So what is a wake low? According to the American Meteorological Society, a wake low is defined as:
"A surface low pressure area or mesolow (or the envelope of several low pressure areas) to the rear of a squall line; most commonly found in squall lines with trailing stratiform precipitation regions, in which case the axis of the low is positioned near the back edge of the stratiform rain area."In other words, sometimes trailing a squall line a mesoscale (small scale) low pressure system will form. Typically it will trail a mesoscale high pressure system than forms immediately behind the squall line. In many instances, the meso, or wake, low will be aligned along the back edge of stratiform (steady rain) precipitation trailing the line of storms as air sinks, thus warming and also drying the back edge of precipitation. The pressure gradient between the meso high and meso low creates a scenario in which a localized area of high wind can develop. (Weather geeks will recall that wind increases when the gradient between two pressure systems increases. A strong high pressure system in close proximity to a strong low pressure system produces very strong wind.)
Below are some pictures submitted to us on Twitter, as well as a 6 hour radar loop from 5-11am showing the decay of the squall line. The wake low formed in the last hour of the loop on the back side of the light precipitation.
Tree and lines down at Sea Isle & Dearing, right by the Perkins exit on 240. @memphisweather1 #memstorm pic.twitter.com/a28GvOG9JS— Lauren Reaves (@LaurenPatrice) April 30, 2016
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