Onalaska, Wisconsin Hail Report and Map: August 18, 2026
Was there hail in Onalaska, WI on August 18, 2026? Radar estimated hail up to 1.33 inches inside the town limits of Onalaska on August 18, 2026 (Eastern time). Radar estimates of at least 0.5 inch covered 78% of the town. Across the report area, the maximum radar estimate was 1.57 inches. The strongest part of the swath was about 12 miles northwest of La Crosse, WI. Radar detected hail aloft in this area between about 2:20 p.m. and 3:20 p.m. CT on August 18, 2026.
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Hail estimates at a glance
| Storm date (Eastern time) | August 18, 2026 (Tuesday) |
|---|---|
| Maximum radar estimate across the area | 1.57 inches; strongest part of the swath about 12 miles northwest of La Crosse, WI |
| Maximum radar estimate inside Onalaska | 1.33 inches |
| Share of Onalaska with radar estimates of at least 0.5 inch | 78% |
| Approximate radar timing | Between about 2:20 p.m. and 3:20 p.m. CT on August 18, 2026 (Central time) |
| County coverage includes (0.5 inch or larger) | La Crosse County (66 sq mi), Winona County (40 sq mi), Trempealeau County (37 sq mi) and Buffalo County (28 sq mi) |
| Area with radar estimates of 0.5 inch or larger | about 167 square miles |
| Area with radar estimates of 1 inch or larger | about 52 square miles |
| Source | NOAA MRMS radar hail estimates (MESH) |
Which towns had hail on August 18, 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 |
|---|---|---|---|
| Brice Prairie, WI | La Crosse County | 1.41 inches | 100% |
| Trempealeau, WI | Trempealeau County | 1.36 inches | 100% |
| Onalaska, WI | La Crosse County | 1.33 inches | 78% |
| La Crosse, WI | La Crosse County | 1.25 inches | 12% |
| Dakota, MN | 1.22 inches | 88% | |
| Winona, MN | Winona County | 1.13 inches | 38% |
| Fountain City, WI | Buffalo County | 1.02 inches | 18% |
| French Island, WI | La Crosse County | 0.98 inch | 25% |
| Goodview, MN | Winona County | 0.96 inch | 68% |
| Holmen, WI | La Crosse County | 0.95 inch | 40% |
| Homer, MN | 0.92 inch | 39% | |
| Pickwick, MN | 0.91 inch | 76% | |
| Dresbach, MN | 0.78 inch | 42% |
How big was the hail in Onalaska?
Radar estimated hail up to 1.33 inches inside the town limits of Onalaska. Among the listed towns, the highest estimate was 1.41 inches inside the limits of Brice Prairie. The maximum estimates in Dresbach were 0.78 inch or less. A town's maximum isn't an estimate for every home. Check the swath for estimates around an address.
Towns near the hail
The strongest part of the swath was within 15 miles of these towns. Distances and directions run from each town to that part of the swath.
- North La Crosse, WI: strongest radar estimates about 10 miles northwest of town
What time did radar detect hail?
Radar detected hail aloft in this area between about 2:20 p.m. and 3:20 p.m. CT on August 18, 2026. We used 17 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.