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Illustration of a warm front
A warm front is defined as the leading edge of a mass of warm air. Warm fronts move more slowly than the cold front which usually follows due to the fact that cold air is more dense, and harder to remove from the earth's surface. If the warm air mass is stable, clouds ahead of the warm front are mostly stratiform and rainfall gradually increases as the front approaches. At the front itself, the clouds can reach the surface as fog. Clearing and warming is usually rapid after frontal passage. If the warm air mass is unstable, thunderstorms may be embedded among the stratiform clouds ahead of the front, and after frontal passage, thundershowers may continue. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Golden Gate Bridge in Fog Evening fog obscures Londons Tower Bridge from passers by. ...
In the northern hemisphere a warm front usually causes a shift of wind from southeast to southwest and in the southern hemisphere from northeast to northwest.
The warm front symbol: a line with semicircles pointing in the direction of the advancement of the front
On weather maps, the surface location of a warm front is marked with a red line of half circles pointing in the direction of travel. Image File history File links This is a lossless scalable vector image. ... Image File history File links This is a lossless scalable vector image. ... These symbols, showing various weather fronts, might be found on a weather map. ...
a warm front may also last for days before rain occours. The warm front will start with very high, flat clouds, and then become lower and fluffier before it rains. A fictitious synoptic chart of an extratropical cyclone affecting the UK & Ireland. ... A surface weather analysis for the United States on October 21, 2006. ... Image:NWS weather fronts. ...
Relatively cool or cold air is present ahead of a warmfront with warmer air behind the front, i.e., the opposite from that of cold fronts.
A stationary front is similar to a warmfront, i.e., warm air is present behind it (to its south) with cool air ahead of it (to its north).
Warm air is located ahead of the cold front and behind the warmfront (the so-called "warm sector"), while cool air exists ahead of the warmfront and cold air is present behind the cold front.
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