Hurricans – Mean Season Mean Season Hurricanes are an environmental disaster. People in hurricane-prone regions most want to know: when and where the next hurricane will make landfall and just how powerful the storms will be when they do hit. For the most accurate warning possible, people rely on the meteorologists. Still a few tenacious problems remain, like that forecasters cannot always predict weather nor how much a hurricane will intensify before it hits land. Thats a problem for people in the path of a storm who need to know if its enough just to nail plywood across the windows, or if they should leave town altogether. The need for better hurricane forecasting will become more urgent now as well as in the future to come.
It will not take more than a handful of major hurricanes striking land on the crowded and densely developed U.S. East Coast to cause damage in the tens of billions of dollars. Forecasters rely on trends in the global climate that coincide with the ups and downs of Atlantic hurricane activity. One predictor, the warming of the equatorial Pacific, disrupts weather across much of the globe. Shifts in air circulation disrupt the vertical circulation in Tropical storms, which prevent them from growing into hurricanes. Scientists are sure that Atlantic hurricanes assemble over Africa.
The collision of hot, dry air over the Sahara Desert, including warm, moist air from the equatorial jungle will give birth. The collision will cause disturbances in the atmosphere called Hurricane Seedlings. Each season there is about 60 seedlings blown west into the Tropical Atlantic by the trade winds. At first, Seedlings are nothing more than clusters of thunderstorms, but in an average year, nine will evolve into named tropical storms and about six become hurricanes. On their way across the ocean, seedlings feed on the heat in warm surface water.
Pressure in the center of a disturbance falls as the air inside it grows warmer and lighter. The hurricane then gains spin due to the earths rotation. Due to earths gravity pull, storms revolve counterclockwise in the Northern Hemisphere. When the disturbance closes in on itself and becomes a discrete, rotating storm, it’s classified as a Tropical Depression. When winds reach up to 40mph it becomes a tropical storm. At that point it’s given a name by the size and strength of the storm.
When winds reach 74mph, it then becomes a hurricane. The rule of evaporation, condensation, and transportation of heat is very important to understand a hurricane. A hurricanes strength then recorded and annualized to calibrated on the Suffix Simpson intensity scale. The system takes into account central storm pressure, maximum winds and potential for storm surge. A storm surge produces the wall of water hurricanes bulldoze ahead of them selves. Category one, type of storm having sustained winds of 74-95mph that usually do only minor damage. Categories three-five hurricanes can have catastrophic effects.
For example, the surge from just one of category fours many storms drowned some 6,000 people in Galveston TX. in 1990. Dramatic changes in hurricane intensity occur when storms undergo a process called rapid deepening. Rapid deepening is a sudden pressure drop in the storm. This speeds up the circulation in the eye-wall. Rapid deepening can transform categories’ one or two storms into categories’ four or five storms in just two days. It’s not entirely clear how this takes place.
Hurricanes take the lives of thousands of people every day! There is no way of warning people in enough time to clear the path of a major storm. WE CAN ONLY HOPE. Geography.