A massive winter storm system is rolling across the Plains and Midwest U.S., headed for the New England Region. Snow amounts of up to three feet have been dumped in some parts of Illinois and Indiana, and more is on its way. Whereas the Midwest is plagued with snow, ice will be the danger in Pennsylvania. Temperatures are warming from Maryland south, which will bring only rain to the Mid-Atlantic and Southeast.

This animation shows GOES-East satellite infrared water vapor imagery from January 29 -February 1, 2011. The GOES satellites provide visible and infrared imagery of the U.S. every 15 minutes. The blue colored areas show the most intense, moist areas of the atmosphere that are responsible for these major precipitation events. Also included, at the end, is the snow precipitation amounts from Jan 31 - Feb 1, 2011.