1. Does Weather Control Your Life???

2. Weather
Weather- condition of the atmosphere at a certain time and place.
Weather Characteristics:
Heat energy
Air pressure
Winds
Moisture

3. 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.

4. 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

5. 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 Front- make light rain
Stationary Front- bring many days of rain

6. 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

7. 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

8. Humidity Humidity- the moisture in the air
Relative Humidity- a comparison of the amount of water vapor in the air to the greatest amount it could hold at that temperature.
Given as a % that is possible
Saturated- when the air is as full as possible with water

9. Dew Dew- water vapor that has condensed on a surface into water
Dew point- the temperature needed for the air to condense
Dew depends on 2 factors..
Air temperature near the surface
Amount of water in the air

10. Tornado Tornado- a violent rotating column of air
Develop from a Thunderstorm
Water Spout-weak tornado over the water

11. 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, 2-6 miles wide, now extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation

12. Hurricane

13. 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 mph

14. Weather
Interactive Current Weather Map

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