Residents in the Susquehanna Valley should prepare for potential flash flooding, especially near small streams and creeks. Roads may experience ponding, and driving through flooded areas is strongly discouraged. The Heat Advisory indicates a risk of heat-related illnesses, particularly for vulnerable populations. Severe weather risks include damaging wind gusts, heavy rainfall, and isolated hail, primarily west of the Susquehanna River. Fog may develop overnight, reducing visibility for drivers.