Day 43

Investigation 8 part 4Pressure Maps

Pressure Map of the USWeather maps are used by meteorologist

Information is gathered from weather balloons, satellites, and other weather sources

Air Pressure is very IMPORTANT

Pressure Maps and Isobars#’s represent atmosphere pressure in millibars

Low Pressure

High Pressure

Lines are isobars

Iso - samebar - pressure

Connect all recording stations where the atmosphere pressure is the same

Low and High Pressure Readings

Lowest Pressure984 mb

Highest Pressure1032 mb

Which way does the wind blow?

From Billings to Kansas City? From Kansas City to Billings?

The wind blows from Kansas City to Billings

Which way does the wind blow?

From Buffalo to Kansas City?

From Kansas City to Buffalo?

The wind blows from Kansas City to Buffalo

Isobar Intervals

What is the difference between isobar lines?

1032 mb - 1028 mb = 4 mb

Why is pressure difference between adjacent lines always the same but the distance is not?

Shows how fast the pressure is changing

Isobar Intervals

What do you think it means when the isobars lines are far apart?

Gradual change in pressure

What do you think it means when the isobar lines are close together

Rapid change in pressure

Isobar Intervals

Wind speed will be highest between two locations where isobars are close together

What can the distance between isobars tell us about how fast the wind is blowing?

Isobars are close together, pressure

changes quickly from one location to another

High & low pressure on a weather map shows where air flows from

High-pressure to low-pressure

Air movement is called wind

Isobar Intervals

• High and Low pressure on a weather map shows us where air flows from areas of high pressure towards areas of low pressure

• The air movement is called wind