Download Fire in the sky

Does Weather Control Your Life???
Weather!
Weather
• Weather- condition of the atmosphere at a
certain time and place.
– Weather Characteristics:
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Heat energy
Air pressure
Winds
Moisture
Weather Data Collection
3 Ways Weather is Determined
• Weather Satellites- take pictures of clouds and storms
from above the earth
• Radar (Radio Detecting and Ranging)- sends out signals
that are reflected from objects (rain, clouds, etc.)
• Weather Stations-More than 400 in the U.S.
Air Masses
• Air Mass- a large body of air with a
certain temperature and moisture
– Maritime tropical-forms over the tropical
ocean & warm and moist
– Maritime polar-forms over northern
ocean & cold and moist
– Continental tropical- made of hot, dry air
– Continental polar- made of cold, dry air
Weather Fronts
• Front- leading edge of air mass
• Cold Front- bring violent storms followed by cool weather
• Warm Front -bring rain and showers with warm humid air
Occluded Frontmake light rain
•Stationary Front- bring many days
of rain
Air Pressure
• Air Pressure=Barometric
• Barometric Pressure-measure of weight
of air pressing on earth’s surface.
General Characteristics:
Falling Pressure- stormy weather
Rising Pressure-fair weather coming
Steady Pressure-continue weather
Wind
• Wind-Moving air
– Made from differences in
air pressure
– The greater difference in air
pressure the faster the wind
• Weather Vane- changes
points to show the
direction of the wind
• Anemometer- measures
wind speed
Humidity
• Humidity- the moisture in the air
• Relative Humidity- a comparison of the amount of water
vapor in the air to the greatest amount at that temperature.
– Given as a % that is possible
• Saturated- when the air is as full as possible with water
• Psychrometer- compares the temperature of a wet and dry
bulb of a thermometer
– Typically the dry bulb is hotter temp
Dew
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Dew- water vapor that has condensed on a surface into
water
– Occurs when the temperature next to the surface falls and the air
next to the ground is full of water….therefore, the water
condenses instead of evaporates.
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Dew point- the temperature needed for the air to
condense
Dew depends on 2 factors..
1. Air temperature near the surface
2. Amount of water in the air
Tornado
• Tornado- a violent rotating column of
air
– Develop from a Thunderstorm
• Water Spout-weak tornado over the
water
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Before thunderstorms
develop, a change in
wind direction and an
increase in wind speed
with increasing height
creates an invisible,
horizontal spinning
effect in the lower
atmosphere.
Rising air within
the thunderstorm
updraft tilts the
rotating air from
horizontal to
vertical.
An area of rotation, 26 miles wide, now
extends through
much of the storm.
Most strong and
violent tornadoes
form within this area
of strong rotation
Hurricane
Hurricane
• Few Interesting Facts:
– All hurricanes circle around an “eye” (The center of
the storm)
– The center of the storm is the calmest part
– They can be up to 600 miles across
– The winds travel from 75-200 mph
Weather
• Interactive Current Weather Map
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