A frontal boundary will move through the region late in the day today, and may provoke some isolated thunderstorms. The concern rests overnight, however, with the nocturnal lower level jet stream amping up and providing a safe haven for strong clusters of showers and storms to develop. Given the strengthened lower level jet stream, wind shear in the midst of elevated instability will most likely give way to storms capable of damaging winds and hail. Due to the shearing, a tornado has potential to form as well, but this is not a big concern.
Strong storms have developed in the Northeast and Ohio Valley and are expected to continue to develop and strengthen, with Round 2 possible overnight. Despite the loss of daytime heating, a disturbance with shearing will move into the area and promote severe weather overnight. Large hail and damaging winds are possible.