This precipitation was fed by a low-level jet which carried warm, moist air near the surface from Texas and Oklahoma into the frontal region over Nebraska, South Dakota, and Iowa.

• 这次暴雨的水汽来源是依靠一支位于近地面层的南来的湿低空急流,它经由美国南方的得克萨斯州和沃克拉何玛州把暖湿空气输送到位于美国中西部的那不拉斯加州、南达可塔州和爱渥华州的锋区地区。