Thursday, June 25th 2009 Weather Outlook

Thursday’s Weather Outlook; Great Lakes/Ohio Valley/Northeast System, West/Plains System

12:00PM

On Thursday, a system will push through the Great Lakes, while a system pushes through the West. Showers and storms will be likely over portions of the Great Lakes, Ohio Valley and Northeast. There is a slight risk for severe storms over portions of Michigan, Indiana, Ohio, Kentucky, West Virginia, Pennsylvania and New York. CAPE values will be around 3500 J/KG, LI’s of -9 and Effective Bulk Shear values of 20-55KT. This along with a system pushing through will help storms become severe. Severe storms will develop in the Afternoon from Michigan through Ohio and up into New York. These storms will push eastward through the day and into the Evening, before weakening as diurnal cooling sets in. Further west across portions of Iowa, Wisconsin, Missouri and Illinois, the lack of shear and convergence will preclude a slight risk from being issued. The main threats from the severe storms will be damaging winds, hial and an isoalted tornado. Across the Gulf Coast, afternoon pop up showers and storms will be likely. These storms will diminish during the evening, as diurnal cooling sets in. In the West, a system will push through the region. Showers and storms will be likely in portions of the West and Plains associated with this system. There is a slight risk for severe storms in portions of Montana, Wyoming, Colorado, South Dakota, North Dakota, Nebraska and Kansas. CAPE values will be around 2500 J/KG, LI’s of -7 and Effective Bulk Shear values of 30-65KT. This alogn with the system in the area, will help storms become severe. Severe storms will develop in the Afternoon from Montana down through the Dakotas and into Colorado and Kansas. these storms will push eastward into the Evening. Storms may then form into an MCS over portions of Colorado, Nebraska and Kansas, which will push eastward overnight as it weakens. The main threats from the severe storms will be damaging winds, hail and an isolated tornado. Below is the severe weather outlook for Thursday.