Alert archive / Wyoming / Winter Storm Warnings in 2024
Winter Storm Warning 21, NWS Riverton, WY
NWS Riverton, WY issued this winter storm warning at Dec 15, 2024, 11:46 PM MST for 4 counties in Wyoming. It took effect at Dec 16, 2024, 11:00 AM MST. It was in force for 30 hr. 60 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Dec 15, 2024, 11:46 PM MST (06:46 UTC)
- In effect from
- Dec 16, 2024, 11:00 AM MST
- Expired
- Dec 17, 2024, 5:00 PM MST
- In force
- 30 hr
- Issued by
- NWS Riverton, WY
Counties Fremont County, WY, Lincoln County, WY, Sublette County, WY, Teton County, WY
The radar
The Riverton/Lander radar (KRIW), 120 km from the middle of the area, began a volume at 06:45 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 16, 3:00 PM MST | SNOW 1 | 11 N Dubois, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 1 | 3 W Boulder, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 1.8 | 11 Ne Marbleton, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 2 | 12 Nnw Shoshoni, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 3 | 16 E Moran Junction, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 3 | 1 Nne Pinedale, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 3 | 23 Nw Dubois, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 3.8 | 19 Ne Bondurant, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 3.8 | 5 Se Pinedale, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 4 | 1 Nnw Pinedale, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 4 | Kelly, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 5 | 16 Sw Dubois, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 5 | 22 E South Entrance, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 5 | 23 Ese Moran Junction, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 5 | 5 Nw Daniel, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 5.8 | 4 Ne Thayne, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 5.8 | 6 Wnw Cora, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6 | 15 Ene Cokeville, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6 | 17 Wnw South Pass City, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6 | 2 Nnw Turnerville, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6 | 2 Nw Teton Village, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6 | 2 Ssw Grant Village, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6 | South Entrance, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6.2 | 4 Nne Thayne, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6.2 | Afton, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6.4 | 2 S Bedford, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 6.5 | 1 Se Thayne, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 7 | 11 Nne Pinedale, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 7 | 12 Ese Bondurant, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 7 | 19 Ne Bondurant, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 7 | Jackson, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 7.5 | 1 Nne Pinedale, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 8 | 11 E Big Sandy, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 8 | 15 Nne Cokeville, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 8 | 1 Nne Jackson, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 8 | 1 S Jackson, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 8 | 20 Nw Calpet, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 8 | 3 N Etna, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 8 | 8 Nne Moran Junction, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 9 | 21 Ne Cokeville, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 9 | 2 Nne Teton Village, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 9 | 5 Ene Alta, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 9 | 6 Nnw Moose, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 10 | 10 Ene Turnerville, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 10 | 12 N Cora, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 10 | 14 E Bondurant, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 10 | 15 Ese Smoot, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 10 | 16 Ene Turnerville, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 10 | 20 E Bondurant, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 10 | 5 N South Entrance, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 10 | 6 Ene Smoot, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 10 | 8 S Smoot, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 11 | 3 Se Turnerville, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 11 | 5 Sse Smoot, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 11 | 6 E Alta, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 12 | 10 Ese Smoot, WY | Storm Total Snowfall. |
| Dec 16, 3:00 PM MST | SNOW 12 | 10 N Bondurant, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 12 | 16 Ene Turnerville, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 12 | 17 Ese Turnerville, WY | Storm total snowfall. |
| Dec 16, 3:00 PM MST | SNOW 12 | 3 Ssw Wilson, WY | Storm Total Snowfall. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 6.8 hours before the alert went out and 126 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2585 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
671 WWUS45 KRIW 160646 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1146 PM MST Sun Dec 15 2024 WYZ012-170015- /O.NEW.KRIW.WS.W.0021.241216T1800Z-241218T0000Z/ Teton and Gros Ventre Mountains- 1146 PM MST Sun Dec 15 2024 ...WINTER STORM WARNING IN EFFECT FROM 11 AM MONDAY TO 5 PM MST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations up to 2 feet for the Tetons and up to a foot for the Gros Ventres. * WHERE...Teton and Gros Ventre Mountains. * WHEN...From 11 AM Monday to 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. 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 . && $$ WYZ001-170015- /O.NEW.KRIW.WW.Y.0039.241216T1800Z-241218T0000Z/ Yellowstone National Park- Including the cities of Old Faithful, Lake, and Mammoth 1146 PM MST Sun Dec 15 2024 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM MONDAY TO 5 PM MST TUESDAY... * WHAT...Snow expected. Total snow accumulations over a foot for southwestern portions of the park with less than 6 inches possible from Mammoth Springs to Tower Junction. * WHERE...Yellowstone National Park. * WHEN...From 11 AM Monday to 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-170015- /O.NEW.KRIW.WW.Y.0039.241216T1800Z-241218T0000Z/ Jackson Hole- Including the cities of Jackson 1146 PM MST Sun Dec 15 2024 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM MONDAY TO 5 PM MST TUESDAY... * WHAT...Snow expected. Total snow accumulations between 4 and 8 inches. * WHERE...Jackson Hole. * WHEN...From 11 AM Monday to 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. 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 . && $$ WYZ024-170015- /O.NEW.KRIW.WW.Y.0039.241216T2000Z-241218T0000Z/ Salt River and Wyoming Ranges- 1146 PM MST Sun Dec 15 2024 ...WINTER WEATHER ADVISORY IN EFFECT FROM 1 PM MONDAY TO 5 PM MST TUESDAY... * WHAT...Snow expected. Total snow accumulations up to a foot. Winds gusting as high as 35 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...From 1 PM Monday to 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Monday evening and Tuesday morning commutes, including Salt River Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-170015- /O.NEW.KRIW.WW.Y.0039.241216T2200Z-241218T0000Z/ Wind River Mountains West- 1146 PM MST Sun Dec 15 2024 ...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM MONDAY TO 5 PM MST TUESDAY... * WHAT...Snow expected. Total snow accumulations up to a foot. Winds gusting as high as 35 mph. * WHERE...Wind River Mountains West. * WHEN...From 3 PM Monday to 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening and Tuesday morning commutes, including South Pass. 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Lowe
5 follow-up statements
762 WWUS45 KRIW 161923 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1223 PM MST Mon Dec 16 2024 WYZ024-171300- /O.UPG.KRIW.WW.Y.0039.241216T2000Z-241218T0000Z/ /O.EXB.KRIW.WS.W.0021.241216T2000Z-241218T0000Z/ Salt River and Wyoming Ranges- 1223 PM MST Mon Dec 16 2024 ...WINTER STORM WARNING IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations between 10 and 16 inches. Winds gusting as high as 40 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening and Tuesday morning commutes, including Salt River Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-171300- /O.UPG.KRIW.WW.Y.0039.241216T2200Z-241218T0000Z/ /O.EXB.KRIW.WS.W.0021.241216T2200Z-241218T0000Z/ Wind River Mountains West- 1223 PM MST Mon Dec 16 2024 ...WINTER STORM WARNING IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations between 10 and 16 inches. Winds gusting as high as 40 mph. * WHERE...Wind River Mountains West. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening and Tuesday morning commutes, including 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 . && $$ WYZ012-171300- /O.CON.KRIW.WS.W.0021.000000T0000Z-241218T0000Z/ Teton and Gros Ventre Mountains- 1223 PM MST Mon Dec 16 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations up to 2 feet for the Tetons and 10 to 18 inches for the Gros Ventres. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ023-171300- /O.EXB.KRIW.WW.Y.0039.241216T2000Z-241218T0000Z/ Star Valley- Including the cities of Star Valley Ranch, Afton, Thayne, and Alpine 1223 PM MST Mon Dec 16 2024 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Snow expected. Total snow accumulations between 4 and 8 inches. * WHERE...Star Valley. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. 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 . && $$ WYZ001-171300- /O.CON.KRIW.WW.Y.0039.000000T0000Z-241218T0000Z/ Yellowstone National Park- Including the cities of Mammoth, Lake, and Old Faithful 1223 PM MST Mon Dec 16 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Snow expected. Total snow accumulations over a foot for southwestern portions of the park with 2 to 6 inches near Old Faithful, and up to 1 to 3 inches from Mammoth to Tower Junction.. * WHERE...Yellowstone National Park. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-171300- /O.CON.KRIW.WW.Y.0039.000000T0000Z-241218T0000Z/ Jackson Hole- Including the cities of Jackson 1223 PM MST Mon Dec 16 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Snow expected. Total snow accumulations between 4 and 8 inches. * WHERE...Jackson Hole. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Dziewaltowski
950 WWUS45 KRIW 170655 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1155 PM MST Mon Dec 16 2024 WYZ012-180000- /O.CON.KRIW.WS.W.0021.000000T0000Z-241218T0000Z/ Teton and Gros Ventre Mountains- 1155 PM MST Mon Dec 16 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Heavy snow expected. Additional snow accumulations up to a foot for the Tetons and 6 to 10 inches for the Gros Ventres. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Tuesday morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-180000- /O.CON.KRIW.WS.W.0021.000000T0000Z-241218T0000Z/ Wind River Mountains West- 1155 PM MST Mon Dec 16 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Heavy snow expected. Additional snow accumulations between 6 and 10 inches. Winds gusting as high as 30 to 40 mph. * WHERE...Wind River Mountains West. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Tuesday morning commute, including 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 . && $$ WYZ024-180000- /O.CON.KRIW.WS.W.0021.000000T0000Z-241218T0000Z/ Salt River and Wyoming Ranges- 1155 PM MST Mon Dec 16 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Heavy snow expected. Additional snow accumulations between 6 and 10 inches. Winds gusting as high as 30 to 40 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Tuesday morning commute, including Salt River Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ001-180000- /O.CON.KRIW.WW.Y.0039.000000T0000Z-241218T0000Z/ Yellowstone National Park- Including the cities of Old Faithful, Lake, and Mammoth 1155 PM MST Mon Dec 16 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Snow expected. Additional snow accumulations up to 6 inches for southwestern portions of the park with 2 to 4 inches near Old Faithful, and up to 2 inches from Mammoth to Tower Junction. * WHERE...Yellowstone National Park. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Tuesday morning 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 . && $$ WYZ013-180000- /O.CON.KRIW.WW.Y.0039.000000T0000Z-241218T0000Z/ Jackson Hole- Including the cities of Jackson 1155 PM MST Mon Dec 16 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Snow. Additional snow accumulations between 2 and 4 inches. * WHERE...Jackson Hole. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Tuesday morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ023-180000- /O.CON.KRIW.WW.Y.0039.000000T0000Z-241218T0000Z/ Star Valley- Including the cities of Star Valley Ranch, Afton, Thayne, and Alpine 1155 PM MST Mon Dec 16 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST TUESDAY... * WHAT...Snow expected. Additional snow accumulations up to 2 inches. * WHERE...Star Valley. * WHEN...Until 5 PM MST Tuesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday morning 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Lowe
725 WWUS45 KRIW 172017 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 117 PM MST Tue Dec 17 2024 WYZ012-014-172130- /O.CAN.KRIW.WS.W.0021.000000T0000Z-241218T0000Z/ Teton and Gros Ventre Mountains-Wind River Mountains West- 117 PM MST Tue Dec 17 2024 ...WINTER STORM WARNING IS CANCELLED... The bulk of snowfall has come to an end. Light snow showers will linger through the evening into the morning hours on Wednesday. High elevations may see an additional 1 to 2 inches of snow accumulation by Wednesday morning. $$ WYZ001-013-172130- /O.CAN.KRIW.WW.Y.0039.000000T0000Z-241218T0000Z/ Yellowstone National Park-Jackson Hole- Including the cities of Lake, Old Faithful, Mammoth, and Jackson 117 PM MST Tue Dec 17 2024 ...WINTER WEATHER ADVISORY IS CANCELLED... The bulk of snowfall has come to an end. Light snow showers will linger through the evening into the morning hours on Wednesday. Most will see Little to no additional accumulation. $$ WYZ024-180000- /O.CON.KRIW.WS.W.0021.000000T0000Z-241218T0000Z/ Salt River and Wyoming Ranges- 117 PM MST Tue Dec 17 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations up to two inches. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ023-180000- /O.CON.KRIW.WW.Y.0039.000000T0000Z-241218T0000Z/ Star Valley- Including the cities of Alpine, Afton, Thayne, and Star Valley Ranch 117 PM MST Tue Dec 17 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow. Additional snow accumulations up to one inch. * WHERE...Star Valley. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Dziewaltowski
794 WWUS45 KRIW 180015 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 515 PM MST Tue Dec 17 2024 WYZ024-180115- /O.EXP.KRIW.WS.W.0021.000000T0000Z-241218T0000Z/ Salt River and Wyoming Ranges- 515 PM MST Tue Dec 17 2024 ...WINTER STORM WARNING HAS EXPIRED... Snow has generally ended across the area. Therefore, the Winter Storm Warning has expired. $$ WYZ023-180115- /O.EXP.KRIW.WW.Y.0039.000000T0000Z-241218T0000Z/ Star Valley- Including the cities of Afton, Star Valley Ranch, Alpine, and Thayne 515 PM MST Tue Dec 17 2024 ...WINTER WEATHER ADVISORY HAS EXPIRED... Snow has generally ended across the area. Therefore, the Winter Storm Warning has expired. $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Myers
568 WWUS45 KRIW 180029 CCA WSWRIW URGENT - WINTER WEATHER MESSAGE...CORRECTED National Weather Service Riverton WY 529 PM MST Tue Dec 17 2024 WYZ024-180130- /O.EXP.KRIW.WS.W.0021.000000T0000Z-241218T0000Z/ Salt River and Wyoming Ranges- 529 PM MST Tue Dec 17 2024 ...WINTER STORM WARNING HAS EXPIRED... Snow has generally ended across the area. Therefore, the Winter Storm Warning has expired. $$ WYZ023-180130- /O.COR.KRIW.WW.Y.0039.000000T0000Z-241218T0000Z/ Star Valley- Including the cities of Afton, Star Valley Ranch, Alpine, and Thayne 529 PM MST Tue Dec 17 2024 ...WINTER WEATHER ADVISORY HAS EXPIRED... Snow has generally ended across the area. Therefore, the Winter Weather Advisory has expired. $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Myers
What forecasters said that day
The local office's own words before this winter storm warning went out, 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 this winter storm warning went out at Dec 15, 9:48 PM MST, 1 hour 58 minutes earlier. Its key messages:
- Snow and wind continues today, with lessening impacts through the afternoon and evening.
- Another system Monday and Tuesday brings gusty winds or the Wind Corridor and western Wyoming snow.
- Warm and dry the second half the week.
Area forecast discussion, Dec 15, 9:48 PM MST, 1 hour 58 minutes before
Area Forecast Discussion National Weather Service Riverton WY 948 PM MST Sun Dec 15 2024 .KEY MESSAGES... - Snow and wind continues today, with lessening impacts through the afternoon and evening. - Another system Monday and Tuesday brings gusty winds or the Wind Corridor and western Wyoming snow. - Warm and dry the second half the week. && .DISCUSSION... Issued at 1055 AM MST Sun Dec 15 2024 Coming in this morning, snow amounts looked to be on track as of about 5am, with largely 8 to 12 inches over the western mountains. However, snow rates fell a bit more than expected over the western mountains during the morning, limiting some accumulations. As a result, western mountain totals may be slightly less than forecasted. Models did do a good job indicating a push of heavier snow mid-morning though, which should bring much of the remaining snow amounts for this storm. Snow rates will slowly decrease this afternoon, ending this evening. Snow over the Bighorn Mountains end by about midnight. For lower elevations outside the western valleys, little to nothing expected today. A possible shower may bring a few moments of snow, but a majority of people see nothing. The Casper area, as well as Johnson County, may be the exception as a cold front moves through this evening. Some snow (or rain/snow mix given temperatures) is possible between about 4pm and midnight. With temperatures relatively quickly dropping from the 40s to 20s in that timeframe, there could be some icy conditions, especially on overpasses and bridges, if precipitation does fall. The other weather element today is wind. Synoptic driven winds will continue through the afternoon and early evening, with widespread gusts 20 to 30 mph. Stronger winds are across the Wind Corridor. As the front passes this evening, a strong north wind moves through Johnson County. Given this favored flow, Buffalo is expected to see 30 to 40 mph winds. With the initial pass, gusts around 45 mph are expected. There is about a 20 percent chance for winds 50 to 55 mph. Gusty winds remain for the Wind Corridor and the mountains overnight and through the day Monday. A quick turn around after today's storm moves out and another system impacts the area Monday and Tuesday. Main impacts are once again to the western mountains, where an additional 8 to 12 inches are possible for the Tetons. The northern Salt/Wyoming Ranges and the Gros Ventres are more in the 6 to 10 range. Given current winter highlights, will not be issuing any products with this forecast package and will allow night shift to reevaluate snow amounts. The last flakes should fall Tuesday night, leaving a dry Wednesday across the area (outside maybe a few lingering light snow showers over the Tetons through Wednesday morning). Ridging will keep above normal temperatures and dry conditions across the area through the second half of the week, a similar pattern to what much of this season has seen so far. Conditions look warm and dry through December 22nd. Long range guidance is hinting at a system the 23rd, but very low confidence this far out. && .AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 945 PM MST Sun Dec 15 2024 West of the Divide...KBPI/KJAC/KPNA/KRKS Terminals. VFR conditions in place to start the TAF period. There is some indication for fog at KBPI, but confidence is not high on this and will just include a low scattered deck for now. The next system will follow quickly, moving into western Wyoming after 12Z. MVFR conditions are likely at KJAC before 18Z as snow redevelops. IFR/MVFR conditions become likely by 21Z. While ceilings will lower at KBPI and KPNA during the afternoon, snow impacts are largely expected to hold off until after 00Z Tuesday. IFR/MVFR conditions are then expected at these terminals by 03Z. East of the Divide...KCOD/KCPR/KLND/KRIW/KWRL Terminals. Gusty winds around 25 kt will continue at KCPR to begin the forecast. These winds will decrease by 09Z, before increasing again by 18Z. KCOD will also continue to have gusts around 20 kt through 12Z. VFR conditions are expected through the period. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on icing, and turbulence forecasts. && .RIW WATCHES/WARNINGS/ADVISORIES... None. && DISCUSSION...Wittmann AVIATION...LaVoie/Myers
Hazardous weather outlook, Dec 15, 1:10 AM MST, 22 hours 36 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 110 AM MST Sun Dec 15 2024 WYZ001>020-022>030-161215- Yellowstone National Park-Absaroka Mountains-Cody Foothills- North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn 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- 110 AM MST Sun Dec 15 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Light to moderate snow continues through much of the day tapering off west to east through the afternoon and evening hours. Gusty winds continue as well, highest for Natrona County. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The next storm system will bring another round of wind and snow for Monday night into Tuesday. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 11:46 PM MST | Winter Weather Advisory | RIW | Fremont, Lincoln, Park, Sublette, Teton | 41 hr |
Nearby
Winter Storm Warnings in Wyoming, 2024Every winter storm warning in 2024
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.