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Weather Forecasting

Weather Forecasting. Fronts. A boundary between 2 air masses of different density, moisture, or temperature Represented on weather maps by various types of curving lines Cloudiness, precipitation and storms sometimes occur at frontal boundaries. Types of fronts. Cold fronts Warm fronts

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Weather Forecasting

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  1. Weather Forecasting

  2. Fronts • A boundary between 2 air masses of different density, moisture, or temperature • Represented on weather maps by various types of curving lines • Cloudiness, precipitation and storms sometimes occur at frontal boundaries

  3. Types of fronts • Cold fronts • Warm fronts • Occluded fronts • Stationary fronts

  4. Cold fronts • Shown on a map as a blue line with triangles • Occurs when colder air advances toward warm air • Cold air wedges under warm air

  5. Warm fronts • Shown on a map as a red line with semicircles • Occurs when lighter, warmer air advances over heavier, colder air

  6. When cold and warm fronts meet • Warm air is lifted, it cools and water vapor condenses, forming clouds • When the temperature difference between the cold and warm air is large or the cold front moves in quickly: • Thunderstorms and even tornadoes may form

  7. warm & cold fronts

  8. Occluded fronts • Involves 3 air masses of different temperatures: • Colder air • Cool air • Warm air • May form when a cold air mass moves toward cool air with warm air between the two • The colder air forces the warm air upward, closing off the warm air from the surface • Shown on maps as purple lines with triangles and semicircles

  9. Occluded fronts

  10. Stationary fronts • Occurs when a boundary between air masses stops advancing • May remain in the same place for several days • Producing light wind and precipitation • Shown on maps as an alternating red and blue line • Red semicircles point toward the cold air • Blue triangles point toward the warm air

  11. Stationary fronts

  12. Why does weather change? • Air masses • Air pressure • Fronts

  13. Severe Weather

  14. Thunderstorms • Heavy rain falls, lightning flashes, thunder roars, and hail might fall • Occur in warm, moist air masses and along fronts • Occur when warm air is lifted rapidly as cooler air sinks

  15. Tornadoes • A violently rotating column of air in contact with the ground • Occur along fronts when cold fronts rapidly approach warm fronts

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