March 25, 2011 12:16 am EarthWatch Evening Forecast: Thursday, March 24 Cold is here to stay for a while. US & World Videos 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 3:05 Temperatures to heat up over the weekend 2:05 Warming into the 80s by weekend's end