Flash Flood Warning 42, NWS Las Vegas, NV

456 
WGUS75 KVEF 232141
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
241 PM PDT Sat Aug 23 2025

CAC071-232315-
/O.CON.KVEF.FF.W.0042.000000T0000Z-250823T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
241 PM PDT Sat Aug 23 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT THIS 
AFTERNOON FOR SAN BERNARDINO COUNTY...

At 241 PM PDT, Doppler radar indicated thunderstorms producing heavy 
rain across 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...
  Cima and Cima Rd.

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 3519 11549 3527 11561 3542 11571 3544 11566
      3546 11559 3544 11552 3535 11541 3527 11542

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

$$

AN

652 
WGUS75 KVEF 232307
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
407 PM PDT Sat Aug 23 2025

CAC071-232317-
/O.EXP.KVEF.FF.W.0042.000000T0000Z-250823T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
407 PM PDT Sat Aug 23 2025

...FLASH FLOOD WARNING WILL EXPIRE AT 415 PM PDT THIS AFTERNOON FOR 
SAN BERNARDINO COUNTY...

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

&&

LAT...LON 3519 11549 3527 11561 3542 11571 3544 11566
      3546 11559 3544 11552 3535 11541 3527 11542

$$

MW

Area Forecast Discussion
National Weather Service Las Vegas NV
1100 AM PDT Sat Aug 23 2025

.KEY MESSAGES...

* The Extreme Heat Warnings and Heat Advisories will continue
  through this evening with temperatures cooling as we head into
  next week.

* Similar to Friday, lingering cloud cover will limit instability
  across the central portion of our forecast area with convective
  development favoring the fringes of our forecast area.

* Chances for showers and thunderstorms will continue into next
  week.

&&

.DISCUSSION...through Friday.

Low temperatures this morning will be around 6 to 12 degrees warmer
than normal, which will help to keep HeatRisk elevated despite the
slight decrease in forecast afternoon high temperatures. As such,
the Extreme Heat Warnings and Heat Advisories look good to remain in
effect through later this evening. Temperatures will continue to
cool as we head into next week, dropping below normal beginning
Monday and Tuesday. Once they return, these cooler than normal
temperatures will continue through the end of the week.

Similar to yesterday, cloud cover from debris clouds from storms in
Arizona will limit instability across the central portions of our
forecast area. Current infrared and water vapor satellite imagery
show these debris clouds from earlier convection currently
working their way through our forecast area with additional clouds
beginning to push in from the south. It is these additional
clouds that will limit daytime heating, therefore decreasing
instability this afternoon. Convection is expected to initiate
along the fringes of our forecast area where daytime heating will
be maximized. Showers and thunderstorms will initially favor
higher terrain with additional development possible across lower
elevations as outflow boundaries move through. Strong outflow
winds, moderate-to-heavy rain, flash flooding, and frequent
lightning will be possible with any storms that develop. Outflow
winds from distant storms will have the potential to impact area
lakes, resulting in choppy waves and hazardous boating conditions.
Stronger, more robust storms across the southeastern portions of
our forecast area will be capable of 1 inch per hour rain rates or
greater.

Conditions look better on Sunday in terms of more widespread
convection across the area as HiRes models do not show debris clouds
moving through overnight and limiting instability during the day.
Chances for showers and thunderstorms will continue into next week
as moisture lingers across the region. Hazards will remain the same
with strong outflow winds, heavy rain, flash flooding, and frequent
lightning possible with any storms that develop over the weekend.
Around mid-week a weak shortwave trough will approach the coast of
California, with the potential to result in more widespread showers
and thunderstorms as lift from this trough overlaps with the
presence of monsoonal moisture. However, at this point, there
remains a wide envelope of possibilities when it comes to what
exactly we could see due to interensemble variability regarding the
evolution of this system.

&&

.AVIATION...For Harry Reid...For the 18Z Forecast Package...Lots of
debris clouds continue to pass through the area this morning, which
will inhibit heating and likely delay the threat of thunderstorms
through early afternoon. Storms could still develop over the
mountains early this afternoon, but the better chances for anything
to affect the terminal should hold off until late afternoon (if it
occurs at all). The main concern with any nearby storms will be
erratic gusty winds, with a lower (but not zero) chance of brief
heavy rain and lower ceilings. A few light showers could persist
into the night. Storms are expected to develop on the mountains
again around midday Sunday. Much lower confidence in the temperature
forecast due to the cloud cover. The best chances for exceeding 100F
will come between 18Z and 04Z.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 18Z Forecast Package...Main area of convection
this morning remains over western Inyo County along the 395 corridor
and along the Sierra Crest. Storms this morning have been increasing
in coverage and it's likely that development will continue through
the afternoon. Some heavy rain, gusty outflow winds, and frequent
lightning will be a concern. Other areas of Inyo County will also
see areas of scattered thunderstorms through the afternoon. For the
remainder of the area, still seeing some debris clouds over the area
which will inhibit development for a little while, but by the
afternoon we should see areas of isolated to scattered thunderstorms
over most areas. The main threats with storms will be erratic gusty
winds, locally heavy rain, and low ceilings with terrain
obscuration. The threat of afternoon showers and thunderstorms will
continue across the region each day through at least Tuesday.
However, Tuesday and Wednesday have been consistently showing the
potential to be the most impactful days of next week in terms of
weather.

&&

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

&&

DISCUSSION...Stessman
AVIATION...Gorelow

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