UPDATE: That was awesome! Temp dropped from 94 to 80 in our back yard (digital thermometer under our lawn chairs.) Birds seemed confused. Cicadas got loud. A couple of photos from the back yard (click image for bigger):

Heavy traffic on Alcoa Hwy/US129.

Lots of people showing up at Springbrook Park in Alcoa.

Reports of lots of people showing up at Cove Lake, other parks.

Smoky Mountains NP roads congested, large crowds at Clingman's Dome.

Reports of backups on area interstates.

Downtown Sweetwater filling up.

TVA reports all areas at Fontana Dam full, cars being turned away.