Lingering moisture fueled isolated thunderstorms over the Mojave Desert. A couple of storms produced flash flooding.
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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.
Lingering moisture fueled isolated thunderstorms over the Mojave Desert. A couple of storms produced flash flooding.
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 Jul 29, 2:39 PM MST, 4 hours 36 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 239 PM PDT Sat Jul 29 2017 .SYNOPSIS...Monsoon moisture will continue to push in from the south increasing chances for showers and storms today through next week. Storms and showers will be primarily across Mohave, Lincoln and San Bernardino counties today with chances spreading further north into other portions of southern Nevada Sunday through mid week. && .SHORT TERM...through Monday night. The focus of the short term continues to be inverted trough/easterly wave now moving across northern Mexico/southeastern Arizona. As high pressure rebuilds and shifts across northern Nevada, flow will have an increasingly easterly component, which is already allowing moisture recovery in the area. As the wave continues westward, expect increasing moisture and thunderstorm chances Sunday and Monday. Models in decent agreement with keeping the deepest moisture a little more limited, with the areas at highest risk of receiving heavy rain in eastern San Bernardino, southern Clark, and southern Mohave counties. If confidence in coverage increases, a watch may be needed before too long in these area, as flooding will be possible with amble moisture and forcing present. As is the usual concern, MCVs from activity in Arizona could swing the balance one way or the other. As the wave progresses off-shore Monday evening, high pressure will dominate the region, however, it is not impressively strong, and it will be rather moisture ridden. Thus, fairly low confidence in the subsidence actually preventing storms on any given day, especially on higher terrain. Additionally, the pattern will remain favorable for thunderstorms to move into much of the area from southern Utah and Arizona. .LONG TERM...Tuesday through Friday. Made few changes to the longer term with moisture lingering through the period and daily chances of at least isolated thunderstorms. Tuesday will start out with an easterly wave pushing westward across the forecast area, perhaps a little slower than previously advertised and maintaining thunderstorm chances especially across our southern zones. Moisture will tend to decrease from northeast to southwest late in the week as high pressure builds over central Nevada, but the magnitude of this drying is debatable and the ECMWF is more intent on keeping sufficient moisture in place for thunderstorm chances. Meanwhile, the GFS builds the high over southern Nevada by Friday afternoon which would tend to suppress thunderstorm chances and block deeper moisture from pushing in from the south. With no scouring of the moisture indicated by means of a larger scale trough, hesitate to reduce PoPs on any one particular day until we can get a better handle on where the high will be setting up. As such, maintained slight chance PoPs for the valleys and greater chances in the higher elevations, and as mentioned before, each days potential will depend on both convection the day/night preceding it as well as daily cloud cover trends. Temperatures will hover a few degrees above normal through the period, unless that trend is disturbed by a larger scale thunderstorm complex. && .FIRE WEATHER... Moisture is increasing across the area from east to west, and is forecast to continue this trend through the weekend. As moisture increases, so do thunderstorm chances, especially for Clark, Mohave, and eastern San Bernardino counties. Chances of wetting rain should be fairly close to chances of thunderstorms, as the moisture rich atmosphere will allow thunderstorms to produce heavy rain. The only exception would be along the western extent of the moisture push across Inyo and San Bernardino counties. Thunderstorms that form before moisture increases too much will be capable of gusty winds and even a dry lightning strike or two with extremely limited coverage. The pattern remains favorable for afternoon and evening thunderstorm chances through next week. && .HYDROLOGY...Creeks, streams and rivers in northern Inyo County have shown decreasing flows over the last couple of days. However, some road closures continue in the area. Bishop Creek Bypass and Big Pine Creek Bypass continue to be utilized to minimize flows through Bishop and Big Pine. Increasing moisture will bring increasing thunderstorm chances, which could produce additional runoff that could rapidly increase flows. Remember, never drive through flooded roadways or around barricades. Also, pastureland or farmland adjacent to creeks, streams or rivers could experience areas of standing water. && .AVIATION...For McCarran...East or southeast winds will be favored for the remainder of the afternoon with partly cloudy skies. Speeds should hold in 6 to 10 knot range but a few stronger gusts can't be ruled out. Low confidence in the forecast starting this evening as the potential exists for some thunderstorm outflow to move through, most likely out of the east or northeast. Should this occur, a period of gusty northeast winds would be expected between 2z-6z as well as the possibility of some thunderstorm activity. More likely scenario is for conditions to remain dry and thunderstorms staying limited to areas east and south of the airfield. Assuming no thunderstorm impacts, diurnal southerly winds would take over after dark in the 6 to 9 knot range. Similar conditions expected again Sunday. For the rest of southern Nevada, northwest Arizona and southeast California...Most of the region will see partly to mostly sunny skies this afternoon and evening with light winds. Breezy southwest winds of 10-15 knots with occasional gusts are likely near KDAG. Convection will tend to favor Northwest Arizona and the mountains of Southern Nevada but a stray storm is possible almost anywhere, even near KBIH during the evening hours. Winds outside of thunderstorm activity will favor diurnal trends. Similar conditions expected again Sunday. && .SPOTTER INFORMATION STATEMENT...Thunderstorm chances will increase through the weekend, especially across portions of San Bernardino, Clark, and Mohave counties. Spotters are requested to report instances of flooding and impacts through standard operating procedures. && Short Term...........Steele Long Term/Aviation...Outler For more forecast information...see us on our webpage: http://weather.gov/lasvegas or follow us on Facebook and Twitter
The Las Vegas radar (KESX), 174 km away, was scanning. The volume nearest the first event began at 02:14 UTC.
1 flash flood. Local standard time, as filed.
Signal Road was closed from Highway 93 to Alamo Road due to flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2017Every state in 2017This day in weather historyWarnings in Arizona, July 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: 709581.