DISCUSSION: As a weak low pressure system begins to develop along a nearly stationary frontal boundary, there will be an increasingly more favorable set-up in place for a freezing rain threat. This increasing freezing rain threat will be directly attirbuted to colder (and denser) air being pumped into the region undercutting warmer (and more buoyant) air being pumped into the region from the south. Thus, this will be creating an overrunning situation wherein hydrometeors (i.e., rainfall) falling through the warmer mid-level layer(s) melt the precipitation before it then falls through the colder layer close to (or possibly right at) the surface. Hence, this will likely make for a very treacherous Friday and Saturday as far as regional and national (ground and air) travel in concerned. Therefore, if you have a need to travel through this part of the United States over the next couple days as we approach the weekend timeframe, be sure to try to accomplish as possible so you will not be in a rush duringe the more treacherous travel conditions.
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©2017 Meteorologist Jordan Rabinowitz