The Defiance Crescent News is reporting turnout was light for several of the counties in northwest Ohio. However, their methodology leaves a lot to be desired (total voters by 9 a.m.), so I wouldn't put too much credence in that.
The poll workers they quoted all seemed to be more in the "steady" to "pretty good" range, so I'd bet this region will crack the statewide average prediction of 25% by a good margin.
Chad, the Black Swamp Conservative, has already reported high turnout in the Archbold area, and Henry County (just south of Fulton) as a whole has plenty to draw out the voters: a countywide sales tax issue and four competitors for the GOP's commissioner slot.
All in all, primaries are almost always low turnout affairs driven more by local ballot issues than party races. As it turns out, the Northwest features school building levies, operating levies, income taxes, sales taxes and a wide variety of township, municipal and library issues, so I think the area will come out and vote.