What Is A Cold Front?

Tools

By By Steve Pool

SEATTLE - A front is a boundary between warm and cold air. With a cold front, you have an area of cold air moving into an area of warm air. You can pick them out on weather maps as a blue line with blue triangles. The triangles point in the direction the front is moving.

Since cold air is heavier than warm air, the cold air pushes underneath the warm air, causing the warm air to rise. The warm air then condenses as it reaches cooler altitudes, creating clouds and, eventually, precipitation.

If the difference in temperatures is very large, you can get a strong front that can create thunderstorms, or even tornadoes. Luckily around here, the Pacific Ocean keeps the temperatures differences to a minimum.

For More Information:

www.usatoday.com.

Your Photos

YouNews Up! Up! And away! Up! Up! And away!
When I saw this dramatic cloud to the north, it reminded me of smoke, rising in billows until it hits the jet stream, then it's pulled hundreds of miles east. I had to capture it quickly. Within minutes the effect had faded.
YouNews Inside an osprey nest Inside an osprey nest
For my girlfriends birthday we had a party at her parents. We knew the nest was there but the owner hadn't seen or heard the osprey for a day or two. He asked me to fly my drone up and see if any was wrong. I flew up and found that there were two eggs inside.
YouNews Our Garden Our Garden
The growing season has been great.

The secret to this garden is simple.
I used recycled grass clippings.