1 Aim: What makes winds blow? Do now: 1. Warm moist weather is a result of a (high/low) pressure system coming into an area. 2. High pressure systems bring (clear/cloudy) skies. 3. Air moves from ______________ to ___________. 4. Differences in pressure bring _______________. 5. Pressure systems move this direction across the US.________
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1
Aim: What makes winds blow?
Do now: 1. Warm moist weather is a result of a (high/low) pressure system coming into an area.2. High pressure systems bring (clear/cloudy) skies.3. Air moves from ______________ to ___________.4. Differences in pressure bring _______________.5. Pressure systems move this direction across the US.________
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Here is a map of barometric pressure.We are going to create isobars with an interval of 4 mb.
Let's start with 994 mb
Aim: What makes winds blow?
4
994mb
998m
b
1002mb
1006mbWhich area is
the High?
Which area is the Low?
Which direction is the wind coming from?
Aim: What makes winds blow?
5
Wind Horizontal movement of air. Wind moves from high to low pressure.
What does this have to do with taking a shower?
What is happening in this picture?
When low pressure meets high pressure we get wind.
HLIn which direction does wind move?
Aim: What makes winds blow?
6
Where will the faster winds be?
Where will the slower winds be?
Aim: What makes winds blow?
Pressure Gradient
Isobars close together means faster winds
Isobars far apart means slower winds
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Name the fastest winds
Name the slowest winds
Aim: What makes winds blow?
N
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Aim: What makes winds blow?
What is the wind like when you are at the beach?
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Aim: What makes winds blow?
High Specific Heat• Long time to heat up• Long time to cool down.
Low Specific Heat• Quickly heats up• Quickly cools down
What takes longer to heat up? Metal or Water?
How does this relate to the beach?
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• Air above the land heats more and expands and rises.
• If the air over land heats faster will it have a higher or lower pressure than over water?
• Pressure moves from High Low
Daytime = SeabreezeAim: What makes winds blow?
11
Nighttime = Land Breeze
Nighttime:• Reverse• Land cools more rapidly than water• Warmer air over the water• Land breeze
Aim: What makes winds blow?
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