Weather Underground midday recap for Tuesday, April 30, 2013.
Wet and unsettled weather waned in the East on Tuesday, while a strong cold front moved into the North-Central U.S. with much colder weather.
In the East, lingering upper level energy over the Eastern Seaboard 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 the early morning. This activity will tapered off later in the morning, becoming lighter and more isolated. Meanwhile, light to moderate showers and isolated thunderstorms continued in the southern stream of this system along the Gulf Coast.
To the north, upper level energy over the Upper Midwest and associated low pressure system lifted northeastward toward Ontario on Tuesday. As the system progressed an associated a strong cold front reached from the Upper Midwest and southward across the Central Great Basin by Tuesday evening. Showers, areas of heavy rain, and thunderstorms continued from parts of Michigan and Wisconsin through eastern Iowa through Tuesday morning. Morning storms in Michigan had the potential to produce small hail. Areas from centralWisconsin through Iowa and into northern Kansas were at slight risk of severe thunderstorm development from the late afternoon through early Tuesday night. While large hail events were the main concerns with severe weather development in this region, isolated strong to damaging wind gusts were not ruled out. Behind this activity, areas of moderate to heavy snow were also expected over the Northern and Central Rockies into the High Plains. Strong, gusty northwest winds followed the cold front and ushered a much colder airmass into the northwestern quadrant of the nation. Many areas saw well below normal daytime highs for this time of year.
Temperatures in the Lower 48 states Tuesday have ranged from a morning low of 16 degrees at Yellowstone, Wyo. to a midday high of 99 degrees at Needles, Calif.