Monday, December 14th 2009 Weather Outlook

13 12 2009

Monday’s Weather Outlook; Great Lakes/Gulf Coast System, Northwest System

On Monday, a system will push through the Great Lakes, while a system pushes into the Northwest. Snow will be likely along and north of the track of a system pushing through the Great Lakes. Accumulations are likely, with up to 6″ being possible in some areas. Furhter south along the cold front from this system, showers and storms will be likely along the Gulf Coast. A few storms may become severe along the Gulf Coast. Cape values will be around 500 J/KG, LI’s of -3 and Effective Bulk Shear values up to 50KT. Weak forcing and instibility will limit the overall threat. The main threats from any storms that become severe, will be damaging winds and hail. In the Northwest, a new system will push into the region. Rain will be likely in the lower elevations, with accumulating snow being likely in much of the interior, Cascades, and Rockies. Below are the thunderstorm and snowfall outlooks for Monday.

December 13-14th 2009 Plains/Midwest/Great Lakes Winter Storm

13 12 2009

Sunday-Monday, Plains/Midwest/Great Lakes Winter Storm

A weak system will eject into the Plains from the West on Sunday. this system will quickly push through the Midwest and Great Lakes by Monday. Precipitation will be confined to the cold side of this system, as moisture will be limited. A swath of accumulating snow will be likely on the north side of the system from South Dakota, eastward through Minnesota, and into Minnesota. A general 1-3″ can be expected in this corridor, with a band of 3-6″ being possible. Below is the snowfall map for this system.