Flash Flood Warning 55, NWS Las Vegas, NV

745 
WGUS75 KVEF 201156
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
356 AM PST Wed Nov 20 2019

AZC015-CAC071-NVC003-201330-
/O.CON.KVEF.FF.W.0055.000000T0000Z-191120T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-San Bernardino CA-Clark NV-
356 AM PST Wed Nov 20 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM PST/630 AM
MST/ FOR SOUTHWESTERN MOHAVE...NORTHEASTERN SAN BERNARDINO AND SOUTH
CENTRAL CLARK COUNTIES...

At 351 AM PST/451 AM MST/, Radar indicates an area of moderate to 
heavy rainfall across Highway 93 from Dolan Springs to Arizona State 
Route 68. Additional rainfall amounts between one half inch and an 
one inch are possible in this area.

* Some locations that will experience flooding include...
  Bullhead City, Laughlin, Golden Valley, Willow Beach Campground, 
  Yucca, Searchlight, Katherine Landing, Needles, Oatman, Mojave 
  Ranch Estates, Pierce Ferry And Antares Roads, and Chloride.


This includes the following highways...
 Interstate 40 in Arizona between mile markers 22 and 40.
 Interstate 40 in California between mile markers 88 and 147.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3551 11414 3481 11411 3472 11554 3574 11531
      3593 11516 3591 11402

$$

Boothe

351 
WGUS75 KVEF 201219
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
419 AM PST Wed Nov 20 2019

AZC015-CAC071-NVC003-201330-
/O.CON.KVEF.FF.W.0055.000000T0000Z-191120T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-San Bernardino CA-Clark NV-
419 AM PST Wed Nov 20 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM PST/630 AM
MST/ FOR SOUTHWESTERN MOHAVE...NORTHEASTERN SAN BERNARDINO AND SOUTH
CENTRAL CLARK COUNTIES...

At 415 AM PST/515 AM MST/, Mohave County Public Works reported flash 
flooding in at Estrella Road in Golden Valley.

Other locations that will experience flooding include... Bullhead 
City, Laughlin, Willow Beach Campground, Yucca, Searchlight, 
Katherine Landing, Needles, Oatman, Mojave Ranch Estates, Pierce 
Ferry And Antares Roads, and Chloride.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3551 11414 3481 11411 3472 11554 3574 11531
      3593 11516 3591 11402

$$

Boothe

123 
WGUS75 KVEF 201326
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
526 AM PST Wed Nov 20 2019

AZC015-CAC071-NVC003-201335-
/O.EXP.KVEF.FF.W.0055.000000T0000Z-191120T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-San Bernardino CA-Clark NV-
526 AM PST Wed Nov 20 2019

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN MOHAVE...NORTHEASTERN SAN
BERNARDINO AND SOUTH CENTRAL CLARK COUNTIES WILL EXPIRE AT 530 AM
PST/630 AM MST/...

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

LAT...LON 3551 11414 3481 11411 3472 11554 3574 11531
      3593 11516 3591 11402

$$

Boothe

Area Forecast Discussion
National Weather Service Las Vegas NV
810 PM PST Tue Nov 19 2019

.SYNOPSIS...Two storm systems will bring widespread rain and the
first significant snowfall of the season above 6000 feet through
midweek. The best chances for heavy precipitation will be tonight
through Wednesday, with showers lingering through Thursday, before
dry weather returns Friday through the weekend. Temperatures will be
10 to 20 degrees cooler Wednesday and Thursday, with very slow
recovery expected over the weekend.
&&

.UPDATE...Heavy precipitation event just beginning across the region
this evening ans highly anomalous atmospheric moisture content
combines with an incoming closed low. Heaviest precipitation
continues to be favored across Northwest Arizona and the Colorado
River Valley, where widespread rainfall totals of 1-2 inches are
possible. In fact, localized pockets of training thunderstorms may
result in very isolated totals exceeding 3 inches.  Flash flooding
will remain a concern overnight as this system unfolds.

Further west, light showers have begun to break out near Las Vegas
and expect this trend to continue overnight, though rainfall totals
exceeding a tenth of an inch in Las Vegas overnight are looking less
likely.  Additional rainfall with greater precipitation accumulation
will probably hold off in Vegas until tomorrow morning.

Overall, the forecast remains in good shape. However, I did update
the grids to boost PoPs to near 100 percent for areas where rain is
ongoing. Also skewed PoPs downward through the early morning hours
across our far western zones near Death Valley and the Owens Valley
where dry conditions will hold on until stronger forcing arrives
during the early morning hours.

-Outler-

&&

.AVIATION...For McCarran...Breezy winds have persisted through the
evening hours, with winds becoming more south to southeast as rain
creeps closer to the Valley. Gusts have generally been 20 to 25kts,
and expect that to continue through about midnight before winds drop
back to around 10kts with gusts ending. Low confidence that gusts
will become more intense at times the next few hours ahead of the
main precipitation, as isolated observations have reported sudden
gusts 35 to 45kts due to virga. Continuing to watch rain move north
and west towards the area. Current timing in the TAF looks good,
with rain moving in after 06Z. Light to occasionally moderate rain
is possible through the night at times. Ceilings may drop lower than
current forecast, with BKN 3-5kft possible with any heavier
precipitation. However, the better chance for low ceilings would be
Wednesday afternoon and confidence is low in any clouds lower than
5000ft at this time.

For the rest of southern Nevada, northwest Arizona and southeast
California...A broad area of rain with isolated embedded
thunderstorms has pushed into the Colorado River Valley through
southern NV into NW AZ this evening. MVFR ceilings and occasional
moderate rain has been reported with this precipitation.
Precipitation is expected to continue through the night over this
area, with heavy rain possible and ceilings below 5000ft possible at
times at IFP and EED. AT DAG, scattered showers are possible at
times through the night but should not be as intense or widespread
at areas further east. Elsewhere, precipitation will be slow to fill
in, and should take most of the night for showers to develop. South
to southeast winds will continue through the first half of tonight,
with widespread gusts 20 to 30kts. Winds should diminish after
midnight and would remain around 10kts

&&

.SHORT TERM...through Thursday night. Things are finally underway
this afternoon. Satellite loop showed the cutoff upper low west of
the Baja slowly beginning to move northeast under the influence of
the northern stream low center which was near San Francisco and
moving south. Ahead of the cutoff low, moisture from the remnants of
Tropical Storm Raymond was streaming north over Arizona and southern
California, with radar returns slowly increasing and expanding this
afternoon, along with isolated lightning flashes and strikes. High
resolution models still show some instability from the Colorado
River Valley eastward through midnight, which would support at least
spotty thunderstorms until the air column saturates and wipes out
the instability. As has been noted for days, the biggest concern has
been the sharp gradient in precip amounts from northwest to
southeast. The main change in the models this morning has been to
shift and tighten this gradient somewhat, with heavier amounts up to
three inches now in southern and eastern Mohave County and a very
sharp gradient from one to three inches along the Colorado River
Valley to less than half an inch near Amboy. The Flash Flood Watch
for Mohave County and adjacent areas of Clark and San Bernardino
still looks good, as does the Winter Storm Warning for the Clark
County mountains. The models have pulled higher precip amounts a bit
farther west into Lincoln County, which poses two problems - one,
whether to expand the Flash Flood Watch there, and two, whether to
add a Winter Storm Warning for the higher elevations above most of
the towns. At this time, will hold off on that, but will brief the
next shift to keep an eye on the precip trends in that area. Still
concerned that the Sierra and White Mountains of Inyo County may not
get as much snow as previously expected due to the slightly faster
speed/shorter duration of the storm, but will leave the Warning in
place so that anyone who has been enjoying the sunny and
unseasonably warm weather up there can be aware of the sudden
change. Still expecting the highest precip intensity to be over by
Thursday morning, followed by chances tapering off from west to east
during the day and evening.

.LONG TERM...Friday through next Tuesday.
As models work to resolve the exit of the significant weather system
mentioned in the above discussion, agreement continues to increase
regarding a follow-up closed low pressure system forming down the
California Coast on Friday. This low pressure system shouldn't cause
much in the way of impacts for our area and we can expect a weekend
with clear skies, dry conditions and seasonal temperatures.
However, the location of the aforementioned low will help determine
the exact position of the dominant northwesterly pattern that will
set up going into the work week. Through the day on Monday, a
shortwave disturbance is expected to slide down this northwesterly
flow toward our area. The deterministic GFS solution indicates this
disturbance pushing directly through the northern portions of our
forecast area bringing gusty northerly winds through the day on
Monday - a forecast our local models are suggesting. Conversely, the
deterministic ECMWF indicates this disturbance remaining north of
our area with a marginal increase in northerly winds - a resolution
that both the NBM and ECMWF ensemble members are reflecting. As a
result, low confidence at this time with regard to details, but an
uptick in northerly winds can be expected going into the next work
week. Regardless, the approach of this shortwave disturbance could
drop temperatures to below-average as we approach Thanksgiving.
&&

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures. The main concerns will be heavy rain and flash flooding
in Mohave County tonight and Wednesday, and heavy snow in the
mountains of Inyo and Clark counties through Thursday.
&&

SHORT TERM...Morgan
LONG TERM/AVIATION...Varian/Wolf

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1006 PM PST TUE NOV 19 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0944 PM     FLASH FLOOD      7 NW VIDAL JUNCTION     34.27N 114.65W
11/19/2019                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            CHP REPORTS NUMEROUS AMOUNTS OF DEBRIS AND
            WATER CROSSING ROADWAY ALONG US95 NORTH OF
            VIDAL JUNCTION.

&&

CO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1100 PM PST TUE NOV 19 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1058 PM     FLASH FLOOD      1 WSW VIDAL JUNCTION    34.19N 114.58W
11/19/2019                   SAN BERNARDINO     CA   DEPT OF HIGHWAYS

            HIGHWAY 62 CLOSED DUE TO FLOODING. REPORTED
            VIA TWEET FROM CALTRANS DISTRICT 8.

&&

CO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1105 PM PST TUE NOV 19 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1052 PM     FLASH FLOOD      10 W RICE               34.10N 115.03W
11/19/2019                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            CHP REPORTS VEHICLE STRANDED IN THE MIDDLE
            OF FLOODED ROADWAY.

&&

CO