NSA Rule for a game that cannot be completed, is FIVE innings (or 4 and 1/2 if the home team is winning). It is NOT four innings as quoted above. It is unfortunate that the storm came through and caused damage to the dugouts and fields, it also put players, parents and coaches at risk. But, it did and the NSA rule book was followed. It would have been GREAT if the games could have been finished!!!
You can find the NSA rule on page 113 of the 2010 playing rules, it is rule 5 section 3 (g)