Broad troughing and low grade monsoon moisture triggered an isolated thunderstorm over Inyo County.
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The episode as NWS VEF wrote it up.
Broad troughing and low grade monsoon moisture triggered an isolated thunderstorm over Inyo County.
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 4, 2:26 PM PST, 1 hour 19 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 326 PM PDT Tue Sep 4 2018 .SYNOPSIS...Storm chances will remain across much of the area through Wednesday with below normal temperatures. Drier weather and warming temps are expected Thursday onward as high pressure builds in across the area. && .SHORT TERM...Through Thursday night. Radar continues to detect some weak returns along the Nevada/Arizona border, east of Echo Bay extending east across northern Mohave County. Also, a few returns showing up in southeast Lincoln County. Models in agreement that the broad mid-level trough will continue to encompass the Intermountain West today and Wednesday. Looking in closer at the H5 streamline analysis, models showing that a main cyclonic circulation will stay nearly stationary over southern Nevada, northwest Arizona and southwest Utah today and Wednesday. As high clouds dissipate this morning this cyclonic circulation becoming more apparent on IR imagery by cloud motion over Clark County. Monday afternoon's Las Vegas sounding showed PW values have crept back above 1". Weak storm motion forecast the next two days which will allow stronger cells to produce brief bursts of moderate- heavy rainfall. Storm also capable of producing downburst wind gusts around 30 kts. By Wednesday night and Thursday, trough will start to shift east across Utah/Arizona. High pressure building in from the west will account for a drier/more stable air mass on Thursday. Cloudiness/precipitation will produce slightly below normal temperatures today and Wednesday. Warm up will commence on Thursday. .LONG TERM...Thursday through Monday. No major changes to the forecast through next weekend. Models agree that an area of high pressure aloft in the Eastern Pacific will move closer to shore, bringing in a dry westerly flow into early next week. As a result, shower and storm potential remain low for the latter half of this week and through the weekend. Temperatures will increase as the aforementioned high pressure builds, resulting in both high and low temperatures trending 7-10 degrees above normal. Temperatures expected to peak on Saturday and begin declining through next week. && .AVIATION...For McCarran...Partly cloudy skies along with light winds this morning. The chance for nearby showers and thunderstorms increases during the afternoon into the evening. The valley will have to watch out for potential outflow winds of around 30 kts anytime after 21z. Last of any showers/thunderstorms should end around 06z this evening with typical downvalley winds developing overnight. For the rest of southern Nevada, northwest Arizona and southeast California...Isolated to scattered showers and thunderstorms expected primarily across northwest Arizona, southern Nevada and Inyo County today and Wednesday. Downburst wind gusts around 30 kts possible along with brief periods of heavy rainfall. Away from any thunderstorms, surface winds will follow typical diurnal trends. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && SHORT TERM/AVIATION...Pierce LONG TERM...Varian 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), 153 km away, was scanning. The volume nearest the first event began at 23:46 UTC.
1 flash flood. Local standard time, as filed.
Rocks and mud covered Highway 136.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2018Every state in 2018This day in weather historyWarnings in California, September 2018
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: 779380.