Powerful thunderstorms will fire up from Denver to Chicago through this evening. The main threats will be large hail, damaging winds and torrential downpours, but an isolated tornado cannot be ruled out. Follow the latest radar activity for the highlighted cities below or zoom into your hometown on the Interactive Radar.
Temperatures will remain on a roller coaster ride in Boston the next several days.
Harrisburg will experience a taste of spring before colder air and a possible storm arrives at midweek.
The main weather concern to search crews through Monday in the vicinity of where the Malaysia Airlines Boeing 777 lost contact will be building seas.
"We exchanged notes already pledging to work together for the common good of the weather enterprise and the nation," AccuWeather CEO Barry Myers said.
The long-lasting and relentless winter season has broken seasonal maintenance expenditure records across much of the U.S.
This March has been and will continue to be a month on the wild side with storms and temperature extremes.
Philadelphia, PA (1941)
8.0" of snow.
Dallas-Monroe Co. AR (1909)
Tornadoes killed 64 and injured 671.
Thule Air Base, Greenland (1972)
A wind gust of 207 mph recorded.