Dense fog and rain forecast for Western Pennsylvania Sunday
- Dense fog and cooler temperatures were reported in Western Pennsylvania on Sunday morning, with a Dense Fog Advisory in effect until 10 a.m.
- The region is expected to experience several disturbances bringing chances for showers and storms starting Sunday night through Wednesday.
- By the end of the week, there may be returning showers as a low-pressure system approaches from the southwest.
Sunday morning in Western Pennsylvania began with cooler temperatures and dense fog, prompting a Dense Fog Advisory for many counties until 10 a.m. Visibility was expected to drop below a quarter of a mile in some areas. As the day progressed, the fog was anticipated to clear by midday due to daytime heating, leading to a partly cloudy afternoon with temperatures reaching the low to upper 80s, which is above normal for this time of year. Looking ahead, the region is set to experience several disturbances starting Sunday night through Wednesday, bringing increased chances for showers and storms. The first disturbance is expected to arrive Monday morning, potentially bringing a decaying complex of showers and storms, particularly affecting areas along I-80 and southeast toward the Laurel Highlands and northern West Virginia. On Tuesday, a stronger low-pressure system will move into Central Ohio, leading to bands of showers and storms entering Western Pennsylvania by midday. While severe weather potential may be limited due to cloud cover, some storms could still become severe across the border in Ohio due to higher instability and wind shear. By Wednesday night, forecasts indicate widespread rainfall of 1-1.5 inches across the region, marking the most significant precipitation seen this month. As the week progresses, uncertainty in the forecast increases, with potential for returning showers next weekend as a low-pressure system lingers to the southwest.