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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