Meteorology
Chapter 11 Worksheet 1 Name: ________________________________
Circle the letter that corresponds to the correct answer 1) When occurring in the Atlantic Ocean they are known as hurricanes. What are they known as when occurring in the western Pacific? a) typhoons b) tropical breezes c) tsunamis d) cyclones 2) The ________ has the greatest number of storms, averaging 20 per year. a) North Atlantic b) South Atlantic c) North Pacific d) South Pacific 3) What is the difference between a typhoon and a hurricane? a) A hurricane is a true tropical cyclone, but a typhoon is not. b) A hurricane is stronger than a typhoon. c) They represent different phases in the development of a tropical storm. d) They occur in different ocean basins. 4) What are hurricanes known as in the Indian Ocean, including the Bay of Bengal and Arabian Sea? a) tropical breezes b) typhoons c) cyclones d) tsunamis 5) What general circulation wind belt is the place of origin for hurricanes? a) westerlies b) trade winds c) doldrums d) horse latitudes 6) Compared to the North Atlantic, hurricanes form in the South Atlantic: a) much less frequently. b) more frequently. c) with about the same frequency and intensity. d) with about the same frequency, but with much less intensity. 7) What is the approximate diameter of a mature hurricane? a) 50 ‐100 km b) 50 km or less c) about 1000 km d) about 600 km e) more than 1000 km 8) Why do hurricanes initially form only in the tropics? a) Warm water temperatures are found there. b) Stronger pressure gradients are found there. c) Coriolis is weaker there. d) Subsiding air currents are found there. 9) What causes the winds of a hurricane to be so fast? a) coupling with the jet stream b) stronger Coriolis force c) very strong pressure gradient force d) tidal effects e) weaker Coriolis force 10) Why don't hurricanes develop on or near the Equator? a) The Coriolis effect is too weak to create rotation. b) The ITCZ inhibits the growth of the hurricane's thunderstorms. c) The water is too warm to allow for the storm's development. d) The question is false; hurricanes develop on the Equator all the time! 11) Hurricanes form a) between 35 degrees and 50 degrees latitude. b) between 20 degrees and 35 degrees latitude. c) at the equator. d) at various latitudes depending upon local conditions. e) between 5 degrees and 20 degrees latitude. 12) A hurricane must have sustained wind speeds of at least: a) 64 miles per hour. b) 94 miles per hour. c) 84 miles per hour. d) 74 miles per hour. 13) To officially be a hurricane, the disturbance must have rotary circulation and have wind speeds of at least ________ kilometers per hour. a) 70 b) 119 c) 195 d) 92 e) 161 14) The doughnut‐shaped wall of intense convective activity surrounding the center of the storm is called the: a) eye. b) eye ring. c) eye wall. d) core. 15) Why do surface wind speeds increase toward the center of a hurricane? a) reduced friction b) stronger Coriolis effect c) conservation of angular momentum d) warmer water 16) What type of clouds is most common in a hurricane? a) cumulonimbus b) cirrus c) nimbostratus d) stratus 17) The eye wall of a hurricane: a) has the greatest wind speeds. b) lies at the hurricane's outer edge. c) has the lightest precipitation. d) has the highest barometric pressure. 18) The very center of a hurricane is called the: a) eye. b) eye ring. c) eye wall. 19) Hurricanes develop most often in the late summer when ocean waters have reached what temperature? a) 50 °F b) 80°F c) 60°F d) 70°F e) 100°F 20) The outflow at the top of a hurricane prolongs the storm's lifespan because: a) it provides an outlet for excess moisture that might otherwise "rain out" the storm. b) it causes winds to converge at the top of the storm. c) it prevents surface convergence from "filling in" the low‐pressure center of the storm. d) it helps to bring in cold air to strengthen the hurricane's eye. Circle “T” if the statement is true or “F” if the statement is false T F 21) Tornadoes are cyclonic while hurricanes are anticyclonic.
T F 22) In the western Pacific, hurricanes are called typhoons.
T F 23) The term hurricane is derived from Huracan, a Carib god of evil.
T F 24) The Coriolis force does not play a role in hurricane circulations.
T F 25) The largest number of hurricanes form right along the equator.
T F 26) Hurricanes can form over tropical land masses as well as over tropical oceans. T F 27) Hurricanes do not form within about 5 degrees latitude of the equator. T F 28) More hurricanes form in the South Atlantic and the eastern South Pacific than in any other regions. T F 29) Hurricanes in the Indian Ocean are called cyclones.
T F T F T F 30) Each year between 100 and 200 tropical storms develop around the world. 31) Hurricane wind speeds are fastest near the center of the eye.
32) The tallest and most vigorous part of the hurricane is the eye wall region. Answer the following questions 33. What are the peak months for hurricane activity in the North Atlantic? 34. Name two retired names of hurricanes.