weather patterns lab 6-5 pages 241 - 252 weather patterns aim understand how the variables we have...
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Weather PatternsLab 6-5
Pages 241 - 252
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Weather Patterns
• AIM
• Understand how the variables we have learned about so far work together to create weather systems.
• OBJECTIVE
• Construct field maps and learn to identify patterns than can be used to predict weather.
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Vocab• Synoptic Weather Map: A map that represents
all the atmospheric variables in an area.
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• Isotherm: Lines on a map connecting points of equal temperature; generally run parallel with the equator as temperatures decrease with increasing distance from the equator.
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• Barometric Pressure: The weight of the air in the atmosphere– High Pressure; nice weather– Low Pressure; bad/rainy weather
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• Isobar: Lines on a map connecting points of equal barometric pressure.
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• Convergence: Wind blowing toward the center (cyclone)
• Divergence: Wind blowing away from the center (anticyclone)
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• Cyclone: Low pressure system with air moving inward toward the center.
• Anticyclone: High pressure system with air moving away and outward from the center.
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• Air Mass: A large body of air with similar pressure, temperature and moisture. Acquired from a source region.
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• Source Region: An area of Earth’s surface over which an air mass forms and acquires its characteristics.
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• Front: The boundary between two air masses of different characteristics.
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Calculating Gradient• Gradient is the rate of
change between two points and is calculated by dividing the difference between two points by the distance.
• For example: If Galveston, TX and Kansas City, KS are 700 miles apart and the temperature in Galveston is 60º and the temperature in Kansas City is 50º then . . .
• 60º - 50º = 10º (That’s your difference)
• Distance = 700 miles
• 10º/700 = .014º/Mile
• Gradient = .014º/Mile
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• Are you ready to draw your Synoptic Weather Map?
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Map A: Isotherms
• Connect points of equal value
• Use an interval of 10°F
• Stop your lines when they go off the coast.
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If more dots are needed, add some…
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Map B: Isobars• Write the following in an empty space on the map:
Millibars Station Model Code
1024.0 240
1020.0 200
1016.0 160
1012.0 120
1008.0 080
1004.0 040
1000.0 000
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• Draw isobars
• Use an interval of 4mb.
• Label the highest pressure with an
• Label the lowest pressure with an
Map B: Isobars- Continued
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Drawing isobars . . .
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Map C: Wind PatternsDraw arrows…
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Map C: Wind PatternsNow Draw Large Arrows…
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Map D:Precipitation Patterns
• Draw a line encompassing the entire area where rain is falling.
• Lightly shade it in with pencil.
• Label the Air Masses.
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Handy Dandy Earth Science Reference Tables, pg 13
• An Air Mass is a large region of air that has the same temperature and humidity.
• It gets its properties from hanging out in the same region for a while.
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For example:
• If the source region is the gulf of Mexico and the air comes to Long Island…
• It will feel warm and moist to us: maritime tropical (mT).
• If it comes from central Canada…
• It will feel cold and dry to us: continental polar (cP)
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What type of air mass?
Cool & moist: mP
mP
Cool & Dry:
cP
Warm & Moist:
mT
cT
mT
mP
mT
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Make the Synoptic Map
• Use Instruction #1 as a check list of things to put on the map.
• Add the fronts.