The frontal zone will slowly sag southward from the Mid-Atlantic and Ohio Valley westward to the southern Plains through Friday. This front brought a renewed push of cool air behind it to the Upper Midwest and Great Lakes. Meanwhile, warm southerly winds are supplying a return flow of warmer, moister air northward.
The front will be the battleground area where air is forced to rise, leading to more showers and thunderstorms in areas that have already seen some activity since late Monday.
And not only will there be some modest Gulf of Mexico moisture coming up from the south in the lower atmosphere – but there may also be some moisture in the upper atmosphere coming from distant Miriam in the eastern Pacific, which could enhance some of the rainfall as early as Thursday.
Frontal Zone Impacts
As mentioned before, the front will make very little progress southward Wednesday through Friday. This should allow multiple rounds of showers and thunderstorms to affect the same areas from the Mid-Atlantic westward to the Ohio Valley and the southern Plains.Locally heavy rainfall amounts will continue to be possible and some locations could pick up one to three inches of rain the next few days. While the rain is beneficial for the drought areas, this will not be a drought-busting system. Much more rainfall is needed in the weeks and months ahead to provide extensive drought relief.In addition to the rain, isolated severe thunderstorms will be possible along the frontal zone like we saw on Tuesday. Locally damaging winds and hail are the main threats.http://www.weather.com/news/weather-forecast/front-plains-midwest-rain-20120924
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