Outflow winds from thunderstorms in Arizona knocked a paddleboarder off his board and into Lake Mead near Boulder Island. His body was recovered four days later.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS VEF wrote it up.
Outflow winds from thunderstorms in Arizona knocked a paddleboarder off his board and into Lake Mead near Boulder Island. His body was recovered four days later.
The local office's own words before the first event, 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 the first event at Aug 10, 11:54 AM PST, 7 hours 36 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 1254 PM PDT Sat Aug 10 2024 .SYNOPSIS...Monsoonal moisture will continue to provide fuel for thunderstorms across southern Nevada, northwest Arizona and eastern San Bernardino County through Sunday. Above normal temperatures will continue as high pressure persists over the southwestern states. Drier air is forecast to push into the region Monday and much of the coming week, reducing thunderstorm chances and bringing slightly cooler temperatures to the region. && .SHORT TERM...through Sunday night. Thunderstorms started developing before noon over the mountains of southern Nevada and northwest Arizona and conditions are favorable for thunderstorm coverage to expand through the afternoon as cells slowly move toward the east-southeast. This will increase the potential for storms moving off the mountains and across the valleys of central and southern Clark County including Las Vegas... especially over the southern and western parts of the metro area. Surface CAPE values around 1000 J/kg were in place across much of southeast Nevada northwest Arizona and eastern San Bernardino County in California and full surface heating will largely remove any remaining CIN. Also, surface dewpoints in the upper 50s and precipitable water values near 1.4 inches support the potential for isolated heavy rain with some storms. After surface heating initiates storms, boundary interactions should aid convection into this evening especially over Mohave County and the lower Colorado River Valley. Hi res models indicate the potential for convection over southwest Arizona this afternoon to push widespread outflow and additional low level moisture up across northwest Arizona and far southern Nevada tonight. This additional infusion of moisture will keep the moist and unstable air mass largely over the same portion of our forecast area Sunday. The latest HREF and NBM indicate a slight decrease in PoPs over Clark County Sunday afternoon, but higher values over northeast Mohave County around Colorado City. There are indications of ingredients coming together for heavy rainfall concentrating around that area Sunday afternoon. High temperatures will continue to run 3-6 degrees above normal which translates to highs of 103 to 109 across the Mojave Desert zones. Overnight lows stay warm in the lower deserts. .LONG TERM...Monday through Saturday. A drying trend is shaping up Monday through at least Thursday as a broad trough dropping down from the Pacific Northwest into the western states leads to a widespread dry southwest flow which will begin pushing moisture east of our area Monday then will likely totally scour it out by Tuesday. An eastern Pacific high approaching the SoCal coast then reinforces the drying with west-northwest flow aloft Wednesday-Thursday which may persist beyond as ensemble clusters indicate another broad trough dipping over the Pacific Northwest and northern California/Nevada. However, if this trough axis holds near the West Coast it would allow the ridge to amplify over New Mexico/Colorado and resulting in a southeast flow directing moisture from northern Mexico up across Arizona and back into our area Friday and Saturday. The ECMWF ensemble members are indicating this trend more than the GEFS. The latest NBM Pop grids do bring 20-30 percent values into eastern Mohave County Friday then spread 15-20 percent values into southern Nevada by Saturday afternoon. While we wait for monsoon moisture to return, breezy afternoons and high temperatures holding generally between 100 and 108 degrees can be expected for most desert zones. && .AVIATION...For Harry Reid...A messy afternoon and early evening is likely. Thunderstorms will develop over the local mountains and drift east to southeast, ejecting outflow winds which will not only impact airport operations but also help develop new thunderstorms. There is a high (70%) probability of outflow winds of 20 to 30 knots affecting the terminal, and a lower (30%) probability of a thunderstorm directly impacting the airfield. By about 03Z the weather should be settling down, but there is low confidence in what the winds will look like at that time after possibly multiple rounds of outflows. It looks like thunderstorm potential will be a little bit lower on Sunday and much lower on Monday, although the Mormon Mesa and Peach Springs corridors will still be affected. For the rest of southern Nevada, northwest Arizona and southeast California...Thunderstorm chances are expected this afternoon and evening near and east of a line from Morongo Valley to Mount Charleston to Rachel, with the highest chances in Mohave County. The main threats will be erratic, gusty winds and locally lowered ceilings with terrain obscuration. The same areas will be at risk for thunderstorms Sunday, with the same threats, before drier air moving in from the west pushes thunderstorm chances eastward to Mohave County and the Nevada/Utah border area on Monday. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && SHORT TERM/LONG TERM...Adair AVIATION...Morgan 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
749 PM PDT Sat Aug 10 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0633 PM Tstm Wnd Gst 4 S Nipton 35.41N 115.26W
08/10/2024 M60 MPH San Bernardino CA Mesonet
Moore UPR Observation site gusted to 60 mph
with thunderstorm activity overhead.
&&
COPreliminary Local Storm Report
National Weather Service Las Vegas NV
806 PM PDT Sat Aug 10 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0610 PM Flash Flood 2 NE Hualapai Peak 35.09N 113.88W
08/10/2024 Mohave AZ Fire Dept/Rescue
Flash Flooding Reported by Fire Department
in Pine Lake community. Some rural roadways
in the area impassable.
&&
COThe Las Vegas radar (KESX), 39 km away, was scanning. The volume nearest the first event began at 03:29 UTC.
1 thunderstorm wind. Local standard time, as filed.
One person died after being knocked off his paddleboard and into Lake Mead by outflow winds from thunderstorms in Arizona. Five other people were rescued.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Thunderstorm Wind, Clark | 2024-08-10 | 58 | Male | In Water | Indirect |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2024Every state in 2024This day in weather historyWarnings in Nevada, August 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1211189.