tornadoes

Researchers at Purdue are using software to mine tweets for data that can help warn that a dangerous storm is approaching. But the data may not always be reliable and analyzing it can be tricky.

A scientist who studies tornadoes says there's still much to be learned about how they form and how to better forecast them. Still, the storm chasing and research communities will be reevaluating their procedures in the wake of three colleagues' deaths.

There were hugs and tears, smiles and laughter on Thursday, as students and teachers from Plaza Towers Elementary School, destroyed in Monday's tornado in Moore, Okla., reunited. The school district reopened all of its schools just for the day on what would have been the final day of classes before summer vacation.