air masses and fronts meteorology. air masses classified by temperature and humidity –tropical:...

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Air Masses and Fronts Meteorology

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Page 1: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Air Masses and FrontsMeteorology

Page 2: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Air Masses

• Classified by temperature and humidity

– Tropical: Warm, form in tropics, low pressure

– Polar: cold, form near poles, high pressure

– Maritime: form over oceans, humid– Continental: form over land, dry

Page 3: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Page 4: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Fronts

• Colliding air masses

Page 5: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Cold fronts

• Cold air “undercuts” warm air. Front moves quickly. If the warmer air mass contains enough moisture, possible storms, clouds, rain (vertically developing clouds) followed by clear, cool weather.

Page 6: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Page 7: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Warm fronts

• Warm air “over-rides” cool air. Front moves slowly. If the warmer air mass contains enough moisture, clouds (stratus) and rain may occur for several days followed by warmer, more humid weather.

Page 8: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Page 9: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Stationary Fronts

• Neither air mass has enough force to move the other. Weather depends on moisture content of air masses.

Page 10: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Occluded Fronts

• Most complex front. Involves three air masses: cool, cold, warm.

Page 11: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Page 12: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Page 13: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

Page 14: Air Masses and Fronts Meteorology. Air Masses Classified by temperature and humidity –Tropical: Warm, form in tropics, low pressure –Polar: cold, form

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