A cool and wet winter and spring built up abnormally large snow pack across the Wind River Range. Warmer weather in June caused rapid melting of the snow and resulted in flooding along the North and Middle Forks of the Popo Agie Rivers for several weeks.
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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.
A cool and wet winter and spring built up abnormally large snow pack across the Wind River Range. Warmer weather in June caused rapid melting of the snow and resulted in flooding along the North and Middle Forks of the Popo Agie Rivers for several weeks. In Lander, the Lander Brewfest had to moved from City Park to another location. High waters also caused flooding of the low lying areas around Hudson. However, in Hudson ample preparation from the weeks before kept the water out of homes. The waters receded around June 22nd as water levels dropped below flood stage.
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 3, 9:54 AM MST, 2 hours 6 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 1054 AM MDT Sat Jun 3 2017 .SHORT TERM...(Today through Monday night) Issued at 122 AM MDT Sat Jun 3 2017 The mid level circulation has progressed to Northeast Wyoming and has taken its clouds and isold showers with it. After a spring season characterized by unsettles weather and lots of rain and snowfall, we will wake up to summer this morning. An amplifying ridge of high pressure will be building in from the west through Saturday night. Today temperatures will warm by 5 to 10 degrees over Friday. By Sunday, H7 temps will warm to 15C which will result in the warmest day of the year so far in many areas with the Wind River Basin/Casper warming to the upper 80s to near 90 along with low to mid 90s in the Big Horn Basin on Sunday with these hot temperatures continuing through Monday east of the Divide. West of the Divide, we can look forward to 80s in Sweetwater County Sunday and Monday along with 80 at the lower elevations in the far west, cooling to near 70 by Monday as a cold front tracks southeast across Wyoming. Going back to Sunday afternoon, we can expect to see some isold afternoon and evening thunderstorms over the mtns, especially in the west where the best capes will be underneath an increasingly southwesterly difluent flow on the backside of the ridge. With light steering winds, these few t cells will be mountain huggers. The aforementioned cool front on Monday, along with a trailing shortwave trough swinging across the area from wsw to ene slung by a strong Pacific Northwest vort center will result in scattered afternoon and evening thunderstorms, especially in Johnson, Natrona, and eastern Fremont counties where the best capes/cape gradient is progged. The sfc low that will sling the sfc front across the area will likely slide southeast across Johnson County, another reason for more activity there with resultant sfc convergence. These storms will dissipate after midnight Monday night. The significant warm up expected this weekend and early next week is expected to accelerate snow melt and increase river stages along main stem rivers. .LONG TERM...(Tuesday through Saturday) Issued at 122 AM MDT Sat Jun 3 2017 Overview...A ridge of high pressure will continue to bring above normal temperatures through Thursday. Isolated thunderstorms will be found mainly across the north and east. Strengthening southwest flow ahead of a Pacific trough may bring hot and windy conditions, near record high temperatures on Friday into Saturday. Flooding will remain a primary concern at least into the middle portion of the week or until a good portion of the existing snowpack is melted off. Discussion...Medium-range global models in good overall agreement with synoptic features through Saturday. On Tuesday, surface high pressure over the northern High Plains will bring a relatively cooler easterly upslope flow across central Wyoming, with best moisture and instability across southeast Wyoming into Natrona and Southern Johnson counties. Upper ridge will amplify over the area on Wednesday and Thursday with warmer air aloft and light wind. Lee side surface trough across the north and east will be the focus for isolated thunderstorms with a drier, more stable airmass across the south and west. Unseasonably cold upper low dives south out of the Gulf of Alaska, bottoming out along the northwest coast on Friday. Upper ridge translates to the Plains with strengthening southwest flow over Wyoming. H7 temperatures are forecast in the 16c-18c range that would put lower basin highs into the mid 90s. The upper low is expected to slowly progress eastward across the Intermountain West next weekend, with associated Pacific cold front pushing into the northwest on Saturday. The front will bring some showers and thunderstorms into Grand Teton and Yellowstone National Parks on Saturday, while windy and hot conditions will likely persist across the central and south. The pattern looks to transition to wetter and much cooler conditions in the latter part of next weekend, with some snow possible in the mountains. && .AVIATION...18Z Issuance VFR and dry conditions with mainly light winds are expected through the forecast period. Increasing high level cloudiness is expected tonight. Model sounding are also hinting at some weak southerly Low- level wind shear at CPR tonight. Isolated showers and thunderstorms may return on Sunday but will hold off until after 18Z. && .FIRE WEATHER... Issued AT 122 AM MDT Sat Jun 3 2017 Temperatures will warm with lowering relative humidity down to the mid teens and increased southwest wind through Monday. Saturday should be dry with isolated convection bringing showers and thunderstorms mainly to the mountains Sunday and Monday. The warming and increased wind will accelerate the melting of the exceptional snowpack with increased flooding threats. && .RIW WATCHES/WARNINGS/ADVISORIES... Flood Watch through late Sunday night for WYZ002-016>018-025-026. && SHORT TERM...Lipson LONG TERM...Meunier AVIATION...Hattings FIRE WEATHER...Lipson
Hazardous Weather Outlook National Weather Service Riverton WY 247 AM MDT Sat Jun 3 2017 WYZ001>020-022>030-041100- 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- 247 AM MDT Sat Jun 3 2017 ...Flood Watch Remains In Effect Along the Green, Wind and Shoshone River Basins through Sunday Night... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight Potential for some flooding to develop along creeks, streams and rivers due to rapid mountain snowmelt. .DAYS TWO THROUGH SEVEN...Sunday through Friday Potential for some flooding continues along creeks, streams and rivers due to rapid mountain snowmelt. Sunday through Thursday...Isolated to scattered afternoon and evening thunderstorms, mainly across the north and east. and in the mountains. Friday...Hot, dry and windy conditions across much of the area will result in elevated fire danger. .SPOTTER INFORMATION STATEMENT... Please report any flooding. TEAM RIVERTON
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
The Little Popo Agie River rose above flood stage for a few weeks. For safety reasons, the Lander Brewfest was moved from City Park. However, flooding caused little or no property damage.
Near Hudson, the Little Pop Agie River rose above flood stage for a few weeks. However, a flood wall that had been constructed in the previous weeks held and only some low lying areas flooded. As a result, there was little or no property 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: 704186, 704200.