Cool, wet weather is expected from the Southwest to the southern Plains, with locally heavy rainfall amounts and flooding possible.
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A cold front will continue to sink south across the southern Plains and lower Mississippi Valley today.
Meanwhile, increasing moisture, including remnant moisture from what was tropical cyclone Jova, is expected to interact with a series of weak upper level disturbances to support shower and thunderstorm development across the region through midweek.
Some of these storms may produce locally heavy rains, with flash flooding possible, especially in vulnerable areas where rapid runoff is likely.
A greater threat for heavy rainfall and possible flash flooding is expected to center over southeastern Arizona and southern New Mexico today, before shifting farther east into the southern High Plains on Wednesday.
Meanwhile, showers and thunderstorms will move along the leading edge of the cooler air as it advances from the Midwest into the eastern U.S.
As subtropical moisture begins to surge north ahead of the front, the threat for heavy rain is forecast to increase as it moves into the Northeast beginning late Tuesday and continuing into Wednesday.
Heavy rains that do occur may produce flooding, especially across areas impacted by heavy amounts earlier this week.
High pressure will settle in behind the front, with dry conditions expected across much of the Midwest Wednesday into Thursday.
Across portions of the upper Midwest, temperatures are expected to drop near freezing Wednesday morning -- prompting frost advisories for parts of northeastern Minnesota and northwestern Wisconsin.
Although Hurricane Lee remains well offshore, dangerous surf and rip currents are impacting portions of the southeastern U.S. coast.
As the storm turns north, these conditions are forecast to spread northward along much of the East Coast over the next couple of days. ■
A clipper system will move quickly across the northern Plains into the Midwest Friday and the Northeast by Saturday, bringing a wintry mix of rain and snow showers ahead of a sweeping cold front.