Welcome To Class

If Minnesota is experiencing cold, wet weather, what kind of air mass might be

affecting us?

Agenda

• Fronts

• Weather Map Practice

Air Masses• Large body of air with uniform characteristics

• Continental – form over land, dry

• Maritime – form over oceans, moist

• Tropical – warm

• Polar – cold

Cold FrontBefore Front During Front After Front

Temperature Warm Suddenly Cooler Steadily Cooler

Pressure Low Low, then increase

Increasing Steadily

Precipitation Mild Severe Mild

•Usually bad weather

•Colder after they pass through

•Low pressure before High pressure after

Warm FrontBefore Front During Front After Front

Temperature Cool Warming suddenly Warmer, then leveling off

Pressure DecreasingSuddenly

Leveling off Slight rise followed by decrease

Precipitation Showers, snow, sleet, or drizzle

Light Drizzle Usually none, otherwise mild

•Mild Weather

•High Pressure before Low pressure after

•Warmer temperatures (often humid)

Question

After a major thunderstorm in the summer, what kind of front do you believe would be present? What would the pressure feel like?

Measuring WeatherFind out what instruments we use to measure the

following:

• Air Temperature

• Air Pressure

• Wind Speed

• Wind Direction

• Humidity

Page 611-612

Weather Map

Cold Front Warm Front Stationary Front Occluded Front

Weather Map Reading

• You and your partner will work together to answer the questions on the worksheet about weather maps– Turn in 1 worksheet