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Home Return to list Freeze Warning 0003 Issued by the Cheyenne Forecast Office
Action: New Issued At: 2026-05-19 12:40:54 924 WWUS75 KCYS 191740 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 1140 AM MDT Tue May 19 2026 WYZ104-105-109>111-201200- /O.EXP.KCYS.FZ.W.0002.000000T0000Z-260519T1800Z/ /O.UPG.KCYS.FZ.A.0002.260520T0300Z-260520T1600Z/ /O.NEW.KCYS.FZ.W.0003.260520T0300Z-260520T1600Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County- Including the cities of Rawlins, Baggs, Medicine Bow, Seminoe Dam, Elk Mountain, Arlington, and Shirley Basin 1140 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 10 AM MDT WEDNESDAY... ...FREEZE WARNING WILL EXPIRE AT NOON MDT TODAY... * WHAT...Sub-freezing temperatures between 15 and 25 degrees expected. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, and Southwest Carbon County. * WHEN...From 9 PM this evening to 10 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ113-116-201200- /O.UPG.KCYS.FZ.A.0002.260520T0300Z-260520T1600Z/ /O.NEW.KCYS.FZ.W.0003.260520T0300Z-260520T1600Z/ Upper North Platte River Basin-South Laramie Range- Including the cities of Vedauwoo, Buford, Saratoga, Encampment, and Pumpkin Vine 1140 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 10 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures between 20 and 30 degrees expected. * WHERE...Upper North Platte River Basin and South Laramie Range. * WHEN...From 9 PM this evening to 10 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ101-115-201200- /O.UPG.KCYS.FZ.A.0002.260520T0600Z-260520T1400Z/ /O.NEW.KCYS.FZ.W.0003.260520T0600Z-260520T1400Z/ Converse County Lower Elevations-Laramie Valley- Including the cities of Douglas, Deer Creek, Laramie, Bill, Bosler, and Glenrock 1140 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures between 25 and 32 degrees expected. * WHERE...Converse County Lower Elevations and Laramie Valley. * WHEN...From midnight tonight to 8 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NEZ095-WYZ102-106-107-117-201200- /O.NEW.KCYS.FR.Y.0001.260520T0600Z-260520T1400Z/ Northern Sioux County-Niobrara County-Central Laramie Range and Southwest Platte County-East Platte County-South Laramie Range Foothills- Including the cities of Guernsey, Federal, Bordeaux, Redbird, Harrison, Whitaker, Wheatland, Horse Creek, and Lusk 1140 AM MDT Tue May 19 2026 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT WEDNESDAY... * WHAT...Temperatures as low as 28 will result in frost formation. * WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara County, Central Laramie Range and Southwest Platte County, East Platte County, and South Laramie Range Foothills. * WHEN...From midnight tonight to 8 AM MDT Wednesday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ MN Action: New Issued At: 2026-05-19 12:40:54 924 WWUS75 KCYS 191740 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 1140 AM MDT Tue May 19 2026 WYZ104-105-109>111-201200- /O.EXP.KCYS.FZ.W.0002.000000T0000Z-260519T1800Z/ /O.UPG.KCYS.FZ.A.0002.260520T0300Z-260520T1600Z/ /O.NEW.KCYS.FZ.W.0003.260520T0300Z-260520T1600Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County- Including the cities of Rawlins, Baggs, Medicine Bow, Seminoe Dam, Elk Mountain, Arlington, and Shirley Basin 1140 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 10 AM MDT WEDNESDAY... ...FREEZE WARNING WILL EXPIRE AT NOON MDT TODAY... * WHAT...Sub-freezing temperatures between 15 and 25 degrees expected. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, and Southwest Carbon County. * WHEN...From 9 PM this evening to 10 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ113-116-201200- /O.UPG.KCYS.FZ.A.0002.260520T0300Z-260520T1600Z/ /O.NEW.KCYS.FZ.W.0003.260520T0300Z-260520T1600Z/ Upper North Platte River Basin-South Laramie Range- Including the cities of Vedauwoo, Buford, Saratoga, Encampment, and Pumpkin Vine 1140 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 10 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures between 20 and 30 degrees expected. * WHERE...Upper North Platte River Basin and South Laramie Range. * WHEN...From 9 PM this evening to 10 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ101-115-201200- /O.UPG.KCYS.FZ.A.0002.260520T0600Z-260520T1400Z/ /O.NEW.KCYS.FZ.W.0003.260520T0600Z-260520T1400Z/ Converse County Lower Elevations-Laramie Valley- Including the cities of Douglas, Deer Creek, Laramie, Bill, Bosler, and Glenrock 1140 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures between 25 and 32 degrees expected. * WHERE...Converse County Lower Elevations and Laramie Valley. * WHEN...From midnight tonight to 8 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NEZ095-WYZ102-106-107-117-201200- /O.NEW.KCYS.FR.Y.0001.260520T0600Z-260520T1400Z/ Northern Sioux County-Niobrara County-Central Laramie Range and Southwest Platte County-East Platte County-South Laramie Range Foothills- Including the cities of Guernsey, Federal, Bordeaux, Redbird, Harrison, Whitaker, Wheatland, Horse Creek, and Lusk 1140 AM MDT Tue May 19 2026 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT WEDNESDAY... * WHAT...Temperatures as low as 28 will result in frost formation. * WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara County, Central Laramie Range and Southwest Platte County, East Platte County, and South Laramie Range Foothills. * WHEN...From midnight tonight to 8 AM MDT Wednesday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ MN Action: New Issued At: 2026-05-19 12:40:54 924 WWUS75 KCYS 191740 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 1140 AM MDT Tue May 19 2026 WYZ104-105-109>111-201200- /O.EXP.KCYS.FZ.W.0002.000000T0000Z-260519T1800Z/ /O.UPG.KCYS.FZ.A.0002.260520T0300Z-260520T1600Z/ /O.NEW.KCYS.FZ.W.0003.260520T0300Z-260520T1600Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County- Including the cities of Rawlins, Baggs, Medicine Bow, Seminoe Dam, Elk Mountain, Arlington, and Shirley Basin 1140 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 10 AM MDT WEDNESDAY... ...FREEZE WARNING WILL EXPIRE AT NOON MDT TODAY... * WHAT...Sub-freezing temperatures between 15 and 25 degrees expected. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, and Southwest Carbon County. * WHEN...From 9 PM this evening to 10 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ113-116-201200- /O.UPG.KCYS.FZ.A.0002.260520T0300Z-260520T1600Z/ /O.NEW.KCYS.FZ.W.0003.260520T0300Z-260520T1600Z/ Upper North Platte River Basin-South Laramie Range- Including the cities of Vedauwoo, Buford, Saratoga, Encampment, and Pumpkin Vine 1140 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 10 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures between 20 and 30 degrees expected. * WHERE...Upper North Platte River Basin and South Laramie Range. * WHEN...From 9 PM this evening to 10 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ101-115-201200- /O.UPG.KCYS.FZ.A.0002.260520T0600Z-260520T1400Z/ /O.NEW.KCYS.FZ.W.0003.260520T0600Z-260520T1400Z/ Converse County Lower Elevations-Laramie Valley- Including the cities of Douglas, Deer Creek, Laramie, Bill, Bosler, and Glenrock 1140 AM MDT Tue May 19 2026 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT WEDNESDAY... * WHAT...Sub-freezing temperatures between 25 and 32 degrees expected. * WHERE...Converse County Lower Elevations and Laramie Valley. * WHEN...From midnight tonight to 8 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NEZ095-WYZ102-106-107-117-201200- /O.NEW.KCYS.FR.Y.0001.260520T0600Z-260520T1400Z/ Northern Sioux County-Niobrara County-Central Laramie Range and Southwest Platte County-East Platte County-South Laramie Range Foothills- Including the cities of Guernsey, Federal, Bordeaux, Redbird, Harrison, Whitaker, Wheatland, Horse Creek, and Lusk 1140 AM MDT Tue May 19 2026 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT WEDNESDAY... * WHAT...Temperatures as low as 28 will result in frost formation. * WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara County, Central Laramie Range and Southwest Platte County, East Platte County, and South Laramie Range Foothills. * WHEN...From midnight tonight to 8 AM MDT Wednesday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ MN Action: Continued Issued At: 2026-05-20 01:56:51 836 WWUS75 KCYS 200656 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 1256 AM MDT Wed May 20 2026 WYZ101-115-201400- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1400Z/ Converse County Lower Elevations-Laramie Valley- Including the cities of Deer Creek, Glenrock, Bill, Douglas, Laramie, and Bosler 1256 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures between 25 and 32 degrees expected. * WHERE...Converse County Lower Elevations and Laramie Valley. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ104-105-109>111-113-116-201600- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County-Upper North Platte River Basin-South Laramie Range- Including the cities of Buford, Encampment, Vedauwoo, Seminoe Dam, Rawlins, Shirley Basin, Arlington, Saratoga, Medicine Bow, Baggs, Pumpkin Vine, and Elk Mountain 1256 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 16 degrees. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, Southwest Carbon County, Upper North Platte River Basin, and South Laramie Range. * WHEN...Until 10 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NEZ095-WYZ102-106-107-117-201400- /O.CON.KCYS.FR.Y.0001.000000T0000Z-260520T1400Z/ Northern Sioux County-Niobrara County-Central Laramie Range and Southwest Platte County-East Platte County-South Laramie Range Foothills- Including the cities of Harrison, Horse Creek, Wheatland, Bordeaux, Guernsey, Whitaker, Federal, Redbird, and Lusk 1256 AM MDT Wed May 20 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Temperatures between 29 and 34 will result in frost formation. * WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara County, Central Laramie Range and Southwest Platte County, East Platte County, and South Laramie Range Foothills. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Trudel Action: Continued Issued At: 2026-05-20 01:56:51 836 WWUS75 KCYS 200656 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 1256 AM MDT Wed May 20 2026 WYZ101-115-201400- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1400Z/ Converse County Lower Elevations-Laramie Valley- Including the cities of Deer Creek, Glenrock, Bill, Douglas, Laramie, and Bosler 1256 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures between 25 and 32 degrees expected. * WHERE...Converse County Lower Elevations and Laramie Valley. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ104-105-109>111-113-116-201600- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County-Upper North Platte River Basin-South Laramie Range- Including the cities of Buford, Encampment, Vedauwoo, Seminoe Dam, Rawlins, Shirley Basin, Arlington, Saratoga, Medicine Bow, Baggs, Pumpkin Vine, and Elk Mountain 1256 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 16 degrees. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, Southwest Carbon County, Upper North Platte River Basin, and South Laramie Range. * WHEN...Until 10 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NEZ095-WYZ102-106-107-117-201400- /O.CON.KCYS.FR.Y.0001.000000T0000Z-260520T1400Z/ Northern Sioux County-Niobrara County-Central Laramie Range and Southwest Platte County-East Platte County-South Laramie Range Foothills- Including the cities of Harrison, Horse Creek, Wheatland, Bordeaux, Guernsey, Whitaker, Federal, Redbird, and Lusk 1256 AM MDT Wed May 20 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Temperatures between 29 and 34 will result in frost formation. * WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara County, Central Laramie Range and Southwest Platte County, East Platte County, and South Laramie Range Foothills. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Trudel Action: Continued Issued At: 2026-05-20 02:51:08 425 WWUS75 KCYS 200750 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 150 AM MDT Wed May 20 2026 WYZ116-201600- /O.NEW.KCYS.FG.Y.0004.260520T0750Z-260520T1500Z/ /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 150 AM MDT Wed May 20 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING... ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...For the Dense Fog Advisory, visibility below one quarter of a mile in dense fog. For the Freeze Warning, sub-freezing temperatures as low as 30 degrees. * WHERE...South Laramie Range. * WHEN...For the Dense Fog Advisory, until 9 AM MDT this morning. For the Freeze Warning, until 10 AM MDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ WYZ101-115-201400- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1400Z/ Converse County Lower Elevations-Laramie Valley- Including the cities of Deer Creek, Glenrock, Bill, Douglas, Laramie, and Bosler 150 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures between 25 and 32 degrees expected. * WHERE...Converse County Lower Elevations and Laramie Valley. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ104-105-109>111-113-201600- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County-Upper North Platte River Basin- Including the cities of Encampment, Seminoe Dam, Rawlins, Shirley Basin, Arlington, Saratoga, Medicine Bow, Baggs, and Elk Mountain 150 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 13. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, Southwest Carbon County, Upper North Platte River Basin, and South Laramie Range. * WHEN...Until 10 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NEZ095-WYZ102-106-107-117-201400- /O.CON.KCYS.FR.Y.0001.000000T0000Z-260520T1400Z/ Northern Sioux County-Niobrara County-Central Laramie Range and Southwest Platte County-East Platte County-South Laramie Range Foothills- Including the cities of Harrison, Horse Creek, Wheatland, Bordeaux, Guernsey, Whitaker, Federal, Redbird, and Lusk 150 AM MDT Wed May 20 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Temperatures between 29 and 34 will result in frost formation. * WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara County, Central Laramie Range and Southwest Platte County, East Platte County, and South Laramie Range Foothills. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Trudel Action: Continued Issued At: 2026-05-20 02:51:08 425 WWUS75 KCYS 200750 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 150 AM MDT Wed May 20 2026 WYZ116-201600- /O.NEW.KCYS.FG.Y.0004.260520T0750Z-260520T1500Z/ /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 150 AM MDT Wed May 20 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING... ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...For the Dense Fog Advisory, visibility below one quarter of a mile in dense fog. For the Freeze Warning, sub-freezing temperatures as low as 30 degrees. * WHERE...South Laramie Range. * WHEN...For the Dense Fog Advisory, until 9 AM MDT this morning. For the Freeze Warning, until 10 AM MDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ WYZ101-115-201400- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1400Z/ Converse County Lower Elevations-Laramie Valley- Including the cities of Deer Creek, Glenrock, Bill, Douglas, Laramie, and Bosler 150 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures between 25 and 32 degrees expected. * WHERE...Converse County Lower Elevations and Laramie Valley. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ104-105-109>111-113-201600- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County-Upper North Platte River Basin- Including the cities of Encampment, Seminoe Dam, Rawlins, Shirley Basin, Arlington, Saratoga, Medicine Bow, Baggs, and Elk Mountain 150 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 13. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, Southwest Carbon County, Upper North Platte River Basin, and South Laramie Range. * WHEN...Until 10 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NEZ095-WYZ102-106-107-117-201400- /O.CON.KCYS.FR.Y.0001.000000T0000Z-260520T1400Z/ Northern Sioux County-Niobrara County-Central Laramie Range and Southwest Platte County-East Platte County-South Laramie Range Foothills- Including the cities of Harrison, Horse Creek, Wheatland, Bordeaux, Guernsey, Whitaker, Federal, Redbird, and Lusk 150 AM MDT Wed May 20 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Temperatures between 29 and 34 will result in frost formation. * WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara County, Central Laramie Range and Southwest Platte County, East Platte County, and South Laramie Range Foothills. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Trudel Action: Continued Issued At: 2026-05-20 02:51:08 425 WWUS75 KCYS 200750 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 150 AM MDT Wed May 20 2026 WYZ116-201600- /O.NEW.KCYS.FG.Y.0004.260520T0750Z-260520T1500Z/ /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 150 AM MDT Wed May 20 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING... ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...For the Dense Fog Advisory, visibility below one quarter of a mile in dense fog. For the Freeze Warning, sub-freezing temperatures as low as 30 degrees. * WHERE...South Laramie Range. * WHEN...For the Dense Fog Advisory, until 9 AM MDT this morning. For the Freeze Warning, until 10 AM MDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ WYZ101-115-201400- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1400Z/ Converse County Lower Elevations-Laramie Valley- Including the cities of Deer Creek, Glenrock, Bill, Douglas, Laramie, and Bosler 150 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures between 25 and 32 degrees expected. * WHERE...Converse County Lower Elevations and Laramie Valley. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ104-105-109>111-113-201600- /O.CON.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County-Upper North Platte River Basin- Including the cities of Encampment, Seminoe Dam, Rawlins, Shirley Basin, Arlington, Saratoga, Medicine Bow, Baggs, and Elk Mountain 150 AM MDT Wed May 20 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 13. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, Southwest Carbon County, Upper North Platte River Basin, and South Laramie Range. * WHEN...Until 10 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NEZ095-WYZ102-106-107-117-201400- /O.CON.KCYS.FR.Y.0001.000000T0000Z-260520T1400Z/ Northern Sioux County-Niobrara County-Central Laramie Range and Southwest Platte County-East Platte County-South Laramie Range Foothills- Including the cities of Harrison, Horse Creek, Wheatland, Bordeaux, Guernsey, Whitaker, Federal, Redbird, and Lusk 150 AM MDT Wed May 20 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Temperatures between 29 and 34 will result in frost formation. * WHERE...In Nebraska, Northern Sioux County. In Wyoming, Niobrara County, Central Laramie Range and Southwest Platte County, East Platte County, and South Laramie Range Foothills. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Trudel Action: Expired Issued At: 2026-05-20 11:11:51 150 WWUS75 KCYS 201611 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 1011 AM MDT Wed May 20 2026 WYZ104-105-109>111-113-116-201715- /O.EXP.KCYS.FZ.W.0003.000000T0000Z-260520T1600Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County-Upper North Platte River Basin-South Laramie Range- Including the cities of Medicine Bow, Pumpkin Vine, Seminoe Dam, Elk Mountain, Vedauwoo, Arlington, Saratoga, Shirley Basin, Baggs, Buford, Rawlins, and Encampment 1011 AM MDT Wed May 20 2026 ...FREEZE WARNING HAS EXPIRED... Temperatures have warmed above freezing across the area. $$ MN | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||