Takeaway

Record September precipitation driven by a historically strong El Niño has severely disrupted corn and soybean harvest operations across the Western Corn Belt, leading to acute standability, lodging, and crop quality degradation. While an upcoming 12-day dry window is forecast, severe ground saturation and disease risks—such as aflatoxin—threaten both yield realization and commercial grain quality.

What the presenter said

• [00:00] Areas of Iowa experienced record-setting rainfall throughout September.
• [00:15] Broad swaths of the Western Corn Belt received record rainfall over the past month due to El Niño-driven weather patterns.
• [00:23] Severe harvest delays are underway, with fields requiring an estimated 6 to 9 days to dry out once precipitation stops.
• [00:30] Excess moisture is causing standability problems, heightening disease pressure that cuts yields, and creating quality issues in both corn and soybeans.
• [00:37] Tropical moisture incursions of this nature are highly unusual for the Western and Northern Corn Belt.
• [00:44] The record daily rainfalls stemmed from the remnants of Tropical Storm Polo merging with a Pacific low from California.
• [00:57] Lincoln, Nebraska, recorded an isolated total of 10 inches of rain.
• [01:01] The current El Niño ranks among the strongest on record, already eclipsing levels seen in 2015.
• [01:12] September ranked as one of the wettest on record for Des Moines (12.67 inches) and Waterloo (9.5 inches).
• [01:20] Portions of Iowa and Nebraska received roughly 90% of their typical annual precipitation during August and September alone.
• [01:27] Specific localized areas in Iowa accumulated between 20 and 30 inches of rainfall across August and September.
• [01:37] Central Ohio experienced its wettest finish to a growing season on record.
• [01:43] Soybean harvest progress is lagging significantly, sitting 14% behind normal in Iowa and 12% behind normal in Nebraska.
• [01:54] Premature sprouting is occurring in both corn and soybeans, alongside corn aflatoxin outbreaks that are causing truckloads to be rejected at delivery points.
• [02:12] Extended meteorological models indicate an approximate 12-day dry spell ahead to help saturated soils drain.
• [02:24] Harvest conditions will remain extremely difficult due to high soil moisture, severely lodged soybeans, and deteriorated corn stalks.
• [02:33] Regions that took on record precipitation and standing floodwaters will need extended drying periods before combines can safely enter fields.

Trade ideas

None stated. The presenter did not put forward specific futures or options trade recommendations, focusing entirely on the logistical, yield, and quality impacts of the weather disruptions across the Western Corn Belt.

Levels and data cited

• Precipitation Totals (IEM Estimates):
  • Lincoln, Nebraska: 10 inches (period: 25 Sep 2026 – 1 Oct 2026).
  • Des Moines, Iowa: 12.67 inches in September (period: 31 Aug 2026 – 1 Oct 2026).
  • Waterloo, Iowa: 9.5 inches in September (period: 31 Aug 2026 – 1 Oct 2026).
  • Isolated Iowa locations: 20 to 30 inches combined (period: 31 Jul 2026 – 1 Oct 2026).
  • Iowa & Nebraska: 90% of annual rainfall received across August and September (period: 31 Jul 2026 – 1 Oct 2026).
• Harvest Progress:
  • Iowa soybean harvest: 14% behind historical normal.
  • Nebraska soybean harvest: 12% behind historical normal.

Risks and what would invalidate this

• Harvest Delays & Inaccessibility: Prolonged soil saturation and localized flooding preventing field operations beyond the projected drying window.
• Agronomic Deterioration: Widespread lodging in soybeans and compromised corn stalk integrity causing harvest loss.
• Quality & Commercial Discounts: Proliferation of mycotoxins (e.g., aflatoxin in corn) and in-pod/on-ear sprouting leading to elevator delivery rejections and yield write-downs.