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EASTERLY WAVE: An inverted, migratory wave-like disturbance or trough in the tropical region that moves from east to west, generally creating only a shift in winds and rain. The low-level convergence and associated convective weather occur on the eastern side of the wave axis. Normally, it moves slower than the atmospheric current in which it is embedded and is considered a weak trough of low pressure. It is often associated with possible tropical cyclone development and is also known as a tropical wave.
EASTERN NORTH PACIFIC BASIN: The region north of the Equator east of 140W. The National Hurricane Center in Miami, FL is responsible for tracking tropical cyclones in this region.
EL NIÑO: A warming of the Pacific Ocean currents along the coasts of Peru and Ecuador near the Equator that is generally associated with dramatic changes or a shift in the weather patterns of the region. A major El Niño event generally occurs every 3 to 7 years and is associated with changes in the weather patterns worldwide including hurricane.
EMERGENCY ALERT SYSTEM (EAS): A system designed to permit government officials to issue up-to-date and continuous emergency information and instructions to the public in case of a threatened or actual emergency. It is replacing the Emergency Broadcast System.
EMERGENCY PUBLIC INFORMATION: Information disseminated primarily, but not unconditionally, at the time of an emergency frequently includes actions, instructions and direct orders.
EMERGENCY PUBLIC SHELTER: Generally a public school or other such structure designated by county or city officials as a place of refuge. A volunteer group such as the American Red Cross or Salvation Army usually manages a shelter.
EMERGENCY OPERATIONS CENTER (EOC): A State, county, or city emergency facility that serves as a central location for the coordination and control of all emergency preparedness and response disaster activities.
EQUATOR: The geographic circle at 0 degrees latitude on the earth's surface. It is equal distance from the North and South Poles and divides the Northern Hemisphere from the Southern.
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