Tornado alley. Click on the image to view the large version. The middle part of the United States is an area that has many tornadoes, particularly in the spring. This area is known as tornado alley. The reason is because it is an area where large cold air masses and large warm air masses collide. When these air masses crash into each other, it can cause thunderstorms and they can create tornadoes.
Strip malls are usually comprised of a series of retail stores whose average size approximates about 1,000 square feet each. As such, most strip malls total less than 20,000 square feet in size. They typically have good visibility due to being generally located on the perimeters of densely populated neighborhoods, heavily trafficked commercial streets that have easy access, or on or near corners.
Average per store selling area of supermarkets in the U.S. 2012-2014. Average per store selling area of supermarkets in the United States from 2012 to 2014 (in square feet). 1  Average weekly sales per square feet of supermarket stores in the U.S. 2012-2014 +.his statistic represents the leading U.S. retail stores by segment in 2012, based on the highest sales per square foot. With sales of 3,017 U.S. dollars per square foot, Tiffany & Co. topped the list in the luxury and accessories segment.