What is an occlusion in weather?

In meteorology, an occluded front is a weather front formed during cyclogenesis. The classical view of an occluded front is that it initiates when a cold front overtakes a warm front, such that the warm air is separated (occluded) from the cyclone center at the surface.

What is occlusion in geography?

(Physical Geography) meteorol the line or plane occurring where the cold front of a depression has overtaken the warm front, raising the warm sector from ground level. Also called: occlusion.

What happens when an occlusion occurs?

At an occluded front, the cold air mass from the cold front meets the cool air that was ahead of the warm front. The warm air rises as these air masses come together. Occluded fronts usually form around areas of low atmospheric pressure.

What weather does an occluded front bring?

The warm air mass rises as the cool air masses push and meet in the middle. The temperature drops as the warm air mass is occluded, or “cut off,” from the ground and pushed upward. Such fronts can bring strong winds and heavy precipitation. Occluded fronts usually form around mature low pressure areas.

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What does a warm occluded front look like?

The symbol for an occluded front is a purple line with alternating triangles and semi-circles (also purple) pointing in the direction the front is moving. … Sometimes a cold front will “catch up” to a warm front and overtake both it and the cooler air out ahead of it.

What does the term occluded mean?

1 : to close up or block off : obstruct a thrombus occluding a coronary artery. 2 : to bring (upper and lower teeth) into occlusion. 3 : to take in and retain (a substance) in the interior rather than on an external surface : sorb proteins in precipitating may occlude alcohol.

How do you identify an occluded front?

Symbolically, an occluded front is represented by a solid line with alternating triangles and circles pointing the direction the front is moving. On colored weather maps, an occluded front is drawn with a solid purple line.

Which front brings the most severe weather?

Cold fronts occur when warm air is pushed up into the atmosphere by colder air at the ground. These fronts tend to move faster than the other types of fronts and are associated with the most violent types of weather such as severe and super cell thunderstorms, although any type of front can produce these same storms.

What causes wind?

Wind is the movement of air caused by the uneven heating of the Earth by the sun. … Warm equatorial air rises higher into the atmosphere and migrates toward the poles. This is a low-pressure system. At the same time, cooler, denser air moves over Earth’s surface toward the Equator to replace the heated air.

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What does a stationary front look like?

A stationary front is represented by alternating blue and red lines with blue triangles pointing towards the warmer air and red semicircles pointing towards the colder air. A noticeable temperature change and/or shift in wind direction is commonly observed when crossing from one side of a stationary front to the other.

What is another name for occluded front?

noun Meteorology. a composite front formed when a cold front overtakes a warm front and forces it aloft. Also called occlusion.

Do occluded fronts cause tornadoes?

Cold Occluded Front

Cold fronts are responsible for the strong, severe storms that can produce damaging winds, hail and tornadoes. The weather also tends to exhibit a dip in temperature prior to the storms and a drastic change in wind direction and speed.

What weather is caused by high pressure?

Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day.

What does a purple cold front mean?

Occluded fronts point to a decrease in intensity of the parent weather system and are indicated by a purple line with alternating triangles and half-moons on the side of its motion. While there is no difference in how they are depicted on a weather map, there are two types of occlusions; cold and warm.

How fast does an occluded front move?

Occluded Fronts. A newly formed occlusion will initially move at the same speed as the cold front that overtakes the warm front. Eventually, the occluded front “wraps around” the baroclinic low as the low moves off of the frontal boundary back into the colder air.

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What is a warm occlusion and where in the US does it usually occur?

The warm occlusion usually develops in the Northern Hemisphere when conditions north and of ahead of the warm front are such that low pa temperatures exist north of the warm front. … The occlusion is represented as a continuation of the warm front. The cold front aloft is usually represented on all surface charts.