LECTURE_18_04-13-10_Katrina

LECTURE_18_04-13-10_Katrina - Climate/weather Hazards...

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Unformatted text preview: Climate/weather Hazards Hurricanes - Katrina Chap. 14 and Katrina case study Hurricane forecasting and early warning, mitigation, and future risk Storm hazards from Hurricane Katrina (overview) First-hand accounts MSU students (Julie Moore graduate student) ANNOUNCEMENTS: -Upcoming Video Quiz 3-National Geographic Video: Inside Hurricane Katrina - Thursday Forecasting Forecasting Watches and warnings are very practical hurricanes generally move slowly and give days of notice. Predicting exact path is more difficult. 1995 Pretince-Hall National Hurricane Center Fig. 14-25, p. 369 Focus evacuation on regions that will undergo the highest storm surge Florida Great Lakes North Carolina Storm surge highest on E of north-moving storm Storm surge highest on E of north-moving storm eye s u r g e w i n d s Mitigation Mitigation Building codes Formerly based on sustained wind; since Andrew being revised to peak wind gusts Land use planning in coastal areas Evacuation Storm surges and coastal flooding Barriers (Seawalls) Coastal barriers can work to some degree (with same problems as for tsunamis) Reconstruct beaches after storms Is Global Warming Increasing Is Global Warming Increasing Hurricanes Hurricanes There is some data to suggest that the intensity and number of large (Category 4 and 5) hurricanes is increasing with global temperature sea surface temperature is increasing => more evaporation Strong hurricane numbers have doubled since 1970; paths are longer However . . . Most meteorologists have argued that it isnt Not enough historical record Natural hurricane cycles indicate increased numbers in the next few years Weather and climate are two different things; US was unlucky in 2005. Affected by things like wind shear and steering currents Regardless, We are more in harms way Changes in the development of the Tampa, FL, area 1973 1992. More population along the coasts USGS 1973 1992 Mississippi River delta:- eroding, sinking Katrina: Category 3 at landfall early morning August 29, 2005- storm surge directed west into Lakes Bourne and Pontchartrain New Orleans - Setting New Orleans - Setting surge N e w O r l e a n s eye Gulf of Mexico Lake Pontchartrain Lake Borgne New Orleans Louisiana Mississippi Bay St....
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LECTURE_18_04-13-10_Katrina - Climate/weather Hazards...

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