Thunderstorms produced two to four inches of rain over north central Laramie County, which resulted in 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 CYS wrote it up.
Thunderstorms produced two to four inches of rain over north central Laramie County, which resulted in 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 Cheyenne, WY wrote its last area forecast discussion before the first event at Jun 1, 12:28 PM MST, 3 hours 2 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 128 PM MDT Thu Jun 1 2017 .SHORT TERM...(This evening through Saturday night) Issued at 230 PM MDT Thu Jun 1 2017 Tonight...As our team expected, scattered showers and thunderstorms continue to erupt over our western counties, along and west of a Douglas to Cheyenne line. Current and expected instability and shear values suggest that the storms should remain sub-severe, though a few storms with small hail and gusty winds would not be too surprising through early evening. Will continue with our current forecast of isolated to scattered showers and thunderstorms this evening, decreasing in coverage after 9 pm, with a few residual showers remaining after midnight. Friday...Shortwave trough aloft moves into the western Dakotas and western Nebraska in the late afternoon with a low level surface trough or cold front moving to the east of our counties in the afternoon, thus severely limiting chances for showers and thunderstorms over our counties as drying occurs in the low levels. Still though, will continue with a low chance for showers and thunderstorms north of a Lusk to Alliance line with isolated thunderstorms over the mountains. Slightly cooler and drier. Friday night...Expect a dry night with limited cloud cover as low and mid level moisture decreases. Also, a bit cooler than Thursday night with less cloud cover. Saturday...Relatively dominant ridging and warm temperatures aloft prevail over our region with light southerly surface winds. Thus, no showers and thunderstorms expected. Temperatures slightly warmer than Friday with a moderating airmass and warmer temperatures aloft. Compromised between the NAM and GFS MOS maximums for high temperatures. Saturday night...Continued dry with minimal low and mid level moisture. .LONG TERM...(Sunday through Thursday) Issued at 230 PM MDT Thu Jun 1 2017 Upper ridge overhead Sunday with 700mb temperatures increasing to +16C over Carbon County. Going to be warm Sunday with 80s west of the Laramie Range and near 90s out in the Panhandle. Ridge axis moves east Monday with an upper low tracking through Montana Monday afternoon. Going to see convection increasing Monday afternoon as associated cold front approaches from the west. Front moves through the CWFA Tuesday morning. Another active afternoon Tuesday with fairly widespread showers and thunderstorms. Another upper ridge Wednesday to bring back warmer and drier air to the area into Friday. && .AVIATION...(For the 18Z TAFS through 18Z Friday afternoon) Issued at 1107 AM MDT Thu Jun 1 2017 Convective activity shifted west of the Laramie Range today as eastern sections under high pressure. KLAR and KRWL will see the biggest impacts today with the convection. Used HRRR guidance on timing of convection this afternoon. Airports east of the Laramie Range should stay dry today. && .FIRE WEATHER... Issued at 230 PM MDT Thu Jun 1 2017 Minimal concerns based on expected humidities and winds. && .HYDROLOGY... Issued at 230 PM MDT Thu Jun 1 2017 Warm temperatures will continue to increase snowmelt above 9000 feet through the weekend. High temperatures will be above normal through Sunday, with low temperatures staying well above freezing. This will result in highly efficient snowmelt and rising creeks and main stem rivers. The Upper North Platte River at Saratoga may rise to near action stage over the next few days. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && SHORT TERM...RUBIN LONG TERM...GCC AVIATION...GCC FIRE WEATHER...RUBIN HYDROLOGY...GCC
Hazardous Weather Outlook National Weather Service Cheyenne WY 319 AM MDT Thu Jun 1 2017 WYZ101>119-020930- 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- 319 AM MDT Thu Jun 1 2017 This hazardous weather outlook is for portions of east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Isolated to scattered showers and thunderstorms will develop this afternoon across portions of southeast Wyoming. No severe storms are expected, however gusty winds will be possible. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY Thunderstorms may return to the region Monday through Wednesday. .Spotter information statement... Spotter activation will not be needed. NEZ002-003-019>021-054-055-095-096-020930- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne- North Sioux-South Sioux- 319 AM MDT Thu Jun 1 2017 This hazardous weather outlook is for portions of western Nebraska. .DAY ONE...TODAY AND TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY Isolated to scattered thunderstorms will be possible on Friday afternoon into the evening. Severe storms are not expected. Thunderstorms may return to the region Monday through Wednesday. .Spotter information statement... Spotter activation will not be needed.
Special Weather Statement National Weather Service Cheyenne WY 422 PM MDT THU JUN 1 2017 WYZ108-012300- Goshen County WY- 422 PM MDT THU JUN 1 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN GOSHEN COUNTY UNTIL 500 PM MDT... At 422 PM MDT, Doppler radar was tracking strong thunderstorms along a line extending from Hawk Springs Recreation Area to 12 miles southwest of Hawk Springs. Movement was northeast at 10 mph. Dime size hail and wind gusts of 50 to 55 mph will be possible with these storms. Strong thunderstorms will be near... Hawk Springs Recreation Area and Hawk Springs Campground around 425 PM MDT. Hawk Springs around 445 PM MDT. LAT...LON 4183 10408 4182 10462 4169 10454 4171 10414 TIME...MOT...LOC 2222Z 204DEG 7KT 4173 10418 4170 10448 Rubin
The Cheyenne radar (KCYS), 50 km away, was scanning. The volume nearest the first event began at 22:29 UTC.
1 flash flood. Local standard time, as filed.
At least six inches of water was flowing over County Roads 128, 234 and 238.
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, June 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: 713643.