Increasing rain chances this afternoon

AUSTIN (KXAN) -- Saturday dawned sunny. High thin cirrus clouds along with a few cumulus clouds increased during the late-morning hours. Low temperatures dropped to the low to mid 70s. Camp Mabry's low was 76°.This afternoon's forecast features highs in triple digits at many locations along with a 40% chance of showers and thunderstorms.A hot start to this weekendThe heat index today will get as high as 104° to 108°. A Heat Advisory is posted from 1 to 7 p.m. for Hays, Travis, and Wi