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wake low
A wake low, or wake depression, is a mesoscale low-pressure area which trails the mesoscale high following a squall line.〔Glossary of Meteorology (2009). (Wake Low. ) American Meteorological Society. Retrieved on 2009-04-24.〕 Due to the subsiding warm air associated with the systems formation, clearing skies are associated with the wake low. Once difficult to detect in surface weather observations due to their broad spacing, the formation of mesoscale weather station networks, or mesonets, has increased their detection.〔Mark R. Conder, Steven R. Cobb, and Gary D. Skwira (2006). (West Texas Mesonet Observations of Wake Lows and Heat Bursts Across Northwest Texas. ) American Meteorological Society. Retrieved on 2009-04-24.〕 Severe weather, in the form of high winds, can be generated by the wake low when the pressure difference between the mesohigh preceding it and the wake low is intense enough.〔David M. Gaffin (1995). (Wake Low Severe Wind Events in the Mississippi River Valley: A Case Study of Two Contrasting Events. ) National Weather Service Forecast Office Memphis, Tennessee. Retrieved on 2009-04-24.〕 When the squall line is in the process of decay, heat bursts can be generated near the wake low. Once new thunderstorm activity along the squall line ends, the wake low associated with it weakens in tandem.
==Formation==
Wake lows form due to adiabatic warming in the wake of mature squall lines at the back edge of their rain shields, where evaporative cooling is unable to offset warming due to atmospheric subsidence, or downward motion. They can be caused by gravity waves which duct through boundary layers which are deep and cold to the north of a weather front. As with mesoscale high-pressure areas behind a squall line, when new thunderstorm development stops along the squall line, the wake low will weaken as well. Clearing conditions will accompany the wake low, due to the descending warm air mass associated with the feature. Within the United States, these systems have been observed to form in the Mississippi river valley,〔 Southeast,〔National Weather Service Office Huntsville, Alabama (2009). (April 12-13, 2009 Wake Low Event. ) Retrieved on 2009-04-23.〕 Florida, and Great Plains.〔Robert R. Handel and Pablo Santos (2005). (P4.6 Observations From the 13 April 2004 Wake Low Damaging Wind Event In South Florida. ) American Meteorological Society. Retrieved on 2009-04-24.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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