Alert archive / Wyoming / Winter Storm Warnings in 2017
Winter Storm Warning 13, NWS Riverton, WY
NWS Riverton, WY issued this winter storm warning at Apr 19, 2017, 11:07 PM MDT for 5 counties in Wyoming. It took effect at Apr 21, 2017, 12:00 AM MDT. It was in force for 27 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 19, 2017, 11:07 PM MDT (05:07 UTC)
- In effect from
- Apr 21, 2017, 12:00 AM MDT
- Expired
- Apr 22, 2017, 2:58 AM MDT
- In force
- 27 hr
- Issued by
- NWS Riverton, WY
Counties Big Horn County, WY, Fremont County, WY, Johnson County, WY, Natrona County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 103 km from the middle of the area, began a volume at 05:13 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.
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 5.1 hours before the alert went out and 98 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
- 19 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1770 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.2
The text
As transmitted.
870 WWUS45 KRIW 200507 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1107 PM MDT Wed Apr 19 2017 ...Another significant snowfall event slated for much of the Northern and Central Mountains for Thursday night through Friday night... .The combination of a strong upper Pacific trough modest lee side cyclogenesis will produce significant amounts of snowfall over portions of the Absaroka, Wind River, and Big Horn Mountains from Thursday night through Friday night. WYZ014-200615- /O.CAN.KRIW.WS.A.0016.170421T0000Z-170422T0600Z/ Wind River Mountains West- 1107 PM MDT Wed Apr 19 2017 ...WINTER STORM WATCH IS CANCELLED... The National Weather Service in Riverton has cancelled the Winter Storm Watch. Heaviest snowfall with this weather system will occur across the eastern Wind River Mountains...with lesser amounts over the Western Wind River Mountains. Therefore the Winter Storm Watch has been cancelled for the western Wind River Mountains. $$ WYZ008-009-201000- /O.UPG.KRIW.WS.A.0016.170421T0600Z-170422T1200Z/ /O.NEW.KRIW.WS.W.0013.170421T0600Z-170422T1200Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 1107 PM MDT Wed Apr 19 2017 ...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT THURSDAY NIGHT TO 6 AM MDT SATURDAY... The National Weather Service in Riverton has issued a Winter Storm Warning for Heavy Snow, which is in effect from midnight Thursday night to 6 AM MDT Saturday. The Winter Storm Watch is no longer in effect. * TIMING...Snow showers will generally begin after midnight Thursday night with the snow levels starting out above 8500 feet. After midnight Thursday night, the snow levels should lower to around 7500 feet by sun up then down to 6500 feet through Friday morning. Heaviest snowfall expected between midnight Thursday and midnight Friday. * TOTAL SNOW ACCUMULATION...4 to 8 inches between 6500 feet and 7500 feet...8 to 14 inches from 7500 feet to 9000 feet...and 14 to 18 inches above 9000 feet. * MAIN IMPACT...Highways may become slick and snow packed including Highway 16 over Powder River Pass and Highway 14 over Granite Pass. Visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter storm warning means significant amounts of snow, and or blowing snow are expected or occurring. This could make travel very hazardous or impossible. If you must travel keep some food, water, and an extra flashlight in your vehicle in case of an emergency. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ015-201000- /O.UPG.KRIW.WS.A.0016.170421T0000Z-170422T0600Z/ /O.NEW.KRIW.WW.Y.0024.170421T0000Z-170422T0600Z/ Wind River Mountains East- 1107 PM MDT Wed Apr 19 2017 ...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THURSDAY TO MIDNIGHT MDT FRIDAY NIGHT... The National Weather Service in Riverton has issued a Winter Weather Advisory for snow, which is in effect from 6 PM Thursday to midnight MDT Friday night. The Winter Storm Watch is no longer in effect. * TIMING...Snow showers will begin late Thursday afternoon with the snow levels starting out above 8500 feet. After midnight Thursday, the snow levels will lower to around 7500 feet, then down to 6500 feet through Friday morning. * TOTAL SNOW ACCUMULATION...6 to 12 inches possible with locally higher amounts. * MAIN IMPACT...Highways may become slick and snow packed, including South Pass and Togwotee Pass. Visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ002-201000- /O.UPG.KRIW.WS.A.0016.170421T0000Z-170422T0600Z/ /O.NEW.KRIW.WW.Y.0024.170421T0000Z-170422T0600Z/ Absaroka Mountains- 1107 PM MDT Wed Apr 19 2017 ...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THURSDAY TO MIDNIGHT MDT FRIDAY NIGHT... The National Weather Service in Riverton has issued a Winter Weather Advisory for snow, which is in effect from 6 PM Thursday to midnight MDT Friday night. The Winter Storm Watch is no longer in effect. * TIMING...Snow showers will begin by Thursday evening with the snow levels starting out above 9000 feet. After midnight Thursday, the snow levels will lower to around 7000 fee...then on down to 5500 feet through Friday morning. * TOTAL SNOW ACCUMULATION...6 to 12 inches with local amounts up to 16 inches possible. * MAIN IMPACT...Highways may become slick and snow packed including Highway 14 16 20 west out of Cody as well as the Chief Joseph Highway or Highway 296. Visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ003-201000- /O.NEW.KRIW.WW.Y.0024.170421T0300Z-170422T0600Z/ Cody Foothills- Including the cities of Cody and Meeteetse 1107 PM MDT Wed Apr 19 2017 ...WINTER WEATHER ADVISORY IN EFFECT FROM 9 PM THURSDAY TO MIDNIGHT MDT FRIDAY NIGHT... The National Weather Service in Riverton has issued a Winter Weather Advisory for snow, which is in effect from 9 PM Thursday to midnight MDT Friday night. * TIMING...Snow showers will begin after 3 am...becoming heavy by around sun up. * TOTAL SNOW ACCUMULATION...2 to 6 inches with local amounts up to 8 inches possible. * MAIN IMPACT...Area highways may become slushy or snow packed including Highways 14 16 and 20 west out of Cody. Visibility may lower to around 1/2 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$
8 follow-up statements
627 WWUS45 KRIW 200718 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 118 AM MDT Thu Apr 20 2017 ...Another significant snowfall event slated for much of the Northern and Central Mountains for tonight through Friday night... .The combination of a strong upper Pacific trough modest lee side cyclogenesis will produce significant amounts of snowfall over portions of the Absaroka, Wind River, and Big Horn Mountains from tonight through Friday night. WYZ008-009-202200- /O.CON.KRIW.WS.W.0013.170421T0600Z-170422T1200Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 118 AM MDT Thu Apr 20 2017 ...WINTER STORM WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM MDT SATURDAY... * TIMING...Snow showers will generally begin after midnight tonight with the snow levels starting out above 8500 feet. After midnight tonight, the snow levels should lower to around 7500 feet by sun up then down to 6500 feet through Friday morning. Heaviest snowfall expected between midnight tonight and midnight Friday. * TOTAL SNOW ACCUMULATION...4 to 8 inches between 6500 feet and 7500 feet...8 to 14 inches from 7500 feet to 9000 feet...and 14 to 18 inches above 9000 feet. * MAIN IMPACT...Highways may become slick and snow packed including Highway 16 over Powder River Pass and Highway 14 over Granite Pass. Visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter storm warning means significant amounts of snow, and or blowing snow are expected or occurring. This could make travel very hazardous or impossible. If you must travel keep some food, water, and an extra flashlight in your vehicle in case of an emergency. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ003-202200- /O.EXT.KRIW.WW.Y.0024.170421T0900Z-170422T0600Z/ Cody Foothills- Including the cities of Cody and Meeteetse 118 AM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 3 AM FRIDAY TO MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Snow showers will begin after 3 am Friday morning... becoming moderate to heavy by around sun up. * TOTAL SNOW ACCUMULATION...2 to 6 inches with local amounts up to 8 inches possible. * MAIN IMPACT...Area highways may become slushy or snow packed including Highways 14 16 and 20 west out of Cody. Visibility may lower to around 1/2 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ015-202200- /O.CON.KRIW.WW.Y.0024.170421T0000Z-170422T0600Z/ Wind River Mountains East- 118 AM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Snow showers will begin late this afternoon with the snow levels starting out above 8500 feet. After midnight tonight, the snow levels will lower to around 7500 feet, then down to 6500 feet through Friday morning. * TOTAL SNOW ACCUMULATION...6 to 12 inches possible with locally higher amounts. * MAIN IMPACT...Highways may become slick and snow packed, including South Pass and Togwotee Pass. Visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ002-202200- /O.CON.KRIW.WW.Y.0024.170421T0000Z-170422T0600Z/ Absaroka Mountains- 118 AM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Snow showers will begin by this evening with the snow levels starting out above 9000 feet. After midnight tonight, the snow levels will lower to around 7000 fee...then on down to 5500 feet through Friday morning. * TOTAL SNOW ACCUMULATION...6 to 12 inches with local amounts up to 16 inches possible. * MAIN IMPACT...Highways may become slick and snow packed including Highway 14 16 20 west out of Cody as well as the Chief Joseph Highway or Highway 296. Visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$
166 WWUS45 KRIW 202046 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 246 PM MDT Thu Apr 20 2017 ...Another significant snowfall event slated for much of the Northern and Central Mountains for tonight through Friday night... .The combination of a strong upper Pacific trough modest lee side cyclogenesis will produce significant amounts of snowfall over portions of the Absaroka, Wind River, and Big Horn Mountains from tonight through Friday night. WYZ008-009-211000- /O.CON.KRIW.WS.W.0013.170421T0600Z-170422T1200Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 246 PM MDT Thu Apr 20 2017 ...WINTER STORM WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM MDT SATURDAY... * TIMING...Snow showers will generally begin after midnight tonight with the snow levels starting out above 8500 feet. After midnight tonight, the snow levels should lower to around 7500 feet by sun up then down to 6500 feet through Friday morning. Heaviest snowfall expected between midnight tonight and midnight Friday. * TOTAL SNOW ACCUMULATION...4 to 8 inches between 6500 feet and 7500 feet...8 to 14 inches from 7500 feet to 9000 feet...and 14 to 18 inches above 9000 feet. * MAIN IMPACT...Highways may become slick and snow packed including Highway 16 over Powder River Pass and Highway 14 over Granite Pass. Visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter storm warning means significant amounts of snow, and or blowing snow are expected or occurring. This could make travel very hazardous or impossible. If you must travel keep some food, water, and an extra flashlight in your vehicle in case of an emergency. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ007-211000- /O.EXA.KRIW.WW.Y.0024.170421T0000Z-170422T0600Z/ Owl Creek and Bridger Mountains- 246 PM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO MIDNIGHT MDT FRIDAY NIGHT... The National Weather Service in Riverton has issued a Winter Weather Advisory for the Owl Creek Mountains, which is in effect from 6 PM this evening to midnight MDT Friday night. * TIMING...Snow showers will begin late this afternoon with the snow levels starting out above 8500 feet. After midnight tonight, the snow levels will lower to around 7000 feet, then down to 5500 feet through Friday morning. * TOTAL SNOW ACCUMULATION...6 to 12 inches possible with locally higher amounts of up to 15 inches over the highest ridges. * MAIN IMPACT...Area highways may become muddy, slick and snow packed, including Nowood Road connecting the towns of Lysite, Lost Cabin, and Big Trails. The visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ015-211000- /O.CON.KRIW.WW.Y.0024.170421T0000Z-170422T0600Z/ Wind River Mountains East- 246 PM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Snow showers will begin late this afternoon with the snow levels starting out above 8500 feet. After midnight tonight, the snow levels will lower to around 7500 feet, then down to 6500 feet through Friday morning. * TOTAL SNOW ACCUMULATION...6 to 12 inches possible with locally higher amounts. * MAIN IMPACT...Highways may become slick and snow packed, including South Pass and Togwotee Pass. Visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ002-211000- /O.CON.KRIW.WW.Y.0024.170421T0000Z-170422T0600Z/ Absaroka Mountains- 246 PM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Snow showers will begin this evening with the snow levels starting out above 9000 feet. After midnight tonight, the snow levels will lower to around 7000 fee...then on down to 5500 feet through Friday morning. * TOTAL SNOW ACCUMULATION...6 to 12 inches with local amounts up to 16 inches possible. * MAIN IMPACT...Highways may become slick and snow packed including Highway 14 16 20 west out of Cody as well as the Chief Joseph Highway or Highway 296. Visibility may lower to around 1/4 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ003-211000- /O.CON.KRIW.WW.Y.0024.170421T0900Z-170422T0600Z/ Cody Foothills- Including the cities of Cody and Meeteetse 246 PM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 AM FRIDAY TO MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Rain showers will begin after 10 pm this evening, turning to snow by 3 am Friday morning over the hilly terrain surrounding Cody, and then turning to snow in Cody by 5 am. Snow becoming moderate to heavy by sun up Friday morning. * TOTAL SNOW ACCUMULATION...2 to 6 inches with local amounts up to 8 inches possible. * MAIN IMPACT...Area highways may become slushy or snow packed including Highways 14 16 and 20 west out of Cody. Visibility may lower to around 1/2 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ TEAM RIVERTON
916 WWUS45 KRIW 210330 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 930 PM MDT Thu Apr 20 2017 ...Significant snowfall for the Northern and Central Mountains as well as Cody Foothills tonight through Friday night... .Another spring storm will bring significant precipitation to areas along and east of the Divide late tonight through Friday night. The precipitation is expected to begin as rain in the valleys tonight, but change over to snow down to around 5000 feet Friday morning with the quickest change over occurring in the Cody Foothills. Significant amounts of snowfall are expected over the Absaroka, Wind River, and Bighorn Mountains as well as the Cody Foothills. The heaviest snowfall amounts are expected over the Bighorn Mountains where the snow is expected to linger through much of Friday night. WYZ008-009-211130- /O.CON.KRIW.WS.W.0013.170421T0600Z-170422T1200Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 930 PM MDT Thu Apr 20 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY... * TIMING...Snow will develop between midnight and 6 AM Friday. Periods of snow, heavy at times, will then continue through Friday night. * TOTAL SNOW ACCUMULATION...8 to 14 inches with higher amounts above 9000 feet. * MAIN IMPACT...Powder River and Granite mountain passes will become slick and snow packed. Visibility will be under a quarter mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter storm warning means significant amounts of snow, and or blowing snow are expected or occurring. This could make travel very hazardous or impossible. If you must travel keep some food, water, and an extra flashlight in your vehicle in case of an emergency. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ015-211130- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Wind River Mountains East- 930 PM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Periods of snow through Friday evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches possible with locally higher amounts. * MAIN IMPACT...South Pass may become slick and snow packed, including South Pass. Visibility may lower to around 1/2 of a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ002-211130- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Absaroka Mountains- 930 PM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Periods of snow, heavy a times, will continue through Friday evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches with local amounts up to 16 inches possible. * MAIN IMPACT...Highways will become slick and snow covered, including Chief Joseph Highway, and the highway between Pahaska and Cody. Visibility will be under a quarter mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ007-211130- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Owl Creek and Bridger Mountains- 930 PM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Periods of snow, heavy at times, will impact the Owl Creek and Bridger Mountains through Friday evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches possible with locally higher amounts of up to 15 inches over the highest ridges. * MAIN IMPACT...Area highways may become muddy, slick and snow packed, including Nowood Road connecting the towns of Lysite, Lost Cabin, and Big Trails. Visibility will be under a quarter mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ003-211130- /O.CON.KRIW.WW.Y.0024.170421T0900Z-170422T0600Z/ Cody Foothills- Including the cities of Cody and Meeteetse 930 PM MDT Thu Apr 20 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 AM FRIDAY TO MIDNIGHT MDT FRIDAY NIGHT... * TIMING...Rain developing over the Cody Foothills is expected to change over to snow in most areas between 3 AM and 8 AM. * TOTAL SNOW ACCUMULATION...2 to 6 inches with local amounts up to 8 inches possible. The highest amounts are expected to occur between Cody and Meeteetse. * MAIN IMPACT...Highway 120 will likely become slick and hazardous at times especially during heavier bursts of heavy snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ Team Riverton/21
773 WWUS45 KRIW 210758 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 158 AM MDT Fri Apr 21 2017 ...Significant snowfall for the Northern and Central Mountains as well as Cody Foothills through tonight... .Another spring storm will bring significant precipitation to areas along and east of the Divide through tonight. The precipitation should begin as rain in the valleys early this morning, but change over to snow down to around 5000 feet with the quickest change over occurring in the Cody Foothills. Significant amounts of snowfall are expected over the Absaroka, Wind River, and Bighorn Mountains as well as the Cody Foothills. The heaviest snowfall amounts are expected over the Bighorn Mountains where the snow is expected to linger through tonight. WYZ008-009-212200- /O.CON.KRIW.WS.W.0013.000000T0000Z-170422T1200Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 158 AM MDT Fri Apr 21 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY... * TIMING...Snow should develop before dawn and continue, heavy at times through tonight. * TOTAL SNOW ACCUMULATION...8 to 14 inches with higher amounts above 9000 feet. * MAIN IMPACT...Powder River and Granite mountain passes will become slick and snow packed. Visibility will be under a quarter mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter storm warning means significant amounts of snow, and or blowing snow are expected or occurring. This could make travel very hazardous or impossible. If you must travel keep some food, water, and an extra flashlight in your vehicle in case of an emergency. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ015-212200- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Wind River Mountains East- 158 AM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Periods of snow through this evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches possible with locally higher amounts. * MAIN IMPACT...South Pass may become slick and snow packed, including South Pass. Visibility may lower to around half a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ002-212200- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Absaroka Mountains- 158 AM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Periods of snow, heavy a times, continuing through this evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches with local amounts up to 16 inches possible. * MAIN IMPACT...Highways will become slick and snow covered, including Chief Joseph Highway, and the highway between Pahaska and Cody. Visibility will be under a quarter mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ003-212200- /O.CON.KRIW.WW.Y.0024.170421T0900Z-170422T0600Z/ Cody Foothills- Including the cities of Cody and Meeteetse 158 AM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Rain beginning over the Cody Foothills is expected to change over to snow in most areas by 8 AM. * TOTAL SNOW ACCUMULATION...2 to 5 inches with local amounts up to 8 inches possible. The highest amounts are expected to occur between Cody and Meeteetse. * MAIN IMPACT...Highway 120 will likely become slick and hazardous at times especially during heavier bursts of heavy snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ007-212200- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Owl Creek and Bridger Mountains- 158 AM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Periods of snow, heavy at times, will impact the Owl Creek and Bridger Mountains through this evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches. * MAIN IMPACT...Area highways may become muddy, slick and snow packed, including Nowood Road connecting the towns of Lysite, Lost Cabin, and Big Trails. Visibility will be under a half mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$
340 WWUS45 KRIW 211905 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 105 PM MDT Fri Apr 21 2017 ...Significant snowfall for the Northern and Central Mountains as well as Cody Foothills through tonight... .Another spring storm will bring significant precipitation to areas along and east of the Divide through tonight. Significant amounts of snowfall are expected over the Absaroka, Wind River, and Bighorn Mountains as well as the Cody Foothills. The heaviest snowfall amounts are expected over the Bighorn Mountains where the snow is expected to linger through tonight. WYZ008-009-220600- /O.CON.KRIW.WS.W.0013.000000T0000Z-170422T1200Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 105 PM MDT Fri Apr 21 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY... * TIMING...Snow should continue, heavy at times through tonight. * TOTAL SNOW ACCUMULATION...8 to 14 inches with higher amounts above 9000 feet. * MAIN IMPACT...Powder River and Granite mountain passes will become slick and snow packed. Visibility will be under a quarter mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter storm warning means significant amounts of snow, and or blowing snow are expected or occurring. This could make travel very hazardous or impossible. If you must travel keep some food, water, and an extra flashlight in your vehicle in case of an emergency. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ015-220600- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Wind River Mountains East- 105 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Periods of snow through this evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches possible with locally higher amounts. * MAIN IMPACT...South Pass may become slick and snow packed, including South Pass. Visibility may lower to around half a mile in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ002-220600- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Absaroka Mountains- 105 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Periods of snow, heavy a times, continuing through this evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches with local amounts up to 16 inches possible. * MAIN IMPACT...Highways will become slick and snow covered, including Chief Joseph Highway, and the highway between Pahaska and Cody. Visibility will be under a quarter mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ003-220600- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Cody Foothills- Including the cities of Cody and Meeteetse 105 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...P:eriods of snow through the evening hours. * TOTAL SNOW ACCUMULATION...2 to 5 inches with local amounts up to 8 inches possible. The highest amounts are expected to occur between Cody and Meeteetse. * MAIN IMPACT...Highway 120 will likely become slick and hazardous at times especially during heavier bursts of heavy snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ007-220600- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Owl Creek and Bridger Mountains- 105 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Periods of snow, heavy at times, will impact the Owl Creek and Bridger Mountains through this evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches. * MAIN IMPACT...Area highways may become muddy, slick and snow packed, including Nowood Road connecting the towns of Lysite, Lost Cabin, and Big Trails. Visibility will be under a half mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$
714 WWUS45 KRIW 212236 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 436 PM MDT Fri Apr 21 2017 ...Significant Snowfall continues for the Northern and Central Mountains Tonight... .Scattered to numerous mountain snow showers will gradually end from west to east tonight as a spring storm lifts northeast away from the area later tonight. WYZ003-212345- /O.CAN.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Cody Foothills- Including the cities of Cody and Meeteetse 436 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY IS CANCELLED... The National Weather Service in Riverton has cancelled the Winter Weather Advisory. Snow has changed to rain across much of the Cody Foothills this afternoon. The rain could change back to snow late this evening, but additional snow accumulations will be half an inch or less. Roads should be mainly wet, but some black ice could form later tonight, mainly over bridges, as temperatures fall to just below freezing. Thus the winter weather advisory for the Cody Foothills has been cancelled, but the winter weather advisory for the Absaroka Mountains continues through midnight. $$ WYZ008-009-220645- /O.CON.KRIW.WS.W.0013.000000T0000Z-170422T1200Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 436 PM MDT Fri Apr 21 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY... * TIMING...Snow should continue, heavy at times through tonight. * SNOWFALL THROUGH NOON...3 to 6 inches. * TOTAL SNOW ACCUMULATION...8 to 14 inches with higher amounts above 9000 feet. * MAIN IMPACT...Powder River and Granite mountain passes will be slick and hazardous especially at pass level. Reduced visibility could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter storm warning means significant amounts of snow, and or blowing snow are expected or occurring. This could make travel very hazardous or impossible. If you must travel keep some food, water, and an extra flashlight in your vehicle in case of an emergency. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ015-220600- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Wind River Mountains East- 436 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Periods of snow through this evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches possible with locally higher amounts. * MAIN IMPACT...South Pass may become slick at times this evening with visibility around half mile at times in heavier snowfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ002-220600- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Absaroka Mountains- 436 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Periods of snow, heavy at times, continuing through this evening. * SNOWFALL TOTALS THROUGH NOON...4 to 8 inches with isolated areas around a foot. * TOTAL SNOW ACCUMULATION...6 to 12 inches with local amounts up to 16 inches possible. * MAIN IMPACT...Chief Joseph Highway will be slick and hazardous in spots. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ WYZ007-220600- /O.CON.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Owl Creek and Bridger Mountains- 436 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... * TIMING...Periods of snow, heavy at times, will impact the Owl Creek and Bridger Mountains through this evening. * TOTAL SNOW ACCUMULATION...6 to 12 inches. * MAIN IMPACT...Visibility will be under a half mile in heavier snow, which could be very disorientating for those recreating in the back country. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ Team Riverton/21
254 WWUS45 KRIW 220538 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1138 PM MDT Fri Apr 21 2017 ...Significant Snowfall continues for the Northern and Central Mountains Tonight... .Scattered to numerous mountain snow showers will gradually end from west to east tonight as a spring storm lifts northeast away from the area later tonight. WYZ015-220645- /O.EXP.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Wind River Mountains East- 1138 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY WILL EXPIRE AT MIDNIGHT MDT TONIGHT... Snow continues to taper off, and little or no additional snow accumulation is expected tonight over the Wind River Mountains. Thus the winter weather advisory will be allowed to expire at midnight. $$ WYZ002-220645- /O.EXP.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Absaroka Mountains- 1138 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY WILL EXPIRE AT MIDNIGHT MDT TONIGHT... Snow continues to taper off, and little or no additional snow accumulation is expected tonight over the Absaroka Mountains. Thus the winter weather advisory will be allowed to expire at midnight. $$ WYZ007-220645- /O.EXP.KRIW.WW.Y.0024.000000T0000Z-170422T0600Z/ Owl Creek and Bridger Mountains- 1138 PM MDT Fri Apr 21 2017 ...WINTER WEATHER ADVISORY WILL EXPIRE AT MIDNIGHT MDT TONIGHT... Snow continues to taper off, and additional snow accumulations will be light over the Owl Creek and Bridger Mountains. Thus the winter weather advisory will be allowed to expire at midnight. $$ WYZ008-009-221200- /O.CON.KRIW.WS.W.0013.000000T0000Z-170422T1200Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 1138 PM MDT Fri Apr 21 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY... * TIMING...Light to moderate snow will continue for the rest of the night decreasing to very light snow or flurries by around sunrise. * SNOWFALL TOTALS THROUGH 6 PM FRIDAY...4 to 8 inches. * TOTAL SNOW ACCUMULATION...8 to 14 inches with higher amounts above 9000 feet. * MAIN IMPACT...Powder River and Granite mountain passes will be slick and hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter storm warning means significant amounts of snow, and or blowing snow are expected or occurring. This could make travel very hazardous or impossible. If you must travel keep some food, water, and an extra flashlight in your vehicle in case of an emergency. Check the latest road conditions at wyoroad.info or by dialing 5 1 1. && $$ Team Riverton/21
290 WWUS45 KRIW 220858 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 258 AM MDT Sat Apr 22 2017 WYZ008-009-221000- /O.CAN.KRIW.WS.W.0013.000000T0000Z-170422T1200Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 258 AM MDT Sat Apr 22 2017 ...WINTER STORM WARNING IS CANCELLED... The National Weather Service in Riverton has cancelled the Winter Storm Warning. The snow has decreased since midnight and little additional snow is expected overnight. Thus, the winter storm warning has been cancelled. $$
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 6:50 PM MDT | Special Weather Statement | RIW | Fremont | 25 min |
| Apr 19, 7:33 PM MDT | Special Weather Statement | RIW | 27 min | |
| Apr 19, 7:58 PM MDT | Special Weather Statement | RIW | 32 min | |
| Apr 19, 11:07 PM MDT | Winter Weather Advisory | RIW | Fremont, Hot Springs, Natrona, Park, Sublette | 49 hr |
Nearby
Winter Storm Warnings in Wyoming, 2017Every winter storm warning in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.