EESA09H3 Lecture 4: Wind Lecture 4 – September 24th – Hurricanes
30 Dec 2015
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Document Summary
3 conditions: normal, el nino (warm face), and la nina (native face) Thermal cline is pushing up and therefore indicates upwelling of cold water to replace the warm water (which. = more nutrients, and is useful for fish farming) Plenty of precipitation along the western coast. Warm water from western equatorial pacific slides back to eastern equatorial pacific. Western pacific experience droughts during el nino (even though normally wet), eastern pacific very heavy rains (normally dry) Steeper incline (where the temperature gets warmer) In general all hurricanes are tropical storms (occurring in a stropical region) with winds of 18ms to 33m/s. A hurricane is not considered a hurricane unless it has a wind speed of 33m/s to 50m/s. Major hurricane is a bigger scale than hurricane exceeds 50m/s. Measured by saffir-simpson scale: herbert saffir, consulting engineer, robert simpson, director, national hurricane centre (usa) 26. 5 degrees celsius is necessary (if you notice, hurricanes wont really happen in the winter)
