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Updated: 2:00 PM GMT on April 21, 2015
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Weather Underground Forecast for Tuesday, April 21, 2015

A trough of low pressure will begin to set up along the West Coast on Tuesday, while an area of low pressure will shift across the Great Lakes.

A large low pressure system will inch eastward over southern Canada and the Great Lakes. This system will continue to usher light snow showers over portions of the upper Midwest, while moderate rain will spread eastward over the northern Mid-Atlantic and New England. Rain totals could exceed one inch across portions of New England. A cold frontal boundary associated with this system will extend across the western Atlantic and the Southeast. This frontal boundary will generate showers and thunderstorms across Florida on Tuesday.

Just to the west, isolated showers and thunderstorms will be possible across the Ohio Valley, the Tennessee Valley, the middle Mississippi Valley, the central Plains and the southern Plains. In addition, high elevation snow showers will linger over the central Rockies.

A trough of low pressure will take shape over the West Coast. This system will send impulses of energy across the Sierra Nevada Mountains, which could lead to afternoon showers and stray thunderstorms across the region. Conditions will remain warm and dry across the Desert Southwest on Tuesday. Temperatures are forecast to range between the 80s and 90s from southern California to Arizona.

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