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Class #23: Friday October 23. The Extratropical or Midlatitude Cyclone. The story of an extratropical cyclone. Day 1, Sat., Nov. 8,1975: Low (Panhandle Hook) forms just NE of Amarillo Day 2, Sun., Nov. 9: Ship sails at 2 p.m.; Storm has matured to young adult stage - PowerPoint PPT Presentation

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  • Class #23: Friday October 23The Extratropical or Midlatitude Cyclone*Class #23: October 23

    Class #23: October 23

  • The story of an extratropical cycloneDay 1, Sat., Nov. 8,1975: Low (Panhandle Hook) forms just NE of AmarilloDay 2, Sun., Nov. 9: Ship sails at 2 p.m.; Storm has matured to young adult stageDay 3, Mon., Nov. 10: The storm is occluding. Ship sinks at 7:20 p.m.Day 4, Tues., Nov. 11: The storm is dying Subtract 7 from date to get Day #

    Class #23: October 23*

    Class #23: October 23

  • Sank on Day 4Class #23: October 23*Fig. 10-1, p. 276

    Class #23: October 23

  • Ore freighter Edmund FitzgeraldClass #23: October 23*Fig. 10-2, p. 277

    Class #23: October 23

  • North is at lower right. Ship sank near Whitefish PointClass #23: October 23*Fig. 10-4, p. 278

    Class #23: October 23

  • Day 1 and Day 2Class #23: October 23*Table 10-1a, p. 279

    Class #23: October 23

  • Table 10-1b, p. 279*Class #23: October 23

    Class #23: October 23

  • Day 1 weather maps: Low forms NE of Amarillo, TXClass #23: October 23*Fig. 10-5, p. 280

    Class #23: October 23

  • Birth to NW of AmarilloClass #23: October 23*Fig. 10-5a, p. 280

    Class #23: October 23

  • Strong westerlies upstreamClass #23: October 23*Fig. 10-5b, p. 280

    Class #23: October 23

  • Low humidity, clear skiesClass #23: October 23*Fig. 10-5c, p. 280

    Class #23: October 23

  • Typical cyclone pathsDepend on topographyDepend on position of the polar frontDepend on upper level winds:Extratropical cyclones move approximately with the 500mb wind at about half the speedClass #23: October 23*Fig. 10-6, p. 281

    Class #23: October 23

  • Fig. 10-6a, p. 281*Class #23: October 23

    Class #23: October 23

  • Fig. 10-6b, p. 281*Class #23: October 23

    Class #23: October 23

  • Fig. 10-6c, p. 281*Class #23: October 23

    Class #23: October 23

  • Shows Panhandle hook path

    Class #23: October 23*Fig. 10-6d, p. 281

    Class #23: October 23

  • Ingredients for a cycloneCyclone growth is called cyclogenesisCyclogenesis requires 3 ingredients:Surface temperature gradients: a frontA strong jet stream: helps the low grow and the fronts intensifyMountains or other surface boundaries (for example, a coastline along a warm ocean currentCyclones get their energy in a process called baroclinic instabilityrelated to horizontal temperature gradients and vertical wind shearClass #23: October 23*

    Class #23: October 23

  • Cyclonic spin (or vorticity) is important for cyclogenesis. Class #23: October 23*Box 10-1, p. 282

    Class #23: October 23

  • Cyclonic spin is generated by flow over mountainsClass #23: October 23*Box 10-1, p. 283

    Class #23: October 23

  • Day 2: Young adult stageClass #23: October 23*Fig. 10-7, p. 285

    Class #23: October 23

  • Note fronts, Low, and path. Ship sets sail at 2 p.m.Class #23: October 23*Fig. 10-7a, p. 285

    Class #23: October 23

  • Note upper-level short-wave trough to west of surface LowClass #23: October 23*Fig. 10-7b, p. 285

    Class #23: October 23

  • Back to the storyThe cyclone moves very rapidly, steered by the upper-level winds at 500mb.On Day 2 (Nov. 9) gale warnings were issued in the mid-afternoon for the next day (Monday, Day 3, Nov. 10)Gale warnings are for winds up to 38 knots (44 mph), not typical, not too unusualShips take the northern, longer route

    Class #23: October 23*

    Class #23: October 23

  • Satellite picture from 10:12 a.m.Note the comma shape of cloudClass #23: October 23*Fig. 10-7c, p. 285

    Class #23: October 23

  • A close-up of last slideClass #23: October 23*Fig. 10-8, p. 286

    Class #23: October 23

  • Fig. 10-9, p. 287*Class #23: October 23

    Class #23: October 23

  • Fig. 10-10, p. 288*Class #23: October 23

    Class #23: October 23

  • Fig. 10-10a, p. 288*Class #23: October 23

    Class #23: October 23

  • Fig. 10-10b, p. 288*Class #23: October 23

    Class #23: October 23

  • Fig. 10-10c, p. 288*Class #23: October 23

    Class #23: October 23

  • Fig. 10-11, p. 289*Class #23: October 23

    Class #23: October 23

  • Fig. 10-12, p. 290*Class #23: October 23

    Class #23: October 23

  • Fig. 10-13, p. 291*Class #23: October 23

    Class #23: October 23

  • Fig. 10-14, p. 292*Class #23: October 23

    Class #23: October 23

  • Fig. 10-14a, p. 292*Class #23: October 23

    Class #23: October 23

  • Fig. 10-14b, p. 292*Class #23: October 23

    Class #23: October 23

  • Fig. 10-14c, p. 292*Class #23: October 23

    Class #23: October 23

  • Box 10-2, p. 293*Class #23: October 23

    Class #23: October 23

  • Box 10-2, p. 293*Class #23: October 23

    Class #23: October 23

  • Fig. 10-15, p. 294*Class #23: October 23

    Class #23: October 23

  • Fig. 10-16, p. 295*Class #23: October 23

    Class #23: October 23

  • Fig. 10-17, p. 295*Class #23: October 23

    Class #23: October 23

  • Box 10-3, p. 297*Class #23: October 23

    Class #23: October 23

  • Box 10-3, p. 297*Class #23: October 23

    Class #23: October 23

  • Box 10-3, p. 298*Class #23: October 23

    Class #23: October 23

  • Box 10-3, p. 298*Class #23: October 23

    Class #23: October 23

  • Box 10-3, p. 299*Class #23: October 23

    Class #23: October 23

  • Box 10-3, p. 299*Class #23: October 23

    Class #23: October 23

  • Fig. 10-18, p. 301*Class #23: October 23

    Class #23: October 23

  • Fig. 10-18a, p. 301*Class #23: October 23

    Class #23: October 23

  • Fig. 10-18b, p. 301*Class #23: October 23

    Class #23: October 23

  • Fig. 10-18c, p. 301*Class #23: October 23

    Class #23: October 23

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