, NWS Las Vegas, NV

764 
WGUS75 KVEF 142014
FFSVEF

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

CAC071-142230-
/O.CON.KVEF.FF.W.0173.000000T0000Z-220814T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
114 PM PDT Sun Aug 14 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM PDT THIS 
AFTERNOON FOR SAN BERNARDINO COUNTY...

At 114 PM PDT, Doppler radar indicated thunderstorms producing heavy 
rain acrossNew York and Castle Mountain as well as eastern Mojave 
Preserve. Flash flooding is ongoing or expected to begin shortly.

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...
  Mid Hills Campground....Ivanpah Road...Lanfair Road...Black Canyon 
  Road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3543 11517 3519 11488 3503 11499 3503 11525
      3514 11547 3522 11540

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

$$

CO

186 
WGUS75 KVEF 142223
FFSVEF

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

CAC071-142233-
/O.EXP.KVEF.FF.W.0173.000000T0000Z-220814T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
323 PM PDT Sun Aug 14 2022

...FLASH FLOOD WARNING WILL EXPIRE AT 330 PM PDT THIS AFTERNOON FOR 
SAN BERNARDINO COUNTY...

The heavy rain has ended as storms moved south of the area. 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 3543 11517 3519 11488 3503 11499 3503 11525
      3514 11547 3522 11540

$$

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

For more forecast information...see us on our webpage:
https://weather.gov/lasvegas or follow us on Facebook and Twitter