August 20, 2010 5:30 pm Today's EarthWatch Forecast: Friday, August 20th Today’s EarthWatch Forecast: Friday, August 20th 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