June 18, 2013
On your birthday, the Earth completed another orbit — 584 million miles traveled since your last celebration.
A Supercell Thunderstorm Over Texas
Birthday · June 18, 2013
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APOD published June 18, 2013 · Video still. Credit: Mike Olbinski; Music: Impact Lento (Kevin MacLeod, Incompetech). A publication-date match, not a photo taken on your date. Independent of NASA.
Is that a cloud or an alien spaceship? It's an unusual and sometimes dangerous type of thunderstorm cloud called a supercell. Supercells may spawn damaging tornados, hail, downbursts of air, or drenching rain. Or they may just look impressive. A supercell harbors a mesocyclone -- a rising column of air surrounded by drafts of falling air. Supercells could occur over many places on Earth but are particularly common in Tornado Alley of the USA. Pictured above are four time lapse sequences of a supercell rotating above and moving across Booker, Texas. Captured in the video are new clouds forming near the storm center, dust swirling on the ground, lightning flashing in the upper clouds, all while the impressively sculptured complex rotates ominously. Finally, after a few hours, as shown in the final sequence, dense rain falls as the storm begins to die out. Follow APOD on: Facebook (Daily) (Sky) (Spanish) or Google Plus (Daily) (River)
Image credit: Mike Olbinski; Music: Impact Lento (Kevin MacLeod, Incompetech)