Wheat CME immediate support is 633/632, but below here meets good support at 625/624 and a good chance of a bounce from here today. However longs need stops below 621 for 617/616 then a buying opportunity at this week's low of 611/610.
Above 636 is more positive and meets this week's high at 646. On a break higher today we run in to very strong resistance at from September, November and December lows at 654/655 this week.