Flash Flood Warning 201, NWS Las Vegas, NV

619 
WGUS75 KVEF 180023 RRA
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
523 PM PDT Wed Aug 17 2022

CAC071-180215-
/O.CON.KVEF.FF.W.0201.000000T0000Z-220818T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
523 PM PDT Wed Aug 17 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM PDT THIS 
EVENING FOR SAN BERNARDINO COUNTY...

At 523 PM PDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. 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...
  Needles, Highway 95 And I-40 and Mohave Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3464 11525 3498 11500 3495 11463 3491 11463
      3488 11464 3487 11463 3486 11462 3485 11463
      3478 11483 3462 11485

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

$$

DB

492 
WGUS75 KVEF 180211
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
711 PM PDT Wed Aug 17 2022

CAC071-180221-
/O.EXP.KVEF.FF.W.0201.000000T0000Z-220818T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
711 PM PDT Wed Aug 17 2022

...FLASH FLOOD WARNING WILL EXPIRE AT 715 PM PDT THIS EVENING FOR 
SAN BERNARDINO COUNTY...

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

LAT...LON 3464 11525 3498 11500 3495 11463 3491 11463
      3488 11464 3487 11463 3486 11462 3485 11463
      3478 11483 3462 11485

$$

DB

Area Forecast Discussion
National Weather Service Las Vegas NV
142 PM PDT Wed Aug 17 2022

.SYNOPSIS...Thunderstorm chances will continue through Saturday
before high pressure building in from the Pacific brings a temporary
break Sunday through Tuesday. Locally heavy rain will be possible
with thunderstorms, with the greatest risk in and east of Mohave
County. Temperatures will hover slightly below normal, more so in
areas which see the most clouds and rain.
&&

.SHORT TERM...through tonight. Early afternoon satellite loop showed
scattered thunderstorms bubbling near and southeast of I-15, with
shallower cumulus farther north and west. Surface obs showed light
winds away from thunderstorms, and temperatures a few degrees higher
than 24 hours ago. The main concerns with thunderstorms this
afternoon and evening are heavy rain/flash flooding and strong
downburst winds. A tongue of precipitable water at or above 1.5
inches which will fuel heavy rain potential was located up the
Colorado River Valley, including eastern San Bernardino, western
Mohave, and southern Clark counties. Drier air above the deeper
moisture, as evidenced by 6.95 um water vapor imagery, will be
available for entrainment into taller updrafts, fueling downburst
wind potential. High resolution models are showing potential for
thunderstorms over the southern Great Basin to persist through the
evening and overnight, where strong winds will be more of a threat
than heavy rain.

.LONG TERM...Thursday through the Weekend.
The focus of the long term is the remnants of the tropical system
that impacted the Texas Gulf Coast a few days ago. The
aforementioned Pacific trough will shift northeast and EC/GEFS
means indicate a broad area of high pressure setting up off the
coast. This would serve to effectively block the tropical moisture
from progressing farther west and into the Pacific, but instead
halt its motion over southern Arizona and set the stage for a
multiple periods of heavy rainfall over the southern half of the
state, from Thursday night into Sunday. That high pressure over
the Pacific may continue to build into the weekend and shift
slowly eastward, when it does, the troughing over Arizona deforms
and stretches out, lessening the focused lifting over southern
Arizona but distributing vort maxes across much of the state. This
should serve to bring widespread heavy rainfall across much of the
state, including Mohave County, and perhaps as far west as the
Mojave Preserve and the CRV. As of now, GEFS/EC/GEM agree in
keeping the heaviest QPF along and south of the I-40 corridor, but
this would put many of the hardest hit areas of Mohave County in
the area of concern for further flash flooding impacts such as
Golden Valley, Kingman, and the Hualapai Mountains.

There is still some uncertainty however, as the ridge could build
in quicker and push the moisture swath farther east per some of
the minority clusters. There does appear to be a pretty stark
PoP/QPF gradient as a result of this ridge building in, which is
currently keeps much of Inyo, Esmeralda, Nye, and western San
Bernardino more or less dry. But if the forecast trends wetter or
even maintains its current expectations, then would think that a
FF Watch again for at least Mohave looks like a safe bet for
Friday and Saturday.
&&

.AVIATION...For Harry Reid...Scattered thunderstorms are expected
once again through this afternoon and into the early evening mainly
over the higher terrain surrounding the Las Vegas Valley. While
there is a slight chance that storms could directly affect the
terminal late this afternoon and early evening, a more likely
scenario is for gusty winds from outflows to move through the area
this evening, and this is included in the TAF. Outside of
thunderstorm activity today, winds should be light with skies SCT
AOA 12kft. Additional thunderstorm activity is expected on Thursday,
possibly starting earlier in the day near 18Z. Again, it looks like
most will remain over the higher terrain, but can rule out a storm
developing in the valley.

For the rest of southern Nevada, northwest Arizona and southeast
California...Scattered thunderstorms are expected area-wide once
again today and into this evening. Storms are expected to develop
over the higher terrain surrounding KBIH by mid-afternoon, possibly
directly affecting the field after 22Z.  Storms will be more
scattered in nature near KDAG with the activity expected mainly
during the late afternoon or early evening.  The Lower Colorado
River Valley sites will see the best chance of storms during the
evening hours. Outside of thunderstorm activity, light winds
favoring typical diurnal trends are expected along with skies SCT
AOA 12kft. Outside of any outflow boundary influences overnight,
winds will remain light. Another day of scattered mainly afternoon
and evening thunderstorms expected Thursday potentially affecting
all TAF sites.
&&

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

SHORT TERM...Morgan
LONG TERM...TB3
AVIATION...Gorelow

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