Weather Alerts For Lyndon, IL

# HEADLINE -------------------- EXTREME HEAT WARNING IN EFFECT FROM NOON MONDAY TO 9 PM CDT TUESDAY # DETAILS -------------------- WHAT Dangerously hot conditions with heat index values exceeding 100 degrees multiple days. WHERE Portions of north central and northwest Illinois and east central and northeast Iowa. WHEN From noon Monday to 9 PM CDT Tuesday. IMPACTS Heat related illnesses increase significantly during extreme heat and high humidity events. ADDITIONAL DETAILS There is the possibility that excessive heat will last for much of next week. Thunderstorms and associated cloud debris may interrupt the excessive heat at times late in the week. ISSUED AT Sunday, June 28, 2026 at 1:21 AM CDT ISSUED BY National Weather Service Quad Cities IA IL HEADER URGENT - WEATHER MESSAGE # 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. # AREAS AFFECTED -------------------- Stephenson, Buchanan, Bureau, Carroll, Clinton, Delaware, Dubuque, Henry IL, Jackson, Jo Daviess, Jones, Putnam, Whiteside Including the cities of Maquoketa, Sterling, Independence, Hennepin, Freeport, Anamosa, Geneseo, Princeton, Clinton, Galena, Manchester, Mount Carroll, and Dubuque