 The ocean surges onto the streets of South Nags Head, N.C., wiping out dunes and damaging houses during the Halloween "perfect storm" of 1991. Ocean waters wash over barrier islands during storms because winds push water against the shore, low atmospheric pressure allows the water level to bulge upward, and breaking waves force water toward the shore. (Photo by Herman C. Miller, U.S. Army Corps of Engineers)[back]
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