How do fronts & air masses change the

How do fronts & air masses change the

• 1.
  How do fronts& air masses change the weather?
• 2.
  Air masses  It’sa large body of air which have the same temperature & same  amount of water vapor.
• 3.
   Air massescan be formed over: 1) Land Dry air mass 2) Water of moisture” Wet air mass “with lots
• 4.
  Types of airmasses 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 isthe border between one mass & another.
• 6.
  Types of fronts Coldfront: - 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.
• 9.
  Warm front: - It isformed 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.
• 13.
  Difference between cold& warm fronts
• 14.
  Stationary front: - - It isformed 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.
• 17.
  Weather map  Ithelps us to know what the weather is like in an area. {Made from information collected from weather stations}
• 18.
  Symbols on aweather map     Sunny  Sunny & cloudy  Rainy
• 19.
  Colored areas ona weather map  Red Very hot weather  Orange Warm weather  Yellow Mild weather  Green Cool  Blue Very cold
• 20.
  Weather Forecast  Isto predict the weather conditions.
• 21.
  Can you readthis weather map?
• 22.
  Severe storms (1) Tornadoes: -It’sa 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.
• 23.
  (2) Blizzards: - Theyare severe snow storms that can last for hours. - Blizzards have strong winds, blowing snow & very low air temperature “Cold”
• 24.
  (3) Hurricanes: - Theyare 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.
• 25.
  Weather Safety • There arecertain weather safety rules that we should follow in order to be safe from severe weather conditions.
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  Examples  Watching TVduring severe “bad” weather to get directions about what to do.
• 27.
   Weather sirensare turned on when severe storm is detected.
• 28.
   Flags areused to warm people from a coming hurricane.
• 29.
   Evacuation signsare used to tell people to evacuate “empty” an area when a hurricane is coming.