
4/17/25 - Warmer and wetter; How much would you bet that we've seen our last frost?
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The episode covers current severe storm risk, a warm/wet outlook, lingering (but mostly localized) frost potential, and advice for growers on weather impacts, pest and seedling management, and fieldwork timing. There’s a focus on using sound data (not just forecasts) for planting decisions, and corrections on frost hardiness for strawberry crops. Weather Recap & Outlook
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The hosts recall a historic severe weather event: an F3 tornado in Van Buren County on April 16th, 1967.
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For the current day (April 17, 2025), the main severe weather threat is large hail (1–2+ inches), especially from Omaha through Des Moines and Ames; tornado risk is low due to low dew points.
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Forecast: Severe storms possible overnight. Friday and Saturday expected to be pleasant, with more rain chances from Saturday night into Sunday. Rainfall of 0.75–1.25 inches possible across the state.
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Eastern Iowa, especially between Waterloo and Cedar Rapids (D1 drought area), is currently receiving needed rain.
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The 6–10 and 8–14 day forecasts show a warm and wet signal, especially in southwestern Iowa. The month-ahead and seasonal outlooks are less certain, with possible slightly increased warmth and dryness moving into early summer.
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Despite a strong signal for above-normal temperatures, the last frost of the season may not have occurred yet, especially in central and northern Iowa.
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Widespread frost is unlikely, but localized events could still occur, especially in valleys or low-lying, dry areas.
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Soil temperatures are fluctuating widely due to dry soils, with values expected mostly in the low/mid 60s to mid 40s over coming weeks. Some forecasts show soil temps as low as 42°F in northern Iowa by early May.
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Growers are advised not to rush warm-season crops like tomatoes and peppers into the field before mid-May or early June, due to risk of cold soil and air temperatures.
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It’s been windier than usual, which is notable particularly in northwest Iowa.
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Cloud cover and cooler temps have persisted in eastern Iowa, verified by grower feedback.
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Accumulation of growing degree days is ahead of normal, prompting early alfalfa weevil egg hatch in southern Iowa.
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Some growers are experimenting with blackening cover crops to encourage warmer soils for earlier sweet corn, but cloudy weather has limited the benefits.
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Problems with bean germination in greenhouse trays may be linked to seed maggots and/or sensitive response to high nutrient salt levels in potting media. Microclimate and possible ammonia burn are additional considerations.
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Growers are advised to bioassay suspect potting media using sensitive crops like beans and peas.
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The host corrects a previous statement: Strawberry flower buds are hardy to 20°F; open blossoms are damaged in the high 20s.
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With wetter weather on the horizon, growers are encouraged to finish field prep and tillage now, before rain delays field access and results in transplants outgrowing their cells.
*Podcast transcript and summary provided using AI