Flash Flood Warning 131, NWS Las Vegas, NV

321 
WGUS75 KVEF 101949
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
1249 PM PDT Wed Aug 10 2022

AZC015-102115-
/O.CON.KVEF.FF.W.0131.000000T0000Z-220810T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
1249 PM MST Wed Aug 10 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 PM MST THIS 
AFTERNOON FOR SOUTHERN MOHAVE COUNTY...

At 1249 PM MST, Doppler radar and automated rain gauges indicated 
thunderstorms produced between 1 and 2 inches of rain just to the 
north and east of Pine Lake and Hualapai Mountain Park before noon. 
Rainfall has since diminished over the warned area. Flash flooding 
is ongoing over the north and northeast portions of Hualapai 
Mountain which drain across DW Ranch and Blake Ranch roads.

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

SOURCE...Radar and automated gauges.

IMPACT...Life-threatening flash flooding.

Some locations that will experience flash flooding include...
  Dw Ranch Road and Blake Ranch Road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3519 11392 3519 11390 3518 11380 3515 11375
      3504 11372 3496 11377 3496 11387 3502 11397
      3515 11399

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

$$

JA

534 
WGUS75 KVEF 102106
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
206 PM PDT Wed Aug 10 2022

AZC015-102116-
/O.EXP.KVEF.FF.W.0131.000000T0000Z-220810T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
206 PM MST Wed Aug 10 2022

...FLASH FLOOD WARNING FOR THE FLAG BURN SCAR WILL EXPIRE AT 215 PM 
MST THIS AFTERNOON FOR SOUTHERN MOHAVE 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 1200 AM MST Thursday for 
portions of northwest Arizona, southeast California and Nevada.

LAT...LON 3519 11392 3519 11390 3518 11380 3515 11375
      3504 11372 3496 11377 3496 11387 3502 11397
      3515 11399

$$

CM

639 
WGUS45 KVEF 112045
FFWVEF
AZC015-112345-
/O.NEW.KVEF.FF.W.0131.220811T2045Z-220811T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
Issued by National Weather Service Flagstaff AZ
145 PM PDT Thu Aug 11 2022

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  West Central Mohave County in northwestern Arizona...

* Until 445 PM MST.

* At 145 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain and flooding in the Dolan Springs area near Archibald 
  Wash. 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...
  Dolan Springs, Pierce Ferry And Antares Roads, Packsaddle 
  Campground, Windy Point Campground and Chloride.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3545 11398 3531 11425 3568 11450 3589 11443
      3588 11409

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

$$

TB3

747 
RWUS32 KVEF 112137
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
Issued by National Weather Service Flagstaff AZ
237 PM PDT Thu Aug 11 2022

AZC015-112345-
/O.CON.KVEF.FF.W.0131.000000T0000Z-220811T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
237 PM MST Thu Aug 11 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MST THIS 
AFTERNOON FOR WEST CENTRAL MOHAVE COUNTY...

At 237 PM MST, Doppler radar and automated rain gauges indicated 
continued thunderstorms producing flash flooding. Reports of 
flooding at Archibald Wash and Pierce Ferry Road have occurred in 
the last hour. Between 1 and 1.5 inches of rain have fallen per area 
observations. As thunderstorms continue to develop and remain almost 
stationary, worsening flash flooding is expected in these areas.

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...
  Dolan Springs, Pierce Ferry And Antares Roads, Packsaddle 
  Campground, Windy Point Campground and Chloride.

This activity is producing very heavy rainfall and likely very fast 
flowing water over some roadways. Additionally, frequent cloud to 
ground lightning is occurring with these storms.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3545 11398 3531 11425 3568 11450 3589 11443
      3588 11409

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

$$

TB3

537 
RWUS32 KVEF 112307
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
Issued by National Weather Service Flagstaff AZ
407 PM PDT Thu Aug 11 2022

AZC015-112345-
/O.CON.KVEF.FF.W.0131.000000T0000Z-220811T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
407 PM MST Thu Aug 11 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MST THIS 
AFTERNOON FOR WEST CENTRAL MOHAVE COUNTY...

At 407 PM MST, While most of the heavy rainfall has ended, 
significant runoff is occurring at the Archibald Wash and likely 
many other washes in the Dolan Springs area. Several cars are 
stranded due to flowing water over Pierce Ferry Road.

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...
  Dolan Springs, Pierce Ferry And Antares Roads, Packsaddle 
  Campground, Windy Point Campground and Chloride.

Flood control webcam footage showed significant flowing water 
resulting in stranded cars on Pierce Ferry Road. This runoff is 
expected to continue through the next hour. Please avoid Pierce 
Ferry Road and heed road closure signs as it will protect your life.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3545 11398 3531 11425 3568 11450 3589 11443
      3588 11409

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

$$

TB3

948 
WGUS45 KVEF 112332
FFWVEF
AZC015-120045-
/O.EXT.KVEF.FF.W.0131.000000T0000Z-220812T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
Issued by National Weather Service Flagstaff AZ
432 PM PDT Thu Aug 11 2022

The National Weather Service in Las Vegas has extended the

* Flash Flood Warning for...
  West Central Mohave County in northwestern Arizona...

* Until 545 PM MST.

* At 432 PM MST, Runoff from earlier thunderstorms in the area 
  continues to pose a threat to life and property, especially at 
  Archibald Wash over Pierce Ferry Road where cars continue to be 
  stranded. Several other washes in the warned area are likely 
  seeing flooding impacts as 1 to 2 inches of rainfall occurred in 
  this area over the last several hours.

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

  SOURCE...Area observations and Flood Control Webcams

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

* Some locations that will experience flash flooding include...
  Dolan Springs, Pierce Ferry And Antares Roads, Packsaddle 
  Campground, Windy Point Campground and Chloride.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3545 11398 3531 11425 3568 11450 3589 11443
      3588 11409

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

$$

TB3

807 
WGUS75 KVEF 120036
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
536 PM PDT Thu Aug 11 2022

AZC015-120046-
/O.EXP.KVEF.FF.W.0131.000000T0000Z-220812T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
536 PM MST Thu Aug 11 2022

...FLASH FLOOD WARNING WILL EXPIRE AT 545 PM MST THIS AFTERNOON FOR 
WEST CENTRAL MOHAVE COUNTY...

Heavy rain has ended in the Archibald Wash, and new flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3545 11398 3531 11425 3568 11450 3589 11443
      3588 11409

$$

CM

Area Forecast Discussion
National Weather Service Las Vegas NV
1041 AM PDT Wed Aug 10 2022

.SYNOPSIS...Another afternoon of thunderstorms expected today across
the eastern half of the area, with more isolated coverage in our
western locations. Heavy rain and flash flooding are the main
concerns. Storm chances and near-to-below normal temperatures stick
around into next week.
&&

.UPDATE...Mesoanalysis through the morning showed highly anomalous
moisture with an inch of higher PWATS and dewpoints over 60F in
place over much of southern Nevada through the Colorado River Valley
into western Arizona. In fact, the 12Z VEF sounding had recording
breaking PWATs of 1.7 inches (with the previously highest recorded
PWAT for today being 1.54 inches. Satelite imagery showed an area
of clouds associated with weak MCV lifting north into central
Nevada. By late morning, much of the region has at least some sun
to help heat the low levels. With a juicy atmosphere and surface
based CAPEs uncapped with values over 1000 J/Kg, we already have
isolated thunderstorms developing in the mountain area of Clark,
Lincoln, and Mohave County. High rain rates were already reported
with these storms.

Expectations for today have not changed much since the previous
forecast. Expecting convection late this morning through the
afternoon before diminishing this evening. Given the amount of
moisture, any storms will contain high rain rates and could lead to
flash flooding. The most widespread thunderstorm activity will be in
Lincoln, Clark, and Mohave counties this afternoon, thus the flash
flooding risk will be highest in these areas. Tall thunderstorms
with an uncapped atmosphere and progged ML CAPE to be uncapped with
values 1000-2000 J/Kg this afternoon could lead to wet microbursts
and strong winds. However, there is limited shear and DCAPE, so the
threat for widespread severe hail and winds is low. Made no changes
to the Flash Flood Watch that continues through this evening for
much of southern Nevada, western Arizona, and eastern San
Bernardino.
--Nickerson--
&&

.PREVIOUS DISCUSSION...203 AM PDT Wed Aug 10 2022
.SHORT TERM...Today and Thursday.

Overnight radar and satellite analysis shows scattered light showers
and a few thunderstorms across our central and northeastern zones.
These are likely being forced by remnant mesoscale perturbations
produced by yesterday's convection. This activity should continue to
drift northward with the mean upper-level flow, so a brief shower or
storm will be possible, mainly in our Nevada zones, through the
early morning.

The main thunderstorm activity will be this afternoon and evening,
across many of the same areas that were impacted yesterday. As a
result, the Flash Flood Watch was extended through midnight tonight.
The upper-level support for today is expected to arrive in the form
of an MCV produced by the ongoing convection in southern Arizona.
Not sure that guidance has a good grasp on this feature yet, it
looks like it'll arrive this afternoon or evening, providing lift
for thunderstorm development in additional to the usual orographic
component. Thus, scattered to widespread storms are forecast this
afternoon, primarily across Clark, Mohave, Lincoln, and northeastern
San Bernardino Counties. Primary concerns are heavy rain and flash
flooding, especially with PWATs of 1.5+ inches. However, gusty
outflow winds and frequent lightning will also be possible.
Thunderstorm activity should begin to wane in the evening hours.

Looking ahead to tomorrow, it's basically rinse and repeat. Deep
moisture stays in place and there remains no sign of larger-scale
features in the flow, so thunderstorm coverage will continue to rely
on mesoscale triggers from the previous day's convection. Heavy rain
and flash flooding potential will persist, primarily in Mohave,
Clark, and Lincoln Counties, but uncertainty remains in the
magnitude of these threats due to the aforementioned setup.

.LONG TERM...Friday through next week.

There is no sign of a pattern change in the extended forecast.
Ensemble guidance continues to show a dominant 500mb high over the
Four Corners/Southern Rockies region. This keeps us under south-
southeasterly flow which supplies the monsoon moisture. GFS and
ECMWF ensemble means show PWATs at or above 1.25" through next week.
Thus, above-normal rain chances and seasonal temperatures are
expected to persist through the period.
&&

.AVIATION...For Harry Reid...A moist southeasterly flow will
continue to bring abundant cloud cover across southern Nevada.
Easterly winds will diminish, becoming light and variable. SCT-BKN
clouds 15-20k feet lowering to 10-15k feet this afternoon.
Thunderstorm chances increase this afternoon with storm motion from
the southeast to the northwest. Possible impacts include brief heavy
rain, gusty outflow winds, and lightning. Storms are expected to
dissipate by sunset.

For the rest of southern Nevada, northwest Arizona and southeast
California...Isolated to scattered thunderstorms are expected to
develop this afternoon in the Las Vegas Valley and in the Colorado
River Valley impacting TAF sites with brief heavy rain, gusty
outflow winds, and dangerous lightning. Storm movement today will be
towards the north-northwest. Cloud bases 10-12 kft MSL. Low storm
chances at KBIH and KDAG today but an isolated cell or two
developing is not out of the question.
&&

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

DISCUSSION...Woods
AVIATION...Salmen

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