Weather again.notebook
April 20, 2015
Apr 17­4:03 PM
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Weather again.notebook
April 20, 2015
The same
Source Region
The characteristics change!
boundary between 2 different air masses
Change in temperature
Change in precipitation
Change in wind direction
Apr 20­7:48 AM
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Weather again.notebook
April 20, 2015
Air masses: large body of air that has the same temperature and moisture conditions.
Types of air masses:
1) Maritime Polar
­cool, moist
2) Continental Polar
­cool, dry
3) Maritime Tropical ­warm, moist
4) Continental Tropical
­warm, dry
Origination:
­if over land = dry
­if over water = moist
­if near equator = warm
­if close to poles (N,S) = cold
Apr 21 ­ 7:23 AM
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Weather again.notebook
April 20, 2015
Apr 20­7:49 AM
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Weather again.notebook
April 20, 2015
• Air masses move from WEST TO EAST­­pushed by global winds
• As air masses move they change the local weather conditions
­the weather may become wetter or drier, warmer or cooler depending on the TYPE of air mass passing.
Apr 24­8:46 AM
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Weather again.notebook
April 20, 2015
Systems in the Northern Hemisphere:
High pressure Systems: wind spirals outward from
the center in a clockwise direction Bring clear skies!
Low Pressure Systems: wind spirals inward in a counter­clockwise direction Bring cloudy, wet weather!
Apr 21 ­ 8:32 AM
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Weather again.notebook
April 20, 2015
Systems in the Northern Hemisphere:
High pressure Systems: wind spirals_______________ from the center in a clockwise direction Bring ______________ skies!
Low Pressure Systems: wind spirals____________ in a counter­clockwise direction Bring __________________ weather!
Apr 21 ­ 8:32 AM
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Weather again.notebook
April 20, 2015
Fronts = boundary between two different
High Cirrus, air masses
Stratus clouds
Warm front = when a warm air mass pushes into and over a cold air mass
Map Symbol:
Bring light precipitation and warm temp.
Cumulonimbus clouds
Cold front = when a cold air mass pushes into and under a warm air mass
Map Symbol:
Bring Stormy weather, cool temps.
Occluded Fronts
• Because cold fronts move faster than warm fronts, they can catch up to and overtake their related warm front. When they do, an occluded front is formed. Usually in the form of a mature storm.
Apr 21 ­ 2:13 PM
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Weather again.notebook
April 20, 2015
Fronts = _________________________________
______________________
High Cirrus, Stratus Warm front = when a ______ air mass pushes into and over a_______ air mass
clouds
Map Symbol:
Bring light precipitation and warm temp.
Cold front = when a_______ air mass pushes into and under a______ air mass
Cumulonimbus clouds
Map Symbol:
Bring Stormy weather, cool temps.
Apr 21 ­ 2:13 PM
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Weather again.notebook
April 20, 2015
Stationary Fronts
• Cool air mass and warm air mass meet, and do not move or barely move
Map Symbol: Occluded Front:
Cool air trapped and squeezed upward
between fast moving cold front and slow
moving warm front.
Brings STORMS!
Symbol: Apr 20­10:09 AM
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Weather again.notebook
April 20, 2015
Stationary Fronts
• Cool air mass and warm air mass meet, and ________________________
Map Symbol: Occluded Front:
Cool air trapped and squeezed upward
between fast moving cold front and slow
moving warm front.
Brings _________________!
Symbol: Apr 20­10:09 AM
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Weather again.notebook
April 20, 2015
Apr 24­10:37 AM
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Weather again.notebook
April 20, 2015
Name the FRONT!
Apr 24 ­ 5:27 PM
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Weather again.notebook
April 20, 2015
Weather forecasting: can only be short term (few days)
Based on:
­air pressure
­cloud types
­wind direction
*New technology allows for longer term forecasting
isolines
Apr 24 ­ 5:29 PM
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Weather again.notebook
April 20, 2015
Apr 24­10:45 AM
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Weather again.notebook
April 20, 2015
Weather symbols: used on weather maps to make predictions
Apr 21 ­ 8:38 AM
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