Flash Flood Warning 24, NWS Las Vegas, NV

292 
WGUS75 KVEF 130058
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
558 PM PDT Wed Aug 12 2026

AZC015-CAC071-130300-
/O.CON.KVEF.FF.W.0024.000000T0000Z-260813T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-San Bernardino CA-
558 PM PDT Wed Aug 12 2026 /558 PM MST Wed Aug 12 2026/

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM PDT /8 PM MST/
THIS EVENING FOR SOUTHWESTERN MOHAVE AND SAN BERNARDINO COUNTIES...

At 558 PM PDT /558 PM MST/, Doppler radar indicated thunderstorms
producing heavy rain across the warned area. Additional rainfall
amounts up to 1 inch are possible in the warned area. Flash flooding
is ongoing or expected to begin shortly.

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

SOURCE...Radar indicated.

IMPACT...Life threatening flash flooding of creeks and streams, urban
         areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Lake Havasu City, Parker Dam, Topock, Highway 95 At Mile Marker 29,
  Alamo Lake, Three Dunes Campground, Cattail Cove State Park, Black
  Meadow Landing Campground, Desert Hills, Earp, Big River, Vidal
  Junction and Burro Creek Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3468 11485 3475 11446 3486 11406 3449 11333
      3432 11333 3429 11337 3431 11353 3423 11360
      3421 11368 3424 11373 3422 11384 3425 11386
      3425 11401 3430 11413 3426 11413 3426 11417
      3419 11423 3411 11442 3408 11444 3408 11478

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

$$

JCS

599 
WGUS75 KVEF 130301
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
801 PM PDT Wed Aug 12 2026

AZC015-CAC071-130311-
/O.EXP.KVEF.FF.W.0024.000000T0000Z-260813T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-San Bernardino CA-
801 PM PDT Wed Aug 12 2026 /801 PM MST Wed Aug 12 2026/

...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHWESTERN MOHAVE AND SAN
BERNARDINO COUNTIES...

Flood waters have receded. Please continue to heed remaining road
closures. Another Flash Flood Warning is replacing portions of this
warning.

A Flood Watch remains in effect until 1200 AM PDT /1200 AM MST/ for a
portion of northwest Arizona.

&&

LAT...LON 3468 11485 3475 11446 3486 11406 3449 11333
      3432 11333 3429 11337 3431 11353 3423 11360
      3421 11368 3424 11373 3422 11384 3425 11386
      3425 11401 3430 11413 3426 11413 3426 11417
      3419 11423 3411 11442 3408 11444 3408 11478

$$

JP

Area Forecast Discussion
National Weather Service Las Vegas NV
303 PM PDT Wed Aug 12 2026

.KEY MESSAGES...

* This afternoon offers widespread chances for storms with an
  increased risk for flooding in Mohave County AZ, with a Flash
  Flood Watch issued from noon through midnight.

* Daily afternoon to evening isolated thunderstorm chances will
  continue through the late week, with the greatest chances over
  higher terrain and some storms spreading into adjacent valleys.

&&

.DISCUSSION...Through Tuesday.

Today is shaping up to be one of the most active monsoon days of
the season thus far. Latest SPC mesoanalysis shows the 1" PWAT
contour extending all the way up into the southern Great Basin.
With mostly sunny skies west of the Colorado River and a subtle
trough approaching off the Pacific, all the ingredients are there
for scattered storms across the area. Main concerns will be flash
flooding and gusty outflow winds. Morning convection in central
Mohave County produced impressive rain rates/totals, but will
likely limit (or at least delay) additional activity in this area
as the atmosphere has been worked over. This could set up an
instability gradient for afternoon storms to run along, pushing
them down the lower Colorado River Valley. SPC has highlighted
this area with a marginal risk of severe winds. Activity may
linger in the southern Great Basin and lower Colorado River Valley
this evening, but things should largely be on the downtrend
around sunset.

Tomorrow, the trough moves a bit closer and flow aloft
strengthens. This will speed up storm movement, reducing the
risk of flash flooding outside of training storms. However, this
stronger flow aloft will also produce an uptick in vertical wind
shear, potentially allowing for more organized convection. This
signal is most clear in the southern Great Basin where the latest
HREF indicates 70-90% probabilities of 30+ knot thunderstorm winds
and a 10-20% chance of 50+ knots. Wouldn't rule out the potential
for hail as well thanks to modestly rotating updrafts depicted in
some CAMs. Storm coverage across the Mojave Desert should be more
isolated in nature on Thursday. On Friday, the southwesterly flow
pushes moisture mainly into southeastern NV and northwestern AZ,
where isolated to scattered convection is yet again possible in
the afternoon hours. Drier conditions with just isolated activity
possible over the weekend.

&&

.AVIATION...For Harry Reid...For the 18Z Forecast Package...Light
and variable winds becoming southerly by late morning. Convection is
expected to develop Wednesday afternoon with more coverage than
previous days. 30%-40% chance of thunderstorms at the terminals
which could result in brief heavy rain, visibility under 5SM, sudden
gusty winds, and CIGs below 8000ft. Outside of convection, south to
southeast winds around 12KT with occasional gusts over 20KT are
expected. Light and variable winds will develop toward sunset. VFR
conditions with SCT-BKN clouds over 10kft are expected overnight. A
20-30% chance of thunderstorms on Thursday afternoon with similar
CIGs and VSBYs.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 18Z Forecast Package...The initial round of
showers and thunderstorms may shift in eastern Mohave County will
diminish by early afternoon. Convection will develop again Wednesday
afternoon across much of the region. Any storms could produce
lightning, heavy rain, sudden gusty winds, and CIGs below 8000ft.
Outside of convective influences, south to southwest winds around 10-
15KT will develop Wednesday afternoon. Wind and convection will
diminish after sunset Wednesday. Although coverage will be less,
thunderstorms will develop again on Thursday afternoon.

&&

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

&&

DISCUSSION...Woods
AVIATION...Czyzyk

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
341 PM PDT Wed Aug 12 2026

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

0203 PM     Tstm Wnd Gst     Nellis AFB              36.23N 115.03W
08/12/2026  M71 MPH          Clark              NV   ASOS

            KLSV reported a peak wind of 71 MPH.

&&

AN