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Weather Fronts

Weather Fronts. Front : the boundary that separates two different air masses. There are four types of fronts. Warm Fronts Cold Fronts Stationary Fronts Occluded Fronts. Warm Fronts. Forms when warm air moves into an area formerly covered by cooler air

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Weather Fronts

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  1. Weather Fronts • Front: the boundary that separates two different air masses. • There are four types of fronts. • Warm Fronts • Cold Fronts • Stationary Fronts • Occluded Fronts

  2. Warm Fronts • Forms when warm air moves into an area formerly covered by cooler air • Warm air gradually rises over the cold air  light showers that come before the warm air

  3. Warm Fronts • Produce light-to-moderate precipitation • Winds will shift from the east to the southwest • Shown as a red line with semicircles that point towards the cooler air

  4. Cold Fronts • Forms when cold, dense air moves into a region occupied by warmer air • Cold air moves quickly into the area of warmer weather  pushing the warmer air above the cold air.

  5. Cold Fronts Force of lifting the warmer air above the cold air can produce thunderstorms • After the storms the weather is cold • Shown as a blue line with triangles that points towards the warmer air.

  6. Stationary Fronts • Stationary Front – a cold front and a warm front move parallel and in the same direction together • Neither the cold air mass or the warm air mass move towards each other.

  7. Stationary Fronts • Gentle to moderate precipitation can fall along the stationary front. • Shown by blue triangles on one side of the line and red semicircles on the other side of the line.

  8. Occluded Fronts • An active cold front takes over a warm front an occluded front forms • The cold front moves in where there is a warm front with a nonmoving cool front on the other side

  9. Occluded Fronts • The cold front and cool front squeeze the warm front upward, causing heavy, then light rain. • The occluded front will twist and turn around the warm front.

  10. Middle-Latitude Cyclones • Middle-latitude cyclones are extremely low pressure systems  heavy storms. • The warm front is pushed upward as the cold front moves in  occluded front • Occluded front grows  precipitation increases, pressure drops, and wind increases • Storms take one or two days to completely displaced the warm air. • Air higher up in the atmosphere fuels the energy for the middle-latitude cyclones • Hot air spreads out aloft and pulls more air upward from below  middle-latitude cyclone

  11. Assignment • Atmosphere Study Guide

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