Thursday, August 27th 2009 Weather Outlook

26 08 2009

Thursday’s Weather Outlook; Plains/Mississippi Valley/Great Lakes/Ohio Valley System, Tropical Storm Danny, Midwest/Great Lakes System

12:15AM

On Thursday, a system will continue to slowly work est across the Ohio Valley into the Plains, while a new system pushes intot he Midwest and Tropical Storm Danny affects the Southeast. Showers and storms will be likely in portions of the Southeast, as moisture pushes onshore, associated with Tropical Storm Danny whcih will be working through the north side of the Bahamas. With high moisture content, heavy rainfall may be possible. A few storms may also become severe. As CAPE values will be around 1500 J/KG, LI’s of -4 and Effective Bulk Shear values up to 25KT. Limited shear, forcing and instibility will limit the overall coverage and severe potential. The main threats from any storms that become severe, will be damaging winds and hail. In the Midwest, a new system will push in from Southern Canada. Showers and storms will be likely in portions of the Midwest and Great Lakes, associated with this system. A few storms may become severe. As CAPE values will be around 1000 J/KG, LI’s of -3 and Effective Bulk Shear values up to 35KT. Limited shear, forcing and instibility will limit the overall coverage and severe potential. The main threats from any storms that become severe, will be damaging winds and hail. Another system will continue to slowly push through the Ohio valley back into the Plains. Showers and storms will be lickley across portions of the Ohio Valley, Plains and Mississippi Valley, associated with this system. High moisture content near the frotn will provide a heavy rain and floodign potential. A few storms may become severe near the cold front in portions of the Mississippi Valley and Plains. As CAPE values will be around 2500 J/KG, LI’s of -5 and Effective Bulk Shear values uo to 35KT. Limited shear and forcing will limit the overall coverage and severe potential. Which will preclude a slight risk from being issued. The main threats from any storms that become severe, will be damaging winds and hail. Below is the thunderstorm outlook for Thursday.

sev 628


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