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Chap. 5.6 Hurricanes

Chap. 5.6 Hurricanes. 5.6.1 Hurricane : introduction 5.6.2 Hurricane structure 5.6.3 Hurricane : theory 5.6.4 Forecasting of hurricane. Sommaire chap.5. sommaire. 5.6.1 Hurricane : introduction. Dina, 22/01/2002 image infrarouge colorée. Source : Météo-France.

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Chap. 5.6 Hurricanes

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  1. Chap. 5.6 Hurricanes 5.6.1 Hurricane : introduction 5.6.2 Hurricane structure 5.6.3 Hurricane : theory 5.6.4 Forecasting of hurricane Sommaire chap.5 sommaire

  2. 5.6.1 Hurricane : introduction Dina, 22/01/2002 image infrarouge colorée. Source : Météo-France • Helpful hurricane links : • a great start ! http://hurricanes.noaa.gov • FAQ about hurricanes • http://www.aoml.noaa.gov/hrd/tcfaq/tcfaqHED.html • hurricane history and climatology • http://www.nhc.noaa.gov/pastall.shtml • Here is a more advanced guide to tropical cyclone forecasting • http://www.bom.gov.au/bmrc/pubs/tcguide/globa_guide_intro.htm

  3. 5.6.1 Hurricane : introduction Dina, 22/01/2002 image infrarouge colorée. Source : Météo-France • Atmospheric phenomenonthe most violent on earth : • 327 km/h , Gilbert in 1990 • 1825 mm/day (Hyacinthe, Réunion, 80) • and 5678 mm in 10 days • 870 hPa (Tip, 79) and 888 hPa (Gilbert, 88)

  4. 5.6.1 Hurricane : introduction Over N. Atlantic N. and N. Pacific, classification SAFFIR/SIMPSON is used and established a link between MSLP, speed wind and damages. Pressure and wind are either measured by drop sond or more commonly estimated by the cloud-shape induced by satellite picture SAFFIR/SIMPON scale :

  5. 5.6.1 Hurricane : introduction Dina, 22/01/2002 image infrarouge colorée. Source : Météo-France • Phenomenon with a great complexity : interactions between different scales, between ocean/atmosphere, convection, rotation, boundary layer. • Theory is always under construction (lack of measure • campaigns of dense observations), so this course put the • stress especially on the structure of hurricanes

  6. 5.6.1 Hurricane : introduction KATRINA, août 2005; Source : NOAA • An hurricane is a thermal engine which tranfers energy from the ocean to the atmosphere and from close-equatorial regions towards polewards area (tropics or mid-latitudes). • The energy amount delivered is tremendous • (5 atomic bombs H /s or 2 to 6.106 Joules/day) = the most violent atmospheric phenomenon on earth (20 000 death/year, 6 to 7 milliards $ losses/ year) 5.6.2 : structure

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