Cass County, IA hail & severe wind history
117 storm reports on file for Cass County between 2010-04-02 and 2025-07-07 — 36 hail and 81 severe thunderstorm wind. That averages 7.3 reports a year, and Jun is the busiest month.
At a glance
- Most recent hail report: Jun 15, 2025 — 1.5" (ping pong ball), 0.86 mi NE of Griswold.
- Hail was reported on 26 days since 2010 — about 1.6 hail days a year.
- Largest hail on record: 3" (teacup) on Sep 18, 2010.
- Cass County has more hail reports than 18% of the 99 Iowa counties we cover.
Search every Cass 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 Cass County storm reports…
Worst storm days in Cass County
| Date | Reports that day | Largest hail | Peak gust |
|---|---|---|---|
| 2011-03-22 | 6 | 1.5" (ping pong ball) | 60 mph |
| 2014-06-03 | 5 | 2.5" (tennis ball) | 64 mph |
| 2010-04-29 | 5 | 1" (quarter) | 60 mph |
| 2017-06-15 | 4 | 1" (quarter) | 69 mph |
| 2018-06-28 | 4 | — | 67 mph |
| 2018-04-13 | 4 | — | 61 mph |
| 2013-06-24 | 4 | — | 70 mph |
| 2014-06-30 | 3 | 2" (hen egg) | — |
| 2010-06-18 | 3 | 1" (quarter) | 70 mph |
| 2018-06-02 | 3 | — | 66 mph |
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 |
|---|---|---|---|
| 2024-04-30 | 2" hen egg | 2.6 mi W of Massena Swain Arpt | Delayed report, time estimated by radar. |
| 2018-08-31 | 2" hen egg | .86 mi SE of Marne | Trained spotter reported ping pong ball sized hail. |
| 2015-06-24 | 2" hen egg | 2.93 mi NE of Lorah | Law enforcement reported 2 inch hail. |
| 2014-06-30 | 2" hen egg | 3.78 mi NNE of Anita | Large hail and severe winds combined to produce damage to crop and houses. A semi was blown over on Interstate 80 near mile marker 71 by the strong winds. The wind driven hail stripped crops across the far northeast corner of the county. |
| 2014-06-03 | 2.5" tennis ball | .55 mi ENE of Cumberland | No narrative filed |
| 2010-09-18 | 3" teacup | 4.73 mi W of Massena Swain Arpt | No narrative filed |
When does hail hit Cass County?
Across 16 years of records, June produced the most reports (47), followed by the months either side of it. Monthly totals:
| Month | Reports | Share |
|---|---|---|
| January | 0 | 0.0% |
| February | 0 | 0.0% |
| March | 9 | 7.7% |
| April | 18 | 15.4% |
| May | 14 | 12.0% |
| June | 47 | 40.2% |
| July | 9 | 7.7% |
| August | 14 | 12.0% |
| September | 4 | 3.4% |
| October | 2 | 1.7% |
| November | 0 | 0.0% |
| December | 0 | 0.0% |
Neighboring counties
Counties that share a border with Cass County (U.S. Census county adjacency), where we have storm records:
| County | Storm reports | Largest hail |
|---|---|---|
| Pottawattamie County, IA | 202 | 4" |
| Guthrie County, IA | 170 | 3.5" |
| Adair County, IA | 139 | 4" |
| Montgomery County, IA | 119 | 3" |
| Shelby County, IA | 109 | 3" |
| Adams County, IA | 86 | 3" |
| Audubon County, IA | 86 | 1.75" |
Common questions about hail in Cass County
- How often does it hail in Cass County?
- Hail was reported on 26 separate days between 2010 and 2025, about 1.6 days a year, with June the busiest month for storm reports. 27 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 19029). 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.