Weather Outlook for September 4

The very sticky air mass will be slowly pushed eastward on Wednesday so that only the eastern third of the Commonwealth should remain mostly cloudy with a risk of more showers or a few thunderstorms. Fog and low clouds will envelope the western half of the state during the first few hours of daylight, but most sections will notice some breaks in the clouds during the afternoon. It will stay warmer than seasonal levels through Friday. A cool front will cross Pennsylvania later Thursday and stall just east of the state on Friday. Clouds and scattered thundershowers will accompany the front, but rainfall should be lighter and even less widespread than recent days. Temperatures in the wake of this front will return to seasonal values.

The weekend forecast is complicated by the disposition of soon to be hurricane Leslie in the southwest Atlantic. While Leslie is not expected to have any direct influence on the region, it is likely to pass west of Bermuda later Saturday and this combined with an upper level disturbance forming over the southern Appalachians should produce an area of rain from the Carolinas to eastern New England. Odds favor the eastern third of the state turning wet for a time with clouds extending across much of the rest of the region. Temperatures will slowly drop so that readings are expected to be below normal by early next week.

Several days of cool weather are likely during the first half of next week with valley fog each morning, but a surge of warmer weather is expected by the end of next week (Sept 14-16).

Contact Information:

Paul Knight/Pennsylvania State Climatologist/pgk2@psu.edu