Weather Underground midday recap for Tuesday, April 02, 2013.
Cooler and drier weather returned to the East on Tuesday, while energy ejecting out of the Rockies moved into the Southern Plains with unsettled weather conditions.
In the East, an upper trough of low pressure reaching across the eastern half of the nation continued to usher a cold airmass from the North into the Central and Eastern U.S. on Tuesday. This translated into another day of below normal temperatures that were about 10 to 20 degrees shy of normal temperatures for this time of year in portions of the Midwest, Northeast, and Mid-Atlantic. As cold northwesterly flow spread across the region, light to moderate lake effect snow showers continued in immediate downwind areas of the Upper and Lower Great Lakes. Areas downwind of Lake Ontario were placed under a Lake Effect Snow Advisory as the region experienced about an inch of snow during the afternoon and anticipated 3 to 6 inches by Tuesday night. Outside of this area of precipitation, generally drier conditions developed across the rest of the Eastern U.S.
Meanwhile, behind this activity, waves of energy over the Central Great Basin tapped into moisture from the Gulf of Mexico while moving across the Rockies and into the Southern Plains on Tuesday. This setup combined with a colder airmass over the region enhanced instability and led to areas of widely scattered light to moderate rain showers and thunderstorms from the Southern High Plains into the Lower Mississippi Valley and the Ozarks. Areas of central and southern Texas remained at slight risk of severe weather development through Tuesday night with threats of severe hail and damaging wind gusts.
Elsewhere, high pressure provided drier and milder conditions to the West Coast States.
Temperatures in the Lower 48 states Tuesday have ranged from a morning low of -4 degrees at Cando, N.D. to a midday high of 86 degrees at Plant City, Fla.