Flash Flood Warning 14, NWS Las Vegas, NV

005 
WGUS75 KVEF 220310
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
810 PM PDT Sun May 21 2023

CAC071-220400-
/O.CON.KVEF.FF.W.0014.000000T0000Z-230522T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
810 PM PDT Sun May 21 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING 
FOR SOUTHERN SAN BERNARDINO COUNTY...

At 810 PM PDT, CHP reported roadway flooding near Morongo Road and 
Ball road due to earlier heavy rainfall. Flash flooding is ongoing.

HAZARD...Life-threatening flash flooding.

SOURCE...Law enforcement reported.

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

Some locations that will experience flash flooding include...
  Twentynine Palms, Twentynine Palms Base, SR 62 east of TWentynine 
  Palms.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3447 11633 3435 11598 3409 11554 3407 11555
      3409 11560 3404 11560 3403 11600 3408 11600
      3408 11604 3411 11604 3411 11605 3412 11605
      3412 11626 3408 11626 3408 11644 3406 11645
      3415 11647 3421 11644 3426 11644 3429 11646

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JA

593 
WGUS75 KVEF 220359
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
859 PM PDT Sun May 21 2023

CAC071-220409-
/O.EXP.KVEF.FF.W.0014.000000T0000Z-230522T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
859 PM PDT Sun May 21 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 9 PM PDT THIS EVENING FOR 
SOUTHERN SAN BERNARDINO COUNTY...

Flood waters have receded around Twentynine Palms. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3447 11633 3435 11598 3409 11554 3407 11555
      3409 11560 3404 11560 3403 11600 3408 11600
      3408 11604 3411 11604 3411 11605 3412 11605
      3412 11626 3408 11626 3408 11644 3406 11645
      3415 11647 3421 11644 3426 11644 3429 11646

$$

JA

Area Forecast Discussion
National Weather Service Las Vegas NV
139 PM PDT Sun May 21 2023

.SYNOPSIS...Scattered showers and thunderstorms continue into
Monday across much of Inyo County and southcentral Nevada before
a drier pattern brings an end to precipitation chances by
Wednesday. A low pressure system will bring windy conditions to
the area on Tuesday with stronger winds possible on Wednesday.
Initially, this troughing will lead to a small increase in
temperatures on Tuesday but then cooler conditions as high
temperatures settle back to more seasonal levels late in the
week.

&&

.DISCUSSION...Monday through Wednesday.

A low pressure system over Washington State on Monday is expected
to have little impact on our area directly. A upper level
disturbance forecast to be west of our area early Monday moves
east to the Nevada/California border near Bishop in the afternoon.
This feature provides a lifting mechanism for, what is still,
anomalous moisture across Inyo County and areas to the east
across southcentral Nevada. Shower and thunderstorm coverage is
expected in this region on Monday with a lingering storm or two
possible over the Spring Mountains. More widespread shower and
thunderstorm activity is forecast within an area of difluent flow
aloft over northern Lincoln County.

On Tuesday, a more pronounced trough moves into central California
in the afternoon bringing increasing winds to our area and
bumping up temperatures a degree or two. It will also further
scour out moisture and limit shower chances to the northern
fringes of the CWA. We are still looking for windy conditions on
Tuesday with widespread gusts of 20-30 mph and more localized
areas of gusts 30-40 mph during the day. Currently, not seeing
any need for wind headlines on Tuesday. For Wednesday, shower
chances are mainly north of our area however, northern Lincoln
County lies within the exit region of a 50 knot jet associated
with troughing over the southwest. This could aid in the
development of a few showers before all is said and done. Winds on
Wednesday actually look stronger than Tuesday now with fairly
widespread gusts of 30-40 mph. Still subadvisory at this point.

Thursday through Sunday...low pressure is forecast to linger over
the area through at least Friday before filling and weakening
heading into the weekend. However, the extended period is really
up in the air regarding possible weather conditions with stark
differences in the various ensemble system 500 mb height forecasts.

&&

.AVIATION...For Harry Reid...Once again very similar conditions to
yesterday. An easterly wind less than 10 kts will be favored through
much of the afternoon with storms developing over the mountains
north and west of the valley. Best time for minor to moderate
impacts at the terminal from thunderstorms and resultant outflow
gusts looks fall between 00Z-03Z. Guidance suggests strongest
outflow winds may come from the south with gusts up to 30kt.
Activity should dissipate around 03-04Z leading to mostly clear to
partly cloudy skies and winds less than 10 kts overnight into Monday
morning. Another day of thunderstorms forecast over the higher
terrain Monday with lower probability of outflow winds impacting the
valley in the late afternoon or early evening hours.

For the rest of southern Nevada, northwest Arizona and southeast
California...Isolated to scattered -TSRA expected across the region
this afternoon and evening, and again Monday. All regional terminals
can expect at least VCTS after 21Z both days, with possible outflow
impacts as well, with gusts up to 30-35 kts, possibly 40+ kts not
out of the question, but probability for that is low at any
terminal. Coverage should wane significantly by the late evening,
but wind direction confidence is very low due to remnant outflows
expected to be prominent across the region.

&&

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

&&

DISCUSSION...Salmen
AVIATION...Pierce

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
650 PM PDT SUN MAY 21 2023

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

0543 PM     FLASH FLOOD      8 NW TWENTYNINE PALMS   34.22N 116.15W
05/21/2023                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            CALIFORNIA HIGHWAY PATROL REPORTS THAT A
            VEHICLE IS STUCK IN A FLOODED ROADWAY. ROAD
            IS UNACCUSABLE DUE TO FLOODING.

0634 PM     FLASH FLOOD      7 NNW TWENTYNINE PALMS  34.23N 116.09W
05/21/2023                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            CALIFORNIA HIGHWAY PATROL REPORTS FLOODING
            RESULTING IN VEHICLES BEING WASHED AWAY.

&&

MS