FRONT Where air masses meet and do not mix.
4 Types of weather fronts: Cold Front Warm Front Stationary Front Occluded Front
Cold Front When a fast moving cold air mass runs into a slow moving warm air mass and the thicker cold air slides under the lighter warmer air.
Cold Fronts bring: • Intense but short-lived precipitation • Thunderstorms • Occasionally even Tornadoes!!
A cold front symbol—The direction that the teeth point indicate the direction the front is moving.
Warm Front When a moving warm air mass collides with a slowly moving cold air mass and the warm air moves over the cold air.
Warm Fronts bring: • Before the warm front passes, the temperature is cool with significant precipitation (depending on geography) such as rain or snow or sleet. • While the front passes, the temperature warms suddenly with light precipitation. • Afterwards, the temperature remains warm with little or no precipitation and few clouds. • The warm front slopes gently up into the troposphere that has a direct bearing on the kinds of clouds that are produced. As the warm air behind the front collides with the cooler air ahead, the warmer less dense air is forced to glide upward.
Warm Front symbol—The directions that the bumps face is the direction the front is moving.
Stationary Front When a cold air mass and warm air mass meet, but neither air mass has enough force to move the other air mass.
Occluded Front When a warm air mass is caught between two cooler air masses and the thicker cold air masses move underneath the thinner warm air mass and push it upward.
Occluded Fronts bring: • Rain or snow • Long-term precipitation • Possible thunderstorms
Occluded front symbol – The directions that the bumps face is the direction the front is moving.