9/13 – Chris’s “Unstable Pattern” Wednesday Afternoon Forecast

An upper level trough of low pressure currently moving across the Great Lakes will continue to move through the Ohio River Valley today. With the base of the trough of low pressure generally north of Tennessee, the stalled frontal boundary associated with this trough will struggle to make it much further than its current position just south of the I-20 corridor. As the day progresses, daytime heating will help initiate isolated showers and thunderstorms as above seasonal temperatures will average the low 90s, however a few locations could struggle to make it out of the upper 80s. Thursday looks to be similar as a stalled frontal boundary remains in place across the area. It may move southward slightly; however it’s not going to have a huge impact on shower and thunderstorm development. Just the presence of this front will be the main focal point for daily activity through the short-term forecast..

As for Friday into the weekend, shower and thunderstorm chances will continue to be elevated as the stalled front overhead lingers through Sunday. On Sunday a cold front will be in the northern portions of the state keeping daytime high temperatures above average, until the front slips through the area Tuesday. Cooler temperatures and plenty of sunshine will follow frontal passage.