* WHAT. Peak afternoon heat indices between 95 to around 100 degrees. * WHERE. Portions of north central, northwest, and west central Illinois, east central, northeast, and southeast Iowa, and northeast Missouri. * WHEN. From 10 AM this morning to 8 PM CDT Tuesday. * IMPACTS. Hot temperatures and humid conditions may cause heat illnesses. * ADDITIONAL DETAILS. Overnight temperatures in the 70s will provide little relief for those without air conditioning.

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 427 IN EFFECT UNTIL 10 AM CDT THIS MORNING FOR THE FOLLOWING AREAS IN IOWA THIS WATCH INCLUDES 6 COUNTIES IN NORTH CENTRAL IOWA FLOYD MITCHELL IN NORTHEAST IOWA ALLAMAKEE CHICKASAW HOWARD WINNESHIEK IN MINNESOTA THIS WATCH INCLUDES 7 COUNTIES IN SOUTHEAST MINNESOTA DODGE FILLMORE HOUSTON MOWER OLMSTED WABASHA WINONA IN WISCONSIN THIS WATCH INCLUDES 7 COUNTIES IN CENTRAL WISCONSIN CLARK IN SOUTHWEST WISCONSIN VERNON IN WEST CENTRAL WISCONSIN BUFFALO JACKSON LA CROSSE MONROE TREMPEALEAU THIS INCLUDES THE CITIES OF ALMA, ARCADIA, AUSTIN, BLACK RIVER FALLS, CALEDONIA, CHARLES CITY, CRESCO, DECORAH, DODGE CENTER, LA CROSSE, NEILLSVILLE, NEW HAMPTON, OSAGE, PRESTON, ROCHESTER, SPARTA, TOMAH, VIROQUA, WABASHA, WAUKON, WHITEHALL, AND WINONA.