weather fronts. cp air mass moves south the front of the cp air mass is obvious by the drastic...
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Weather Fronts
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cP air mass moves south
The front of the cP air mass is obvious by the drastic difference in temperatures behind and in front of the air mass
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A drastic difference in temperatures indicates a front
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Locate the cold and warm front
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4 Types of Fronts
5
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Fronts• Boundary surfaces that separate air masses of
different DENSITIES.• one air mass is usually WARM and MOIST, the
other one COLD and DRY• vary in size: 15-200 km wide• defined by their temperatures• air masses move at different speeds and “clash”• the warmer, less dense air always forced aloft (up)• warm air overlies cold air and a slope is produced.• form mid-latitude cyclones• produce precipitation and severe weather.
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Fronts
Warm Front• Symbol• Speed• Slope• Clouds• Precipitation• Weather• Winds
Cold Front
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Warm Fronts• Warm air moves to occupy an area formerly
covered by cooler air.
• Warm air masses: mT • from Gulf of Mexico, or California,
Mexico coast
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Warm fronts
• Very gradual slope: 1:200km• Speed: advance slowly 15 mph – 20 mph• Clouds: cirrostratus, altostratus, nimbostratus• Precipitation: light to moderate, over a wide
area, long period of time.• Weather: temps. gradually rise, fog, freezing rain• Barometer: dropping below 30 in.• Winds: from east to SW
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Warm Front
Unstable air mass
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Warm Front Precipitation
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Cold Front
• cP continental polar air (Canada) actively advances into an area formerly occupied by warm air.
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Cold Fronts
• Slope: Twice as steep: 1:100 km• Advance FAST: 20 mph-50 mph• Clouds: altocumulus, then towering cumulonimbus• Precipitation: heavy downpours, wind gusts over
short duration• Weather: violent weather, temperature drops, clear,
fair weather after• Barometer: rising (above 30 in.)• Winds: shift from SW to NW
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Cold Front
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Thunderstorm Development along a Cold Front
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Stationary Fronts
• Air flow is neither toward a cold air mass or a warm air mass
• Air flow is parallel to the front line• The front does not move, or very slowly (after
remaining over an area for several days)• Precipitation is moderate, flooding possible.
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Occluded Fronts
Cold-Type• Rapidly moving cold front, overtakes a warm front
• Cold air WEDGES the warm air upward
Warm-Type• Warmer air behind a cold
front “catches-up”• Ex; north Pacific Coast –
warm mP invades the frigid cP air
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Occluded Fronts
• Slope: Twice as steep: 1:100 km• Advance fast: 20 mph-50 mph• Clouds: altocumulus, then towering cumulonimbus• Precipitation: heavy downpours, wind gusts over
short duration• Weather: violent weather, temperature drops, clear,
fair weather after• Barometer: rising• Winds: shift from SW to NW
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Occluded Front
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21
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Front’s Bell work
1. Moves in the fastest _________
2. Steady, light precipitation ___________
3. Precedes cool, clear weather _________
4. Has a slope of 1:200 km __________
5. Does not advance forward or back for days ________
6. Produces stratus clouds _________