The same storm system that began producing severe weather and torrential rain in the southern United States Monday will pivot northeastward and is poised to set off severe thunderstorms from the mid-Atlantic coast to the Midwest Thursday, AccuWeather meteorologists warn. Some heavy and gusty storms may also roll through New England before the end of the week. Those with outdoor or travel plans may have to do more than dodge raindrops and flooding in the Midwest and Northeast. Severe weather coul