Tuesday, September 8th 2009 Weather Outlook

7 09 2009

Tuesday’s Weather Outlook; Mid-Atlantic System, Ohio Valley/Mississippi Valley/Tennessee Valley System, West/Plains/Midwest System

11:15PM

On Tuesday, a system will continue to move along the East Coast, while a system ocntinue to sit ove rthe Ohio Valley and a system pushes through the Plains. Showers and storms will be lilel yin costal portions of the Mid-Atlantic, as a costal system continue to work its way up the coast. Showers and storms will be likely in portions of the Ohio Valley, Mississippi Valley and Tennessee Valley, as an upper level system continues to sit over the area. A few storms may become severe. As CAPE values will be aorund 2000 J/KG, LI’s of -5 and Effective Bulk Shear values p to 25KT. The lack of shear and forcing will limit the overall severe threat and coverage. The main threats from any storms that become severe will be damaging winds, hail and an isolated tornado. In the Plains, a system will continue to psh through the area. Showers and storms will be lilely in portions of the Midwest, Plains and Front Range, associated with this system. There is a slight risk for severe storms in portions of  North Dakota, South Dakota, Minnesota, Nebraska, Wyoming and Colorado. CAPE values will be around 3000 J/Kg, LI’s of -8 and Effective Bulk Shear values up to 55KT. Severe storms will develop during the Afternoon along and ahead of the cold front from North Dakota down into Southeast Wyoming and Northeast Colorado. These storms will push eastward into the Evening, before weakening through the Night as diurnal cooling sets in. The main threats from the severe storms will be hail, damaging winds and an isolated tornado. Further south ahead of the cold front and within an upsloap flow across portions of Colorado, New Mexico, Texas, Oklahoma and Kansas, a few storms may become severe. As CAPE values will be around 2500 J/KG, LI’s of -5 and Effective Bulk Shear values up to 35KT. Limited forcing and lower shear in this area will limit the overall severe threat and coverage. The main threats from any storms that become severe will be damaging winds, hail and an isolated tornado. Below is the severe weather outlook for Tuesday.

sev 641


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