Very warm temperatures on still substantial snow in the Absaraoka Mountains lead to more flooding along the South Fork of the Shoshone River. 4 feet above flood stage at the flood gauge.
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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 RIW wrote it up.
Very warm temperatures on still substantial snow in the Absaraoka Mountains lead to more flooding along the South Fork of the Shoshone River. The river crested at 9.4 feet, about 0.4 feet above flood stage at the flood gauge. Flooding was largely confined to the low lands along the river and caused little damage.
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 Riverton, WY wrote its last area forecast discussion before the first event at Jun 17, 12:46 AM MST, 3 hours 14 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 146 AM MDT Sat Jun 17 2017 .SHORT TERM...Saturday through Monday night A cold front is currently moving through the area at this time. Most of the the lightning and thunder has ended but some rain showers will continue through the morning for many locations across the northern two thirds of the area. A few showers will linger into the morning hours as well. However, with ridging building across the area the coverage of showers should decrease through the day with all areas largely dry by mid afternoon. A thunderstorms or two may linger in the early afternoon as well, but these should be few and far between. However, clouds will linger across much of the area in the morning with increased sunshine through the afternoon. Temperatures should run about 5 to 10 degrees cooler than yesterday. As for wind, there will still be a gusty wind across southern portions and Johnson County but as a rule it should be less windy. Starting tonight, we will enter a quiet period of weather with ridging and dry northwest flow dominating the weather for the most part. Other than a gusty breeze in the west, tranquil weather is expected for Father's Day as well as Monday. Temperatures will also be on an upward trend with 80s returning to the lower elevations by Monday. .LONG TERM...Tuesday through Saturday Through the long term, the forecast area will be in a modest to strong westerly flow between a subtropical ridge over the Southern Rockies/S. Plains, and the main storm track over southern Canada/N. Rockies/Plains. On Tuesday and Wednesday, there will be enough instability for at least isolated mountain convection pushing into the adjacent foothills. A weak cold front could push into N. Wyoming Wednesday. The best shot for convection Tuesday and Wednesday appears to be across the northwest/northern mountains. Global models then show a more robust cold front pushing across the area Wednesday night/Thursday time frame with cooler, but with a drier airmass. The best cooling will be across N. WY with the least over the southwest with models limiting any chances of diurnal convection across the extreme north Thursday through Saturday for now. && .AVIATION...12Z Issuance WEST OF THE DIVIDE...KBPI/KJAC/KPNA/KRKS ROUTES Showers should be mostly out of the area by 12z Saturday. Partial clearing may result in local IFR-LIFR cigs and patchy fog vicinity KJAC-KBPI-KPNA until 14z. A drier northwest flow will prevail from NW-SE 14z-18z Saturday with isolated showers lingering over the mountains. VFR conditions and light wind will prevail Saturday night. EAST OF THE DIVIDE...KCOD/KCPR/KLND/KRIW/KWRL ROUTES An upper level disturbance and associated cold front will continue to bring scattered showers and a few thunderstorms across the area through 12z. Some lower MVFR ceilings may follow the front, mainly down the Interstate 25 corridor, vicinity KBYG-KCPR, through 14z Saturday. A drier NW flow will then prevail late Saturday morning through the afternoon with gusty surface north wind 10-20kts. Winds will diminish early Saturday evening with VFR conditions, unlimited ceilings, prevailing Saturday night. && .FIRE WEATHER... Expect a cooler day today following the passage of a cold front. A few showers will linger in the morning, but coverage should decrease through the day before ending by this evening. A gusty wind will continue across south and western Wyoming as well as portions of Johnson County. Relative humidity will remain above critical levels. Mixing and smoke dispersal will be generally good to very good. Dry weather will return Sunday and Monday along with gradually warming temperatures. && .RIW WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...Hattings LONG TERM...Murrell AVIATION...Meunier FIRE WEATHER...Hattings
Hazardous Weather Outlook National Weather Service Riverton WY 150 AM MDT Sat Jun 17 2017 WYZ001>020-022>030-181200- Yellowstone National Park-Absaroka Mountains-Cody Foothills- North Big Horn Basin-Southwest Big Horn Basin- Southeast Big Horn Basin-Owl Creek and Bridger Mountains- Bighorn Mountains West-Bighorn Mountains Southeast- Northeast Johnson County-Southeast Johnson County- Teton and Gros Ventre Mountains-Jackson Hole- Wind River Mountains West-Wind River Mountains East- Upper Wind River Basin-Wind River Basin-Lander Foothills- Green Mountains and Rattlesnake Range- Natrona County Lower Elevations-Casper Mountain-Star Valley- Salt River and Wyoming Ranges-Upper Green River Basin Foothills- Upper Green River Basin-South Lincoln County- Rock Springs and Green River-Flaming Gorge-East Sweetwater County- 150 AM MDT Sat Jun 17 2017 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight Isolated afternoon thunderstorms, mainly in the mountains. .DAYS TWO THROUGH SEVEN...Sunday through Friday Tuesday Through Thursday...Isolated mainly mountain afternoon and evening thunderstorms possible. Windy many areas Thursday. .SPOTTER INFORMATION STATEMENT...Spotters are urged to report hail and wind gusts past 45 mph. Team Riverton
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
The South Fork of the Shoshone River crested at around 9.4 feet on June 18th and June 21st. The flooding remained in the low lands around the river and caused little to no damage.
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: 700196.