『What in the Weather?』のカバーアート

What in the Weather?

What in the Weather?

著者： Dan Fillius; Justin Glisan
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 This one's for you if you want to understand weather better! Join Dan Fillius, Iowa State University Extension Horticulture Field Specialist, and Dr. Justin Glisan, Iowa’s State Climatologist, as they discuss what is happening in the world of Iowa weather. Every week during the main growing season we'll discuss recent weather, its impacts on fruits and vegetables, and provide a climate outlook for the coming week in Iowa. Let us know what you think, though as Mark Twain once said, "If you don't like the weather, wait a few minutes."2023 博物学 生物科学 科学 自然・生態学
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  • 7/31/25 - Corn Sweat with Dr. Justin "Soybean Glistens"

    7/31/25 - Corn Sweat with Dr. Justin "Soybean Glistens"
    2025/07/31
    Main Topic: "Corn Sweat" Phenomenon
    • Definition & Media Coverage
      • "Corn sweat" is simply a catchy term for evapotranspiration
      • Justin Glisan was interviewed by major news outlets (Washington Post, CNN, USA Today, CBS)
      • The phenomenon was trending during the hottest week of July 2025 during a heat dome
    • Scientific Reality
      • Corn releases water vapor and oxygen through transpiration (not actually "sweating")
      • Adds 3-5% to relative humidity locally (3-5 degrees to dew point)
      • Peak evapotranspiration occurs during corn pollination/tasseling season
      • Iowa has 13 million acres of corn contributing to this effect
    • Comparative Analysis
      • Prairie grasses actually have slightly higher evapotranspiration rates than corn
      • Corn and soybeans have very similar ET rates during peak growth
      • Historical prairie landscape would have different hydrology and soil structure
      • Modeling is used to understand these complex comparisons since full-scale experiments aren't feasible
    • Weather Forecasting History
      • First tornado warning issued in 1940s by Miller and Fawbush at Air Force base
      • WWII and 1946 weather radar development improved forecasting capabilities
      • 1925 Tri-State tornado killed ~700 people despite warning signs, but no communication system existed
      • Modern forecasting balances accuracy with avoiding "boy who cried wolf" scenario
    • Social Media & Public Education
      • Madelynn Wuestenberg urges people to stop sharing corn sweat TikToks
      • Working on program to fact-check weather-related social media content
      • Emphasizes need for agricultural meteorologists with both meteorology and agronomy backgrounds

    Summary generated by Claude.ai
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    24 分
  • 7/24/25 - Temperatures moderating, Wetness continues

    7/24/25 - Temperatures moderating, Wetness continues
    2025/07/24
    Historical Weather (This Day in History - 1993) Severe thunderstorms moved from Nebraska to western Iowa at 60 mphWind gusts exceeded 70 mph, with 75 mph winds in Pottawattamie County destroying barnsCouncil Bluffs received 2 inches of rain in 30 minutes causing urban floodingDes Moines recorded 83 mph wind gust1993 was record wet year for Ames (20 inches of rain in July alone vs. 8 inches in July 2025) Current Weather Forecast Short-term (Justin Glisan) Rainfall chances continue through Friday nightCold front broke heat dome, bringing dew points downTemperatures: mid-80s through weekend, then back to 90sMinor rainfall chances early next weekNorthern Iowa has less rain chance as storm track moves southExpected rainfall: 3/4 inch statewide (below normal), 1.5-2 inches in southwestern Iowa Extended Outlook (Madelynn Wuestenberg) 6-10 day outlook (July 29-Aug 2): Slightly below normal temperatures in north, near normal in south; 33-40% chance above normal precipitation8-14 day outlook (July 31-Aug 6): Continued slight chances of below normal temperatures; western Iowa slightly wetter, eastern Iowa near normalNormal temperatures: Daily highs mid-80s, lows in 60s Recent Weather Events Heat and Humidity Yesterday and prior day were hot, with cloud cover mitigating worst conditions in central IowaEastern Iowa experienced "dew point pooling" with dew points in upper 70s-low 80sHottest reading: Dubuque Lock and Dam hit 95°F with heat index of 110°F Severe Weather 6 AM tornado warnings in central IowaTornado warnings near Maxwell and eastern IowaCaused by remnants of mesoscale convective vortex from Kansas moving along warm boundary Rainfall Totals (Past 7 Days) Northeast Iowa: 4-4.5 inches (highest)Central Iowa: 3-3.5 inchesSouthwest Iowa: Trace to 0.25 inches (lowest, drought conditions persist) Specialty Crop Impacts Garlic Disease Investigation Farm in Chariton, Iowa had garlic crop with yellowing (suspected aster yellows)Testing revealed it was a virus, not aster yellows phytoplasmaCannot save seed for next year due to virusComparison with aunt's clean stock showed dramatic differenceAt a different farm, possible Embellisia skin blotch observed on garlic wrappers Brassica Issues Black rot & alternaria affecting collards, broccoli, and kaleWet conditions exacerbating disease problems Nutritional Concerns Nitrogen leaching due to excessive moistureFertilization may be necessary to supplement leached nutrients Crop Performance Issues Onions in Central Minnesota: Unexpectedly bolting across all varieties (planted from seed this spring) Zucchini: Poor fruit set, currently "worst crop of the year" candidate Tomatoes: Slow growth, fruit remaining greenGeneral pollination: Poor across multiple crops due to hot, wet conditionsHeat may be affecting fruit set in tomatoes and peppers (flower abortion) Upcoming Events July 30: Cut flower field walk at River Root Farm (Decorah)July 31-Aug 1: Plant Peddler educator field day and variety day (Cresco)August 2: Grow Johnson County field day and food safety workshopAugust 5: Iowa State fruit and vegetable Field DayAugust 20: Midwest mechanical weed control field day Show Notes Hiatus announcement: No new episodes for 3 weeks (pre-recorded content only)Return date: August 21st, 2025 summary generated using Claude.ai
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    21 分
  • 7/17/25 - Hot next week; Wet conditions continue

    7/17/25 - Hot next week; Wet conditions continue
    2025/07/17
    Weather History On July 17, 1972, slow-moving morning thunderstorms dropped 5.5 inches of rain at Sioux City, setting the all-time daily rainfall record there (still standing). Other highlights: 4.63 inches at Sac City, 3.45 inches at Humboldt. Short-Term Weather Outlook Cool air has returned after a recent frontal passage, but temperatures are forecast to increase again heading into next week. There are chances for showers and thunderstorms through the weekend. A “Ring of Fire” storm pattern will set up as a heat dome builds south over Missouri, leading to more storms along its northern edge (ridge riders/squall lines), likely north of Iowa, affecting the Upper Midwest (ND, SD, MN, WI). Medium-Range Weather Setup The bullseye of the heat dome appears over Missouri July 22–26; during this time, Iowa will see a precipitation gradient, with most rain favored in northeast Iowa. Precipitation forecast is variable, and storm placement will become clearer closer to each event. Southeast Iowa (and previously drier northern counties) have recently received significant rainfall, shifting them from "have-nots" to "haves." Ottumwa remains in moderate drought ("D1") as a stubborn dry spot. Climate Outlook 6–10 and 8–14 day forecasts show high probabilities for above-normal warmth (especially south), then continued wetness through late July. The 3–4 week outlook through August 8 gives no clear signal on temperatures, with a slight lean toward dryness in southwestern Iowa. Initial August outlooks show “equal chances” for temperature and precipitation over southern and central Iowa, a result of persistent widespread soil moisture which helps moderate heat. Atmospheric Impacts Recent wetness tamps down temperature extremes due to moist soils and increased cloud cover. The area’s high dew points indicate low atmospheric demand, reducing drought risk but potentially increasing plant disease issues. Past Week's Weather Severe weather last Friday produced two weak tornadoes in southern and eastern Iowa, with no widespread damage. Wildfire smoke from Canada arrived over the weekend after a strong cold front and wind shift to northwesterly flow. Wet conditions continued across much of the state. Specialty Crop Impacts Foliar Disease Risk Prolonged wet conditions are increasing foliar disease risks in specialty crops. Preventive fungicide programs are recommended for conventional growers, especially on brassicas (cabbage, broccoli, cauliflower). Summary of biopesticide efficacy for brassica diseases (per Meg McGrath, Cornell University): For black rot: Oxidate worked in 1 of 1 trial, Regalia in 1 of 2, copper in 4 of 5, Double Nickel in 1 of 1. For alternaria: copper is most effective. Over-use of copper risks resistance and soil accumulation; organic certification requires soil copper testing before use. For basil downy mildew: Only resistant varieties (notably the Prospera series) provide reliable control—fungicides are not effective. For powdery mildew on pumpkins and squash: Use potassium bicarbonate products like Kaligreen or Milstop (these are safer than baking soda due to plant salt sensitivity). Disease and Cost Monitoring Meg McGrath's cost-per-acre chart helps growers compare costs of biopesticides and fungicides Beet and Swiss Chard Disease Cercospora leaf spot is appearing on beet and Swiss chard leaves, making chard unmarketable. Resistant varieties like Char Bell are advised for chard. Japanese Beetle Management Listener asked about Milky Spore for Japanese beetle grub control. Dan cautions little evidence supports its effectiveness and prefers pest exclusion over soil treatments, since beetles migrate from other areas. Pheromone traps may attract more beetles than they catch—sometimes best given to neighbors to ward beetles away from your crops. Colorado Potato Beetle Resistance The second generation of Colorado potato beetle larvae has emerged. Rotate insecticide chemistries to avoid resistance (e.g., use Azera in the second generation if spinosad was used in the first). Non-chemical methods, like knocking beetles into a soapy water bucket, remain effective—plants tolerate up to ~33% defoliation before yield loss. Announcements and Events The Fruit and Vegetable Field Day at Iowa State University’s Horticulture Research Station will be held August 5th, 2:00–5:30 PM (free, with supper and registration link provided). The Plant Peddler "Educate the Educators" Day is July 31st in Cresco, with a feast and entertainment; the next day is Variety Day showcasing mature bedding plants (trade show only, not for sale). Practical Farmers of Iowa opened applications for the horticulture program coordinator position. Podcast summary generated using perplexity.ai
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    24 分
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