University of Missouri Extension warned that intense or repeated rain could flood corn and soybean fields. Parts of southern Missouri received 25 to 30 inches of precipitation so far this year, and 3 to 5 inches fell in the first half of May.
Waterlogged soils are more damaging in clay-heavy soils, and corn is more sensitive to flooding than soybeans.
Flooding risk in parts of the Missouri crop area could cut stands and require replanting. It is a localized risk that adds modest upside to corn prices if it spreads.
After 1,465 past bullish weather events, CORN moved a median +0.2% over 5 sessions (54% higher; middle half -1.4% to +1.9%), and +0.9% over 20.
After 324 past neutral weather events, SOY moved a median +0.0% over 5 sessions (52% higher; middle half -1.4% to +1.7%), and +0.7% 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.