Information AboutCold Front |
| CATEGORIES ABOUT COLD FRONT | |
| weather fronts | |
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A cold front is defined as the leading edge of a cooler and drier mass of air.University of Illinois. Cold Front. Retrieved on 2006-10-22. The air with greater density wedges under the less dense warmer air, lifting it, which can cause the formation a narrow line of showers and thunderstorms when enough moisture is present. This upward motion causes lowered pressure along the cold front. On Weather Map s, the surface position of the cold front is marked with the symbol of a blue line of triangles/spikes (pips) pointing in the direction of travel. Cold fronts can move up to twice as fast as Warm Front s. MOVEMENT Cold fronts are closely associated with low pressure systems, normally lying equatorward of these Cyclone s, at the leading edge of high pressure systems and, in the case of the polar front, at approximately the equatorward edge of the high-level polar Jet Stream . The stronger its parent cyclone is, the faster and farther south the cold front will progress. The colder air behind these boundaries, due to its increased density, wedges under the less dense warmer air, lifting it, causing the formation of clouds with vertical development, the cumulus variety. If enough moisture is present, a narrow line of showers and thunderstorms is coincident with the frontal boundary. Squall Line s, Tornado es, and Snow can be associated with a cold frontal passage. The passage of a cold front usually results in a wind shift from southwest to northwest in the northern hemisphere and from northwest to southwest in the southern hemisphere. The air behind the cold front is generally drier and cooler than that which it is replacing. On weather maps, the surface position of the cold front is marked with the symbol of a blue line of triangles/spikes (pips) pointing in the direction of travel. Cold fronts can move up to twice as fast as warm fronts. The movement of cold fronts can be slowed down by geographic features like Mountain s and large bodies of warm water.David Roth. Hydrometeorological Prediction Center. Unified Surface Analysis Manual. Retrieved on 2006-10-22. SEE ALSO REFERENCES EXTERNAL LINKS |
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