June 21, 2010 6:16 pm Today's EarthWatch Forecast: Monday, June 21 – Evening Today’s EarthWatch Forecast: Monday, June 21 – Evening 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'