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How are these active tornadoes affecting cities and interstates? Find out with Weather Underground's infographic.⎜For more infographics, visit

The question everyone from toddlers to Ph.D. candidates have asked: Why the sky is blue?⎜Infographic by Weather Underground⎜For more infographics, visit

A rescue boat passes in front of a beautiful rainbow on Lake Ontario in Burlington, Ontario, Canada • photo: Gary (Melagoo) on

Craggy Gardens on Blue Ridge Parkway near Asheville, North Carolina • photo: July04Girl on WunderPhotos

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Marquette, MI

The aurora was active last night....dynamic I should say. In 5 minutes it went from low on the horizon to overhead, with small areas lightening and darkening and waves of light flashing through the display. Truly spectacular. I wish all my WU friends could have been here to experience it! Photo by den117. For more photos, visit