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Hurricanes are the storms which have winds with more than 74 mph of speed. Their strengths are calculated as per their current intensity depending upon the hurricane dean satellite image generated by nasa. With the help of topographic imagery, photo and ski images, the scientists can make weather forecasts which may also include forecasts about upcoming hurricanes. Basically there are five categories of hurricanes depending upon their speed:
• Category one: Winds between 74 to 95 mph: The storm surges are usually 4-5 feet above the normal tides. There are no real damages to the building structures but are usually related to anchoring of shrubbery, trees and mobile homes. Some minor pier damages and coastal road floods may also be expected.
• Category two: Winds between 96 to 110 mph: The storm surges are usually 6-8 feet above the normal tides. Damage to the roof material, window and doors of the buildings may be expected. Damages to trees and shrubbery are considerable and some trees may be seen blown down. There may be considerable damages to piers, poor signs and mobile homes. Low lying and coastal roads can be flooded at least 2-4 hours prior to the arrival of hurricane center. Boats in the unprotected anchorages can break moorings.
• Category three: Winds between 111 to 130 mph: The storm surges are usually between 9 to 12 feet above the normal tides. As the hurricane dean satellite image suggests, trees and shrubbery suffer damage, foliage blow off the trees and big ones blow down. Poorly constructed signs and mobile homes get destroyed and low-lying roads get flooded before 3-5 hours of hurricane arrival. Floods along the coast destroy small buildings and large ones are damaged by battering due to floating debris. Low-lying residential areas are required to be evacuated within numerous blocks in the coastline.
• Category four: Winds between 131 to 155 mph: The storm surges are usually between 13 to 18 feet above the normal tides. Damages due to the storm include extensive failure of structure with complete failure of roofs of small residences. All signs, trees, shrubs and topo are blown down and mobile homes get completely destroyed. Windows and doors of buildings suffer extensive damages and low-lying roads get flooded 3-5 hours prior to the hurricane arrival. Lower floors near the shoreline get damaged and areas around 6 miles may need to be evacuated.
• Category five: Winds more than 155 mph: The storm surges are usually more than 18 feet above the normal tides. Most of the industrial buildings and residences face complete roof failure and small buildings for utility get blown over. All trees, signs and shrubs get blown down and mobile homes get complete destroyed. Windows and doors of buildings get severely damaged and low lying roads get flooded 3-5 hours prior to arrival of the hurricane center. Massive evacuation is needed in an area as much as 5-10 miles from the shoreline.
Advanced hurricane dean satellite image may even help in predicting the exact date of the expected hurricane. It is very much similar to a gis based in colorado which allows the scientists to understand, view, interpret, visualize and question the data in different ways which reveal patterns, relationships and trends by way of maps, reports, charts and globes.
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