Severe Weather Patterns

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Presentation transcript:

Severe Weather Patterns

Hurricanes Form Over Warm Ocean Water Near the equator, warm ocean water provides the energy that can turn a low-pressure center into a violent storm. A tropical storm is a low-pressure system that starts near the equator and has winds that blow at 40 mph. A hurricane is a tropical low-pressure system with winds blowing at speeds of 74 mph. Hurricanes are called typhoons or cyclones when they form over the Indian Ocean or Western Pacific Ocean.

Formation of Hurricanes In the eastern United States, hurricanes most often strike between June and November. Tropical storms and hurricanes generally move westward with the trade winds. As soon as a hurricane moves over land or cooler water, it loses its source of energy.

Formation of Hurricanes At the center of a hurricane is a small area of clear weather 10-30mi in diameter, called the eye. The storm’s center is calm because air moves downward there. Just around the eye, the air moves very quickly around and upward, forming a tall ring of cumulonimbus clouds called the eye wall. This ring produces very heavy rains and tremendous winds.

Video on Formation of Hurricanes http://abcnews.go.com/US/hurricanes-form-explained-abc-news-chief- meteorologist-ginger/story?id=49650211

Effects of Hurricanes These storms can cause damage and dangerous condition. Hurricanes can lift cars, uproot trees, and tear the roofs off buildings. When a hurricane moves into a coastal area, it often pushes a huge mass of ocean water called a storm surge. The National Hurricane Center helps people know when to prepare for a hurricane.

Winter Storms Produce Snow and Ice The National Weather Service alerts people to dangerous weather. A warning means that the dangerous conditions are already present or will affect an area shortly. Blizzards are blinding snowstorms with winds of at least 35 mph and low temperatures usually below 20. Some of the heaviest snows fall in the areas of just east and south of the Great Lakes. Cold air from the Northwest gains moisture and warmth as it passes over the Great Lakes. Over cold land, the air cools again and releases moisture as snow.