Class #18: Friday, October 8

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Class #18: Friday, October 8. Chapter 8 Tropical Cyclones. Review sheet for test #2. Test is on Wednesday, October 13 Test covers chapters 6, 7, 8 except for the material in boxes 6.1 (p.162), 6.2 (pp. 168-9), 6.3 (pp. 176-7), 7.1 (p.196), and 7.2 (p.204). - PowerPoint PPT Presentation

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  • Class #18 Friday, October 8, 2010Class #18: Friday, October 8Chapter 8 Tropical Cyclones

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    Class #18 Friday, October 8, 2010

  • Review sheet for test #2 Test is on Wednesday, October 13Test covers chapters 6, 7, 8 except for the material in boxes 6.1 (p.162), 6.2 (pp. 168-9), 6.3 (pp. 176-7), 7.1 (p.196), and 7.2 (p.204). Format of the test will be similar to test #1Class #18 Friday, October 8, 2010*

    Class #18 Friday, October 8, 2010

  • Fig. 8-29, p. 235

  • More about the life cycle of tropical cyclonesSome go on to become extratropical cyclones in middle latitudesIn the Western Pacific Ocean, an occasional typhoon will go on to become a supertyphoon. These have sustained winds > 150 miles per hourA widening eye usually indicates a weakening of the stormClass #18 Friday, October 8, 2010*

    Class #18 Friday, October 8, 2010

  • More about the life cycle of a tropical cycloneOn a day to day basis, the intensity of tropical cyclones is influenced by the sea surface temperatures it encounters.The hurricane season of 2005 broke many records for tropical cyclones27 named storms in the North AtlanticClass #18 Friday, October 8, 2010*

    Class #18 Friday, October 8, 2010

  • Fig. 8-30, p. 236

  • Fig. 8-31, p. 237

  • How hurricanes cause destructionWinds: hurricanes are classified as to wind damage using the Saffir-Simpson scale from 1 (weakest) to 5 (strongest)Hurricanes can contain mini-swirls that are tornado-sized with even stronger winds than the main hurricaneClass #18 Friday, October 8, 2010*

    Class #18 Friday, October 8, 2010

  • Fig. 8-32, p. 239

  • Table 8-3, p. 240

  • How hurricanes cause destructionThe storm surge is the process of wind-induced seawater floodingCauses 90% of hurricane deathsWorst at high tide (new and full moon)Worst with strong windsWorst with lowest sea-level pressureWorst with low-lying landDepends on coastal and underwater shapeClass #18 Friday, October 8, 2010*

    Class #18 Friday, October 8, 2010

  • How hurricanes cause destructionRainwater causes flooding From 1970-2000 more deaths were caused by flooding than other types of hazards in hurricanesMassive flooding can occur with even weak tropical cyclones or tropical stormsHurricane rains have some beneficial effectsClass #18 Friday, October 8, 2010*

    Class #18 Friday, October 8, 2010

  • Fig. 8-33, p. 241

  • How hurricanes cause destructionFlooding from tropical storm Allison in June 2001 killed at least 20 people and damaged houses with costs near $5 billionAllison caused rain in every Gulf and Atlantic state from Texas to MaineAllison caused nearly 36 inches of rain in Houston, TX Class #18 Friday, October 8, 2010*

    Class #18 Friday, October 8, 2010

  • Fig. 8-34, p. 242

  • Forecasting and tracking hurricanesThe story of Bryan NorcrossBroadcast weather information during hurricane Andrew in Florida in 1992Andrew was a category 5 hurricaneNorcross remained on the air when many of the other stations were off the airHe broadcast forecasts and valuable information about safety in hurricanesClass #18 Friday, October 8, 2010*

    Class #18 Friday, October 8, 2010

  • Box 8-3, p. 243

  • Box 8-3, p. 243

  • Flooding in Hurricane HugoFig. 8-35, p. 244

  • Fig. 8-36, p. 245

  • Fig. 8-37, p. 245

  • Fig. 8-38, p. 246

  • Long-term forecasting of hurricanesThese forecasts are less than perfectThey rely heavily on the cycles of El Nio and La Nio for forecasting in the North AtlanticClass #18 Friday, October 8, 2010*

    Class #18 Friday, October 8, 2010

  • Fig. 8-39, p. 247

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