Precipitation, Air Masses, and Fronts

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Air Masses and Weather Fronts

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Precipitation, Air Masses, and Fronts Current Weather Finish Precipitation Air Masses Fronts For Next Class: Read Chapter 7 (pp. 215-227) Reminder: Exam I next Friday! Review sheet is posted

Moisture Droplets Figure 7.20

Raindrop and Snowflake Formation Figure 7.21

Saturation Vapor Pressure Figure 7.12

Favorable conditions for freezing rain Temperature conditions required for formation of frozen, freezing, and liquid forms of precipitation © AMS

Cloud Types and Identification Figure 7.22

Atmospheric Lifting Mechanisms Figure 8.6

Orographic Precipitation Figure 8.9

Orographic Patterns Figure 8.10

Average Annual Precipitation

What is Rime Ice? 13

Rime Ice A coating of tiny, white, ice particles caused by the rapid freezing of supercooled water droplets on impact with an object.

Rime Ice on Mt. Mitchell 15

Rime Ice on Beech Mountain

Heavy Rime Icing on Mt. Washington 17

18

Rime Icing on Grandfather Mountain

Snow Particle Photomicroscopy Graupel

Snow Particle Photomicroscopy

Air Masses What are the major air mass types and source regions?

Air Masses Classified as Four basic types Cold (polar, abbreviated as P) or warm (tropical or T) Dry (continental or c) or humid (maritime or m) Four basic types Cold and dry, continental polar (cP) Cold and humid, maritime polar (mP) Warm and dry, continental tropical (cT) Warm and humid, maritime tropical (mT) Fifth type, arctic (A) air, is dry like continental polar air but colder © AMS

© AMS

Air Masses Also differ in stability © AMS

Fronts Narrow zone of transition between air masses that differ in density Density differences usually due to temperature contrasts Warm and cold fronts Frontogenesis: fronts form or grow stronger Frontolysis: fronts weaken © AMS