Strong to severe storms possible Tuesday afternoon

A strong low pressure system will lift into the upper Great Lakes later this afternoon with a cold front trailing behind.  Storms have already started to develop just east/southeast of Des Moines, IA along the front but also in an area with better moisture and warmth.  They'll likely weaken some as they run into a drier, cooler air mass across eastern Iowa. 

There is a lot of dry air behind the front in the upper levels of the atmosphere and this may actually help storms fire back up going into the afternoon.  Strong south/southwest winds will help pull moisture northward ahead of the cold front later today, but since the main low will remain well north of area widespread severe weather is not anticipated.  Current indications are suggesting isolated thunderstorms will develop late afternoon (roughly between 3pm-9pm) across sections of Missouri and Illinois and move east.  Should storms develop, instability may be just enough to support individual, isolated storms capable of producing damaging hail as well as damaging winds.