『8/21/25 - Cooler and Drier on the way...Warm fall?』のカバーアート

8/21/25 - Cooler and Drier on the way...Warm fall?

8/21/25 - Cooler and Drier on the way...Warm fall?

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What in the Weather? - August 21, 2025 Episode Summary Weather Discussion
  • Historic perspective: August 21, 2004 saw unusually cool temps (upper 30s) in northern Iowa - opposite of current conditions
  • Hot summer analysis: July averaged 2°F above normal with exceptional humidity (85% of days had above-average dew points)
  • Heat index impact: Triple-digit heat index values driven more by high dew points (upper 70s-low 80s) than air temperatures
  • Moisture source: Gulf moisture "gate wide open" with southerly winds bringing exceptional humidity to upper Midwest
Forecast
  • Weekend cooldown: Dramatic temperature drop to highs in 70s, overnight lows in upper 40s-mid 50s
  • Extended outlook: Southeastern Iowa likely colder late August, September outlook shows warm/dry trend
  • Precipitation: Minimal rainfall expected (0.1-0.25") with best chance Friday night into Saturday
  • La Niña watch: Potential fall development could affect late October/November weather patterns
Specialty Crop Impacts
  • Disease issues: Rhizoctonia root rot affecting snapdragons; tomato brown rugose fruit virus causing uneven ripening
  • Pest spotlight: European corn borer infesting dahlia stems and peppers - biological control with Trichogramma wasps recommended
  • Growing challenges: Excessive moisture limiting planting windows; late-planted fall crops struggling to establish
  • Crop performance: Good pepper year for some growers, but eggplant and tomato fruit set suffering from heat stress
Resources
  • Penn State cut flower production newsletter
  • Utah State University cut flower resources
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