Forecasters knew days ahead that 2 clashing air masses would create major storm
An aerial view of Plaza Towers Elementary School, devastated in the Moore, Okla., tornado.
Posted: Tuesday, May 21, 2013 12:00 am
When National Weather Service forecasters saw late last week the mix of atmospheric conditions that models were predicting would come together Monday, they knew it would be significant.
They saw a clash of two strong, conflicting air masses, the perfect mixture of winds at the surface and in the upper atmosphere and enough instability to quickly create devastating, long-track tornadoes — it was like a bull's-eye over central Oklahoma.
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Tuesday, May 21, 2013 12:00 am.