1. WEATHER PATTERNS

2. VOCABULARY Weather- the temperature, humidity, precipitation, and wind at a particular place and time. Weather- the temperature, humidity, precipitation, and wind at a particular place and time. Air mass- a large area of air that has the same temperature and amount of water (humidity.) Air mass- a large area of air that has the same temperature and amount of water (humidity.) Cold front- a place where cold air pushes warm air up. Cold front- a place where cold air pushes warm air up. Warm front- a place where warm air moves over cold air. Warm front- a place where warm air moves over cold air.

3. HOW WEATHER CHANGES An air mass is a big area of air that has the same temperature and humidity. An air mass can be warm or cold. Sometimes cold air masses meet warm air masses. An air mass is a big area of air that has the same temperature and humidity. An air mass can be warm or cold. Sometimes cold air masses meet warm air masses. The places where air masses meet are called fronts. Weather changes along fronts. The places where air masses meet are called fronts. Weather changes along fronts.

4. COLD FRONT A cold front ALWAYS brings tall clouds with moderate to heavy rain along with moderate to severe wind. A cold front ALWAYS brings tall clouds with moderate to heavy rain along with moderate to severe wind.

5. COLD FRONT

11. WARM FRONT A warm front happens when warm air blows into cold air. The warm air moves up slowly over the cold air. A warm front happens when warm air blows into cold air. The warm air moves up slowly over the cold air. Water condenses into a long line of clouds. The rain that follows is a gentle rain with soft winds. Water condenses into a long line of clouds. The rain that follows is a gentle rain with soft winds.

12. WARM FRONT