Chapter 8 cover. air masses An air mass is a large body of air that has similar temperature and...
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Transcript of Chapter 8 cover. air masses An air mass is a large body of air that has similar temperature and...
Chapter 8 cover
air masses
An air mass is a large body of air that has similar An air mass is a large body of air that has similar temperature and moisture properties throughout. temperature and moisture properties throughout.
The best source regions for air masses are large The best source regions for air masses are large flat areas where air can be stagnant long enough flat areas where air can be stagnant long enough to take on the characteristics of the surface below.to take on the characteristics of the surface below.
Figure 8.1
temperaturetemperatureP-PolarP-Polar
A-ArcticA-Arctic
T-TropicalT-Tropical
humidityhumidity
m-Maritime-wetm-Maritime-wet
c-Continental-dryc-Continental-dry
classifying air massesclassifying air masses
air masses
Continental Polar Air MassesContinental Polar Air Masses
cold temperatures and little moisturecold temperatures and little moisture
a map of surface observations and the leading edge of a large arctic air mass blanketing much of the United States has been highlighted by the blue line.
The center of this air mass is a high pressure center located in northern Montana (indicated by the blue "H")
Continental Polar AirContinental Polar Air
Maritime Tropical Air MassesMaritime Tropical Air Masses
warm temperatures and rich in moisturewarm temperatures and rich in moisture
Maritime Tropical AirMaritime Tropical Air
a map of surface observations and the leading edge of a tropical air mass surging northward into the Ohio Valley has been highlighted in red.
Southerly winds behind the boundary signify the continued northward transport of warm moist air
k-coldk-coldw-warmw-warm
air mass modificationair mass modification
cP-wcP-w
fronts
cold front
Figure 8.2
Figure 8.3
fronts
warm front
Figure 8.4
fronts
fronts
occluded fronts
mid-latitude cyclone
formation of an occlusion
mature cyclone
partial occlusion
occlusion
life of a midlatitiude
cyclone
Figure 8.8
Figure 8.9
Figure 8A
Figure 8.10
Figure 8.7