Summerlike warmth will advance into Pittsburgh on Thursday and last into Friday before an unsettled weekend.
A stationary front will split the Northeast between a pocket of cool air and summerlike warmth, but the Pittsburgh area will be on the warm side.
On Thursday, highs in the 80s will be common across much of western Pennsylvania, Ohio, West Virginia and western Maryland.
Cool air is expected to be bottled up farther to the north and east over the mid-Atlantic.
Temperatures will stop short of record levels. Record highs rare in the upper 80s to low 90s this time of the year around Pittsburgh.
The warm weather should stick around into the weekend, although temperatures will ease back a bit due to more extensive cloud cover and the chance of showers and thunderstorms.
A tropical wave is likely to become the Atlantic Basin's next tropical storm as it approaches or crosses the Caribbean Sea later this week.
Bouts of wet weather will soak the northeastern United States during the last full week of September.
Typhoon Megi will threaten lives and property across Taiwan and eastern China into the middle of the week.
Gusty winds will accompany a push of chilly air across the Great Lakes through Tuesday.
The final day of September will bring a rare lunar event that hasn’t occurred since March of 2014, a Black Moon.
Following some rain and gusty winds on Tuesday, a strong storm will target the United Kingdom on Thursday.
Cape Hatteras, NC (1989)
Rained every day from the 12th to the 25th for a total of 15.51 inches. Normal for all of September is 5.78 inches.
Portland, ME (1991)
Record combined August-September rainfall of 19.65 inches up to Sept. 25. Old record was 14.65 inches in August-September 1954.
Clearfield, PA (1994)
Tornado touched down.