USDA officials said a computer weighting issue caused an error in September corn yield estimates, mainly affecting Kansas and Nebraska. Correcting it raised the national estimate by 0.3 bushel per acre to 178.8; officials said the October forecast of a record 181.2 bushels per acre was validated and unaffected.
Clarifying the error may help restore confidence in USDA data, but the correction itself made only a small change to the national corn estimate. The October record forecast remains intact, keeping the supply outlook ample and potentially weighing on corn prices.
After 1,102 past bearish report events, Corn moved a median -0.2% over 5 sessions (47% higher; middle half -1.8% to +1.3%), and +0.0% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.