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."

What in the Weather?
Claim This Podcastby Dan Fillius; Justin Glisan; Madelynn Wuestenberg
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Podcast Overview
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."
Language
🇺🇲
Publishing Since
4/12/2023
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Recent Episodes

July 8, 2026
7/8/26 - Staying Hot, Drying Out
<p>It's Swass season, y'all.</p> <p><strong>00:00:49</strong> – This Day in Iowa Weather History: the 1984 temperature swing from 35°F frost at Elkader to 100°F at Shenandoah in 24 hours</p> <p><strong>01:19</strong> – Weekly trivia question introduced: what's Iowa's record 24-hour precipitation total?</p> <p><strong>03:15</strong> – Weather forecast headline: slight severe storm risk overnight, hot and mostly dry week ahead with highs in the low-to-mid 90s</p> <p><strong>04:12</strong> – Extended climate outlook: hot and dry pattern dominates 6-10 day, and 8-14 day outlooks, with a Level 3 heat risk for northwest/western Iowa July 10-14</p> <p><strong>08:41</strong> – Past week's weather recap: multiple tornado reports, wind/hail damage, and significant flash flooding over the July 4th weekend</p> <p><strong>11:09</strong> – Breakdown of extreme rainfall totals from the holiday weekend, including a 12+ inch radar-estimated total near Elkhart and a 10.99" official CoCoRaHS reading in Polk City</p> <p><strong>11:16</strong> – Guidance on food safety for flooded fields, including National Organic Program waiting periods (90/120 days) and FSMA considerations</p> <p><strong>15:16</strong> – Why CoCoRaHS gauge density matters, plus a call for listeners to join the network</p> <p><strong>18:49</strong> – Discussion of why the storm's rainfall was under-forecasted, tied to an upper-level disturbance disrupting the priorheat dome</p> <p><strong>22:04</strong> – Revisiting "100-year" and "1,000-year" flood terminology and annual exceedance probability</p> <p><strong>24:23</strong> – Specialty crop impacts: Phytophthora risk in wet cucurbit/pepper fields, growth-regulator herbicide drift symptoms in tomatoes/peppers, and distinguishing drift damage from broad mite infestation</p> <p><strong>27:03</strong> – Tip on sanitizing surfaces efficiently using a hose-end sprayer</p> <p>episode summary generated using claude.ai</p> <p> </p>

July 1, 2026
Bonus Episode: Predicting Pest Arrival using VDIFN, with Ari Abbrescia, UW Madison Extension
<p>Resources:</p> <ul> <li><a href="https://agweather.cals.wisc.edu/vdifn">VDIFN Tool</a></li> <li><a href="https://www.youtube.com/watch?v=y3oqd7exFG0">Ari's tutorial on YouTube for visual aids</a></li> <li><a href= "https://docs.google.com/document/d/1-cV2ijOfm-0l2CbmFmE0XjYf39XpNZjI/edit"> VDIFN User's Manual</a></li> <li><a href="https://connect.doit.wisc.edu/cpn-risk-tool/">Crop Risk Tool</a></li> </ul> <p><strong>[00:00:08]</strong> Dan introduces the episode, recorded in advance while he's away, featuring guest Ari Abbrescia, Organic and Sustainable Agricultural Outreach Specialist with UW-Madison Extension.</p> <p><strong>[00:00:48]</strong> Ari provides an overview of the <a href="https://agweather.cals.wisc.edu/vdifn">VDIFN (Vegetable Disease and Insect Forecasting Network)</a>, including its creators — Dr. Amanda Gevens, Dr. Russ Groves, and Ben Bradford — and its role in supporting integrated pest management across the upper Midwest. </p> <p><strong>[00:02:06]</strong> Dan and Ari dig into a real-world example: why VDIFN appears to show flea beetles absent in Iowa when growers in southern Minnesota are already seeing them.</p> <p><strong>[00:03:36]</strong> Explaining the difference between Fahrenheit degree days (FDD) and growing degree days (GDD), and what those values mean within the flea beetle model.</p> <p><strong>[00:04:50]</strong> Ari clarifies that the VDIFN flea beetle model tracks the first hatched generation — not overwintering adults — which explains the apparent gap between model output and field observations.</p> <p><strong>[00:07:08]</strong> Key takeaway: VDIFN measures risk for damage, not pest presence — an especially important distinction when interpreting disease models like late blight.</p> <p><strong>[00:07:28]</strong> Dan shares how he wants to use VDIFN as a scouting lead-time tool for growers, and discusses Spinosad as a management option against adult flea beetles.</p> <p><strong>[00:08:42]</strong> Ari walks through the seed corn maggot model as a strong example of how VDIFN can directly inform planting timing decisions based on Fahrenheit degree day thresholds.</p> <p><strong>[00:10:18]</strong> Discussion of the early blight model for tomato, including how to use the biofix date and P-day accumulation to time preventative fungicide applications.</p> <p><strong>[00:11:14]</strong> Ari explains what P-days (physiological days) are and how they relate to degree days and disease severity tracking.</p> <p><strong>[00:14:31]</strong> Introduction of the <a href= "https://connect.doit.wisc.edu/cpn-risk-tool/">Crop Risk Tool</a> — a newer, still-developing tool built by Ben Bradford that allows users to save named locations, upload CSV field lists, and view risk across multiple models for specific sites.</p> <p><strong>[00:15:59]</strong> A key advantage of the Crop Risk Tool: it includes a 14-day NOAA-based forecast, allowing growers to look ahead and plan management decisions proactively.</p> <p><strong>[00:17:37]</strong> Comparing the two tools — VDIFN excels at visualizing spatial patterns and the movement of pest risk across the landscape; the Crop Risk Tool excels at site-specific, forward-looking risk assessment.</p> <p><strong>[00:19:23]</strong> Dan and Ari share a common wish-list feature: the ability for growers to select and view only their key pests and diseases for a saved location, rather than toggling through categories. Ari adds that text alerts are also a dream feature in early development.</p> <p><strong>[00:20:10]</strong> Dan notes that squash bugs and cucumber beetles are absent from VDIFN, sparking a discussion about overwintering adult pests and the diseases they vector, including bacterial wilt and squash mosaic virus.</p> <p><strong>[00:21:05]</strong> Conversation turns to Western flower thrips and onion thrips — including uncertainty about whether VDIFN's thrips model covers one, the other, or both — and whether the distinction matters for tomato spotted wilt virus management.</p> <p>Episode summary generated using claude.ai</p>

June 23, 2026
6/23/26 - NW is still dry, SE is still wet
<p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Welcome & Iowa Weather History: The 1952 F4 Tornado and the Train that raced to outrun it</strong> [00:00:07]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>7-Day Weather Forecast: Quieter Pattern, QPF Totals, and Warming Trend</strong> [00:01:15]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Ring of Fire & Ridge Riders: How the Setup Affects Iowa Rain Chances</strong> [00:02:13]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>8–14 Day & Monthly Climate Outlooks: Warm Signal, Near-Normal Precip, and El Niño Influence</strong> [00:02:39]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>8–14 Day Hazards: Slight Risk for High Temps and Heavy Precip in Southern Iowa</strong> [00:04:45]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Northwest Iowa Dryness vs. Southeast Wetness: Farmer Reports and Crop Conditions</strong> [00:06:56]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Past Week Weather Notables: EF2 Tornado, Tornado Climatology, and Illinois' Record Year</strong> [00:07:38]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Temperature Trends: Cooler-than-Normal Stretch Easing Stress from Low Rain</strong> [00:11:01]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Weekly Superlatives: Warmest, Coolest, and Wettest/Driest Gauges</strong> [00:11:51]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Specialty Crop Impacts: Cabbage Black Rot, Kale Leaf Spots, and Squash Vine Borer Alerts</strong> [00:12:48]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Overwintered Onion Success and Weed Management Benefits</strong> [00:15:23]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Upcoming Events: <a href= "https://www.regcytes.extension.iastate.edu/cea/">Controlled Environment Ag Short Course</a>, <a href= "https://www.iowaspecialtycrop.org/events/#!event/2026/7/23/2026-field-day"> ISCGA Field Day</a>, <a href= "https://www.chooseiowa.com/farmcrawl">Choose Iowa Farm Crawl</a></strong> [00:16:17]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> <strong>Special Forecast for Farm Crawl and Next Week's Episode Preview: Pest Forecasting with Degree-Day Models</strong> [00:17:57]</p> <p class= "my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top"> Episode summary generated using perplexity.ai</p>
115 total episodes available
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Roger VanDonselaarr
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