objective: s.w.b.a.t. - mr goodyear environmental (earth ... · objective: s.w.b.a.t. •explain...
TRANSCRIPT
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Objective: s.w.b.a.t. • Explain the steps in formation of a thunderstorm • Define: lighting and thunder & explain how the two
are connected and created. • Understand how to protect themselves from
lightning and what to avoid during thunderstorms • Observe a video connect to static electricity and
lightning • Complete by reading a worksheet with question
about lightning.
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Activities • Warm-up
• Notes/discussion
• Video - question/discussion
• Worksheet Lightning 1-4
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Weather 21-2 cont.
Severe Weather
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Severe Weather Severe Weather – violent circulation (storms) A thunderstorm is usually a brief, heavy storm that consists of rain, strong winds, lightning, and thunder. - - Produced cumulonimbus clouds - - usually occur along cold fronts - - strong updrafts and down drafts - - occur in 3 stages
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Severe Weather Stage 1- Strong updrafts from rapidly rising warm air
In the cumulus stage, warm, moist air rises, and the water vapor within the air condenses to form a cumulus cloud.
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Severe Weather Stage 2 – heavy rain begins creating up and downdrafts.
In the mature stage, the cloud rises and becomes a dark, cumulonimbus cloud from which heavy, torrential rain and hailstones may fall.
Particles moving and sliding past each other lose electrons building up static charges – generating - lightning
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Severe Weather Stage 3 – light rains and calm down drafts only
During the dissipating stage, the strong downdrafts stop air currents from rising. The thunderstorm dissipates as the supply of water vapor decreases.
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Severe Weather During a thunderstorm, clouds discharge electricity in the form of lightning.
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Severe Weather Lightning is a large electric spark caused by the static electricity of particles moving in a storm
- Lightning is a form of plasma – charged particles
- When the area in a cloud becomes overcharged lightning occurs
- As the thunderstorm cloud develops it has +(positive charge at top) & -(negative charge) at bottom
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Severe Weather - Ground (Earth’s surface has a positive charge)
Electricity flows from negative to positive charge
-Lightning is occurs when these areas become overcharged – and the unlike charges attract each other.
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Severe Weather The released of lightning electricity heats the air, which rapidly expands and produces a loud noise known as thunder.
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Severe Weather Lightning heats the air to 30,000
C or hotter which causes the air to expand violently causing a shock wave of thunder
- Timing between lightning flash and thunder – one can calculate distance to lightning
- For every second = 1000 feet, 5 seconds = 1 mile
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Objectives: S.W.B.A.T. • Define Hurricane and its parts
• Explain where hurricanes form an why and what causes most damage and deaths related to hurricanes
• Define tornado and how most damage and deaths are caused by them
• Plot tornado alley and answer questions related to this area and tornado development
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Activities: • Warm-ups & quiz
• Collect any outstanding work
• Complete video from prior day
• Notes/discussion
• Tornado alley – plot & questions
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Severe Weather Hurricanes – are powerful cyclones (low pressure storms) that form over tropical air near the equator.
Other names for hurricanes: Typhoons – in North Pacific
Willy-Willies – in Australia
Tropical cyclones in other areas
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Severe Weather A hurricane is a severe storm that develops over
tropical oceans. Its strong winds spiral in toward the intensely low-pressure storm center.
To be a
hurricane, a storm’s winds must be 75 miles per hour or greater.
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Severe Weather A fully developed hurricane has of a series of thick cumulonimbus low pressure cloud bands that spirals counterclockwise upward around the center of the storm.
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Severe Weather Hurricanes start out as tropical depressions winds at 38 mph
Then they become tropical storms winds 39-73 mph
Then hurricane when winds reach 74 mph
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Severe Weather Eye of a hurricane is a calm many times cloudless low pressure center – it is surrounded by the most powerful winds and storm region.
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Severe Weather • Winds range from 75 to 155+
• Diameter can be 300-400 miles
• Hurricane Season: June 1 – November 30
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Severe Weather
The most dangerous aspect of a hurricane is a rising sea level and large waves, called a storm surge. (large dome or tide of seawater) covers 50-100 miles, 10-20 ft. above normal high tide
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Severe Weather Tornadoes are the smallest, most violent, and shortest-lived severe storm. Tornadoes that forms over water are called a waterspout
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Severe Weather • Tornadoes – is a small destructive storm having a rapidly spinning
funnel shape cloud (also a low pressure area)
• Caused by warm air being trapped below cold air and the warm air rises rapidly
• Tornado watch means: conditions are favorable
• Tornado Warning means: one has been sighted in local area
• Time of April to June are best conditions for tornadoes
• The zones/region is USA where hurricanes form is know as tornado alley
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Severe Weather A tornado forms when a thunderstorm meets high-altitude horizontal winds. These winds cause the rising air in the thunderstorm to rotate.
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Severe Weather If the funnel does touch the ground, it generally moves in a wandering, haphazard path.
Last week of April, 2011
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Severe Weather The destructive power of a tornado is mainly due to the speed of the winds, which may reach speeds of more than 250+ mph.