GrainTALK Webinar Spring Weather Outlook: Signals, Surprises, and What to Watch For

Why It Matters

A strong El Niña and an active Bermuda High could reshape moisture and temperature patterns across Ontario, directly impacting planting schedules, disease risk, and overall crop profitability for the 2026 season.

Key Takeaways

• El Niño expected to strengthen, potentially exceeding 2°C anomaly.
• Long‑range models show improving accuracy, but 7‑day forecasts remain best.
• Great Lakes moderate temperatures but do not intensify spring thunderstorms.
• Full moon myth debunked; clear skies drive frost risk.
• Bermuda High will bring humid, wet start to April.

Summary

The Grain Farmers of Ontario webinar centered on the 2026 spring weather outlook, emphasizing how evolving climate patterns—particularly the transition from La Niña to a potentially strong El Niña—will shape Ontario’s planting season. Presenter Aaron Brenner highlighted long‑range model improvements, noting three‑day forecasts now exceed 90 % accuracy while seven‑day outlooks remain the most reliable for agronomic decisions. He dissected common misconceptions, debunking the full‑moon frost myth and clarifying the Great Lakes’ limited role in spring thunderstorm intensity, while stressing their temperature‑moderating effect. Brenner cited Eric Sniggrass’s ag‑rx platform as his primary data source, explaining the blend of European (ECMWF) and North American (GFS) models that converge at longer lead times. He warned that a strong El Niña—projected to push sea‑surface temperatures 2.4 °C above average—could shift the polar jet stream northward, delivering warmer, moister air and increasing April precipitation. The Bermuda High, a persistent high‑pressure system, is expected to funnel humid air into the region, setting the stage for a wet early‑spring. Notable moments included Brenner’s anecdote about tracking a hurricane in Florida and his colorful description of his “chief morale officer” border collie, Antler, underscoring his hands‑on approach. He also referenced historical El Niño events, noting the last comparable anomaly occurred in 2015, and highlighted that past super‑El Niños often coincided with drier conditions, a nuance that could affect crop‑water management. For Ontario growers, the outlook signals a need to adjust planting windows, prioritize soil‑moisture monitoring, and consider varietal selections tolerant of higher humidity and potential early‑season rain. Anticipating a humid April, agribusinesses should prepare for increased disease pressure and evaluate drainage infrastructure to mitigate yield‑loss risks.

Original Description

With Aaron Breimer, CCA-ON.

Aaron discusses trends in Ontario, how weather can influence crops agronomically, and what to watch for in the field as various weather patterns influence crops, disease, and insects.