People cool off Wednesday in a pool in Shanghai, where temperatures reached an all-time record: 105.4 degrees. Frank Langfitt/NPR hide caption

toggle caption Frank Langfitt/NPR

Excessive heat warnings will continue for much of the Desert Southwest through Monday. Here, Maria Wieser of Italy drinks water while sightseeing in Death Valley National Park on Friday. Chris Carlson/AP hide caption

toggle caption Chris Carlson/AP

Quite a show in Chicago: Lightning struck the Willis Tower (formerly the Sears Tower, at right) on Wednesday as the storm system moved through. Scott Olson/Getty Images hide caption

toggle caption Scott Olson/Getty Images

A map shows the chance of severe thunderstorms Wednesday evening, with the National Weather Service predicting strong winds and storms moving eastward to the mid-Atlantic Thursday. NOAA hide caption

toggle caption NOAA

The funnel of this tornadic thunderstorm came close to the ground near South Haven, Kansas, on Sunday. Gene Blevins /Reuters /Landov hide caption

toggle caption Gene Blevins /Reuters /Landov

Where is spring? Icy branches partially blocked a city street Wednesday in Sioux Falls, S.D. More wintry weather is expected there Thursday. Dirk Lammers /ASSOCIATED PRESS hide caption

toggle caption Dirk Lammers /ASSOCIATED PRESS

NPR thanks our sponsors

Become an NPR sponsor