1 / 16

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:

loan
Télécharger la présentation

Air Mass, Fronts and Local WEATHER

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related