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Weather Underground Forecast for Tuesday, April 15, 2014
A cold frontal boundary will shift eastward over the eastern third of the country on Tuesday, while a separate cold front will move across the Pacific Northwest.
A cold front is forecast to extend from the Florida Panhandle to New England on Tuesday. A cold air mass behind the frontal boundary will interact with a warm, muggy air mass ahead of the front to produce a line of showers and thunderstorms. Stormy weather is expected across most of the East Coast, while severe thunderstorms will be possible along the Mid-Atlantic coast. As cold air invades the northern tier of the country, a mixture of rain and snow will develop over the upper Midwest, the Ohio Valley and the Northeast. This system will also bring a chance of flash floods to eastern New York and eastern Pennsylvania.
A cold air mass behind the frontal boundary is expected to linger across the central third of the country, as temperatures are forecast to be 20 to 30 degrees below normal. Conditions will stay mostly clear across the Plains and the Midwest throughout the day.
Meanwhile, an area of low pressure will trek eastward across the Pacific Northwest, the Intermountain West and the northern Plains on Tuesday. During the morning, rain will be possible over Washington, Oregon and Idaho, while high elevation snow showers are expected across the Rockies during the afternoon and evening. This system will bring a chance of mixed precipitation to the northern Plains late in the evening. High pressure will keep conditions clear across the Southwest. Temperatures are forecast to range between the 80s and 90s across the southern California and Arizona deserts.
Temperatures in the Lower 48 states Monday have ranged from a morning low of -7 degrees at Yellowstone, Wyo. to a high of 89 degrees at Kendall, Fla.
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