022 WWUS45 KRIW 181642 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1042 AM MDT Mon May 18 2026 WYZ002-003-005-007>011-181745- /O.CAN.KRIW.WW.Y.0019.000000T0000Z-260519T0000Z/ Absaroka Mountains-Cody Foothills-Southwest Bighorn Basin-Owl Creek and Bridger Mountains-Bighorn Mountains West-Bighorn Mountains Southeast-Northeast Johnson County-Southeast Johnson County- Including the cities of Buffalo, Kaycee, Meeteetse, Thermopolis, Cody, and Clark 1042 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IS CANCELLED... Conditions have improved, with only minimal impacts remaining. Conditions continue to improve through the rest of today. Therefore, the Advisories are cancelled. $$ WYZ015-190000- /O.CON.KRIW.WS.W.0005.000000T0000Z-260519T0000Z/ Wind River Mountains East- 1042 AM MDT Mon May 18 2026 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Heavy snow. Additional snow accumulations up to 2 inches, with 4 to 6 inches at the highest elevations. Winds gusting as high as 40 mph. * WHERE...Wind River Mountains East. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel will be very difficult, especially over South Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ018-190000- /O.CON.KRIW.WS.W.0005.000000T0000Z-260519T0000Z/ Lander Foothills- Including the cities of Lander 1042 AM MDT Mon May 18 2026 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Snow expected. Additional snow accumulations up to 3 inches, with higher amounts near Sinks Canyon Park. * WHERE...Lander Foothills. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult. Heavy snow could break tree limbs as many trees have leafed out. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ019-190000- /O.CON.KRIW.WS.W.0005.000000T0000Z-260519T0000Z/ Green Mountains and Rattlesnake Range- Including the cities of Jeffrey City 1042 AM MDT Mon May 18 2026 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Heavy snow. Additional snow accumulations 1 to 5 inches. Winds gusting as high as 50 mph. * WHERE...Green Mountains and Rattlesnake Range. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel will be difficult due to a combination of wind and falling snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ020-190000- /O.CON.KRIW.WS.W.0005.000000T0000Z-260519T0000Z/ Natrona County Lower Elevations- Including the cities of Casper 1042 AM MDT Mon May 18 2026 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Heavy snow expected. Total snow accumulations between 1 and 3 inches. Areas of higher amounts up to 4 inches between Hiland and Casper and for the south side of Casper. Winds gusting as high as 40 mph. * WHERE...Natrona County Lower Elevations. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel will be difficult, especially along US Highway 20/26 between Hiland and Casper. Heavy snow could break tree limbs as many trees have leafed out. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ022-190000- /O.CON.KRIW.WS.W.0005.000000T0000Z-260519T0000Z/ Casper Mountain- 1042 AM MDT Mon May 18 2026 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Heavy snow possible. Additional snow accumulations between 3 and 6 inches possible. Winds could gust as high as 40 mph. * WHERE...Casper Mountain. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel will be very difficult. Areas of blowing snow could significantly reduce visibility. Heavy snow could break tree limbs as many trees have leafed out. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ030-190000- /O.CON.KRIW.WS.W.0005.000000T0000Z-260519T0000Z/ East Sweetwater County- Including the cities of Wamsutter 1042 AM MDT Mon May 18 2026 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Heavy snow expected. Additional snow accumulations between 1 and 3 inches. Lower amounts up to 1 inch in the Rock Springs area. Winds gusting as high as 60 mph. * WHERE...East Sweetwater County. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel will be very difficult, especially along Interstate 80 due to the crosswind component. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-190000- /O.CON.KRIW.WW.Y.0019.000000T0000Z-260519T0000Z/ Wind River Mountains West- 1042 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Snow expected. Additional snow accumulations between 3 and 5 inches. Winds gusting as high as 60 mph. * WHERE...Wind River Mountains West. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult, especially along South Pass. The hazardous conditions could impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ016-017-190000- /O.CON.KRIW.WW.Y.0019.000000T0000Z-260519T0000Z/ Upper Wind River Basin-Wind River Basin- Including the cities of Shoshoni, Riverton, and Dubois 1042 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Snow expected. Additional snow accumulations up to 2 inches. Winds gusting as high as 45 mph. * WHERE...Upper Wind River Basin and Wind River Basin. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult due to a combination of snow and wind. Where heavy snow occurs, it is possible for tree limbs to break, as many trees have leafed out. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ026-190000- /O.CON.KRIW.WW.Y.0019.000000T0000Z-260519T0000Z/ Upper Green River Basin- Including the cities of Big Piney, La Barge, and Farson 1042 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Snow expected. Total snow accumulations up to 2 inches. Winds gusting as high as 45 mph. * WHERE...Upper Green River Basin. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult due to a combination of wind and falling snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ027-190000- /O.CON.KRIW.WW.Y.0019.000000T0000Z-260519T0000Z/ South Lincoln County- Including the cities of Cokeville and Kemmerer 1042 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Snow expected. Additional snow accumulations between up to 2 inches. Winds gusting as high as 40 mph. * WHERE...South Lincoln County. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult due to a combination of wind and falling snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ028-029-190000- /O.CON.KRIW.WW.Y.0019.000000T0000Z-260519T0000Z/ Rock Springs and Green River-Flaming Gorge- Including the cities of Green River and Rock Springs 1042 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Snow expected. Additional snow accumulations up to 1 inch. Winds gusting as high as 55 mph. * WHERE...Flaming Gorge and Rock Springs and Green River. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult, especially along Interstate 80. The hazardous conditions could impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Wittmann  443 WWUS45 KGJT 181651 WSWGJT URGENT - WINTER WEATHER MESSAGE National Weather Service Grand Junction CO 1051 AM MDT Mon May 18 2026 COZ004-190300- /O.CON.KGJT.WW.Y.0014.000000T0000Z-260519T0300Z/ Elkhead and Park Mountains- Including the cities of Columbine, Hahns Peak, and Toponas 1051 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING ABOVE 9500 FEET... * WHAT...Snow expected above 9500 feet. Total snow accumulations between 5 to 10 inches. Wind gusts as high as 35 mph. * WHERE...Elkhead and Park Mountains. * WHEN...Until 9 PM MDT this evening. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ UTZ023-190000- /O.CON.KGJT.WW.Y.0014.000000T0000Z-260519T0000Z/ Eastern Uinta Mountains- Including the cities of Manila and Dutch John 1051 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Moderate to heavy snow at times total snow accumulations between 6 and 12 inches. Wind gusts up to 40 mph. * WHERE...Eastern Uinta Mountains. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Travel could be difficult at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ BGB