A low pressure system will bring major impacts to the eastern third of the country on Tuesday, while a ridge of high pressure influences warm and dry conditions across the Southwest.
A strong low pressure system will trek northeastward from the eastern Tennessee Valley to the Northeast. Heavy snow and freezing rain will spread across the eastern Ohio Valley, the interior Mid-Atlantic and the Northeast. Wintry precipitation will transition to sleet and rain by the second half of Tuesday as arctic air retreats northward. Prolonged heavy rain will bring threats of flash flooding to eastern Pennsylvania, New York and a large portion of New England. The heaviest snow showers are forecast to develop over northwest Pennsylvania and western New York. A cold frontal boundary extending southward will initiate rain and thunderstorms across the southern Mid-Atlantic and parts of the Southeast.
Meanwhile, a wave of low pressure will move southeastward from the northern Plains to the Tennessee Valley. This system will usher moderate to heavy snow across the northern Plains and the upper Mississippi Valley. A mixture of rain and snow can be expected from the middle Mississippi Valley to the Tennessee Valley.
A separate system will push eastward across the Northwest and the upper Intermountain West. Rain and high elevation snow will develop from the Pacific Northwest to the northern high Plains. High pressure will keep conditions warm and dry across the Southwest on Tuesday.
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