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Temperature

Can be affected by:

• Seasons - Most ares of the country have winter, spring, summer, and fall.
• Climate - Average temperatures are different across the US.
• Wind - The amount of wind makes the temperature feel colder or warmer. The wind chill effect makes a cold day feel even colder.
• Humidity - The amount of moisture in the air can affect the temperature. Humidity can make a warm day feel even warmer. This is sometimes called the Heat Index.

Precipitation...

• thunderstorms
• showers
• rain
• ice
• snow

Fronts and Air Masses

• A front is the leading edge of an air mass.
• An air mass is a large area of air with common characteristics (temperature, air pressure,humidity)
• A dry line separates a moist and humid air mass from a dry air mass.

Map Symbols of Fronts

	A stationary front is an air mass that is not moving.
	A cold front is an area of cooler air, not cold air. It is possible to have cold fronts in the summer. A cold front often triggers storms.
	A warm front is a leading edge of warmer air.
	An occluded front occurs when a faster moving cold front passes under a warm front, and catches up to another cold front.