The current rain event not related to Hurricane Ike will move out late Saturday only to be replaced by the remnants of Hurricane Ike Sunday. This storm will take a track similiar to Gustav from almost two weeks ago. The likely heavy rain will be SE of the state but like with Gustav, rain will occur most likely in eastern Iowa east of a Prairie Du Chien Wisconsin to Lamoni line.
Here is the link to the 18Z GFDL Model Run for 1pm Sunday.
GFDL 1pm Sunday

Ike is expected to make landfall around midnight near Galveston TX as a Cat 3 Hurricane.