Janesville, Wisconsin Hail Report and Map: April 17, 2026
Was there hail in Janesville, WI on April 17, 2026? Radar estimated hail up to 1.57 inches inside the town limits of Janesville on April 17, 2026 (Eastern time). Radar estimates of at least 0.5 inch covered 100% of the town. Across the report area, the maximum radar estimate was 2.55 inches. The strongest part of the swath was about 84 miles east of Cedar Rapids, IA. Radar detected hail aloft in this area between about 1:15 p.m. and 7:20 p.m. CT on April 17, 2026.
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Hail estimates at a glance
| Storm date (Eastern time) | April 17, 2026 (Friday) |
|---|---|
| Maximum radar estimate across the area | 2.55 inches; strongest part of the swath about 84 miles east of Cedar Rapids, IA |
| Maximum radar estimate inside Janesville | 1.57 inches |
| Share of Janesville with radar estimates of at least 0.5 inch | 100% |
| Approximate radar timing | Between about 1:15 p.m. and 7:20 p.m. CT on April 17, 2026 (Central time) |
| County coverage includes (0.5 inch or larger) | Jo Daviess County (561 sq mi), Rock County (475 sq mi), Stephenson County (404 sq mi), Jones County (395 sq mi), Tama County (383 sq mi) and Jackson County (367 sq mi) |
| Area with radar estimates of 0.5 inch or larger | about 9,562 square miles |
| Area with radar estimates of 1 inch or larger | about 2,157 square miles |
| Source | NOAA MRMS radar hail estimates (MESH) |
Which towns had hail on April 17, 2026?
Radar estimated hail of at least 0.5 inch inside these town limits, using U.S. Census boundaries. Each percentage is the share of town area with those estimates.
| Town | County | Maximum radar estimate inside town limits | Town area with estimates of at least 0.5 inch |
|---|---|---|---|
| Bellevue, IA | Jackson County | 1.76 inches | 100% |
| Lake Summerset, IL | Winnebago County | 1.62 inches | 100% |
| The Galena Territory, IL | Jo Daviess County | 1.61 inches | 100% |
| Janesville, WI | Rock County | 1.57 inches | 100% |
| Davis, IL | Stephenson County | 1.57 inches | 100% |
| Grinnell, IA | Poweshiek County | 1.54 inches | 88% |
| Orfordville, WI | Rock County | 1.53 inches | 100% |
| Mitchellville, IA | Polk County | 1.51 inches | 50% |
| South Beloit, IL | Winnebago County | 1.48 inches | 100% |
| Lena, IL | Stephenson County | 1.46 inches | 100% |
| Stockton, IL | Jo Daviess County | 1.43 inches | 100% |
| Atchison, KS | Atchison County | 1.42 inches | 86% |
| Brodhead, WI | Green County | 1.42 inches | 100% |
| Beloit, WI | Rock County | 1.41 inches | 81% |
| Monroe, WI | Green County | 1.4 inches | 100% |
| Durand, IL | Winnebago County | 1.4 inches | 100% |
| Rockton, IL | Winnebago County | 1.38 inches | 100% |
| Roscoe, IL | Winnebago County | 1.26 inches | 70% |
| Cascade, IA | Dubuque County | 1.25 inches | 100% |
| East Troy, WI | Walworth County | 1.2 inches | 100% |
| Dodgeville, WI | Iowa County | 1.12 inches | 96% |
| Bethany, MO | Harrison County | 1.1 inches | 76% |
| Marshalltown, IA | Marshall County | 1.04 inches | 97% |
| Mount Vernon, IA | Linn County | 1.04 inches | 100% |
| Galena, IL | Jo Daviess County | 1.03 inches | 100% |
| Whitewater, WI | Walworth County | 1.02 inches | 50% |
| Colfax, IA | Jasper County | 1.01 inches | 79% |
| Tama, IA | Tama County | 0.97 inch | 100% |
| Mukwonago, WI | Waukesha County | 0.96 inch | 100% |
| Maryville, MO | Nodaway County | 0.92 inch | 36% |
| Dubuque, IA | Dubuque County | 0.91 inch | 5% |
| Tichigan, WI | Racine County | 0.83 inch | 100% |
| Chillicothe, MO | Livingston County | 0.82 inch | 79% |
| Knoxville, IA | Marion County | 0.81 inch | 46% |
| Newton, IA | Jasper County | 0.78 inch | 26% |
| Cameron, MO | Clinton County | 0.78 inch | 99% |
| Ankeny, IA | Polk County | 0.77 inch | 24% |
| Cedar Rapids, IA | Linn County | 0.76 inch | 6% |
| Muskego, WI | Waukesha County | 0.76 inch | 86% |
| Wind Lake, WI | Racine County | 0.75 inch | 100% |
How big was the hail in Janesville?
Radar estimated hail up to 1.57 inches inside the town limits of Janesville. Among the listed towns, the highest estimate was 1.76 inches inside the limits of Bellevue. The maximum estimates in Cedar Rapids, Dubuque and Ankeny were 0.91 inch or less. A town's maximum isn't an estimate for every home. Check the swath for estimates around an address.
What time did radar detect hail?
Radar detected hail aloft in this area between about 1:15 p.m. and 7:20 p.m. CT on April 17, 2026. We used 1,451 NOAA radar hail detections in this area to estimate the window. We trim outlying detection times when enough are available, then round down to five-minute marks. It doesn't give an arrival time at an address.
Data source and limits
We use NOAA's MRMS radar product MESH (Maximum Estimated Size of Hail) for hail-size estimates. Each town's figure is the maximum inside its Census town limits. The percentage is the town area with estimates of at least 0.5 inch. A town's maximum isn't an estimate for every home. Each storm date covers one calendar day in Eastern time. A late-evening storm west of the Eastern time zone can appear under two dates. Radar estimates don't confirm hail on the ground or roof damage. Hail of 0.5 to 0.75 inch can damage roofs, especially older roofs. An estimate below 1 inch doesn't rule out damage. Read how we calculate sizes and times.