Saturday, June 27th 2009 Weather Oulook

Saturday’s Weather Outlook; Plains/Great Lakes/Mississippi valley System, Northeeast/Mid-Atlantic/Southeast System

12:00AM

On Saturday, a system will continue to push through the Northeast, while a system pushes through the Midwest. Showers and storms will be likely over portions o fthe Northeast, Mid-Atlantic and Southeast, as a system continues to push through the Northeast. along the cold front from the nrotheast down into the Southeast, CAPE values will be around 2500 J/KG, LI’s of -5 and Effective Bulk Shear values up to 45KT. Storms will develop in the Afternoon along and ahead of the cold front from the Northeast down into the Southeast and also on the backside of the system in the Interior Northeast, some of the storms may become severe. With the main threats being haila nd damaging winds. The main disturbance associated with this system will have moved offshore, this will limit the severe threat and preclude a slight risk from being issued. Another system will be pushing eastward across the Midwest. Showers and storms will be likely over portions of the Plains, Great Lakes and Mississippi Valley, associated with this system. There is a slight risk for severe storms in portions of Minnesota, Wisconsin, Illinois, Iowa, Missouri, Kansas, Oklahoma and Texas. CAPE values will be around 4500 J/KG, LI’s o f-9 and Effective Bulk Shear values of 20-60KT. This along with a system in the area, will help storms become severe. Severe storms will develop in the Afternoon along the cold front from Wisconsin down into Oklahoma, in the form of supercells and bowing line segments. These storsm will push eastward through the Evening, before weakening overnight as diurnal cooling sets in. The main threats from the severe storms will be damagingn winds, hail and a few tornadoes. On the backside of the system in North Dakota, South Dakota and Minnesota; CAPE values will be around 1500 J/KG, LI’s of -5 and Effective Bulk Shear values of 20-60KT. Storms will develop in the Afternoon, as colder air aloft works in behind the main system. Some of the stroms may become severe, with the main threats being hail, damaging winds and an isolated tornado. Below is the severe weather outlook for Saturday.