A dry weekend will follow the midweek's unsettled weather around Pittsburgh.
Warm and humid air that moved in recently will be slow to leave, despite an impressive push of cool air farther to the east over the mid-Atlantic.
Spotty showers are possible on Thursday.
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Late in the week the moisture will be squeezed to the south and west as cooler air mixes in from the north and east.
The result will be a reduction in not only shower activity, but also lower humidity levels that should carry through the coming weekend.
Showers and drenching thunderstorms will return on Tuesday as the warmth hangs on and humidity increases.
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Locally heavy lake-effect snow will hinder travel downwind of the Great Lakes to end the week.
Cyclonic Storm Vardah in the Bay of Bengal will strengthen as it tracks westward toward India this week.
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The coldest air so far this season will continue to sweep across the central and eastern United States into the weekend.
The first substantial snow and ice storm of the season will hit travel hard along the Interstate 5 corridor, as well as the interior northwestern U.S. into Thursday night.
A surge of milder air will bring the warmest air since mid-November to the United Kingdom this week.