Philadelphia June 11, 2018 6:57 am NBC10 First Alert Weather: Effects of Flash Flooding NBC10 First Alert Weather meteorologist Brittney Shipp details what can lead to flash flooding and how it can quickly cause trouble. US & World Videos 3:15 Cold night, then a big warmup this weekend 3:05 Temperatures to heat up over the weekend 2:05 Warming into the 80s by weekend's end 2:09 Big weekend warm-up expected 2:49 NBC10 First Alert Weather: ‘Feeling like 2 different weekends'