True (A)/False (B) 31. In order for a hurricane to form, the layer of warm water

Question

True (A)/False (B)

31. In order for a hurricane to form, the layer of warm water must extend from the ocean surface to a depth of about 400 feet.

32. During a storm surge, water levels along the coast typically rise only about 2 feet.

33. Polar hurricanes have the same physical structure and wind speed as tropical hurricanes.

34. The clouds that form the hurricane develop best when there is strong vertical wind shear over the tropics.

35. The typhoons of the tropical Pacific are stronger and are twice the number of the Atlantic hurricanes.

36. The hurricane with a central pressure of 990 mb is more powerful than another hurricane with a central pressure of 870 mb.

37. It would be correct to call the fifth tropical storm of the hurricane season Faculae.

38. Consistently negative values of the SOI indicate the presence of El Nino

Explanation / Answer

31. In order for a hurricane to form, the layer of warm water must extend from the ocean surface to a depth of about 400 feet.

ANS – False as Hurricanes only form over really warm ocean water of 80°F or warmer. The atmosphere (the air) must cool off very quickly the higher you go. Also, the wind must be blowing in the same direction and at the same speed to force air upward from the ocean surface. Four factors contributing - Sea surface temperatures warmer than 79 degrees Fahrenheit (26 degrees Celsius), Low vertical wind shear, Warm moist air and Ocean area along the projected storm track

32. During a storm surge, water levels along the coast typically rise only about 2 feet.

ANS – False as a storm surge is a rise in sea level that occurs during tropical cyclones, intense storms also known as typhoons or hurricanes. The storms produce strong winds that push the water into shore, which can lead to flooding. This makes storm surges very dangerous for coastal regions.

33. Polar hurricanes have the same physical structure and wind speed as tropical hurricanes.

ANS – False as Hurricanes don't form in the Polar Regions because a storm does not receive the classification of hurricane strictly due to wind speed. There have been plenty of low pressures in the Polar Regions that have been strong enough to generate winds high enough to earn the title hurricane

34. The clouds that form the hurricane develop best when there is strong vertical wind shear over the tropics.

ANS – True as only tropical cyclones that form over the Atlantic Ocean or eastern Pacific Ocean are called "hurricanes." Whatever they are called, tropical cyclones all form the same way. Tropical cyclones are like giant engines that use warm, moist air as fuel. That is why they form only over warm ocean waters near the equator.

35. The typhoons of the tropical Pacific are stronger and are twice the number of the Atlantic hurricanes.

ANS – False as Pacific typhoon season is an ongoing event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the western Pacific Ocean. The season runs throughout 2017, though most tropical cyclones typically develop between May and October.

36. The hurricane with a central pressure of 990 mb is more powerful than another hurricane with a central pressure of 870 mb.

ANS – False as lower pressure is more powerful.

37. It would be correct to call the fifth tropical storm of the hurricane season Faculae.

ANS – False as the fifth tropical storm of the Eastern Pacific season formed, being assigned the name Estelle.

38. Consistently negative values of the SOI indicate the presence of El Nino.

ANS – True as the SOI is calculated using the pressure differences between Tahiti and Darwin. Sustained negative values of the SOI below ?7 often indicate El Niño episodes.

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