Warm Up 1.What is weather? 2.What creates weather?

A weather front is a “battle” between two different air masses that are touching.

Imagine two water balloons that are filled with water of different temperatures. If you hold one in each hand and push them together, the places the balloons touch is the boundary between the two balloons. This would be the balloon “front.”

. Notice that the colder (blue) air is pushing the other air out of the way. It is “winning the pushing battle.” Notice the symbol for a cold front!

Notice the kinds of clouds at a cold front.

Cold front facts to know: 1. Moves quickly 3. Produces cumulus first. 2. Rapid “uplift” of air occurs due to the cold air lifting the warm air. 4. Often produces severe weather (tornadoes, hail, lightning). 5. Cooler, drier air follows.

Cold front Drier, cooler air mass

A warmer air mass is pushing into a cooler air mass. Because warm air is less dense, it gets pushed over the cooler air mass.

Notice the kinds of clouds at a warm front.

Facts to know about warm fronts! 1. Warm air moves over cold 2. Often begins with cirrus clouds followed by stratus. 3. Produces light to moderate rain. 4. After it passes, warmer weather.

Sometimes is you are observant, you can see the front!

H stands for a high pressure air mass and L means low pressure.

Wind map

Combination map used for TV and internet

Another combination map – Can you read it?

Humidity map