A thunderstorm produced strong winds across southwest Laramie County.
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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 CYS wrote it up.
A thunderstorm produced strong winds across southwest Laramie 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 Cheyenne, WY wrote its last area forecast discussion before the first event at Jul 7, 1:20 PM MST, 1 hour 55 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 220 PM MDT Fri Jul 7 2017 .SHORT TERM...(This evening through Sunday) Issued at 220 PM MDT Fri Jul 7 2017 Showers and a few storms confined mainly over the mtns so far this afternoon but they should increase in coverage into this evening and spread into the adjacent plains before dissipating later this evening. Activity will be aided by a weak shortwave that will move across the area this evening. Gusty winds should be the main threat from any storms. It will be continued quite warm over the weekend with an upper high centered over Utah and the CWA under northwesterly flow aloft on its front side. Expect to see less convection Saturday as the CWA looks to be behind the departing shortwave with some mid- level subsidence likely hindering convection. mainly dry saturday night into Sunday then convection should pop up again Sunday afternoon as another weak impulse approaches the area. .LONG TERM...(Sunday night through Friday) Issued at 220 PM MDT Fri Jul 7 2017 The large area of high pressure centered over the southwest will weaken a bit by Monday as a series of shortwaves move across the northern periphery of the ridge, bringing an increased chance of showers and thunderstorms to our region next week. Timing of the individual shortwaves will be difficult until we get into the near term, but for now have kept PoPs going in a typical diurnal cycle of afternoon/evening thunderstorms. Next week looks to be warm but not excessively warm as we have seen the past few days. && .AVIATION...(For the 18Z TAFS through 18Z Saturday afternoon) Issued at 1135 AM MDT Fri Jul 7 2017 VFR category expected to prevail across SE Wyoming and the western Nebraska Panhandle for the next 24 hours. We do have a mention of thunderstorm vicinity for Laramie and Cheyenne closer to where we will see thunderstorms initiate across the Snowy and Laramie mountain ranges with a general southeasterly movement off the higher terrain in the late afternoon and early evening hours. && .FIRE WEATHER... Issued at 220 PM MDT Fri Jul 7 2017 Scattered showers and thunderstorms will occur into this evening mainly around the mountains. Somewhat less activity is expected over the weekend into early next week before chances increase again and become more widespread by the middle of next week. Wetting rains will also become more likely by the middle of next week. Otherwise warm conditions will continue with winds mostly light outside of any thunderstorms. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && SHORT TERM...RE LONG TERM...JG AVIATION...JG FIRE WEATHER...RE
Hazardous Weather Outlook National Weather Service Cheyenne WY 604 AM MDT Fri Jul 7 2017 NEZ002-003-019>021-054-055-095-096-WYZ101>119-081215- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne- North Sioux-South Sioux-Converse County Lower Elevations- Niobrara County-North Laramie Range- Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-Central Carbon County- North Snowy Range Foothills-Southwest Carbon County- Sierra Madre Range-Upper North Platte River Basin-Snowy Range- Laramie Valley-South Laramie Range-South Laramie Range Foothills- Central Laramie County-East Laramie County- 604 AM MDT Fri Jul 7 2017 This hazardous weather outlook is for portions of western Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Isolated to scattered showers and thunderstorms are expected across southeast Wyoming and the western Nebraska Panhandle this afternoon through early evening. The greatest coverage of storms is expected along and west of the Laramie Range in southeast Wyoming. A few storms may be strong to locally severe, containing strong winds and hail. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation is not anticipated.
Special Weather Statement National Weather Service Cheyenne WY 350 PM MDT FRI JUL 7 2017 WYZ115-116-072230- South Laramie Range WY-Laramie Valley WY- 350 PM MDT FRI JUL 7 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN ALBANY COUNTY UNTIL 430 PM MDT... At 349 PM MDT, Doppler radar was tracking a strong thunderstorm over Tie City Campground, or 8 miles southeast of Laramie, moving south at 10 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Tie City Campground, Vedauwoo, Vedauwoo Campground, Yellow Pine Campground and The Buttes. This includes Interstate 80 in Wyoming between mile markers 319 and 332. PRECAUTIONARY/PREPAREDNESS ACTIONS... This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 4127 10553 4131 10536 4114 10532 4112 10558 TIME...MOT...LOC 2149Z 356DEG 9KT 4124 10545 Cox
Special Weather Statement National Weather Service Cheyenne WY 353 PM MDT FRI JUL 7 2017 WYZ116-117-072245- South Laramie Range WY-South Laramie Range Foothills WY- 353 PM MDT FRI JUL 7 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LARAMIE COUNTY UNTIL 445 PM MDT... At 352 PM MDT, Doppler radar was tracking a strong thunderstorm near Crystal Lake Campground, or 17 miles west of Cheyenne, moving east at 10 mph. Nickel size hail and wind gusts up to 50 mph will be possible with this storm. This storm will remain over mainly rural areas of southwestern Laramie County. This includes Interstate 80 in Wyoming between mile markers 342 and 352. PRECAUTIONARY/PREPAREDNESS ACTIONS... This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 4100 10519 4112 10519 4114 10499 4100 10499 TIME...MOT...LOC 2152Z 266DEG 9KT 4109 10513 Cox
The Cheyenne radar (KCYS), 22 km away, was scanning. The volume nearest the first event began at 22:16 UTC.
3 thunderstorm wind. Local standard time, as filed.
The WYDOT sensor near Otto Road measured a peak wind gust of 58 mph.
The wind sensor at FE Warren AFB measured peak wind gusts of 60 mph.
The WYDOT sensor at Wyoming Hill measured a peak wind gust of 58 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2017Every state in 2017This day in weather historyWarnings in Wyoming, 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: 702673, 702671, 702674.