Colliding air masses within tornado alley make for exceptional conditions that allow for vigorously rising air, which is essential for thunderstorms. Storms in the Great Plains regularly reach 10 miles (16 kilometers) into the sky because of these conditions: 1  Winds pushing disparate air masses converge in tornado alley. 2  Colliding air, known as fronts, have nowhere to go, therefore they rise.
Apple's fiscal 2011 10-K report showed that the average size of an Apple Store has creeped up to 8,400 square feet per store, but Needham & Company analyst Charlie Wolf says that the retail stores are bulging at the seams and just aren't big enough.
Among shopping mall retailers the food court area, considered as a single store, and jewelers post the highest sales per unit area, in the range of $600 per square foot ($6,000/mÂ²).Books and sporting goods are among the lowest.ne square foot is 0.09290304 square meters. So a sales per unit area of $400 per square foot is (400/0.09290304) = $4305.56 sales per square meter. One acre = 43,560 square feet.