April 20, 2011 6:40 am EarthWatch AM Forecast April 20 We’re in for a warm one with a high of 81, but there’s also a chance of scattered showers and a thunderstorm by late afternoon. US & World Videos 2:50 One more cool day, then warmer weather ahead 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