Friday, June 26th 2009 Weather Outlook

Friday’s Weather Outlook; Northeast/Mid-Atlantic/Ohio Valley System, West/Plains System

12:00PM

On Friday, a system will push into the Northeast, while a system pushes into the Plains. Showers and storms will be likely across portions of the Northeast, Mid-Atlantic and Ohhio Valley, as a system pushes through the Northeast. There is a slight risk for severe storms in portions of Maine, New Hampshie, Vermont, New York, Rhode Island, Massachusetts, Conneticut, Pennsylvania, New Jersey, West Virginia, Deleware, Maryland and Virginia. CAPE values will be around 2500 J/KG, LI’s of -6 and Effective Bulk Shear values of 20-50KT. This along with the system in the regions, will help storms become severe. Severe storms will develop in the afternoon along the cold front from Maine down into Pennsylvania, in the form of supercells and bowing line segment. These storms will push eastward through the day, before pushing offshore or weakening as diurnal cooling sets in. The main threats from the severe storms will be damaging winds, hail and an isolated tornado. Further southwest, along the tail end of the cold front in the Ohio Valley, isolated severe storms will be likely. The lack of shear will limit the severe weather potential, and thus will preclude a slight risk from being issued. The main threats from any stroms that do become severe, will be damaging winds and hail. There is a slight risk for severe storms in portions of South Caorlina, North Carolina, Georiga and Florida. CAPE values will be around 2500 J/KG, LI’s of -7 and Effective Bulk Shear values up to 45KT. Severe storms will develop in the Afternoon from North Carolina down into Florida along the sea breeze and convergence boundary. These storms will push eastward through the day, before pushing offshore during the Evening. The main threats from the severe storms will be damaging winds, hail and an isolated tornado. In the West, a system will push eastward towards the Plains. Showers and storms will be likely over portions of the Waest and Plains associated with this system. There is a slight risk for severe storms in portions of North Dakota, South Dakota, Wyoming, Colorado, Nebraska, Kansas, Minnesota and Iowa. CAPE values will be around 4500 J/KG, LI’s of -13 and effective Bulk Shear values of 35-75KT. This along with a system in the region, will help storms become severe. Severe storms will develop in the Afternoon along the cold front from North Dakota down into Colorado, in the form of supercells and bowing line segments. These storms will psuh eastward into the Evening, storms may then from into one or more MCS’s from North Dakota down into Nebraska. The MCS(s) will continue to push eastward overnight with a severe threat. The main threats from the severe storms will be damaging winds, hail and some tornadoes. Across portions of the Inter-Mountain West, with limited instibility a few storms may become severe. With the main threats being hail and damaging winds. Below is the severe weather outlook for Friday.