An upper level low pressure system lingered near the California coast, helping to force isolated thunderstorms over the Mojave Desert. A couple of storms produced severe weather.
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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.
An upper level low pressure system lingered near the California coast, helping to force isolated thunderstorms over the Mojave Desert. A couple of storms produced severe weather.
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 Sep 11, 1:28 PM PST, 3 hours 2 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 228 PM PDT Mon Sep 11 2017 .SYNOPSIS...Best chances for showers and storms through Wednesday will remain across southeast California, the higher elevations of the southern Great Basin, and northern Mohave County. Breezy south to southwesterly winds are expected across portions of the area each of these days. Second half of the week looks dry with below normal temperatures bringing the first taste of fall to the area. && .SHORT TERM...through Wednesday night. There's been two long lived strong thunderstorms over Inyo and Esmeralda Counties today. Elsewhere, convection slow to develop with only a few weaker cells noted over northern Mohave County. Upper low positioned off the California Coast producing better shear environment will help sustain the potential for stronger thunderstorms over Inyo County and Esmeralda County through Tuesday. Gusty winds and hail main threat, while quick storm motion will minimize flash flood potential. Elsewhere can not rule out a slight chance of showers/thunderstorms mainly across the higher terrain of the southern Nevada and northwest Arizona. Models are slightly slower with the inland progression of the weakening upper low Wednesday/Wednesday night. With the slower timing increased POPs a bit across Inyo and Esmeralda Counties, while better dynamics shifts east over Lincoln, Clark and Mohave Counties. Some showers/thunderstorms will probably linger into Thursday morning in Lincoln and northern Mohave Counties before this low clears the area. South-southwest breezes increase Tuesday afternoon, but more so on Wednesday while temperatures stay on the warm side. .LONG TERM...Thursday through Sunday. The closed upper low off the southern California coast will finally move inland and push into our region by Thursday. The low will bring some dry southwest flow across much of the SW region, pushing most of the lingering moisture northeastward. This transition will allow for diffluent flow across northern Mohave and Lincoln counties early Thursday morning, which will allow for enough forcing to support isolated to scattered chances mainly across eastern Lincoln, northern Mohave, and along higher terrain across our northern CWA. By Thursday afternoon, an upper level trough over the Pacific NW will dig further south sweeping the closed low out of our region. Ahead of the trough, forcing and lingering moisture will keep slight chances across northern portions of our CWA, with the best chances across northern Lincoln county Friday morning. Some subtle differences between the medium range models exist Friday. The ECMWF digs the trough further into our region Friday, which may increase rain chances further south. However, confidence remains low with this scenario as ensemble models are trending toward the GFS with POPs mainly across our northeastern CWA. Both Thursday and Friday afternoons will be a bit breezy, generally 15-20 MPH, with strongest winds around 25 MPH across western San Bernardino County. Precipitation chances decay through the day Friday with nearly no mentionable chances by midnight as cooler, drier air filters in from the southwest. Friday will feel fall-like behind the trough passage with temperatures 8-10 degrees BELOW seasonal normals. The weekend will be quiet pleasant with a slight uptick in temperatures each day as dry southwest flow settles in behind the trough with mostly clear skies and light winds. && .AVIATION...For McCarran...Light, east-southeast wind should continue into early evening before typical southwesterly shift is expected overnight. Winds should briefly go easterly late Tuesday morning before a southwesterly wind overtakes the terminal Tuesday afternoon. Any showers or thunderstorms look to stay over the surrounding mountains, impacting the mainly the Beatty corridor. For the rest of southern Nevada, northwest Arizona and southeast California...Isolated to scattered showers and thunderstorms will be possible this evening through Tuesday over Inyo County, northwest Arizona, and the higher elevations of the southern Great Basin. Winds will increase from the south-southwest Tuesday, but more so on Wednesday. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && SHORT TERM/AVIATION...Pierce LONG TERM....Kryston For more forecast information...see us on our webpage: http://weather.gov/lasvegas or follow us on Facebook and Twitter
The Edwards AFB radar (KEYX), 168 km away, was scanning. The volume nearest the first event began at 00:27 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew the roof off one building, damaged five other roofs, and blew windows out of four vehicles.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2017Every state in 2017This day in weather historyWarnings in California, September 2017
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: 716621.