First Alert Weather September 23, 2021 6:03 am First Alert for Flash Flooding, Severe Storm Threat NBC10 First Alert Weather meteorologist Bill Henley is tracking severe storms and flash flooding threats for Thursday. Get the latest on the timing. US & World Videos 2:43 Philly is warmer than Miami, Florida, Monday 2:06 Feeling like summer 2:36 A summer preview 2:50 One more cool day, then warmer weather ahead 3:15 Cold night, then a big warmup this weekend