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.
Top Ten Largest Shopping Malls in the U.S. Just in time for the holiday shopping season, a look at Americaâs largest malls (based on retail space): 10. Palisades Center, West Nyack, NY (2,217,322 sq ft) 9. Woodfield Mall, Schaumburg, IL (2,224,000 sq ft) 8. Roosevelt Field, Garden City, NY (2,244,581 sq ft)