Alerts from NWS Riverton WY (UNOFFICIAL)
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riw.nws-bot.us
Alerts from NWS Riverton WY (UNOFFICIAL)
@riw.nws-bot.us
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Unofficial bot sharing alerts from NWS Riverton WY.

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riw.nws-bot.us
RIW issues Area Forecast Discussion (AFD) at Dec 5, 4:14 AM MST
at Fri, 05 Dec 2025 11:14:54 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 11:27 AM
riw.nws-bot.us
RIW issues Hazardous Weather Outlook (HWO) at Dec 5, 2:54 AM MST ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... via IEMbot
Additional Details Here.
December 5, 2025 at 10:07 AM
riw.nws-bot.us
🚨 Winter Storm Warning issued December 5 at 12:44AM MST until December 6 at 2:00PM MST by NWS Riverton WY 🚨
Additional Details Here.(2/2)
* WHAT...Snow expected. Additional snow accumulations of 6 to 8 inches toward Bondurant/Hoback Junction; amounts of 2 to 4 inches near Pinedale. Additional snow accumulations of 10 to 20 inches in the mountains. Gusty winds of 20 to 35 mph across the Upper Green River Basin and west Wind River Mountains, and up to 45 mph across the highest elevations. Wind gusts as high as 45 mph over South Pass Friday night. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between a Trace and 3 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty west winds of 20 to 35 mph are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow.
December 5, 2025 at 8:00 AM
riw.nws-bot.us
🚨 Winter Storm Warning issued December 5 at 12:44AM MST until December 6 at 2:00PM MST by NWS Riverton WY 🚨
Additional Details Here.
(1/2)
* WHAT...Heavy snow expected. Additional snow accumulations of 10 to 20 inches with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. Higher elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between 1 and 5 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the snow accumulations will occur. Gusty west winds of 25 to 40 mph, and possibly above 45 mph across higher elevations, occur after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. * WHAT...Snow expected. Additional snow accumulations of 4 to 8 inches; accumulations of 10 to 15 inches at the South and Northeast entrances and near Pahaska; locally higher amounts of 20 to 25 inches in the higher elevations in the Pitchstone Plateau and the western slopes of the Absarokas. Gusty winds of 20 to 35 mph across Yellowstone National Park and 30 to 50 mph across the Absaroka Mountains. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between 1 and 4 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty winds are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. * WHAT...Snow expected. Additional snow accumulations of 8 to 15 inches from Cloud Peak and Granite Pass northward. Snow amounts of 1 to 5 inches south of Powder River Pass. * WHERE...Bighorn Mountains West. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between 1 and 3 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. * WHAT...Snow expected. Additional snow accumulations of 4 to 8 inches, with locally higher amounts of 9 to 14 inches in the foothill areas. Gusty winds of 20 to 25 mph. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between 1 and 3 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty west winds of 20 to 25 mph are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow.
December 5, 2025 at 8:00 AM
riw.nws-bot.us
WORLAND WY Dec 4
Climate Report:
High: 42
Low: 9
Precip: 0.0"
Snow: Missing
at Fri, 05 Dec 2025 07:41:00 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 7:47 AM
riw.nws-bot.us
GREYBULL WY Dec 4
Climate Report:
High: 39
Low: 15
Precip: 0.0"
Snow: Missing
at Fri, 05 Dec 2025 07:41:00 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 7:47 AM
riw.nws-bot.us
LAKE YELLOWSTONE WY Dec 4
Climate Report:
High: 21
Low: 16
Precip: 0.2"
Snow: Missing
at Fri, 05 Dec 2025 07:41:01 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 7:47 AM
riw.nws-bot.us
RIW continues Winter Weather Advisory for Upper Green River Basin Foothills, Wind River Mountains West [WY] till Dec 6, 2:00 PM MST
at Fri, 05 Dec 2025 07:44:52 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 7:47 AM
riw.nws-bot.us
RIW issues Area Forecast Discussion (AFD) at Dec 4, 9:55 PM MST
at Fri, 05 Dec 2025 04:55:23 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 5:07 AM
riw.nws-bot.us
RIVERTON WY Dec 4
Climate Report:
High: 39
Low: 15
Precip: 0.0"
Snow: Missing
at Fri, 05 Dec 2025 00:55:31 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 1:07 AM
riw.nws-bot.us
LANDER WY Dec 4
Climate Report:
High: 41
Low: 11
Precip: 0.0"
Snow: Missing
at Fri, 05 Dec 2025 00:55:31 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 1:07 AM
riw.nws-bot.us
RIW issues Area Forecast Discussion (AFD) at Dec 4, 4:00 PM MST
at Thu, 04 Dec 2025 23:00:48 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 11:07 PM
riw.nws-bot.us
RIW issues Area Forecast Discussion (AFD) at Dec 4, 1:16 PM MST
at Thu, 04 Dec 2025 20:16:13 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 8:27 PM
riw.nws-bot.us
🚨 Winter Storm Warning issued December 4 at 12:29PM MST until December 6 at 2:00PM MST by NWS Riverton WY 🚨
Additional Details Here.(2/2)
* WHAT...Snow expected. Total snow accumulations 6 to 9 inches toward Bondurant/Hoback Junction; amounts of 2 to 4 inches near Pinedale. Accumulations of 10 to 18 inches in the mountains. Winds gusting as high as 45 mph over South Pass Friday night. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult through Hoback Junction. The hazardous conditions could impact the Thursday evening and Friday morning commutes.
December 4, 2025 at 7:45 PM
riw.nws-bot.us
🚨 Winter Storm Warning issued December 4 at 12:29PM MST until December 6 at 2:00PM MST by NWS Riverton WY 🚨
Additional Details Here.
(1/2)
* WHAT...Heavy snow expected. Total snow accumulations of 12 to 20 inches across much of the area with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. Higher elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds of 20 to 30 mph look to accompany the heavy snowfall which may create reduced visibility and drifting snow. * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches; accumulations of 10 to 15 inches at the South and Northeast entrances and near Pahaska; locally higher amounts of 20 to 30 inches in the higher elevations in the Pitchstone Plateau and the western slopes of the Absarokas. Winds gusting as high as 45 mph over the Absarokas through the period. Gusts as high as 35 mph in Yellowstone NP Friday night. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday evening and Friday morning commutes. * WHAT...Snow expected. Total snow accumulations of 10 to 18 inches from Cloud Peak and Granite Pass northward. Minimal snowfall amounts south of Powder River Pass. * WHERE...Bighorn Mountains West. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult over Granite and Powder River Passes. The hazardous conditions could impact the Thursday evening and Friday morning commutes. * WHAT...Snow expected. Total snow accumulations between 5 and 10 inches, with locally higher amounts of 12 to 16 inches in the foothill areas. * WHERE...Jackson Hole and Star Valley. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday evening and Friday morning commutes.
December 4, 2025 at 7:45 PM
riw.nws-bot.us
RIW issues Area Forecast Discussion (AFD) at Dec 4, 11:07 AM MST
at Thu, 04 Dec 2025 18:07:34 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 6:07 PM
riw.nws-bot.us
🚨 Winter Storm Warning issued December 4 at 5:17AM MST until December 6 at 2:00PM MST by NWS Riverton WY 🚨
Additional Details Here.(2/2)
* WHAT...Snow expected. Total snow accumulations 6 to 9 inches toward Bondurant/Hoback Junction; amounts of 2 to 4 inches near Pinedale. Accumulations of 8 to 16 inches in the mountains. Winds gusting as high as 45 mph over South Pass Friday night. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult through Hoback Junction. The hazardous conditions could impact the Thursday evening and Friday morning commutes.
December 4, 2025 at 12:30 PM
riw.nws-bot.us
🚨 Winter Storm Warning issued December 4 at 5:17AM MST until December 6 at 2:00PM MST by NWS Riverton WY 🚨
Additional Details Here.
(1/2)
* WHAT...Heavy snow expected. Total snow accumulations of 12 to 20 inches across much of the area with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. Higher elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds of 20 to 30 mph look to accompany the heavy snowfall which may create reduced visibility and drifting snow. * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches; accumulations of 10 to 15 inches at the South and Northeast entrances and near Pahaska; locally higher amounts of 1 to 2 feet in the higher elevations in the Pitchstone Plateau and the western slopes of the Absarokas. Winds gusting as high as 45 mph over the Absarokas through the period. Gusts as high as 35 mph in Yellowstone NP Friday night. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday evening and Friday morning commutes. * WHAT...Snow expected. Total snow accumulations of 8 to 16 inches from Cloud Peak and Granite Pass northward. Minimal snowfall amounts south of Powder River Pass. * WHERE...Bighorn Mountains West. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult over Granite Pass. The hazardous conditions could impact the Thursday evening and Friday morning commutes. * WHAT...Snow expected. Total snow accumulations between 7 and 12 inches, with locally higher amounts up to 18 inches in the foothill areas. * WHERE...Jackson Hole and Star Valley. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday evening and Friday morning commutes.
December 4, 2025 at 12:30 PM
riw.nws-bot.us
RIW continues Winter Weather Advisory valid at Dec 4, 5:00 PM MST for Jackson Hole, Star Valley [WY] till Dec 6, 2:00 PM MST
at Thu, 04 Dec 2025 12:17:40 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 12:27 PM
riw.nws-bot.us
RIW issues Hazardous Weather Outlook (HWO) at Dec 4, 4:56 AM MST ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... via IEMbot
Additional Details Here.
December 4, 2025 at 12:07 PM
riw.nws-bot.us
RIW issues Area Forecast Discussion (AFD) at Dec 4, 4:13 AM MST
at Thu, 04 Dec 2025 11:14:08 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 11:27 AM
riw.nws-bot.us
RIW issues Area Forecast Discussion (AFD) at Dec 4, 3:45 AM MST
at Thu, 04 Dec 2025 10:45:46 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 10:47 AM
riw.nws-bot.us
RIW continues Winter Storm Warning valid at Dec 4, 5:00 PM MST for Salt River and Wyoming Ranges, Teton and Gros Ventre Mountains [WY] till Dec 6, 2:00 PM MST
at Thu, 04 Dec 2025 09:37:08 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 9:47 AM
riw.nws-bot.us
🚨 Winter Storm Warning issued December 4 at 2:37AM MST until December 6 at 2:00PM MST by NWS Riverton WY 🚨
Additional Details Here.
* WHAT...Heavy snow expected. Total snow accumulations of 12 to 20 inches across much of the area with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. High elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds of 20 to 30 mph look to accompany the heavy snowfall which may create reduced visibility and drifting snow. * WHAT...Snow expected. Total snow accumulations of 6 to 10 inches for Jackson Valley, Star Valley, and the Upper Green River Basin. Total snow accumulations of 8 to 12 inches across Yellowstone National Park, the Absarokas, western Wind River Mountains, and the northern portions of the western Bighorns are expected with the highest elevations potentially seeing up to 20 inches. Winds gusts between 30 and 40 mph will be common across the Absarokas with isolated gusts above 45 mph. * WHERE...Portions of central, north central, northwest, and west central Wyoming. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could become very difficult, including through Hoback Canyon. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds look to accompany the heavy snowfall which may create reduced visibility and drifting snow.
December 4, 2025 at 9:45 AM
riw.nws-bot.us
🚨 Winter Storm Warning issued December 4 at 2:22AM MST until December 6 at 2:00PM MST by NWS Riverton WY 🚨
Additional Details Here.
* WHAT...Heavy snow expected. Total snow accumulations of 12 to 20 inches across much of the area with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. High elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds of 20 to 30 mph look to accompany the heavy snowfall which may create reduced visibility and drifting snow.
December 4, 2025 at 9:30 AM