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25.2 Fronts

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by

Katelynn Dorn

on 10 March 2015

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Transcript of 25.2 Fronts

Ch. 25: Weather
25.2 Fronts
front
- boundary forms between air masses
cold front
- cold air mass overtakes warm one
squall line
- long line of heavy thunderstorms ahead of fast-moving cold front
warm front
- warm air mass overtakes cooler one, preceded by lots of clouds
stationary front
- when two air masses meet but neither is displaced
occluded front
- fast-moving cold front contacts lifted warm front and moves with it
polar front- boundary where cold polar air meets warmer air of middle latitudes (40-60 degrees)
wave cyclones- large storms with winds spiraling in a circular path around a low-pressure center
Polar Fronts and Wave Cyclones
severe tropical storm with wind speeds > 120 km/hr
warm moist air rises rapidly and condenses, releases large amounts of energy and heat
cumulonimbus bands spiral around the center
NW Pacific --> typhoons
eye- calm center of sinking air
Hurricanes
shortest severe storm, whirling, funnel-shaped cyclone
when a T-storm meets high-altitude horizontal winds
Tornadoes
Types of Fronts
Stages of a Wave Cyclone

1. stationary front forms
2. wave develops as cold air pushes into warm air and vice versa, clouds and precipitation form
3. low pressure area forms in middle and warm air is lifted (occluded)
4. wave cyclone dissipates- back to normal
Anticyclones
air sinks and flows outward from a center of high pressure
bring dry weather, sinking air does not promote cloud formation
droughts
Thunderstorms
warm, moist mT air is heated and rises, or air rising over mountains
3 stages
cumulus stage- warm moist air rises, condenses, forms cumulus cloud
mature stage- dark cumuonimbus
dissipating stage
thunder and lightning
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