How do fronts & air masses change the
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  • 1. How do fronts & air masses change the weather?
  • 2. Air masses  It’s a large body of air which have the same temperature & same  amount of water vapor.
  • 3.  Air masses can be formed over: 1) Land Dry air mass 2) Water of moisture” Wet air mass “with lots
  • 4. Types of air masses Cold & dry Cold & wet Causes cool weather with no or little precipitation Causes cool weather with snow. Warm & dry Warm & wet Causes warm weather with little or no precipitation Causes precipitation
  • 5. Fronts  It is the border between one mass & another.
  • 6. Types of fronts Cold front: - It is formed when a cold air mass pushes under a warm air mass. The cold air mass forces the warm air mass up quickly. Thick clouds forms as the warm air rises & cools & rain falls. Cold fronts often bring stormy weather.
  • 7. Warm front: - It is formed when a warm air mass pushes a cold air mass. The warm air mass slides up over the cold air. It forms layers of clouds. Warm fronts often bring steady rain , followed by clear warm weather.
  • 8. Difference between cold & warm fronts
  • 9. Stationary front: - - It is formed when fronts don’t move for many days. It causes storms & rain “Flooding” for many days. No change in the weather is followed by stationary front.
  • 10. Weather map  It helps us to know what the weather is like in an area. {Made from information collected from weather stations}
  • 11. Symbols on a weather map     Sunny  Sunny & cloudy  Rainy
  • 12. Colored areas on a weather map  Red Very hot weather  Orange Warm weather  Yellow Mild weather  Green Cool  Blue Very cold
  • 13. Weather Forecast  Is to predict the weather conditions.
  • 14. Can you read this weather map?
  • 15. Severe storms (1) Tornadoes: -It’s a fast spinning spiral strong wind that stretches From the cloud of the thunderstorm to the ground. -Tornadoes can have wind speeds greater than 400 km per hour. -USA has more tornadoes in a year than any other Place.
  • 16. (2) Blizzards: - They are severe snow storms that can last for hours. - Blizzards have strong winds, blowing snow & very low air temperature “Cold”
  • 17. (3) Hurricanes: - They are formed over warm water of oceans, it has a speed of 119 km per hour. - Hurricanes can last for weeks at the sea. - The wind of the hurricane spins around the calm center of the storm called: “Eye” - Hurricanes can cause flooding.
  • 18. Weather Safety • There are certain weather safety rules that we should follow in order to be safe from severe weather conditions.
  • 19. Examples  Watching TV during severe “bad” weather to get directions about what to do.
  • 20.  Weather sirens are turned on when severe storm is detected.
  • 21.  Flags are used to warm people from a coming hurricane.
  • 22.  Evacuation signs are used to tell people to evacuate “empty” an area when a hurricane is coming.