1. Welcome To Class If Minnesota is experiencing cold, wet (snow) weather, what kind of air mass might be affecting us?

2. Agenda Fronts –Foldable Severe Weather Weather instruments Weather Map Practice Review

3. Air Masses Large body of air with uniform characteristics Continental – form over land, dry Maritime – form over oceans, moist Tropical – warm Polar – cold

5. 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

6. Cold Front Weather Phenomenon Before FrontDuring FrontAfter Front TemperatureWarmSuddenly CoolerSteadily Cooler PressureLowLow, then increase Increasing Steadily PrecipitationMildSevereMild Usually bad weather Colder after they pass through High pressure – cold air is more dense than warm air

7. Warm Front Weather Phenomenon Before FrontDuring FrontAfter Front TemperatureCoolWarming suddenlyWarmer, then leveling off PressureDecreasing Suddenly Leveling offSlight rise followed by decrease PrecipitationShowers, snow, sleet, or drizzle Light DrizzleUsually none, otherwise mild Mild Weather Low Pressure Warmer temperatures (often humid)

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

9. Severe Weather Any weather that may cause property damage or loss of life Rain, hail, lightning, strong winds, tornadoes

10. Thunderstorms Storm with strong winds, heavy rain, lightning, and thunder

11. Hurricanes Tropical storm with very high wind speeds and heavy rains

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

13. Measuring Weather With your partner, find out how to measure the following Air Temperature Air Pressure Wind Speed Wind Direction Humidity Page 611-612

14. Weather Map Cold FrontWarm FrontStationary FrontOccluded Front

18. Weather Map Reading You and your partner will work together to answer the questions on the worksheet about weather maps –Turn in 1 worksheet