Alert archive / Arizona / Flash Flood Warnings in 2022

Flash Flood Warning 141, NWS Las Vegas, NV

August 10, 2022Mohave County, Arizona; Clark County, Nevada; San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 10, 2022, 4:05 PM MST for Mohave County, Arizona; Clark County, Nevada; San Bernardino County, California. It was in force for 2 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: Aug 10, 2022, 4:05 PM MST (23:05 UTC)
Expired: Aug 10, 2022, 6:30 PM MST
In force: 2 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Mohave County, AZ, San Bernardino County, CA, Clark County, NV

The radar

The Las Vegas radar (KESX), 21 km from the middle of the area, began a volume at 23:07 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 12:00Z, 11.1 hours before the alert went out and 112 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: 870 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1562 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

831 
WGUS55 KVEF 102305
FFWVEF
AZC015-CAC071-NVC003-110130-
/O.NEW.KVEF.FF.W.0141.220810T2305Z-220811T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
405 PM PDT Wed Aug 10 2022

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  Western Mohave County in northwestern Arizona...
  San Bernardino County in southern California...
  Southwestern Clark County in southern Nevada...

* Until 630 PM MST /630 PM PDT/.

* At 405 PM MST /405 PM PDT/, local law enforcement reported 
  thunderstorms producing heavy rain across the warned area. Flash 
  flooding is ongoing or expected to begin shortly. Flooding has 
  been reported along US 95 near Mile Marker 35.

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

  SOURCE...Law enforcement reported.

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

* Some locations that will experience flash flooding include...
  Laughlin, Searchlight, Primm, Nipton Road Mile Marker 3, Nipton, 
  Cal-Nev-Ari, Nipton And Ivanpah Roads, Cottonwood Cove Campground, 
  Cottonwood Cove and Mountain Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3573 11517 3572 11498 3566 11469 3564 11467
      3559 11466 3558 11468 3554 11466 3549 11468
      3541 11463 3532 11460 3525 11466 3518 11485
      3525 11516 3540 11549 3571 11570

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

$$

Planz

2 follow-up statements

785 
WGUS75 KVEF 110053
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
553 PM PDT Wed Aug 10 2022

AZC015-CAC071-NVC003-110130-
/O.CON.KVEF.FF.W.0141.000000T0000Z-220811T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-San Bernardino CA-Clark NV-
553 PM MST Wed Aug 10 2022 /553 PM PDT Wed Aug 10 2022/

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MST/630 PM 
PDT/ THIS EVENING FOR WESTERN MOHAVE, SAN BERNARDINO AND 
SOUTHWESTERN CLARK COUNTIES...

At 553 PM MST /553 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...
  Laughlin, Searchlight, Primm, Nipton Road Mile Marker 3, Nipton, 
  Cal-Nev-Ari, Nipton And Ivanpah Roads, Cottonwood Cove Campground, 
  Cottonwood Cove and Mountain Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3573 11517 3572 11498 3566 11469 3564 11467
      3559 11466 3558 11468 3554 11466 3549 11468
      3541 11463 3532 11460 3525 11466 3518 11485
      3525 11516 3540 11549 3571 11570

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

$$

BEP

996 
WGUS75 KVEF 110122
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
622 PM PDT Wed Aug 10 2022

AZC015-CAC071-NVC003-110132-
/O.EXP.KVEF.FF.W.0141.000000T0000Z-220811T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-San Bernardino CA-Clark NV-
622 PM MST Wed Aug 10 2022 /622 PM PDT Wed Aug 10 2022/

...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM MST/630 PM PDT/ THIS 
EVENING FOR WESTERN MOHAVE, SAN BERNARDINO AND SOUTHWESTERN CLARK 
COUNTIES...

Only light rain is still falling. Flooding is no longer expected to 
pose a threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 1200 AM MST/1200 AM PDT for 
portions of northwest Arizona, southeast California and Nevada.

LAT...LON 3573 11517 3572 11498 3566 11469 3564 11467
      3559 11466 3558 11468 3554 11466 3549 11468
      3541 11463 3532 11460 3525 11466 3518 11485
      3525 11516 3540 11549 3571 11570

$$

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 Aug 10, 12:58 PM MST, 3 hours 7 minutes earlier.

Area forecast discussion, Aug 10, 12:58 PM MST, 3 hours 7 minutes before

Area Forecast Discussion
National Weather Service Las Vegas NV
1258 PM PDT Wed Aug 10 2022

.SYNOPSIS...With moisture in place, monsoon activity is forecast to
continue through the week. Scattered thunderstorms will be
possible each afternoon, especially in southern Nevada through
western Arizona. Flash flooding will be the primary concern with
these storms. Cooler temperatures are expected throughout the
week.
&&

.SHORT TERM...The Rest of Today and Thursday.

Mesoanalysis and short term models through the afternoon continue to
highlight an increased risk for thunderstorms with heavy rain and
flash flooding for southern Nevada, eastern San Bernardino County,
and all of Mohave County. PWATs around 2 SD above normal are noted
over the region. In addition, despite morning and early afternoon
sunshine that should allow for dry air to mix out dewpoints, many
locations still show dewpoints over 60F. Through the rest of the
afternoon into the evening, thunderstorms will continue to impact
parts of the region. Of note, short term models want to focus
thunderstorms over Mohave County along and north of I-40, the high
terrain of Clark County potentially impacting areas such as Mt
Charleston and traffic on I-40 or US-95 around Primm, Jean, and
Searchlight, and western Lincoln County. Thunderstorms so far today
have already reported rainfall rates of 2-3inch/hr or more. Further
west, isolated thunderstorms with heavy rain are possible but should
not be as widespread in all areas. Inyo County is the only area that
should remain dry this evening. A few storms may also have strong
winds as elevated cores with tall storms dropping quickly and/or wet
microbursts.

Storms will dissipate early tonight. Expecting all convection to be
over by around 06Z tonight, however isolated showers with limited
impacts are possible after 06Z. For Thursday morning through the
afternoon, models hint at another MCV or piece of energy pivoting
through the region, but are unsure where it will develop and move
through. This will drive the highest precipitation chances and
impacts, so will need to watch this feature closely. HREF 3hr QPF of
1inch PMMs highlight Lincoln, Clark, and Mohave again tomorrow
afternoon, which would be the area that is most likely the wave
would move through. May need to extend the Flash Flood Watch for
parts of the area as PWATs will remain high Thursday so heavy rain
and flash flooding will continue to be a threat for where
thunderstorms develop.

.LONG TERM...Friday through next week.

There is no sign of a pattern change in the extended forecast.
Ensemble guidance continues to show a dominant 500mb high over the
Four Corners/Southern Rockies region. This keeps us under south-
southeasterly flow which supplies the monsoon moisture. GFS and
ECMWF ensemble means show PWATs at or above 1.25" through next week.
Thus, above-normal rain chances and seasonal temperatures are
expected to persist through the period.
&&

.AVIATION...For Harry Reid...A moist southeasterly flow will
continue to bring abundant cloud cover across southern Nevada.
Showers and thunderstorms are expected to develop over the higher
terrain around the Las Vegas Valley and potentially move into the
valley between 21-00z this evening. Brief heavy rain, gusty outflow
winds, and lightning will be possible. Outside of any thunderstorm
influences look for south winds around 6-8 kts. Storms are expected
to dissipate this evening.

For the rest of southern Nevada, northwest Arizona and southeast
California...Isolated to scattered thunderstorms are expected
through this afternoon generally across eastern San Bernardino,
Clark, Lincoln and Mohave Counties. Any storms will likely impact
KLAS/KHND/KVGT/KEED/KIFP TAF sites with only slight chances
elsewhere. Storm movement today will be towards the north-northwest.
Cloud bases 10-12 kft MSL. Main impacts will be heavy rain, gusty
outflow winds, and lightning. Storms are expected to dissipate this
evening.
&&

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

SHORT TERM...Nickerson
LONG TERM...Woods
AVIATION...Gorelow

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, Aug 10, 1:20 PM MST, 2 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
120 PM PDT WED AUG 10 2022

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

1218 PM     FLASH FLOOD      10 ENE CHLORIDE         35.44N 114.03W
08/10/2022                   MOHAVE             AZ   COUNTY OFFICIAL

            FLOOD CONTROL WEBCAM SHOWS FLOODING AT VOCK
            CANYON AT STOCKTON HILL ROAD.

&&

MS

Local storm report, Aug 10, 3:11 PM MST, 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
311 PM PDT WED AUG 10 2022

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

0745 PM     FLASH FLOOD      13 NW DOLAN SPRINGS     35.70N 114.47W
08/09/2022                   MOHAVE             AZ   COUNTY OFFICIAL

            CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 13
            NW DOLAN SPRINGS. WEST WHITE HILLS ROAD
            CLOSED FROM HIGHWAY 93 TO NORTH WHITE FOX
            DRIVE DUE TO FLOODING.

&&

MS

Local storm report, Aug 10, 3:15 PM MST, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
315 PM PDT WED AUG 10 2022

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

0200 PM     FLASH FLOOD      5 SSW GOLDEN VALLEY     35.16N 114.24W
08/10/2022                   MOHAVE             AZ   COUNTY OFFICIAL

            WEST SHINARUMP DRIVE CLOSED FROM SOUTH AZTEC
            ROAD TO SOUTH COLORADO ROAD DUE TO FLOODING.

&&

MS

Local storm report, Aug 10, 3:23 PM MST, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
323 PM PDT WED AUG 10 2022

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

0200 PM     FLASH FLOOD      3 SE GOLDEN VALLEY      35.20N 114.19W
08/10/2022                   MOHAVE             AZ   COUNTY OFFICIAL

            WEST REDWALL DRIVE IS CLOSED FROM SOUTH
            AZTEC ROAD TO SOUTH VERDE ROAD DUE TO
            FLOODING.

&&

MS

Local storm report, Aug 10, 3:54 PM MST, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
354 PM PDT WED AUG 10 2022

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

0525 PM     FLASH FLOOD      6 ENE SOUTH COVE        36.12N 114.00W
08/09/2022                   MOHAVE             AZ   PARK/FOREST SRVC

            PIERCE FERRY ROAD IN THE LAKE MEAD NATIONAL
            RECREATION AREA IS CLOSED DUE TO FLOODING.

&&

MS

Local storm report, Aug 10, 4:00 PM MST, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
400 PM PDT WED AUG 10 2022

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

0315 PM     TSTM WND GST     12 SW ELGIN             37.25N 114.71W
08/10/2022  M58 MPH          LINCOLN            NV   MESONET

            KANE SPRINGS RAWS SITE MEASURED A GUST OF 58
            MPH. TIME ESTIMATED USING RADAR.

&&

MS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 5:11 PM MST	Dust Storm Warning	VEF	Mohave	64 min
Aug 9, 5:18 PM MST	Severe Thunderstorm Warning	VEF	Mohave	57 min
Aug 9, 5:47 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr
Aug 9, 5:55 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 9, 6:18 PM MST	Severe Thunderstorm Warning	VEF	Mohave	57 min
Aug 10, 11:24 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	30 hr
Aug 10, 11:51 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	28 hr
Aug 10, 12:32 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	30 hr
Aug 10, 12:39 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	30 hr
Aug 10, 1:38 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	28 hr
Aug 10, 1:55 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 10, 4:38 PM MST	Areal Flood Warning	VEF	Mohave	12 hr
Aug 10, 1:44 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Aug 10, 2:28 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Aug 10, 2:54 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Aug 10, 3:26 PM MST	Areal Flood Advisory	VEF	Clark	39 min
Aug 10, 4:01 PM MST	Flash Flood Warning Considerable damage threat	VEF	Lincoln	3 hr

Nearby

Flash Flood Warnings in Arizona, 2022 Flash Flood Warnings in Nevada, 2022 Flash Flood Warnings in California, 2022 Every flash flood warning in 2022

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.