Flash Flood Warning 93, NWS Las Vegas, NV

039 
WGUS75 KVEF 012214
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
314 PM PDT WED AUG 1 2018

CAC027-020030-
/O.CON.KVEF.FF.W.0093.000000T0000Z-180802T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inyo CA-
314 PM PDT WED AUG 1 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM PDT FOR
NORTHERN INYO COUNTY...

At 311 PM PDT, California Highway Patrol reported flash flooding in 
the White Mountains west of Westgard Pass on HWY 168. HWY 168 has 
been closed and is impassable. 

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 3738 11803 3726 11803 3724 11816 3738 11822

$$

Boothe

478 
WGUS75 KVEF 012316
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
416 PM PDT WED AUG 1 2018

CAC027-020030-
/O.CON.KVEF.FF.W.0093.000000T0000Z-180802T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inyo CA-
416 PM PDT WED AUG 1 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM PDT FOR
NORTHERN INYO COUNTY...

At 414 PM PDT, Doppler radar indicated heavy rain was tapering off 
on Highway 168 west of Westgard Pass. The California Highway Patrol 
reported that the highway was closed from Death Valley Road to 
Highway 266 due to flash flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3738 11803 3726 11803 3724 11816 3738 11822

$$

Morgan

802 
WGUS75 KVEF 020022
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
522 PM PDT WED AUG 1 2018

CAC027-020031-
/O.EXP.KVEF.FF.W.0093.000000T0000Z-180802T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inyo CA-
522 PM PDT WED AUG 1 2018

...THE FLASH FLOOD WARNING FOR NORTHERN INYO COUNTY WILL EXPIRE AT
530 PM PDT...

The heavy rain has ended over Highway 168 west of Westgard Pass. 
Please continue to heed any remaining road closures.

LAT...LON 3738 11803 3726 11803 3724 11816 3738 11822

$$

Morgan

Area Forecast Discussion
National Weather Service Las Vegas NV
157 PM PDT Wed Aug 1 2018

.SYNOPSIS...
Another day or two of isolated to scattered showers and
thunderstorms will be possible before rain chances begin to
diminish moving into late week and into the weekend. Temperatures
will drop a few degrees relative to the last several days with a
drier pattern expected moving into next week.

&&

.SHORT TERM...Tonight through Saturday night.

Beginning to see some convection occuring over the Sierra Nevada
Mountains this afternoon in addition to a few isolated cells
southwest of Rachel and near Mount Trumbull. HREF/HRRR solutions
diminish the activity over the Sierra Nevada by around 03-04Z but
hangs on to isolated activity in Mohave county a little longer.
PWAT values between 1.1 to 1.2 inches have been noted in RAP
mesoanalysis in this area with increasing DCAPE values as you
approach the Mohave/Clark County borders a bit farther west of
the current convection. This will likely be the area of highest
concern through the rest of the afternoon and evening due the
better potential for strong outflow winds and heavy downpours. All
activity subsides according to these hi-res solutions after 06Z,
thus have decreased PoPs substantially at that point.

An H5 shortwave from the Pacific Northwest will begin to push
this stubborn ridge eastward Thursday which will begin the
downtrend of precip chances moving into the weekend. During this
evolution Thursday and Thursday evening, mid level convergence and
modest upper level effects appear to phase, especially in the 12Z
GFS20 which could be the trigger for the last significant round of
precip Thursday afternoon and evening beginning first over the
Sierra Nevada and traversing the northern periphery of the CWA
including Esmeralda, Nye, and Lincoln Counties. As this feature
shifts eastward moving into Friday morning, drier air will
dominate the region and PoP chances dwindle moving into the
weekend.

&&

.LONG TERM...Sunday through Tuesday

A short period of H5 zonal flow will occur throughout the
southwest CONUS and a large, broad closed low approaches the
western seaboard by Sunday night. It does appear in the 12Z long
range models however that ridging will recover by mid-week and not
back down to this Pacific low. There is still some model
disagreement on the magnitude and orientation of the rebuilding
ridge axis, with the GFS much more amplified whereas the
Canadian/ECWMF are more broad. This may have some implications on
the possibility for moisture to return to the area and thus PoP
chances for the latter half of the week. At this time, opted for
the Canadian/ECWMF solutions which are the drier options.

Either way, the return of the ridge would likely kick high
temperatures up again a few degrees ending the slightly cooler
temperatures expected this weekend and early next week.

&&

.AVIATION...For McCarran...South winds, with gusts up to 20 knots,
will be likely this afternoon. The only complication to the wind
forecast will be outflow from thunderstorms that develop south and
west of the terminal. There is a slight chance of thunderstorms
developing in the valley this afternoon. Without influence from
convection, winds will remain south to southwesterly through the
evening and gusts will wane after sunset. A drying pattern will
limit thunderstorm activity Thursday and through at least Monday.
Gusty south winds are anticipated Thursday with speeds between 10-20
knots.

For the rest of southern Nevada, northwest Arizona and southeast
California...Scattered to isolated thunderstorms possible in the
Spring Mountains, Las Vegas valley, south Sierra, central Nevada,
and northwest Arizona this afternoon and evening. Erratic, sudden,
gusty outflows will be possible with thunderstorms. Best chances for
thunderstorm development will be in KBIH today.

Outside of thunderstorm influence, gusty south winds between 10-20
knots will be favored. Thursday, thunderstorms will be isolated to
central Nevada, northwest Arizona and the Sierra. Elsewhere, dry
conditions with gusty southerly winds, with speeds similar to
Wednesday, are expected.

SHORT TERM...Boucher
AVIATION...Boothe
LONG TERM...Boucher

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