om_7 - Ocean in Motion 7 El Nino and Hurricanes A Overview...

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©1998 Project Oceanography Spring Series Ocean in Motion 1 Ocean in Motion 7: El Nino and Hurricanes! A. Overview 1. Ocean in Motion -- El Nino and hurricanes We will look at the ocean-atmosphere interactions that cause El Nino and hurricanes. Using vocabulary and terms learned in the earlier broadcasts, we will briefly discuss the changes in the ocean and the atmosphere that must occur to cause these phenomenon. Consequences of each will be discussed. Materials for this broadcast were gathered from local television and radio stations. You might want to contact your local television station to obtain materials about El Nino and hurricanes, and their effects on your local weather patterns. 2. Contents of Packet Your packet contains copies of the following activities: I. Local El Nino effects. II. Atlantic Hurricane Tracking Map. B. Program Preparation 1. Focus Points O What is El Nino? a. decreasing strength or reversal of trade wind direction b. weather pattern changes c. high and low pressure system changes d. influence on world climate e. result is drought and flooding f. opposite phenomenon is called a La Nina O What is a Hurricane (Atlantic Ocean) or Typhoon (Pacific Ocean) or Cyclone (Indian Ocean)? a. strong storm with rain, wind and flooding b. formation of a hurricane c. devastating rain, and flooding d. giving a storm a name
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©1998 Project Oceanography Spring Series Ocean in Motion 2 2. Program preparation Words to know: El Nino - a change of pressure in a persistent high pressure cell is the Southeastern Pacific Ocean and a persistent low pressure cell over the East Indies Typhoon - a severe tropical storm in the western Pacific Hurricane- tropical cyclone in which winds reach velocities above 120 km/h cyclonic - rotation of storms about a low pressure center in Northern Hemisphere, high pressure in Southern Hemisphere Tropical storm - tropical cyclone having winds ranging between 48 to 121 kph or 30 to 70 mph equator - zero degrees latitude circumscribing the earth dividing the Northern and Southern Hemisphere anticyclonic - rotation of storms about which a high pressure system rotates in the N. Hemisphere,
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om_7 - Ocean in Motion 7 El Nino and Hurricanes A Overview...

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