A cold front is defined as the leading edge of a cooler mass of air, replacing (at ground level) a warmer mass of air, which lies within a fairly sharp surface trough of low pressure. It forms in the wake of an extratropical cyclone, at the leading edge of its cold air advection pattern, which is also known as the cyclone's dry conveyor belt circulation. Temperature changes across the boundary can be as much as 30 °C (54 °F). 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 less, a broad shield of rain can move in behind the front, which increases the temperature difference across the boundary. They are stronger in the fall and spring transition seasons, and weakest during the summer. When they catch up with the preceding warm front, the portion of the boundary which does so is then known as an occluded front.
Read more about Cold Front: Development of Cold Front, Precipitation, Temperature Changes, Characteristics of Boundaries Around An Extratropical Cyclone
Famous quotes containing the words cold and/or front:
“Half-opening her lips to the frost’s morning sigh, how strangely the rose has smiled on a swift-fleeting day of September!
How audacious it is to advance in stately manner before the blue-tit fluttering in the shrubs that have long lost their leaves, like a queen with the spring’s greeting on her lips;
to bloom with steadfast hope that, parted from the cold flower-bed, she may be the last to cling, intoxicated, to a young hostess’s breast.”
—Afanasi Fet (1820–1892)
“A man’s destination is his own village,
His own cooking fire, and his wife’s cooking;
To sit in front of his own door at sunset
And see his grandson, and his neighbour’s grandson
Playing in the dust together.”
—T.S. (Thomas Stearns)