The Southern Coastlands includes parts of Texas and Louisiana, 2 of the 3 leading petroleum-producing states (the third being Alaska). Although 60% of Arizona's gasoline comes from its West Line- a 20 inch diameter pipeline that runs from Los Angeles through Southern California, Yuma, and ends in Phoenix- the rest comes from its East Line and Longhorn Pipeline that come from Gulf Coast refineries of the Southern Coastlands. (http://www.azgovernor.gov/estf/distribution.pdf)
Arizona's East Line consists of two pipelines, one 8 inch and one 12 inch in diamater pipelines, running parallel to each other from El Paso, Texas to Tuscon, Arizona. From Tuscon, the the two separate pipelines become one pipeline and stretch from El Paso to Phoenix. The Newer Longhorn Pipeline runs from Houston to El Paso before connecting to the Eastl Line. (http://www.azgovernor.gov/estf/distribution.pdf)
Arizona is separated form the Southern Coastlands by New Mexico and most of Texas. Unlike the Pacific Coastal regions of the United States, the Southern Coastlands are highly vulnerable to powerful hurricanes generated by the solar heating over the Gulf of Mexico.
Though less frequent, Arizona too can experience tropical storms just like the Southern Coastlands. Unlike the Southern Coastal storms that originate in the Gulf of Mexico, tropical storms that have been known to affect Arizona originate in the Eastern Pacific Ocean. Although most of these storms are carried away from or parallel to the Pacific Coast, Arizona still experiences the effects of tropical cyclones one every five years on average. (Corbosiero, Kristen L. (2003). "The Contribution of Eastern North Pacific Tropical Cyclones to the Warm Season Rainfall Climatology of the Southwestern United States". University of Albany)
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