A couple of thunderstorms over Utah on July 2 and July 5 produced severe wind gusts.
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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 SLC wrote it up.
A couple of thunderstorms over Utah on July 2 and July 5 produced severe wind gusts.
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 Salt Lake City, UT wrote its last area forecast discussion before the first event at Jul 2, 2:47 PM MST, 1 hour 13 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 347 PM MDT Sun Jul 2 2017 .SYNOPSIS...A weakening trough will make its way across the forecast area through tomorrow morning. High pressure will rebuild over the region beginning late tomorrow, with moisture increasing for the middle and latter part of the week. && .SHORT TERM (Through 06Z Thursday)...A weak short wave lifting northeast out of east-central Utah (attendant with the weakening trough passing through) has sparked isolated to widely scattered showers and a few thunderstorms this afternoon. The isolated deeper storm activity has fired over the terrain on the NWern periphery of this circulation where an instability axis of roughly 500 j/kg exists per SPC mesoanalysis. Expecting a continuation of development into this evening, with focus keying in on the northeast from the northern Wasatch Plateau NE across the Uinta Basin and mountains. Elsewhere very warm temperatures have been realized across the area with maxes this far pushing 5-10 degrees above climo this afternoon. With a further building of heights tomorrow and clearing skies, anticipating similar or slightly warmer temps once again. High pressure will strengthen across intermountain region thereafter through midweek further warming temps within a drying/subsident environment. By Tuesday it looks like many areas along the Wasatch Front will again begin reaching or exceeding the triple digit mark. .LONG TERM (After 06Z Thursday)...The ridge axis is expected to shift just east of the forecast area by midweek, allowing for southerly flow to develop. This will draw moisture northward into the forecast area for the latter half of the week. GFS indicates PWs as high as 0.8 inch over southern Utah by Friday afternoon, with these values spreading northward over the upcoming weekend. This increasing moisture will combine with weak shortwaves moving through the flow to result in increasing coverage of showers and thunderstorms, primarily during the afternoon and evening. EC was previously a drier solution but has moved more toward the more consistent GFS in recent runs. Have indicated an increasing trend in POPs in the grids, and have overall bumped those POPs up a bit with increasing confidence. Temperatures will remain quite warm through the end of the forecast period, with maxes running around 10F above seasonal norms. Have indicated just a slight decrease in maxes next weekend with increasing moisture and expected associated cloud cover. && .AVIATION...VFR conditions will prevail at the SLC terminal through tonight. There is a 10 percent chance of virga showers or a thunderstorms in the vicinity of the terminal through 02z which could bring briefly erratic and stronger winds to the area. Otherwise, prevailing winds are expected to remain out of the northwest before switching to the southeast around 03-04z. && .FIRE WEATHER...A disturbance lifting northeast across central and eastern portions of the district this afternoon will continue to fire isolated showers and thunderstorms into mid evening, primarily over then central mtns/Uintas and Uinta Basin. With a bone dry boundary layer in place limited rainfall is expected keeping the wetting rain potential very low for all areas. Breezy southerly winds across the western valleys will remain in place into the evening hours as well, with localized gusts approaching critical thresholds for many valley areas south of I-70. This said, speeds are marginal and duration will be relatively short this afternoon precluding any RFW issuance. High pressure will strengthen across the region early next week bringing dry conditions and a further warming of temps through midweek. A modest monsoonal surge is expected to start sneaking in from the south Thursday, likely deepening through the weekend bringing an increased chance of thunderstorm activity, and localized wetting rains. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && SHORT TERM/FIRE WEATHER...Merrill LONG TERM...Traphagan AVIATION...Cheng For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity For frequently asked questions about the Area Forecast Discussion visit... http://weather.gov/saltlakecity/general/afd_faqs.php
The Salt Lake City radar (KMTX), 205 km away, was scanning. The volume nearest the first event began at 22:59 UTC.
2 thunderstorm wind. Local standard time, as filed.
The US-40 at Starvation sensor recorded a peak wind gust of 59 mph.
The UDOT sensor at Kimball Junction and I-80 recorded a maximum wind gust of 59 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2017Every state in 2017This day in weather historyWarnings in Utah, 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: 715660, 715663.