Heavy rainfall from storms affected parts of Western Pennsylvania and Northern West Virginia on Saturday, leading to isolated rain totals of 1-3 inches across the I-80 corridor and areas of Washington and Monongalia counties. Flash flood warnings were issued as a result.
Reports indicated that water rescues were necessary in the South Strabane area of Washington County late Saturday night, although the water levels have since receded. Forecasts suggest a similar weather pattern for Sunday, where some regions may experience minimal rainfall while others could face another round of heavy rain and flash flood threats.
Dense fog was reported Sunday morning along the I-79 and throughout most of the Ohio Valley, continuing until around 9 a.m. High moisture levels are expected to persist, particularly southwest of Pittsburgh, where conditions could push moisture levels into the 90th percentile later in the afternoon.
Although not everyone will experience significant rainfall, slow-moving storms that do develop could result in heavy rain, with flash flooding becoming a concern if areas receive over 0.75 to 1 inch of rain in an hour. The estimated rainfall for some isolated regions could reach 3-4 inches.
After sunset, ongoing thunderstorms are projected to diminish, leading to mostly cloudy skies with some lingering showers overnight into Monday morning. Expect patchy dense fog again before temperatures rise, prompting isolated to scattered storms by midday and evening. Daytime highs are forecasted to reach the upper 70s to low 80s.
An increase in rain chances is anticipated for Tuesday, driven by a wave of low pressure moving into the area from the west. This system is expected to bring heavy rain and the potential for localized flooding, particularly in the late morning to mid-afternoon hours.
Looking ahead, the weather pattern will shift as warm and humid air from the southwest precedes a stronger storm system and cold front on Wednesday night into Thursday, raising the risk of severe storms and additional flash flooding. By Friday, a slightly cooler and drier air mass is predicted to settle in.
Stay informed by using the available weather resources, including the latest updates from local weather services.