The season's first push of monsoon moisture brought scattered thunderstorms to the Mojave Desert. Some storms produced severe weather and flash flooding.
Every event with a place to put it. Tap one for its entry below.
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.
The season's first push of monsoon moisture brought scattered thunderstorms to the Mojave Desert. Some storms produced severe weather and 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 8, 8:29 PM PST, 3 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 929 PM PDT Sat Jul 8 2017 .SYNOPSIS...The first significant push of monsoon moisture is expected to bring expanding thunderstorm chances to the area over the next few days. With the increasing moisture and cloud debris, daytime temperatures for Sunday and Monday are expected to be cooler before most of the area gradually warms up and drys out Tuesday onward. && .UPDATE...At 9 PM, satellite and radar imagery were showing scattered thunderstorms over and around Laughlin south to Topock with moderate to heavy rain and gusty winds reported. Lighter shower activity over central and northern Mohave County and southern Lincoln County. Numerous outflow boundaries were appearing on radar and gusty/erratic winds are possible through the evening hours. An expansive cloud shield over southern Mohave, Clark and eastern San Bernardino counties associated with convection this evening may inhibit thunderstorm development on Sunday...at least initially. -Salmen && .AVIATION...For McCarran...Gusty outflow winds will impact the airport through this evening as outflow boundaries move across the valley. Winds are expected to shift back to the southwest with speeds around 10 kts later tonight. Thunderstorms are likely to be more scattered Sunday with gusty and erratic outflow winds impacting the terminal at times during the afternoon and early evening. No operationally significant ceilings are forecast, but localized turbulence and icing hazards can be expected with any shower/thunderstorm activity. For the rest of southern Nevada, northwest Arizona and southeast California...Generally light winds following typical summertime diurnal trends expected at most terminals tonight, outside of thunderstorm influences. Isolated to scattered thunderstorms are forecast Sunday with slightly better coverage. Gusty outflow winds will be the main impact, but brief heavy rain will be possible. && .PREVIOUS DISCUSSION...253 PM PDT... .SHORT TERM...through Monday night. Thunderstorm activity will be on the increase through Monday as monsoon moisture pushes into the area from Arizona. Precipitable water values greater than an inch currently encompass much of the SE CWA and are forecast to expand to much of the southern half of the area on Sunday and Monday. A juicer airmass is on our southern doorstep with surface dewpoint temperatures in the 50-60 degree range. A large thunderstorm complex over south central Arizona this afternoon is moving westward with the general 850-700MB flow directing it towards our area. The latest HRRR surface wind analysis and forecast suggests outflow winds from this activity as well as other convection over central Arizona reaching the eastern Mohave County border late this afternoon and spreading west into Clark County this evening. In addition, the HRRR brings thunderstorm outflow winds to Lincoln and Clark counties from storm activity over southwestern Utah which could bring storm activity to the Las Vegas Valley later this evening. All and all, it should be interesting to see how this all plays out. .LONG TERM...Tuesday through Saturday. Upper high shifts further east into the central states Tuesday- Thursday allowing southwest flow associated with Pacific Northwest trough to bring a drier/more stable air mass to parts of the region. The probability of thunderstorms decrease Tuesday-Thursday across San Bernardino County and southern Nevada, more so across Mohave County Wednesday and Thursday. The troughing influence will allow for a slight chances of thunderstorms across northern portions of Inyo and Esmeralda Counties. The models show the high center shifting west becoming established once again over northern Utah Friday/Saturday. Easterly flow south of the high center combined with an inverted trough over northwest Mexico should have low level moisture pushing back west into Mohave County by next weekend. Near to slightly above normal temperatures early-midweek will begin to rise late week. Tropical Storm Eugene in the eastern Pacific is forecast to become a Hurricane Sunday. Then Hurricane Eugene will move northwest well away from the Baja Peninsula through Monday before dissipating in colder waters by Wednesday. None of the models at this time show any injection of moisture into the region from Eugene but its something we'll be monitoring closely. Temperatures will be around normal Tuesday through Thursday, but will once again warm to around 5-7 degrees above normal by Friday as the high rebuilds back to the west. && .FIRE WEATHER...Monsoon moisture will bring an increase in lightning activity to the area over the next few days with the initial round of storm activity possibly dropping very little rain resulting in an increasing potential for new fire starts. As moisture increases and deepens, there will be better chances for wetting rains from thunderstorms. A drying and warming trend will commence by Tuesday through the end of the week. && .HYDROLOGY...Isolated thunderstorms over the eastern Sierra over the next few days may aid snowmelt runoff and keep some drainages elevated with ongoing minor flooding possible. 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. && .SPOTTER INFORMATION STATEMENT...Increasing monsoonal moisture will lead to increasing thunderstorm chances and cooler temperatures Sunday and Monday. Conditions are not currently forecast to be favorable for widespread flash flooding risks, however, spotters are always encouraged to report significant rainfall amounts as well as any reports of damage or flooding. && Short Term...Salmen Long Term/Aviation...Gorelow For more forecast information...see us on our webpage: http://weather.gov/lasvegas or follow us on Facebook and Twitter
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
822 PM PDT SAT JUL 8 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0745 PM TSTM WND DMG 3 ESE LAKE HAVASU CITY 34.47N 114.28W
07/08/2017 MOHAVE AZ PUBLIC
DAMAGE TO A RECENTLY UPDATED ROOF NEAR
SARATOGA AND WINSTON. PICTURE OBTAINED FROM
FACEBOOK. TIME ESTIMATED.
&&
RAWPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
845 PM PDT SAT JUL 8 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0745 PM TSTM WND DMG 3 ENE LAKE HAVASU CITY 34.50N 114.28W
07/08/2017 MOHAVE AZ PUBLIC
SEVERAL REPORTS OF PALM TREES DOWNED AND
AWNINGS DAMAGED NEAR MCCULLOCH AND CHERRY
TREE. TIME ESTIMATED.
&&
RAWPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
859 PM PDT SAT JUL 8 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0745 PM TSTM WND DMG 3 ENE LAKE HAVASU CITY 34.49N 114.28W
07/08/2017 MOHAVE AZ PUBLIC
ROOF DAMAGE REPORTED AT NORTHSTAR AND SLOOP,
LAKE HAVASU CITY, AZ. TIME ESTIMATED.
&&
RAWPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
902 PM PDT SAT JUL 8 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0750 PM TSTM WND GST 2 WSW LAKE HAVASU CITY 34.47N 114.35W
07/08/2017 M56 MPH MOHAVE AZ MESONET
LONDON BRIDGE WIND SENSOR REPORTED A PEAK
WIND OF 56 MPH AT 750 PM.
&&
RAWThe Las Vegas radar (KESX), 82 km away, was scanning. The volume nearest the first event began at 04:33 UTC.
4 flash flood. Local standard time, as filed.
Rocks and boulders washed onto Needles Highway.
A vehicle was stuck in flood waters 11 miles W of Panamint Springs.
Highway 190 was closed due to flooding of the Centennial Wash.
Flash flooding closed Emigrant Canyon Road and West Side Road in Death Valley. The Amargosa River also flowed over the south end of West Side Road.
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, 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: 707211, 707212, 707214, 707215.