The Midlands saw little rain on Wednesday. In fact, Columbia Metro Airport saw just a “trace” of rain.
However, we did see a cool weather feature. A “wake low” developed behind an area of storms moving across Georgia and southern South Carolina.
A wake low is a mesoscale, which means small, area of low pressure that typically forms behind a line of storms. It forms as air sinks behind the line of storms creating a pressure difference, or pressure gradient, with a mesoscale high just behind the leading edge of the storms.
That pressure difference creates windy conditions in an area where there are no storms. We call this non-thunderstorm wind damage.
Here is a graphic from UCAR that shows this process.
As a result we saw a few non-thunderstorm wind and damage reports with trees being knocked down.
I noticed our Weatherbug site near the Opera House in Newberry had a wind gust of 46 mph. Downtown Newberry saw a few trees knocked down, which resulted in a power outage. The Fairfield County Airport reported a wind gust of 39 mph. Numerous trees also got knocked down in Saluda county and McCormick county.
A cool weather phenomenon despite the busted forecast for more rain and storms.