Alert archive / California / Flash Flood Warnings in 2024

Flash Flood Warning 26, NWS Las Vegas, NV

July 23, 2024San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 23, 2024, 12:04 AM PDT for San Bernardino County, California. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 23, 2024, 12:04 AM PDT (07:04 UTC)
Expired: Jul 23, 2024, 3:15 AM PDT
In force: 3 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County San Bernardino County, CA

The radar

The Las Vegas radar (KESX), 125 km from the middle of the area, began a volume at 07:07 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 00:00Z, 7.1 hours before the alert went out and 107 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 41 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 4017 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

227 
WGUS55 KVEF 230704
FFWVEF
CAC071-231015-
/O.NEW.KVEF.FF.W.0026.240723T0704Z-240723T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1204 AM PDT Tue Jul 23 2024

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  San Bernardino County in southern California...

* Until 315 AM PDT.

* At 1204 AM PDT, Doppler radar indicated thunderstorms producing 
  heavy rain on Highway 127 south of Dumont Dunes. 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...
  Highway 127 south of Dumont Dunes

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3557 11627 3568 11632 3569 11628 3557 11620

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

$$

CM

3 follow-up statements

383 
WGUS75 KVEF 230801
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
101 AM PDT Tue Jul 23 2024

CAC071-231015-
/O.CON.KVEF.FF.W.0026.000000T0000Z-240723T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
101 AM PDT Tue Jul 23 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM PDT EARLY THIS 
MORNING FOR SAN BERNARDINO COUNTY...

At 101 AM PDT, Doppler radar indicated rain tapering off over 
Highway 127 south of Dumont Dunes. Heavy rain has fallen in the area 
since midnight, and flooding of the highway is still a concern.

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...
  Highway 127 south of Dumont Dunes, between mile markers 23 and 34

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3557 11627 3568 11632 3569 11628 3557 11620

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

$$

CM

941 
WGUS75 KVEF 230904
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
204 AM PDT Tue Jul 23 2024

CAC071-231015-
/O.CON.KVEF.FF.W.0026.000000T0000Z-240723T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
204 AM PDT Tue Jul 23 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM PDT EARLY THIS 
MORNING FOR SAN BERNARDINO COUNTY...

At 204 AM PDT, Doppler radar indicated rain ending on Highway 127 
between mile markers 23 and 34, south of Dumont Dunes. However, 
heavy rain has fallen into washes which flow over the highway, so 
flash flooding is still a concern.

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...
  Highway 127 south of Dumont Dunes, between mile markers 23 and 34

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3557 11627 3568 11632 3569 11628 3557 11620

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

$$

CM

422 
WGUS75 KVEF 231006
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
306 AM PDT Tue Jul 23 2024

CAC071-231016-
/O.EXP.KVEF.FF.W.0026.000000T0000Z-240723T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
306 AM PDT Tue Jul 23 2024

...FLASH FLOOD WARNING WILL EXPIRE AT 315 AM PDT EARLY THIS MORNING 
FOR SAN BERNARDINO COUNTY...

Rain had ended on Highway 127 just south of Dumont Dunes Road. At 
207 AM PDT, the California Highway Patrol reported debris all over 
the road due to flash flooding. Please continue to heed remaining 
road closures.

&&

LAT...LON 3557 11627 3568 11632 3569 11628 3557 11620

$$

CM

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood warning went out at Jul 22, 2:29 PM PDT, 9 hours 35 minutes earlier.

Area forecast discussion, Jul 22, 2:29 PM PDT, 9 hours 35 minutes before

Area Forecast Discussion
National Weather Service Las Vegas NV
229 PM PDT Mon Jul 22 2024

.SYNOPSIS...Monsoonal moisture will continue to be recycled under
the ridge resulting in continued chances for afternoon showers and
thunderstorms through mid-to-late week. Temperatures will remain
hotter than normal as the ridge remains positioned overhead. An
incoming trough will scour out our monsoonal moisture and bring an
end to the extreme heat of the past few weeks on Friday. Drier
conditions and more seasonal temperatures are expected over the
weekend.

&&

.DISCUSSION...through Sunday.

Persistent ridging over the Western US will continue through mid-
to-late week, keeping temperatures 3 to 5 degrees hotter than
normal and trapping monsoonal moisture under it. This moisture
will continue to be recycled each afternoon, fueling isolated to
scattered showers and thunderstorms across the area. As has been
the case for the past few days, convection will develop in areas
of higher terrain each afternoon before moving off the terrain and
over area valleys. Collapsing storms will produce gusty outflow
winds, which will help to kick off additional convection. Gusts
associated with these outflow winds are expected to be around 40
to 55 mph with the potential for 60+ mph wind gusts with stronger
storms. Outside of strong outflow winds, lightning, small hail,
and heavy rain capable of resulting in flash flooding will be
possible with any storms that develop.

The Storm Prediction Center (SPC) has painted southern Mohave County
and the lower Colorado River Valley with a Marginal Risk for severe
weather in the form of strong outflow winds. High resolution (HiRes)
models support this, showing storms in southeastern Mohave County
producing strong outflow winds later this afternoon/early this
evening. These winds will move west through the lower Colorado River
Valley and into eastern San Bernardino County.

As previously mentioned, chances for isolated showers and
thunderstorms will continue each afternoon through Thursday. An
incoming trough will scour moisture from the area and knock
temperatures down to more seasonal values. These seasonal
temperatures and drier conditions will continue through the weekend
before ridging attempts to return next week.

&&

.AVIATION...For Harry Reid...For the remainder of the morning,
expect generally light east winds of 10 knots or less. A lot of
uncertainty exists with respect to afternoon thunderstorms, which
may develop as early as 22z. The more likely timeframe of
thunderstorm impacts will be in the 23z-05z window, but confidence
remains low enough such that TEMPOs will not be introduced at
this time. Even if storms do not directly impact the airport,
gusty outflow winds will be likely and could come from any
direction, though it appears most likely that storms will develop
north of KLAS and develop southward late afternoon into the
evening hours. Should the stronger scenario play out, wind gusts
of 40-50 knots will be possible, along with heavy rains and
lightning. Activity should diminish by 07-09z with winds returning
to 10 knots or less and resuming their east/northeast direction.
A similar scenario appears probable for tomorrow as well, though
confidence remains low.

For the rest of southern Nevada, northwest Arizona and southeast
California...Showers and thunderstorms, along with gusty outflow
winds may affect almost any terminal this afternoon and evening.
The most likely timing will range from 22z-03z for northernmost
terminals, to 00z-09z for the southern terminals. Gusty winds of
30-50 knots may occur with any stronger storms near terminals this
afternoon and evening. Winds will generally remain diurnal
outside of thunderstorms with KBIH seeing southerlies shifting to
the northwest overnight, KDAG maintaining a generally
west/northwest direction, and winds elsewhere becoming light and
variable overnight. Given relatively high confidence in afternoon
storms, will maintain the TEMPO for TSRA at KBIH with other sites
likely to see introduction of TEMPOs as the afternoon progresses
and confidence increases.

&&

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

&&

DISCUSSION...Stessman
AVIATION...Austin

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

In the hours before

Local storm report, Jul 22, 7:34 PM PDT, 4 hours 30 minutes before

Preliminary Local Storm Report
National Weather Service Las Vegas NV
734 PM PDT Mon Jul 22 2024

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

0702 PM     Tstm Wnd Gst     Chloride                35.41N 114.20W
07/22/2024  M58 MPH          Mohave             AZ   Trained Spotter

            Trained spotter measured a gust of 58 mph in
            Chloride from a nearby thunderstorm.

0709 PM     Tstm Wnd Gst     5 E New Kingman-Butler  35.26N 113.93W
07/22/2024  M59 MPH          Mohave             AZ   ASOS

            Kingman Airport gusted to 59 mph at 1909 and
            again at 1912 due to a nearby thunderstorm.

&&

VARIAN

Local storm report, Jul 22, 8:06 PM PDT, 3 hours 58 minutes before

Preliminary Local Storm Report
National Weather Service Las Vegas NV
806 PM PDT Mon Jul 22 2024

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

0755 PM     Tstm Wnd Gst     4 NNE Bullhead City     35.16N 114.56W
07/22/2024  M58 MPH          Mohave             AZ   ASOS

            Laughlin Bullhead City Airport gusted to 58
            mph at 1955 due to a nearby thunderstorm.

&&

VARIAN

Local storm report, Jul 22, 8:36 PM PDT, 3 hours 28 minutes before

Preliminary Local Storm Report
National Weather Service Las Vegas NV
836 PM PDT Mon Jul 22 2024

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

0702 PM     Flash Flood      9 NE Dolan Springs      35.70N 114.17W
07/22/2024                   Mohave             AZ   Mesonet

            Flash flooding occurred at Archibald Wash
            over Pierce Ferry Road starting around 1902
            and persisted through sunset.

&&

VARIAN

Local storm report, Jul 22, 9:17 PM PDT, 2 hours 47 minutes before

Preliminary Local Storm Report...Summary
National Weather Service Las Vegas NV
917 PM PDT Mon Jul 22 2024

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

0202 PM     Tstm Wnd Gst     4 S Nipton              35.41N 115.26W
07/22/2024  M78 MPH          San Bernardino     CA   Mesonet

            Moore sensor measured 78 mph gust at 1402 as
            well as 72 mph gusts between 1406 and 1413
            and 67 mph gusts at 1416 from a nearby
            thunderstorm.

0434 PM     Landslide        10 W Lone Pine          36.59N 118.23W
07/22/2024                   Inyo               CA   Law Enforcement

            Rock slide reported along Whitney Portal
            Road from heavy rain nearby. Rocks blocked
            both lanes of the road. Road is impassable.

1205 AM     Rain             10 NE Dolan Springs     35.70N 114.17W
07/22/2024  M0.87 Inch       Mohave             AZ   Mesonet

            Archibald Wash ALERT reported 0.87 inches of
            rain from 1142 pm on July 21 through 1205 am
            on July 22.

0702 PM     Flash Flood      9 NE Dolan Springs      35.70N 114.17W
07/22/2024                   Mohave             AZ   Mesonet

            Flash flooding occurred at Archibald Wash
            over Pierce Ferry Road starting around 1902
            and persisted through sunset.

0702 PM     Tstm Wnd Gst     Chloride                35.41N 114.20W
07/22/2024  M58 MPH          Mohave             AZ   Trained Spotter

            Trained spotter measured a gust of 58 mph in
            Chloride from a nearby thunderstorm.

0709 PM     Tstm Wnd Gst     5 E New Kingman-Butler  35.26N 113.93W
07/22/2024  M59 MPH          Mohave             AZ   ASOS

            Kingman Airport gusted to 59 mph at 1909 and
            again at 1912 due to a nearby thunderstorm.

0755 PM     Tstm Wnd Gst     4 NNE Bullhead City     35.16N 114.56W
07/22/2024  M58 MPH          Mohave             AZ   ASOS

            Laughlin Bullhead City Airport gusted to 58
            mph at 1955 due to a nearby thunderstorm.

&&

Local storm report, Jul 22, 10:01 PM PDT, 2 hours 3 minutes before

Preliminary Local Storm Report
National Weather Service Las Vegas NV
1001 PM PDT Mon Jul 22 2024

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

0200 PM     Hail             1 ESE Colorado City     36.99N 112.97W
07/22/2024  M0.88 Inch       Mohave             AZ   Public

            Report of nickel sized hail resulting in
            tree damage. Numerous small tree branches
            down in Colorado City.

&&

VARIAN

Local storm report, Jul 22, 10:05 PM PDT, 1 hour 59 minutes before

Preliminary Local Storm Report...Summary
National Weather Service Las Vegas NV
1005 PM PDT Mon Jul 22 2024

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

0202 PM     Tstm Wnd Gst     4 S Nipton              35.41N 115.26W
07/22/2024  M78 MPH          San Bernardino     CA   Mesonet

            Moore sensor measured 78 mph gust at 1402 as
            well as 72 mph gusts between 1406 and 1413
            and 67 mph gusts at 1416 from a nearby
            thunderstorm.

0434 PM     Landslide        10 W Lone Pine          36.59N 118.23W
07/22/2024                   Inyo               CA   Law Enforcement

            Rock slide reported along Whitney Portal
            Road from heavy rain nearby. Rocks blocked
            both lanes of the road. Road is impassable.

1205 AM     Rain             10 NE Dolan Springs     35.70N 114.17W
07/22/2024  M0.87 Inch       Mohave             AZ   Mesonet

            Archibald Wash ALERT reported 0.87 inches of
            rain from 1142 pm on July 21 through 1205 am
            on July 22.

0200 PM     Hail             1 ESE Colorado City     36.99N 112.97W
07/22/2024  M0.88 Inch       Mohave             AZ   Public

            Report of nickel sized hail resulting in
            tree damage. Numerous small tree branches
            down in Colorado City.

0702 PM     Tstm Wnd Gst     Chloride                35.41N 114.20W
07/22/2024  M58 MPH          Mohave             AZ   Trained Spotter

            Trained spotter measured a gust of 58 mph in
            Chloride from a nearby thunderstorm.

0702 PM     Flash Flood      9 NE Dolan Springs      35.70N 114.17W
07/22/2024                   Mohave             AZ   Mesonet

            Flash flooding occurred at Archibald Wash
            over Pierce Ferry Road starting around 1902
            and persisted through sunset.

0709 PM     Tstm Wnd Gst     5 E New Kingman-Butler  35.26N 113.93W
07/22/2024  M59 MPH          Mohave             AZ   ASOS

            Kingman Airport gusted to 59 mph at 1909 and
            again at 1912 due to a nearby thunderstorm.

0755 PM     Tstm Wnd Gst     4 NNE Bullhead City     35.16N 114.56W
07/22/2024  M58 MPH          Mohave             AZ   ASOS

            Laughlin Bullhead City Airport gusted to 58
            mph at 1955 due to a nearby thunderstorm.

&&

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 22, 6:25 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Jul 22, 10:15 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 22, 10:19 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Jul 23, 12:51 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 23, 1:39 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	4 hr
Jul 23, 3:35 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	2 hr

Nearby

Flash Flood Warnings in California, 2024 Every flash flood warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.