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Terms in this set (31)
What is a storm
A violent disturbance in the atmosphere. Sotrms involve sudden changes in air pressure, which in turn cause rapid air movements.
Conditions that bring one kind of sotrm often cause other kinds of sotrms in the same area. For example, the conditions that cause thunderstroms can also cause tornadoes. There are several types of severe storms.
What is a fulgurite
A fulgurite forms when lightening strikes sand or sandy soil. The temperature of the lightening is so hight that it melts the sand and forms a tube
What is a thunderstorm
A thunderstorm is a small storm accompanied by precipitation.
What kind of clouds do thunderstorms form in
form in large cumulonimbus clouds, also known as thunderheads. Most cumulonimbus clouds form on hot humid afternooons.
How do thunderheads form
The warm, humid air rises rapidly and the air cools forming dense thunderheads. Heavy rain falls, sometimes along with hail. Within the clouds there are strong upward and downward winds- updrafts and down drafts.
What is lightening
During a thunderstorm areas of positive and negative electrical charges buid up in the storm cloud. Lightening is a sudden spark, or electircal discharge, as these charges jump between parts of a cloud, between nearby clouds or the ground. Lightening is similar to the shocks you sometims feel when you touch a metal object on a very dry day, but on much larger scale.
What causes thunder
A lightening bold can hear the air near it as much as 30,000C, much hotter than the sun's surface. The rapidly headet air expands suddenly and explosively. Thuder is the shound of hte explosion. Because light travels much faster than sound, you see the lightening before you hear the thunder.
What comes first in a thunder storm ?
Because light travels much faster than sound, you see the lightening before you hear the thunder.
How do you figure out the distance from a thunderstorm
Dived the number of seconds between the lightening and thunder by 3 w
What happens when lightening strikes people
It acts like a powerful electric shock. Can cause unconcsiousnes, serious burns or even heart failure.
How do floods occur during a storm
A majour danger during severe thunderstorms is flooding. Floods occur when so much water pours into a stream or river that its banks overflow, covering the surrounding land. A flash flood is a sudden violent flood that occurs shortly after a storm.
The safest place to be is indoors. Do not touch wires(e.g. telephones, electrical appliance) they all conduct electricity. It is usually safe to stay in a car. Do not touch any metal inside the car.
Avoid places where lightening may strike. Also avoid objects that can conduct electricity, such as metal objects and bodies of water.
How do you remain safe outside in a thunderstorm
Don't go under a tree.
Go to a low area and crouch. If are swimming or in a boat get out to land.
Most destructive storm
A rapidly whirling funnel shaped cloud that reaches down from a storm cloud to touch Earth's surface. If a tornado occurs over a lake or ocean, the sotrm is known as a waterspout. Tornadoes are usually brief, but can be deadly. They may touch the gorund for 15 minutes or less and be only a few hundred meters across. But wind speeds in most intense tornadoes may approach 500 km per hour.
How do Tornadoes form
Can form in any situation that produces severe weather. Most commonly develop in thick cumulonimbus clouds - the same clouds that bring thunderstorms. Tornadoes are most likely to occur in spring and early sumer.
A warm humid air mass moves north from the Gulf of Mexico into the Great Plains. A cold, dry air mass moves south from Canada. When the air masses meet, the cold air moves under the warm air, forcing it to rise. A squall line of thunderstorms is likely to form, with storms traveliing from southwest to northeast. A single squall line can produce ten or more tornadoes.
Tornadoes occur more often in the US than in other country. About 800 tornadoes occur in the US every year. Weather patterns on the Great Plains result in a "tornado alley"
How does a tornado cause damage
Tornado damage comes from both strong winds and flying debris. The low pressure inside the tornado sucks dust and other objects into the funnel. Tornadoes can move large objects - sheds, trailers, cars - and scatter debris many miles away.
they are undpredictable - one persons house can be leveled while another one is standing.
What should you do if a tornado is predicted in your area
Safest placed is a sherlter or the basement of a well built building. Stay away from windows and doors to avoid flying debris. If you are outdoors, lie flat in a ditch.
How do hurricanes form
Typically forms in the atlantic ocean north of the equator in August, September or October.
A hurricane begins over warm water as a low-pressure area, or tropical disturbance. If it grows in size and strength it becomes a tropical storm and then may become a hurricane.
They draw energy from the warm humind air at the ocean's surface. As this air rises and forms clouds, more air is drawn into the system. Inside the storm are bands of very high winds and heavy rands. Winds spiral inward toward the area of lowest pressure at the center. The lower the air pressure at the center of a storm, the faster the wind blow toward the center.
Where do winds blow fastest in a hurricane and why
In a narrow band around the center.. the lower air pressure at the center of the storm the faster the wind blows...
Where are hurricane winds are strongest
Around the center of the storm. At the center is a ring of clouds, called the eyewall, that encircle a quiet "eye". In the eye, winds are calm and skies may clear. Winds on the other side of eye blow in the opposite direction.
Storms last one week or more. They are steered by easterly trade winds toward Caribbean and southeast USA. Over land, storm weakens from lack of warm moist air. Rain may last several more days.
High winds, flooding up to six meters above normal sea level (storm surge).
"Dome" of water that sweeps across coast where hurricane lands eroding beaches, coastlines, and destroying buildings.
What is a hurricane watch
A hurricane watch indicates that hurricane conditions are possible in the next 36 hours, and you should be prepared to evacuate.
How to prepare for a hurricane
if you hear a hurricane watch be prepared to be evacuate
a hurricane warning means hurricane conditions are expected in the next 24 hours.
Precipitation in Clouds
All year round, precipitation starts in clouds as snow, if the air is 0 degrees celsius or below, then the snow stays snow.
lake Effect Snow why buff and rochester get so much snow
They get so much snow because when the a cold, dry, air mass from central Canada crosses southeast across one of the great lakes, it picks up water vapor and heat from the lake. As soon as the air mass reaches the other side, the air rises and cools again. Then the water vapor condenses and falls as snow.
Try to find shelter from the wind if your are caught in one, cover exposed body parts to stay dry, if you are in a car, driver should keep engine running only if the exhaust pipe is clear of snow.
What are the main kinds of storms and how do they form?
The main types of storms are thunderstorms, tornadoes, hurricanes, and snow storms. Thunderstorms form in cumulonimbus clouds, which usually form on warm, humid afternoons. Tornadoes can form in any type of severe weather conditions. But they usually form in thunderstorms when the warm air in the US meets the air coming down from Canada, the cold air forces the warm air up creating a squall line. Squall lines produce tornadoes. Hurricanes begin over warm ocean water. They start as tropical disturbances, which can grow in size. Snow storms form when precipitation falls from clouds and the temperature is 0 degrees celsius or lower.
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