Air Masses and Fronts The battle begins Ch. 9: Air Masses and Fronts • Air Masses Sources and Classification Distribution • Fronts Cold Front Warm Front Occluded Fronts Air Masses • Definition: a volume of air with a particular temperature and/or humidity characteristics • Source Region: where air masses originate • Classification: warm or cold, moist or dry 1 2 3
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Air Masses and Fronts - class.atmos.ucla.educlass.atmos.ucla.edu/AS3/scrns/pdf_files/09fronts.aos3.notes.pdf · Occluded Fronts Air Masses •Definition: a volume of air with a particular
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Air Masses and Fronts
The battle begins
Ch. 9: Air Masses and Fronts
• Air Masses
Sources and Classification
Distribution
• Fronts
Cold Front
Warm Front
Occluded Fronts
Air Masses
• Definition: a volume of air with a particular temperature and/or humidity characteristics
• Source Region: where air masses originate
• Classification: warm or cold, moist or dry
1
2
3
Air Masses
xX
Humidity Temperature
c Continental
m Maritime
P Polar
T Tropical
North American Air Masses
North American Air Masses
4
5
6
Fronts
— Boundary between air masses
60°N
Polar Easterlies
Prevailing Westerlies
cP
mT
Sub-polar Front
Fronts
• Fronts are named by the “winning” airmass
Ex. Cold front: cold air pushes warm air up and out of its way
• Line is boundary between airmasses at the ground
Symbols point in the direction of the frontal movement