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.
Following a bout of stormy weather that has lingered through the week, drier and more tranquil weather will move into the Atlanta area for the weekend.
Chicago is facing a mostly clear weekend with the threat of some disruptive thunderstorms on Saturday.
The peak of hurricane season, among other things, arrives in the fall.
A search for a sheriff's deputy in Austin, Texas, will continue Friday, after she called for help as she was trapped in flood waters.
Odile and other weather systems will bring both dangerous flooding and drought-busting rain in parts of Texas and the southern Plains.