Weather Underground Forecast for Tuesday, April 30, 2013.
Wet and unsettled weather will wind down on Tuesday, while a strong cold front moves into the North-Central U.S. with much colder weather.
In the East, lingering upper level energy over the Eastern will maintain areas of heavy coastal rain and light to moderate scattered showers and isolated thunderstorms for the Mid-Atlantic and light scattered showers in southern New England through Tuesday morning. This activity will wane through the day, becoming lighter and more isolated in nature. By Tuesday evening, light to moderate showers are expected to linger for areas of the North Carolina coast northward through the southern areas of New Jersey and Pennsylvania as a trough of low pressure sits off the coast of the Carolinas. Meanwhile, light to moderate showers and isolated thunderstorm in the southern stream of this system along the Gulf Coast are also expected to wind down on Tuesday.
To the north, upper level energy will linger over the Upper Midwest on Tuesday, allowing showers to continue from parts of Michigan and Wisconsin through eastern Iowa through Tuesday morning. Behind this activity, a strong cold front dropping across the Northwest will advance eastward into the Upper Midwest and southward across the Central Great Basin by Tuesday evening. This storm will produce moderate to heavy snow over the Northern and Central Rockies into the High Plains, while showers and thunderstorms advance eastward with this disturbance and reach from The Upper Great Lakes into the Central Plains by Tuesday evening. Strong, gusty northwest winds will follow the cold front, ushering a much colder airmass into the northwestern quadrant of the nation. Many areas will see well below normal daytime highs for this time of year as temperatures for much of the area are expected to climb into the 30s and 40s.
Temperatures in the Lower 48 states Monday have ranged from a morning low of 23 degrees at Pinedale, Wyo. to a high of 100 degrees at Thermal, Calif.