WWUS75 KCYS 181900 NPWCYS URGENT - WEATHER MESSAGE National Weather Service Cheyenne WY 100 PM MDT Mon May 18 2026 WYZ104-105-109>111-191200- /O.UPG.KCYS.FZ.A.0001.260519T0300Z-260519T1600Z/ /O.NEW.KCYS.FZ.A.0002.260520T0300Z-260520T1600Z/ /O.EXB.KCYS.FZ.W.0002.260519T0000Z-260519T1800Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin-Central Carbon County-North Snowy Range Foothills-Southwest Carbon County- Including the cities of Medicine Bow, Rawlins, Elk Mountain, Arlington, Shirley Basin, Seminoe Dam, and Baggs 100 PM MDT Mon May 18 2026 ...FREEZE WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON MDT TUESDAY... ...FREEZE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY MORNING... * WHAT...For the Freeze Warning tonight, sub-freezing temperatures as low as 12 above expected. For the Freeze Watch Tuesday night, sub-freezing temperatures as low as 18 possible. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, North Snowy Range Foothills, Shirley Basin, and Southwest Carbon County. * WHEN...For the Freeze Warning, from 6 PM this evening to noon MDT Tuesday. For the Freeze Watch, from Tuesday evening through Wednesday 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. && $$ WYZ113-191200- /O.UPG.KCYS.FZ.A.0001.260519T0600Z-260519T1600Z/ /O.NEW.KCYS.FZ.A.0002.260520T0300Z-260520T1600Z/ /O.EXB.KCYS.FZ.W.0002.260519T0600Z-260519T1600Z/ Upper North Platte River Basin- Including the cities of Encampment and Saratoga 100 PM MDT Mon May 18 2026 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM MDT TUESDAY... ...FREEZE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY MORNING... * WHAT...For the Freeze Warning tonight, sub-freezing temperatures as low as 18 expected. For the Freeze Watch Tuesday night, sub-freezing temperatures as low as 20 possible. * WHERE...Upper North Platte River Basin. * WHEN...For the Freeze Warning, from midnight tonight to 10 AM MDT Tuesday. For the Freeze Watch, from Tuesday evening through Wednesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ NEZ002-003-020-021-054-055-191200- /O.UPG.KCYS.FZ.A.0001.260519T0600Z-260519T1600Z/ /O.EXB.KCYS.FZ.W.0002.260519T0600Z-260519T1600Z/ Dawes County-Box Butte County-Banner County-Morrill County- Kimball County-Cheyenne County- Including the cities of Harrisburg, Kimball, Chadron St Park, Bridgeport, Hemingford, Alliance, Redington, Angora, Chadron, Bayard, Sidney, and Brownson 100 PM MDT Mon May 18 2026 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 25 expected. * WHERE...Banner County, Box Butte County, Cheyenne County, Dawes County, Kimball County, and Morrill County. * WHEN...From midnight tonight to 10 AM MDT Tuesday. * 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. && $$ WYZ115-191200- /O.UPG.KCYS.FZ.A.0001.260519T0600Z-260519T1600Z/ /O.NEW.KCYS.FZ.A.0002.260520T0600Z-260520T1400Z/ /O.EXA.KCYS.FZ.W.0002.260519T0200Z-260519T1600Z/ Laramie Valley- Including the cities of Laramie and Bosler 100 PM MDT Mon May 18 2026 ...FREEZE WARNING IN EFFECT FROM 8 PM THIS EVENING TO 10 AM MDT TUESDAY... ...FREEZE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY MORNING... * WHAT...For the Freeze Warning tonight, sub-freezing temperatures as low as 17 expected. For the Freeze Watch Tuesday night, sub-freezing temperatures as low as 26 possible. * WHERE...Laramie Valley. * WHEN...For the Freeze Warning, from 8 PM this evening to 10 AM MDT Tuesday. For the Freeze Watch, from late Tuesday night through Wednesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ116-191200- /O.UPG.KCYS.FZ.A.0001.260519T0600Z-260519T1600Z/ /O.NEW.KCYS.FZ.A.0002.260520T0300Z-260520T1600Z/ /O.EXA.KCYS.FZ.W.0002.260519T0200Z-260519T1600Z/ South Laramie Range- Including the cities of Vedauwoo, Pumpkin Vine, and Buford 100 PM MDT Mon May 18 2026 ...FREEZE WARNING IN EFFECT FROM 8 PM THIS EVENING TO 10 AM MDT TUESDAY... ...FREEZE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY MORNING... * WHAT...For the Freeze Warning tonight, sub-freezing temperatures as low as 12 above expected. For the Freeze Watch Tuesday night, sub-freezing temperatures as low as 23 possible. * WHERE...South Laramie Range. * WHEN...For the Freeze Warning, from 8 PM this evening to 10 AM MDT Tuesday. For the Freeze Watch, from Tuesday evening through Wednesday 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. && $$ WYZ106-117>119-191200- /O.UPG.KCYS.FZ.A.0001.260519T0600Z-260519T1600Z/ /O.EXA.KCYS.FZ.W.0002.260519T0200Z-260519T1600Z/ Central Laramie Range and Southwest Platte County-South Laramie Range Foothills-Central Laramie County-East Laramie County- Including the cities of Whitaker, Bordeaux, Cheyenne, Pine Bluffs, Federal, and Horse Creek 100 PM MDT Mon May 18 2026 ...FREEZE WARNING IN EFFECT FROM 8 PM THIS EVENING TO 10 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 20 expected. * WHERE...Central Laramie County, Central Laramie Range and Southwest Platte County, East Laramie County, and South Laramie Range Foothills. * WHEN...From 8 PM this evening to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ WYZ101-191200- /O.NEW.KCYS.FZ.A.0002.260520T0600Z-260520T1400Z/ /O.CON.KCYS.FZ.W.0002.260519T0200Z-260519T1600Z/ Converse County Lower Elevations- Including the cities of Deer Creek, Douglas, Bill, and Glenrock 100 PM MDT Mon May 18 2026 ...FREEZE WARNING REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 10 AM MDT TUESDAY... ...FREEZE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY MORNING... * WHAT...For the Freeze Warning tonight, sub-freezing temperatures as low as 16 expected. For the Freeze Watch Tuesday night, sub-freezing temperatures as low as 23 possible. * WHERE...Converse County Lower Elevations. * WHEN...For the Freeze Warning, from 8 PM this evening to 10 AM MDT Tuesday. For the Freeze Watch, from late Tuesday night through Wednesday 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. && $$ NEZ019-095-096-WYZ102-107-108-191200- /O.CON.KCYS.FZ.W.0002.260519T0200Z-260519T1600Z/ Scotts Bluff County-Northern Sioux County-Southern Sioux County- Niobrara County-East Platte County-Goshen County- Including the cities of Gering, Wheatland, Scottsbluff, Torrington, Harrison, Agate, Lusk, Guernsey, and Redbird 100 PM MDT Mon May 18 2026 ...FREEZE WARNING REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 10 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 21 expected. * WHERE...In Nebraska, Northern Sioux County, Scotts Bluff County, and Southern Sioux County. In Wyoming, Niobrara County, East Platte County, and Goshen County. * WHEN...From 8 PM this evening to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CG