Welcome To Class

If Minnesota is experiencing cold, wet (snow) weather, what kind of air mass

might be affecting us?

Agenda

• Fronts– Foldable

• Severe Weather

• Weather instruments

• Weather Map Practice

• Review

Air Masses• Large body of air with uniform characteristics

• Continental – form over land, dry

• Maritime – form over oceans, moist

• Tropical – warm

• Polar – cold

Fronts

• Cold Front• Warm Front• Stationary Front• Occluded Front

• Page 605-606

• Four corner fold• Each type of front• Picture of each with

symbols used weather map

• Description of each• Clouds formed• Precipitation (if any)/

weather

Cold FrontWeather Phenomenon

Before 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

•High pressure – cold air is more dense than warm air

Warm FrontWeather Phenomenon

Before Front During Front After Front

Temperature Cool Warming suddenly Warmer, then leveling off

Pressure Decreasing Suddenly

Leveling off Slight rise followed by decrease

Precipitation Showers, snow, sleet, or drizzle

Light Drizzle Usually none, otherwise mild

•Mild Weather

•Low Pressure

•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?

Severe Weather

• Any weather that may cause property damage or loss of life

• Rain, hail, lightning, strong winds, tornadoes

Thunderstorms

• Storm with strong winds, heavy rain, lightning, and thunder

Hurricanes

• Tropical storm with very high wind speeds and heavy rains

Tornadoes

• destructive, rotating column of air with very high wind speeds and visible as a funnel shaped cloud

Measuring WeatherWith your partner, find out how 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