Warren County, IA hail & severe wind history
255 storm reports on file for Warren County between 2010-04-02 and 2025-09-17 — 155 hail and 100 severe thunderstorm wind. That averages 15.9 reports a year, and Jun is the busiest month.
At a glance
- Most recent hail report: Sep 16, 2025 — 0.75" (penny), 4.18 mi S of St Marys. Last quarter-size (1") or larger: Apr 17, 2025, 1".
- Hail was reported on 57 days since 2010 — about 3.6 hail days a year.
- Largest hail on record: 3.5" (teacup) on Jun 30, 2014.
- Warren County has more hail reports than 96% of the 99 Iowa counties we cover.
Search every Warren County report
Check a single date first, or filter the full record below — pick a year, narrow to a month, or drag the hail-size slider to see only the larger stones (1", quarter size, is the National Weather Service severe threshold).
Loading Warren County storm reports…
Worst storm days in Warren County
| Date | Reports that day | Largest hail | Peak gust |
|---|---|---|---|
| 2014-06-30 | 34 | 3.5" (teacup) | 85 mph |
| 2018-06-28 | 15 | — | 87 mph |
| 2020-05-14 | 10 | 3" (teacup) | — |
| 2023-04-04 | 9 | 2.5" (tennis ball) | — |
| 2021-06-22 | 9 | 1.5" (ping pong ball) | — |
| 2017-04-15 | 7 | 2.5" (tennis ball) | — |
| 2021-06-18 | 7 | 1.75" (golf ball) | — |
| 2010-06-18 | 7 | 1.75" (golf ball) | 64 mph |
| 2017-03-06 | 6 | 1" (quarter) | 64 mph |
| 2011-06-09 | 5 | 1.75" (golf ball) | — |
Reports by year
Report counts are driven partly by how many people were around to report a storm, so recent years tend to look busier than the early 2010s. Treat the trend as a reporting trend, not purely a weather trend.
Notable large-hail events (2" and up)
| Date | Size | Near | What was reported |
|---|---|---|---|
| 2023-04-04 | 2" hen egg | 2.07 mi N of Cool | Delayed report via mping, time estimated by radar. |
| 2023-04-04 | 2.5" tennis ball | 4.37 mi WSW of Indianola | No narrative filed |
| 2020-05-14 | 2.75" baseball | 0 mi N of New Virginia | Media relayed image of baseball sized hail. Delayed report via social media. Time estimate via radar. |
| 2020-05-14 | 3" teacup | 0 mi N of New Virginia | Emergency management relayed report of 3 inch hail. |
| 2017-04-15 | 2.5" tennis ball | 2.81 mi N of Cool | Media relayed via social media public reports of hail just under baseball in size. Time estimated from radar. |
| 2014-06-30 | 2.5" tennis ball | 1.43 mi WSW of Sandyville | No narrative filed |
| 2014-06-30 | 2.75" baseball | .52 mi E of Sandyville | No narrative filed |
| 2014-06-30 | 3.5" teacup | 2.27 mi NNE of Sandyville | No narrative filed |
When does hail hit Warren County?
Across 16 years of records, June produced the most reports (108), followed by the months either side of it. Monthly totals:
| Month | Reports | Share |
|---|---|---|
| January | 0 | 0.0% |
| February | 3 | 1.2% |
| March | 12 | 4.7% |
| April | 42 | 16.5% |
| May | 38 | 14.9% |
| June | 108 | 42.4% |
| July | 21 | 8.2% |
| August | 10 | 3.9% |
| September | 13 | 5.1% |
| October | 3 | 1.2% |
| November | 3 | 1.2% |
| December | 2 | 0.8% |
Neighboring counties
Counties that share a border with Warren County (U.S. Census county adjacency), where we have storm records:
| County | Storm reports | Largest hail |
|---|---|---|
| Polk County, IA | 645 | 3.25" |
| Dallas County, IA | 268 | 3" |
| Marion County, IA | 236 | 4" |
| Clarke County, IA | 127 | 3.5" |
| Madison County, IA | 114 | 2.75" |
| Lucas County, IA | 62 | 2" |
Common questions about hail in Warren County
- How often does it hail in Warren County?
- Hail was reported on 57 separate days between 2010 and 2025, about 3.6 days a year, with June the busiest month for storm reports. 108 reports were quarter size (1") or larger.
- Does a report here mean hail hit my street?
- Not necessarily. Each report is one observation tied to a nearby landmark, and a county can be large. Storms also go unreported where few people live. Use the date check above to see what was reported nearby, and treat it as a starting point.
- How big is a 1.75" hailstone?
- Forecasters describe hail by everyday objects: 1" is a quarter, 1.75" a golf ball, 2.75" a baseball. The sizes in these reports are estimates made by the person reporting, not lab measurements.
- Where do I get the official record?
- All reports here come from the NOAA NCEI Storm Events Database, which you can search directly. For anything formal, use NOAA’s own records rather than this page.
Look up another place
About these numbers
Every row above is a report filed with the National Weather Service and archived in the NOAA NCEI Storm Events Database (FIPS 19181). Reports are eyewitness, trained-spotter and damage-survey observations, so they cluster near roads and towns and miss storms over empty country. Hail sizes are estimates. Damage figures are preliminary as filed and are never revised in this archive. Use this page for background, not for an insurance claim, a legal filing, or a roof assessment — for those, get the official record from NOAA directly.