Term
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Definition
When unlike air masses meet they do not easily mix but make_____.
-transitional boundary miles wide
-lean with hight
-warm air always rises over cold air |
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Term
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Definition
map symbol- red half circle
Warm air is displacing cold air
-warm air gently rises up over cold air
-shallow slope 1:200
-stratiform clouds (possible cirrus clouds)
low intensity, long duration precipitation |
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Term
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Definition
map symbol- blue triangles
Cold air is displacing warm air
-Cold air forces warm air to rise violently and rapidly
characteristics
-steep slope 1:40
-Cumuliform clouds
-high intensity, short duration precipitation |
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Term
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Definition
Neither air mass displaces the other
-weather is unpredictable but can produce low intensity, long duration precpt. due to gently rising air |
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Term
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Definition
Sub Continental in size (1000 miles across)
-characteristic warm and cold front extends from low pressure center.
-Cold front moves faster than warm front and chases it
-Cold front overtakes warm front, lifts warm air out of contact with ground causing an occluded front |
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Term
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Definition
Four axis of movement
-air converges into the low pressur e center
-warm front rotates counter clockwise
-cold front rotates counter clockwise
-whole ETC moves from west to East with the belt of the westerlies |
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Term
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Definition
| As the cold front overtakes the warm front, the warm air is lifted out of contact with the ground causing an occluded front. |
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Term
| Occluded Front characteristics |
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Definition
Warm air is lifted out of contact with ground
-both cuniform and stratiform clouds develop
-Worst of both worlds-long duration, high intensity precp.
-Occulsion usually occurs over Eastern US and Canada
-Full occlusion is the death of the cyclone since there is no more rising air |
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Term
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Definition
Cyclogenisis- birth of the ETC when warm and cold airmasses meet and conditions in upper atmosphere causes ETC to start spinning and move out in belt of westerly winds
maturity- ETC has well developed warm and cold fronts
Partial Occlusion- cold front partially overtakes warm front from center out
-Full inclusion- cold front completely lifts warm air out of contact with the ground of depriving the cyclone of its energy and killing it |
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Term
| Extra- Tropical Anticyclones |
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Definition
ETAC is referred to a high because it is based on a high pressure center
-migratory high pressure cell typically larger than an ETC
-ETC and ETACs alternate as they move with the westerlies
-high pressure does not produce precipitation (remember adiabatic warming of sinking air) |
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Term
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Definition
| long term pattern over seasons of temperature and perceptation |
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Term
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Definition
| graphic indicator of temp. and percp. for a certain place over the course of the year. |
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