Lotsa data, at your fingertip. This is a mouthful of a title as well :
CWSU National TAF METAR Map Displays
(of current weather observations and forecasts)
( http://www.wrh.noaa.gov/zoa/mwmap3.php?map=usa )
As you mouse over each city/airport spot, a pop-up window give the current conditions. You can select specific regions or select cities, temperature plots in degrees F or C . . . Some serious screen candy for us weather freaks.