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Severe Weather Storms.

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Presentation on theme: "Severe Weather Storms."— Presentation transcript:

1 Severe Weather Storms

2 Objectives List and describe the main types of storms and explain how they form Standards: S6E4.b – Relate unequal heating of land and water surfaces to form large global wind systems and weather events such as tornadoes and thunderstorms. S6E4.c – Relate how moisture evaporating from the oceans affects weather patterns and the weather events such as hurricanes.

3 STORMS A storm is a violent disturbance in the atmosphere.
They involve sudden changes in air pressure. Changes in air pressure causes rapid air movement (wind).

4 Thunderstorms Formation Temperature Precipitation Safety
Within large cumulonimbus, or thunderheads Form when warm air is forced upward at a cold front Temperature Hot, humid afternoons in the spring and summer Precipitation Heavy rainfall Sometimes hail Safety Avoid touching metal objects Install metal lightening rods Find a low area away from trees Stay away from water

5 Thunderstorms During a thunderstorm, positive and negative electrical charges build up in the clouds. The discharge of the electricity between clouds is lightening. Lightening is as hot as 30,000°C, hotter than the sun. The heated air expands and explodes producing thunder.

6 Checkpoint What is El Nino? What is a storm?
Weather pattern related to the temperature of the water in the tropical Pacific Ocean. Any type of violent disturbance in the atmosphere.

7 Tornado Rapidly whirling, funneled-shaped cloud that reaches down from a storm cloud to touch Earth’s surface Most frightening & disruptive storm Usually brief, touching the ground approx. 15 minutes or less Wind speeds may reach 480 km/hr

8 Tornado Formation Precipitation Safety Temperature
Develop in low, heavy cumulonimbus clouds When warm dry air mass and cool air mass collide Temperature Warm humid air Spring and early summer when ground is warm Precipitation Heavy rain and wind Safety Listen for watches & warnings Basement level, or to the middle room on ground floor Stay away from windows Lie in a ditch

9 Tornado Tornado Watch – tornadoes are possibly in your area
Tornado Warning – tornadoes have been seen in the sky or on weather radar Occur most often in the US Approx. 800 tornadoes a year

10 Checkpoint Where do tornadoes form? Why is there a tornado valley?
What states make up tornado valley? Low heavy cumulonimbus clouds Warm humid air mass moves north from Gulf of Mexico and meets a cold dry mass that is moving south from Canada SD, Iowa, Nebraska, Kansas, Missouri, Oklahoma, TX, NM, and Arkansas

11 Hurricanes Tropical storm that has winds of 119 km/hr
Usually occur between June and November in the eastern US Hurricanes that occur in western US are called typhoons Bring much needed rainfall to S Asia & SE Asia

12 Hurricanes Formation Temperature Precipitation Safety
Begins over warm water as a low pressure area, tropical disturbance Gets its energy from warm humid air at the ocean’s surface Temperature Warm temperatures Precipitation Strong winds Rain which generally causes flooding Safety Evacuate Move into the interior room and stay away from windows

13 Hurricanes Occur between June and November
Effect people that live on the coast of the Atlantic, Pacific, and Indian Oceans Hurricanes bring needed rainfall to S Asia and SE Asia Eye – center of a hurricane

14 Winter Storms Lake-effect Snow – In the fall and winter, land cools faster than the lakes. When cool air mass moves from Canada across Great Lakes it picks up water vapor and heat from lakes. After the air mass passes the lakes it begins to cool and the water vapor condenses and falls as snow

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