The National Weather Service in Mount Holly, New Jersey, said most of the Lehigh Valley is under a moderate risk for flash flooding, meaning numerous flash floods are likely. Storms are expected to hit the area in the afternoon, and rain could fall at rates exceeding 2 inches per hour.

Heavy rain killed more than 30 people and forced authorities to evacuate tens of thousands as swaths of northern China were lashed by torrential downpours that sparked landslides and flooding,