Flash Flood Warning 6, NWS Las Vegas, NV

270 
WGUS75 KVEF 050530
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
1030 PM PDT Sun May 4 2025

CAC027-071-050730-
/O.CON.KVEF.FF.W.0006.000000T0000Z-250505T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inyo CA-San Bernardino CA-
1030 PM PDT Sun May 4 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM PDT MONDAY 
FOR SOUTH CENTRAL INYO AND SAN BERNARDINO COUNTIES...

At 1030 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...
  Homewood Canyon-Valley Wells, Trona and Searles Valley.

This includes State Route 178 in San Bernardino County between mile 
markers 1 and 14.

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 3585 11770 3625 11741 3632 11733 3633 11722
      3631 11710 3620 11706 3614 11707 3590 11714
      3580 11720 3559 11745 3552 11763 3564 11763
      3565 11762 3568 11762 3569 11765 3571 11765
      3571 11763 3580 11763 3580 11770

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

$$

Planz

865 
WGUS75 KVEF 050722
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
1222 AM PDT Mon May 5 2025

CAC027-071-050732-
/O.EXP.KVEF.FF.W.0006.000000T0000Z-250505T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inyo CA-San Bernardino CA-
1222 AM PDT Mon May 5 2025

...FLASH FLOOD WARNING WILL EXPIRE AT 1230 AM PDT EARLY THIS MORNING 
FOR SOUTH CENTRAL INYO AND SAN BERNARDINO COUNTIES...

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

&&

LAT...LON 3585 11770 3625 11741 3632 11733 3633 11722
      3631 11710 3620 11706 3614 11707 3590 11714
      3580 11720 3559 11745 3552 11763 3564 11763
      3565 11762 3568 11762 3569 11765 3571 11765
      3571 11763 3580 11763 3580 11770

$$

JP

Area Forecast Discussion
National Weather Service Las Vegas NV
637 PM PDT Sun May 4 2025

.SYNOPSIS...Showers, thunderstorms, and much cooler than normal
temperatures will persist through Monday for much of the area as a
strong storm system continues to impact the area. Beyond Monday,
we will see a drying and warming trend through the next week,
with temperatures well above normal by the end of the week.
&&

.UPDATE...In general, the HRRR performed well today regarding the
location of convection, but the intensity was overdone, compared to
what came to fruition. Anomalous moisture in the region allowed for
rain rates across south-central Mohave and San Bernardino counties
to peak between 0.25 and 0.35 inches per 15 minutes at times.
Earlier in the afternoon, storm motion was quick enough that flash
flooding was not expected. However, as the afternoon progressed -
particularly across our southern zones that are closer to the center
of the low - storm movement halted to 5 mph or slower, which
resulted in flash flooding along State Route 62 in southeastern San
Bernardino as well as along local roads west of Barstow. Forecast
HRRR reflectivity continues to highlight Inyo County for late-
afternoon into early-evening convection. The RAP is highlighting a
region of increased instability in southern Inyo County and northern
San Bernardino County over the next couple of hours with between 500
and 1000 J/kg of CAPE and 25-30 kts of bulk shear across an area
that has between 0.70 and 0.80 inches of untapped PWAT. This will be
our area of focus over the next few hours, as overall activity wanes
(but does not completely dissolve) overnight. Expect a return of
scattered showers and isolated thunderstorms on Monday, with a focus
across Mohave, Clark, and San Bernardino counties. No changes made
to the forecast this evening.

.PREVIOUS DISCUSSION...449 PM PDT Sun May 4 2025/

.SHORT TERM...Today through Monday Night.

The strong storm system, currently centered just south of Lake
Havasu City, continues to bring convective activity to much of the
region. In areas where clearing is occurring, mainly Mohave County,
we are seeing storms form in an increasingly unstable environment,
with CAPE values in the 1000-1500 J/kg range through early evening.
Storms will diminish in coverage and intensity after sunset.
However, dynamic forcing will be enough to keep scattered shower
activity going through the night in many areas. Convective activity
increases again Monday around sunrise for Clark and Lincoln counties
as well as the Colorado River and Mohave County. Much cooler than
normal temperatures will be the norm for today and tomorrow as we
reside on the cool side of the trough. Temperatures will run 10-15
degrees below-normal through Monday.

.LONG TERM...Tuesday through Saturday.

A period of quieter weather begins Tuesday as the strong trough of
low pressure that brought us all of the active weather these past few
days moves off to the east. A few showers could linger on Tuesday in
Mohave County. Subsequently, a building ridge will slingshot our
temperatures from well below normal to well above normal by the end
of the week. Ensembles are in remarkable agreement on temperatures
in Las Vegas reaching the mid-upper 90s by Saturday with a 10%
chance of reaching 100. No significant winds or precipitation are
expected beyond Tuesday.
&&

.AVIATION...For Harry Reid...For the 00Z Forecast Package...The
threat of showers and thunderstorms has diminished in the short term
across the valley, with only a slight chance for the remainder of
the evening.  The winds forecast has also been decreased for the
evening period, with speeds generally remaining less than 10 knots.
There is still a low chance of an outflow boundary from distant
storms moving into the valley through 06Z.  Additional storms are
possible tomorrow, with the best chances between 18Z and 00Z.  Away
from storms, winds are expected to remain below 10 knots. Skies will
be BKN to OVC through the TAF period with bases remaining 8kft to
10kft into tonight, falling to 5kft to 8kft tomorrow.

For the rest of southern Nevada, northwest Arizona and southeast
California...For the 00Z Forecast Package...The Las Vegas area TAF
will see conditions similar to those described for Harry Reid
through tomorrow.  Elsewhere, showers and thunderstorms will remain
the primary concern Monday for all area terminals except KBIH and
KDAG.   Winds at KBIH will be northerly with intermittent gustiness
through tomorrow.  At KDAG, gusty winds will persist through tonight
before decreasing tomorrow. Showers and embedded thunderstorms will
redevelop in the Lower Colorado River Valley tomorrow afternoon
after 19Z.  Most areas will see skies BKN to OVC through the TAF
period with bases remaining 8kft to 10kft into tonight, falling to
5kft to 8kft tomorrow.
&&

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

UPDATE...Soulat
DISCUSSION...Berc
AVIATION...Planz

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
520 PM PDT Sun May 4 2025

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

0316 PM     Flash Flood      15 W Rice               34.09N 115.10W
05/04/2025                   San Bernardino     CA   Law Enforcement

            Roadway flooding reported at State Route 62
            and Iron Mountain Pump Plant Road.

0444 PM     Flash Flood      Earp                    34.16N 114.30W
05/04/2025                   San Bernardino     CA   Law Enforcement

            Flash flooding reported at State Route 62 in
            Earp at Vandarke Road. Vehicle submerged in
            water.

0200 PM     Flash Flood      9 W Colorado City       37.00N 113.14W
05/04/2025                   Mohave             AZ   Trained Spotter

            Spotter reported water flowing over Highway
            91 just south of the Utah Arizona state
            line. Time of flooding onset estimated by
            radar.

0245 PM     Flash Flood      9 NE Dolan Springs      35.70N 114.17W
05/04/2025                   Mohave             AZ   County Official

            Flash flooding observed on a county webcam
            through Archibald Wash over Pierce Ferry
            Road.

&&

SOULAT