...Rain and thunderstorms expected in the east...
...Scattered showers and storms likely for the Pacific Northwest, northern Plains, and eventually the Mississippi Valley...
...Well above average temperatures expected across the central Plains states...
An upper level trough will continue to make its way eastward through the Mid-Atlantic states this evening and into the day on Tuesday. Just ahead of this, the associated surface boundary will continue to fuel widespread showers and thunderstorms, with embedded heavier areas, across much of the entire Eastern Seaboard this evening and into the overnight hours Monday.
By Tuesday morning, the precipitation should become more scattered and isolated in the Mid-Atlantic and Southeast once the cold front exits the coast and weakens over the Atlantic.
Farther north and west into New England and the Great Lakes, light to moderate rain is expected to continue throughout the day on Tuesday and into Wednesday as the system makes its way offshore.
Elsewhere, a fairly weak frontal boundary draped across the northern
Plains will focus a few showers across the area tonight and throughout the day on Tuesday.
As the eastern portion of this front, which stretches into the Middle Mississippi Valley, becomes more robust on Tuesday night, showers and thunderstorms should become more widespread in nature with the potential for severe weather across the Ohio Valley on Wednesday as forecast by the Storm Prediction Center.
South of this boundary, across the central Plains, an upper ridge sets in which will push temperatures well into the above normal range with many places reaching the triple digits on Tuesday.
Out west, an upper level system will move onshore in the Pacific Northwest initiating a frontal boundary at the surface by early Tuesday. Scattered rain and thunderstorms are likely across the northwest states and eventually into the northern Rockies on Tuesday as the front moves through the mountains.