Heat Advisory issued August 18 at 1:40PM MDT until August 19 at 8:00PM MDT by NWS

…HEAT ADVISORY IN EFFECT FROM 1 PM TO 9 PM CDT SATURDAY… * WHAT…Heat index values up to 109 expected. * WHERE…Portions of northwest and west central Iowa, southwest Minnesota, northeast Nebraska and east central, south central and southeast South Dakota. * WHEN…From 1 PM to 9 PM CDT Saturday.