Moderate Expected Likely Heat Advisory Heat Advisory issued September 17 at 12:01PM CDT until September 19 at 8:00PM CDT by NWS Huntsville AL Sep 17, 12:01 PM → Sep 19, 8:00 PM WHAT: Heat index values of up to 100 to 105. WHERE: All of north Alabama and southern middle Tennessee. WHEN: Until 8 PM CDT Saturday. IMPACTS: Hot temperatures and high humidity may cause heatillnesses. + Read More Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. Updated: Sep 18, 7:14 AM Source: NWS Alert