A tight pressure gradient and strong mid level winds mixing to the surface brought high winds to portions of the Green and Rattlesnake Mountains. Some of the highest wind gusts were 66 mph at Camp Creek and 65 mph at Fales Rock.
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The episode as NWS RIW wrote it up.
A tight pressure gradient and strong mid level winds mixing to the surface brought high winds to portions of the Green and Rattlesnake Mountains. Some of the highest wind gusts were 66 mph at Camp Creek and 65 mph at Fales Rock.
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 13, 10:50 AM MST, 2 hours earlier.
Area Forecast Discussion National Weather Service Riverton WY 1150 AM MDT Tue Jun 13 2017 .SHORT TERM...(Today through Thursday night) Issued at 142 AM MDT Tue Jun 13 2017 Imagery shows large vigorous cold core closed trof across the wrn CONUS with the center now over ern ID/wrn WY. Strong jet from the Desert SW nosing into central Wyoming. SFC has a strong cyclone over nern CO with a frontal boundary stretching from this low to the northwest across ern WY to ncntrl WY. Deep shear associated with this set-up ranging from 35 to 55 kts. Severe thunderstorms have ended across the FA. However, precipitation associated with the upper low now moving through ern ID and into wrn WY this morning with snowfall or rain mixed with snow now above 7500 feet. Today and tonight, much more stable as a post frontal cold/cool pool overtakes the FA while the cold core low continues to move across the region. While SFC P Grads may not be quite as strong as those on Monday, flow aloft will be stronger with late morning to early evening low to mid adiabatic lapse rates strong enough to get some of those stronger winds to the ground. Therefore, another NPW for high wind has been issued for the wind corridor including zones 19, 20 and 30 (ern Sweetwater County through Natrona County) from 10 AM this morning through 9 PM this evening. Additionally, for the western mountains mainly above 7500 feet...a Winter WX Advisory will continue through 6 PM tonight as H& temps drop to between -3 and -5 today. This combined with precip totals from 0.5 to around an inch could produce snowfall totals ranging from 4 to 10 inches...locally to a foot in the Tetons. This could also briefly aggravate the high water situation for a day or so. Otherwise, outside of the mountain locations only a few isolated showers or storms are expected elsewhere for the most part...probably with little rainfall but gusty winds. Wednesday through Thursday night: Upper trof exits east and nearly zonal flow overtakes Wyoming with much drier weak high P across the region. Seasonally cool temperature are expected through the end of the forecast period with a few lower 80s only making it into the FCST by Thursday. No precip expected until until later Thursday late afternoon or evening across the northwest FA...even then coverage will be sparse. .LONG TERM...(Friday through Tuesday) Issued at 142 AM MDT Tue Jun 13 2017 Fairly flat zonal flow will be replaced by a building ridge over the Desert Southwest early next week. At least two shortwaves will move west to east across the Friday and Saturday leading to some shower/storm potential for at least the north half or so along with some gusty/strong west wind/nw wind with two frontal passages. After that, the warming trend begins Sunday but accelerates Monday into Tuesday. GFS is the most bullish with the temperatures early next week but all the models have H5 heights rising to over 590dm for at least sw Wyoming by Tuesday. Will not go to crazy with the temps at the end of the medium range but the GFS has +20C nosing into sern Sweetwater County and +18.5C all the way up to Riverton. The Euro is 'only' +16c here and +18 in sern Sweetwater. +15C equates to around 90 degrees at 5K feet. For now will show a solid warming trend with 85 to 90 in the south half and see how the trends are the next couple nights. Otherwise, we will have some shower/storm potential as mentioned for the west/north half with the Friday and Saturday shortwaves and a period of strong wind before the drying and warming starts Sunday and then accelerates Monday into Tuesday. Some hope this ridge may weaken some and allow some more at least weak disturbances to move through by the middle of next week so we'll see. && .AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon) Issued at 1150 AM MDT Tue Jun 13 2017 WEST OF THE DIVIDE...KBPI/KJAC/KPNA/KRKS TERMINALS Widespread mountain snow and even a mix of rain/snow across the far west, with mountains obscured through 12Z/Wed. Periods of MVFR and brief IFR conditions over western valleys with mountains obscurations expected over far west through about 03Z/Wed. Some showers moving over KRKS through about 20Z. Very windy westerly wind will be observed through 02Z/Wed. Improving conditions are expected in the evening, but some fog formation is possible at KJAC after midnight. Clearing skies Wednesday, though gusty westerly flow to pick up again before 18Z/Wed. EAST OF THE DIVIDE...KCOD/KCPR/KLND/KRIW/KWRL TERMINALS The main concern will be very windy west to southwest wind and/or LLWS with the most intense winds in the wind corridor from KRKS to KCPR and in the foothills (KCOD, KLND) especially this afternoon. However some windy conditions and LLWS will continue through the forecast period. Some convection is expected to form mainly over the mountains and adjacent foothills in the afternoon, but quickly diminish in the evening. Some showers may also develop around KWRL. Mountains to be obscured at times through 12Z/Wed. Gusty west wind to develop again before 18Z/Wed. Please see the Aviation Weather Center for the latest information on icing and turbulence forecasts. && .FIRE WEATHER... Issued AT 142 AM MDT Tue Jun 13 2017 All fuels are below critical levels and currently in green-up for all locations. Fire danger low across all mountain areas...but somewhat elevated over portions of southern and central WY that coincide with high winds expected today from eastern Sweetwater County through Natrona County. Winds will gust out of the southwest 40 to 60 mph today across the area of concern. Otherwise, expect widespread rain or snow across the western mountains with from 3 to 10 inches of snowfall possible above 7500 feet through today...with isolated showers or a thunderstorm across the lower elevations east of the Divide. Smoke dispersion will be good to excellent each afternoon and evening. && .RIW WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory until 6 PM MDT this evening for WYZ001- 002-012-014-015-024. High Wind Warning from 10 AM this morning to 9 PM MDT this evening for WYZ019-020-030. && SHORT TERM...Braun LONG TERM...Skrbac AVIATION...McDonald FIRE WEATHER...Braun
Hazardous Weather Outlook National Weather Service Riverton WY 230 AM MDT Tue Jun 13 2017 WYZ001>020-022>030-141200- 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- 230 AM MDT Tue Jun 13 2017 ...Flood Warnings for the Green and Wind River Basins Continue Through Mid-Week... ...High Wind Warning Until 9 PM This Evening for portions of southern and central Wyoming... ...Winter Weather Advisory for Western Wyoming through today... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight Heavy wet snowfall likely in the the northern and western mountains, including Grand Teton and Yellowstone National Parks. Snowfall, slushy roads and limited visibility likely over mountain passes at times. Very windy across southern and central forecast areas. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Friday and Saturday...Isolated thunderstorms each day, mainly during the afternoon and evening. .SPOTTER INFORMATION STATEMENT...Please report wind speeds greater than 50 mph, any flooding, and snow and rainfall amounts. Thank you. Team Riverton
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
Wind gusts of 66 and 65 mph were reported at the RAWS sites at Camp Creek and Fales Rock respectively.
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: 705676.