A severe weather threat continues for areas under Severe Thunderstorm Watch 638. The watch is valid until a specified time. A cluster of supercells may grow and pose a risk of damaging wind and large hail over the next few hours.

Scattered convection has been reported, with potential for growth early in the evening. The activity is expected to track in a certain direction over time. Further details on the severe weather threat and affected areas are available from the Storm Prediction Center.

The affected areas include parts of Pennsylvania and New Jersey, extending into the DelMarVa region. For more information, refer to Mesoscale Discussion 2189 from the Storm Prediction Center.