431 WWUS73 KLBF 200720 NPWLBF URGENT - WEATHER MESSAGE National Weather Service North Platte NE 220 AM CDT Wed May 20 2026 NEZ006-007-009-010-028-029-201145- /O.CON.KLBF.FR.Y.0002.000000T0000Z-260520T1200Z/ Keya Paha-Boyd-Rock-Holt-Garfield-Wheeler- Including the cities of Lynch, Spencer, Springview, Butte, Bassett, Ericson, Bartlett, Burwell, Rose, Atkinson, and O'Neill 220 AM CDT Wed May 20 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 7 AM CDT THIS MORNING... * WHAT...Temperatures as low as the middle 30s will result in frost formation. * WHERE...A portion of north central Nebraska. * WHEN...Until 7 AM CDT 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. && $$ For more information from the National Weather Service, visit www.weather.gov/lbf. NMJ  700 WWUS71 KPHI 200727 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 327 AM EDT Wed May 20 2026 DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-202030- /O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/ New Castle-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Kennett Square, Lansdale, Philadelphia, Trenton, Morrisville, Doylestown, Glassboro, Moorestown, Mount Holly, Media, West Chester, Wilmington, Cherry Hill, Norristown, and Camden 327 AM EDT Wed May 20 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 97 degrees expected. * WHERE...In Delaware, New Castle County. In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Maximum heat indices near 100 degrees during peak heating this afternoon. Given the intensity of this early season stretch of heat and humidity, we are not fully acclimated to it and therefore impacts could be greater if precautions are not taken. Showers and some thunderstorms arrive later this afternoon and evening which will end this early season heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ NJZ007>010-PAZ060>062-101-103-105-202030- /O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/ Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-Western Chester-Western Montgomery-Upper Bucks- Including the cities of Morristown, Collegeville, Washington, Reading, Allentown, Flemington, Somerville, Honey Brook, Bethlehem, Perkasie, Easton, Pottstown, Chalfont, and Oxford 327 AM EDT Wed May 20 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 93 degrees expected. * WHERE...In New Jersey, Morris, Somerset, Warren, and Hunterdon Counties. In Pennsylvania, Berks, Lehigh, Northampton, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Maximum heat indices near 95 degrees during peak heating this afternoon. Given the intensity of this early season stretch of heat and humidity, we are not fully acclimated to it and therefore impacts could be greater if precautions are not taken. Showers and some thunderstorms arrive this afternoon and evening which will end this early season heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ NJZ012-013-020-027-202030- /O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/ Middlesex-Western Monmouth-Ocean-Southeastern Burlington- Including the cities of Jackson, Freehold, New Brunswick, and Wharton State Forest 327 AM EDT Wed May 20 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 98 degrees expected. * WHERE...Western Monmouth, Middlesex, Ocean, and Southeastern Burlington Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Maximum heat indices near 100 degrees during peak heating this afternoon. Given the intensity of this early season stretch of heat and humidity, we are not fully acclimated to it and therefore impacts could be greater if precautions are not taken. Showers and some thunderstorms arrive later this afternoon and evening which will end this early season heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ AKL  016 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