-Unlicensed-Atmospheric Disturbance NXPowerLite NXPowerLite

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AtmosphericDisturbances


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Thunderstorm


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Thunderstorm

Thunderstorms need three things:

Moistureto form clouds and rain.

Unstable Airrelatively warm air that can riserapidly.

Liftfronts, sea breezes and mountains arecapable of lifting air to help form

thunderstorms.


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Thunderstorm

Generating Seasons

1. Spring2. Summer

Occur during the afternoon and Evening


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Tornadoes


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Tornadoes

Natures most violent storms

Develop in all over the world but most

frequently in United States.

Generating seasons

1. Spring

2. Summer In an average 800 tornadoes reported every

year world wide.


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What causes tornadoes?

Tornadoes in the winter and early spring areoften associated with strong, frontal systems.

That form in the Central States and move east.

Occasionally, large outbreaks of tornadoesoccur with the following type of weatherpattern.

Warm, moist air advancing over the advancingcold front


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Facts of Tornadoes

The central vortex of a tornado is typically about328.1 ft (100 m) in diameter.

Wind speeds in the vortex have been measuredat greater than 220 mph (138 km/h).

These high winds make incredible feats ofdestruction possible.

They also cause the air pressure in the tornadoto drop below normal atmospheric pressure byover 100 millibars (the normal day-to-daypressure variations we experience are about 15millibars).


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Facts of Tornadoes

The air around the vortex is pulled into this lowpressure zone where it expands and cools rapidly.

This causes water droplets to condense from the air,making the outlines of the vortex visible as the

characteristic funnel shaped cloud. The low pressure inside the vortex picks up debris such

as soil particles, which may give the tornado anominous dark color.

A tornado can act as a giant vacuum cleaner sweepingover anything unlucky enough to be in its path.

The damage path of a tornado may range from 900 ft(300 m) to over 0.5 mi (1 km) wide.


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Facts of Tornadoes

Tornadoes move with the thunderstorm that theyare attached to, traveling at average speeds ofabout 10-30 mph (15-45 kph)

although some tornadoes have been seen tostand still, while other tornadoes have beenclocked at 60 mph (90 kph).

Since a typical tornado has a lifetime of about fiveto 10 minutes, it may stay on the ground for 5-10

mi (8-16km). Occasionally, a severe tornado may cut a path of

destruction over 200 mi (320 km) long.


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Facts of Tornadoes

Witnesses to an approaching tornado often

describe a loud roaring noise made by the

storm similar to jet engines at takeoff.

There is no generally accepted explanation for

this phenomenon although it has been

suggested that supersonic winds inside the

vortex cause it.


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Hurricane


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Hurricane: engine of destruction

Hurricanes are giant, spiraling tropical storms that canpack wind speeds of over 160 miles (257 kilometers) anhour and unleash more than 2.4 trillion gallons (9trillion liters) of rain a day.

These same tropical storms are known as cyclones inthe northern Indian Ocean and Bay of Bengal, and astyphoons in the western Pacific Ocean.

The Atlantic Oceans hurricane season peaks from mid-August to late October and averages five to six

hurricanes per year.
http://environment.nationalgeographic.com/environment/natural-disasters/hurricane-profile/


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Hurricanes begin as tropical disturbances inwarm ocean waters with surface temperaturesof at least 80 degrees Fahrenheit (26.5

degrees Celsius). These low pressure systems are fed by energy

from the warm seas.

If a storm achieves wind speeds of 38 miles(61 kilometers) an hour, it becomes known asa tropical depression.



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A tropical depression becomes a tropical

storm, and is given a name, when its sustained

wind speeds top 39 miles (63 kilometers) an

hour.

When a storms sustained wind speeds reach

74 miles (119 kilometers) an hour it becomes

a hurricane and earns a category rating of 1 to5 on the Saffir-Simpson scale.



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Hurricanes are enormous heat engines thatgenerate energy on a staggering scale. They drawheat from warm, moist ocean air and release itthrough condensation of water vapor in

thunderstorms. Hurricanes spin around a low-pressure center

known as the eye. Sinking air makes this 20- to30-mile-wide (32- to 48-kilometer-wide) area

notoriously calm. But the eye is surrounded by acircular eye wall that hosts the stormsstrongest winds and rain.


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These storms bring destruction ashore in

many different ways. When a hurricane makes

landfall it often produces a devastating storm

surge that can reach 20 feet (6 meters) highand extend nearly 100 miles (161 kilometers).

Ninety percent of all hurricane deaths result

from storm surges.


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A hurricanes high winds are also destructive and

may spawn tornadoes. Torrential rains causefurther damage by spawning floods and

landslides, which may occur many miles inland. The best defense against a hurricane is an

accurate forecast that gives people time to getout of its way. The National Hurricane Center

issues hurricane watches for storms that mayendanger communities, and hurricane warningsfor storms that will make landfall within 24 hours.


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