We used Hurricane Ike as our analog, Jeff Masters uses Gustav.
From Wunderblog:
Figure 4. Track of Hurricane Gustav of 2008, which followed a path very similar to that of Isaac's predicted path.
While rain would not help this year's corn crop it would at least start recharging the soil.
If Isaac doesn't track over the hardest hit areas of the country, Arkansas, Missouri, Indiana and Kentucky, could be facing a multi-year drought.
