What is Weather front?
[[Image:NWS_weather_fronts.svg|thumb|right|300px|A guide to the symbols for weather fronts that may be found on a weather map: #1 [[cold front]]; #2 warm front; #3 stationary front; #4 occluded front; #5 surface trough; #6 squall/shear line; #7 dry line; #8 [[tropical wave]]; #9 trowal ]] A '''weather front''' is a boundary in between two masses of air of different [[density|densities]], and is the main cause of significant weather. In surface weather analysis, fronts are depicted using various colored lines and symbols.The air masses separated by a front usually differ in [[temperature]] and [[humidity]]. [[Cold front]]s may feature narrow bands of [[thunderstorm]]s and [[severe weather]], and may on occasion be preceded by [[squall line]]s or [[dry line]]s. [[Warm front]]s are usually preceded by layered [[Precipitation (meteorology)|precipitation]] and [[fog]]. The weather usually quickly clears after a front passes Some fronts produce no precipitation and little cloudiness,although there is usually a wind shift. {{weather-stub}} [[Category:Geography]] [[Category:Meteorology]]