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Air Mass, Fronts and Local WEATHER

Air Mass, Fronts and Local WEATHER. AIR MASSES Large body of air with similar temperature and moisture characteristics is an AIR MASS . Air masses eventually move with prevailing winds and collide forming weather patterns. Classification:

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Air Mass, Fronts and Local WEATHER

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  1. Air Mass, Fronts and Local WEATHER

  2. AIR MASSES • Large body of air with similar temperature and moisture characteristics is an AIR MASS. • Air masses eventually move with prevailing winds and collide forming weather patterns. • Classification: • Continentalormaritime – formed over land or water • Polaror tropical – cold or warm • Weather forecasting is determining air mass characteristics and their movement.

  3. FRONTS: • Edge where two different air masses collide. • Frontal boundary can be 1-100 km wide. • Front is both horizontal (across) and vertical (up). • 1. Stationary Front • Two air masses next to each other but little/no movement. • Weather is usually very stable - nothing severe.

  4. 2. Cold Fronts • Warm, moistair mass, replacedbycolder, drier air mass. • Warm air is lifted up and over approaching cold air. • At the cold front: • Occurs quickly • sharp temperature change, moisture change, wind shift • Produces high altitude, anvil shaped cumulonimbusclouds. • can get intense showers/thunderstorms

  5. 3. Warm Fronts • Colder, drier air mass, replacedby warm, moistair mass. • At the warm front: • Occur gradually • Lots of various cloud types. • A much longer slope than for cold fronts. • Wide-spread precipitation for long periods.

  6. Occluded Fronts

  7. 4. Occluded Fronts (Occlusion) • A newfast moving cold front catches up to a slow moving warm front. • Warm occlusion: • Cold air in the fast front is WARMER than the cold air in the first front. • Newcooler air runs up thecolder air pushing the warm air in front and up. • A variety of precipitation and cloud types formed. • Long periods of heavy rains and strong wind changes.

  8. Warm occlusion

  9. Warm occlusion

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