Hot and humid weather will prevail Friday, as thunderstorms redevelop Friday afternoon and evening ahead of a slow moving front across Iowa. Some of the storms may become severe , with the primary threats being from damaging winds and large hail, along with the potential for heavy rainfall. It will remain hot and humid through the weekend  with isolated to scattered thunderstorms possible each day.
Elsewhere in across the Corn Belt, very warm, mostly dry weather and abundant moisture reserves are maintaining nearly ideal conditions for summer crop development, although lowland flooding  persists in portions of the southern and western Corn Belt.
On the Plains, abundant moisture reserves  are found from Montana into the Dakotas. Across the southern half of the Plains, warm, dry weather favors winter wheat maturation and harvesting, although lowland flooding persists in a few areas.
In the South, hot weather  continues to promote rapid crop development, although heat remains stressful for reproductive summer crops such as silking corn. One-third to two-thirds of the corn crop was silking in Alabama, Arkansas, Georgia, Mississippi, Texas, and the Carolinas.
In the West, unusually cool weather continues to limit Northwestern crop development.