For the period of intensely cold and dry weather, see Cold wave. For other uses, see Cold Front.
A cold front is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure. It often forms behind an extratropical cyclone (to the west in the Northern Hemisphere, to the east in the Southern), at the leading edge of its cold air advection pattern—known as the cyclone's dry "conveyor belt" flow. Temperature differences across the boundary can exceed 30 °C (54 °F) from one side to the other. When enough moisture is present, rain can occur along the boundary. If there is significant instability along the boundary, a narrow line of thunderstorms can form along the frontal zone. If instability is weak,[clarification needed] a broad shield of rain can move in behind the front, and evaporative cooling of the rain can increase the temperature difference across the front. Cold fronts are stronger in the fall and spring transition seasons and are weakest during the summer.
The symbol of a cold front: a blue line with triangles pointing in the direction of travelA cold front over the eastern and central region of the United States of America
A coldfront is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough...
For instance, coldfronts can bring bands of thunderstorms and cumulonimbus precipitation or be preceded by squall lines, while warm fronts are usually...
to be broader and weaker than that of a coldfront. Warm fronts move more slowly than coldfronts because cold air is denser, and is only pushed along...
A backdoor coldfront, or backdoor front, is a coldfront moving south or southwest along the northeast of the Atlantic seaboard in North America, particularly...
occluded front is a type of weather front formed during cyclogenesis. The classical and usual view of an occluded front is that it starts when a coldfront overtakes...
Warm fronts lie within broader troughs of low pressure than coldfronts, and move more slowly than the coldfronts which usually follow because cold air...
The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the...
A cold wave (known in some regions as a cold snap, cold spell or Arctic Snap) is a weather phenomenon that is distinguished by a cooling of the air. Specifically...
Cold is the presence of low temperature, especially in the atmosphere. In common usage, cold is often a subjective perception. A lower bound to temperature...
gust front, is a storm-scale or mesoscale boundary separating thunderstorm-cooled air (outflow) from the surrounding air; similar in effect to a cold front...
rainbands become active enough just ahead of a coldfront, they can mask the location of the coldfront itself. Banding within the comma head precipitation...
of thunderstorms, forming along the shallow cold air currents of some sea breeze boundaries and coldfronts. A shelf cloud is a low, horizontal, wedge-shaped...
form weather fronts as the cyclonic circulation closes and intensifies. Later in their life cycle, extratropical cyclones occlude as cold air masses undercut...
warmer air mass and red domes facing the colder air mass. A stationary front may form when a cold or warm front slows down or grows over time from underlying...
the Yellow River Stone Forest in Jingtai County, Gansu, China. When a coldfront struck, rain and possibly graupel were carried by gusts reaching level...
enough just ahead of a coldfront, they can mask the location of the coldfront itself. Once a cyclone occludes an occluded front (a trough of warm air...
region. Instead, the coalescence of several weather features—including a coldfront, a dry line, and a gravity wave—provided locally favorable conditions...
The Arctic front is the semipermanent, semi-continuous weather front between the cold arctic air mass and the warmer air of the polar cell. It can also...
strengthens, the coldfront sweeps towards the equator and moves around the back of the cyclone. Meanwhile, its associated warm front progresses more slowly...
fronts generally move from west to east, while warm fronts move poleward. Because of the greater density of air in their wake, coldfronts and cold occlusions...
that can form along or ahead of a coldfront. In the early 20th century, the term was used as a synonym for coldfront. The squall line contains heavy precipitation...
pronounced in the spring and summer months and can cause strong coldfronts to form. These coldfronts can be responsible for all sorts of severe weather from...
lake-modified synoptic scale coldfronts that result in one-hour temperature drops of 16 °F (8.9 °C) or greater. While pneumonia fronts occur primarily in the...
World Class Championship Wrestling and Century Wrestling Alliance / NWA ColdFront / NWA New England, holding championships on several occasions. Victor...
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