The airmass over Utah dried out a bit for the 2nd week of August, helping thunderstorms to produce stronger wind gusts across primarily western Utah.
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 SLC wrote it up.
The airmass over Utah dried out a bit for the 2nd week of August, helping thunderstorms to produce stronger wind gusts across primarily western Utah.
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 Aug 7, 9:16 AM MST, 3 hours 9 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 1016 AM MDT Mon Aug 7 2017 .SYNOPSIS...Weakening high pressure aloft centered over the Great Basin will lead to an increase in thunderstorm activity across mainly northern and central Utah for the first half of the week. && .DISCUSSION...A low-amplitude upper ridge across the interior west with an upstream trough over Oregon/northern California will maintain a west-southwest flow aloft across the Great Basin through midweek. PWAT values will remain somewhat elevated across the region, though values will show a modest decrease across the far south the next couple of days. Convective activity will likely concentrate across the northern and central portion of the state through midweek. The main driving force will be the various weak shortwaves ejecting out of the upper trough over northern California. One such feature moving into northeast Utah will produce light showers before exiting the area early this afternoon. A second feature will bring a few showers/isolated thunderstorms to northwest Utah late this morning and through the afternoon hours. Nocturnal convection will likely develop along a weak dynamic feature moving east-northeast out of Nevada and into west-central Utah this evening. Sufficient instability and dynamic lift will exist overnight through Tuesday morning to maintain convection northern and portions of central Utah. Northern Utah will likely become the most active area for convection late Tuesday/Tuesday night as the flow turns more westerly ahead of a somewhat stronger shortwave Tuesday night. Central and southern Utah will see convection, though this activity will be tied more closely to the terrain during the afternoon/early evening hours. A slight building of heights across southern/central Utah Wednesday will further reduce convection, and confine what develops to the higher terrain. Northern Utah/southwest Wyoming will remain the focus for convective activity as PWAT values remain elevated and subsequent shortwaves track east through the area. .AVIATION...Southerly winds at the SLC terminal are expected to shift to the northwest between 18-20Z. Convection is expected to develop and impact the Salt Lake area later this afternoon into this evening with a 30% chance of gusty and erratic outflow winds at the SLC terminal between 21-01Z. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && PUBLIC...CONGER AVIATION...KRUSE 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
Hazardous Weather Outlook National Weather Service Salt Lake City UT 527 AM MDT Mon Aug 7 2017 UTZ001>016-019>021-517-518-WYZ021-081300- Cache Valley/Utah Portion-Northern Wasatch Front- Salt Lake and Tooele Valleys-Southern Wasatch Front- Great Salt Lake Desert and Mountains-Wasatch Mountain Valleys- Wasatch Mountains I-80 North-Wasatch Mountains South of I-80- Western Uinta Mountains-Wasatch Plateau/Book Cliffs- Western Uinta Basin-Castle Country-San Rafael Swell- Sanpete/Sevier Valleys-West Central Utah-Southwest Utah- Utahs Dixie and Zion National Park-South Central Utah- Glen Canyon Recreation Area/Lake Powell-Central Mountains- Southern Mountains-Southwest Wyoming- 527 AM MDT Mon Aug 7 2017 This Hazardous Weather Outlook is for the western two thirds of Utah and southwest Wyoming. .DAY ONE...Today and Tonight Scattered to numerous showers and thunderstorms are expected across the central through northern outlook area this afternoon through this evening, while storms will be less numerous across the far south. Some of the storms could produce locally heavy rainfall. Gusty winds may emanate from the storms late this afternoon and evening. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorm coverage should become more confined to the northern portions of the outlook area Tuesday into Wednesday. Moisture could gradually return to the south by the weekend. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. For more information from NOAA/s National Weather Service visit... http://weather.gov/saltlakecity For information on potential road travel impacts visit... http://www.udottraffic.utah.gov/roadweatherforecast.aspx
The Cedar City radar (KICX), 92 km away, was scanning. The volume nearest the first event began at 19:26 UTC.
3 thunderstorm wind. Local standard time, as filed.
The Brimstone Reservoir RAWS recorded a maximum wind gust of 72 mph.
The Callao sensor in the U.S. Army Dugway Proving Ground mesonet recorded a peak wind gust of 59 mph.
A peak wind gust of 60 mph was recorded at the Causeway sensor in the U.S. Army Dugway Proving Ground mesonet.
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, August 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: 718994, 718995, 718997.