Mostly dry weather dominated the Plains, upper Midwest, and Northwest, promoting summer crop maturation and harvesting. Winter wheat planting also quickly advanced, except on the drought-stricken southern Plains, where many producers opted to postpone seeding operations while awaiting rain.
In addition to the dry weather, parts of the upper Midwest - including North Dakota and Minnesota - experienced a growing season-ending freeze on September 15. Only a small percentage of the corn and soybeans in the freeze-affected area was fully mature when the freeze struck, possibly
reducing yield potential.
Meanwhile, wet weather prevailed along and east of a line from Louisiana to Indiana. Some of the heavy rain, especially early in the month, was due to the remnants of Tropical Storm Lee, interacting with a cold front. Lee made landfall along the Louisiana coast on September 4.
Across the eastern Corn Belt, where September wetness hampered early-season harvest efforts, crops were already late in maturing due to spring planting delays. Farther east, back-to-back tropical deluges (from Hurricane Irene in late August and Tropical Storm Lee in early September) led to record flooding in parts of the Mid-Atlantic States. Elsewhere, scattered showers accompanied late-season warmth in the Southwest.
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