Wednesday, December 23rd 2009 Weather Outlook

23 12 2009

Wednesday’s Weather Outlook; Northeast System, Rockies/Plains/Midwest/Mississippi Valley System

On Wednesday, a system will continue to affect the Northeast, while a system pushes through the Plains. Snow will be likely in portions of the Northeast, as a system continues to effect the area. Accumulations will be likely, with over 6″ being possible in Maine. In the Plains,a  system will push through the area. Showers and storms will be likely in portions of the Plains and Mississippi Valley. There is a slight risk for severe storms in portions of Texas, Louisiana, Oklahoma, Arkansas, Kansas, and Missouri. Strong forcing and dynamics along with Cape values up to 1500 J/Kg, LI’s up to -5, and Effective Shear values up to 60Kt, will aid in the development of severe storms across the risk area. The potential for severe storms will exist within an area of return flow across Eastern Texas and Western Louisiana, and ahead of the cold front in Central and Eastern Texas. The main threats from any storms that become severe will be damaging winds, hail, and an isolated tornado. Further north across portions of the Southern Midwest, freezing rain will be possible. Warm air aloft will preclude any frozen precipitation, but surface temperatures around freezing will allow rain to freeze on contact. The area at greatest risk for ice accural up to 0.75″ include portions of Kansas, Missouri, Nebraska, Iowa, Illinois, Indiana, Wisconsin, and Michigan. Winds over 25MPH combined with the ice, may cause power outages and tree damage. Further north, accumulating snow will be likely across the rest of the Midwest, Plains and Rockies. Accumulations over 6″ will be likely in many areas. Winds over 25MPH combined with the snow, may create blizzard conditions at times. Below are the severe weather and snow/ice outlooks for Wednesday.

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