Hail and tornadoes in Rock County, WI
Since January 2021, radar estimated hail somewhere in Rock County, WI on 57 days. The biggest estimate: 2 in or larger (hen egg), on Fri, Apr 17, 2026. Hail was reported to the National Weather Service inside the county on 14 days.
Still loading: radar estimates go back to Wed, Oct 14, 2020, and the earlier years are being added.
Radar estimates are NOAA's MESH: the largest hail the radar estimates aloft, on cells about 0.7 mile across, shown as the lower bound of a size band (“1.5+”). They often run larger than what reached the ground, and they aren't evidence of damage at any address.
Hail on record since 1955
NOAA's Storm Events database lists 132 hail reports in Rock County, WI on 72 days, 12 of them 2 inches or larger. The largest: 2.75 in, near Evansville, on Fri, Apr 18, 2025.
By decade: 2000s: 41 · 2010s: 36 · 2020s: 55
Tornadoes since 1950
20 tornadoes have touched Rock County, WI since 1950, none of them rated F3/EF3 or stronger. They killed 0 and injured 1.
Strongest
- Sat, Jun 22, 2024 · EF2 · 6.03 mi long, 700 yd wide · near Afton
- Thu, Feb 8, 2024 · EF2 · 13.71 mi long, 750 yd wide · near Magnolia · 1 injury
- Fri, Apr 17, 2026 · EF1 · 3.3 mi long, 75 yd wide · near Johnstown Center
- Fri, Apr 17, 2026 · EF1 · 2.06 mi long, 100 yd wide · near Emerald Grove
- Fri, Apr 17, 2026 · EF1 · 1.89 mi long, 75 yd wide · near Tiffany
Most recent
- Fri, Apr 17, 2026 · EF1 · 3.3 mi long, 75 yd wide · near Johnstown Center
- Fri, Apr 17, 2026 · EF1 · 2.06 mi long, 100 yd wide · near Emerald Grove
- Fri, Apr 17, 2026 · EF1 · 1.89 mi long, 75 yd wide · near Tiffany
- Mon, Jul 15, 2024 · EF0 · 1.22 mi long, 50 yd wide · near Evansville
- Sat, Jun 22, 2024 · EF2 · 6.03 mi long, 700 yd wide · near Afton
- Sun, May 26, 2024 · EF0 · 10.89 mi long, 50 yd wide · near Emerald Grove
- Sun, May 26, 2024 · EF0 · 11.83 mi long, 50 yd wide · near Leyden
- Thu, Feb 8, 2024 · EF2 · 13.71 mi long, 750 yd wide · near Magnolia · 1 injury
- Thu, Jul 13, 2023 · EF0 · 0.39 mi long, 25 yd wide · near Emerald Grove
- Fri, Mar 31, 2023 · EF0 · 3.56 mi long, 100 yd wide · near Beloit
By decade: 2000s: 4 · 2010s: 3 · 2020s: 13
Still loading: NOAA's record goes back to 1950, and 2003 onward is in so far.
Every hail day since January 2021
- Fri, Aug 21, 2026
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Mon, Aug 10, 2026
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Sun, Aug 9, 2026
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Fri, Jul 3, 2026
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Wed, Jun 24, 2026
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county- 1.25 in (2 SE Milton, WI)
- Wed, Jun 10, 2026
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Fri, Apr 17, 2026
Radar estimate anywhere in the county: 2 in or larger (hen egg)
Reported in the county- 1 in (3 NNW Footville, WI)
- 1.75 in (Milton, WI)
- 2 in (3 E Beloit, WI)
- Tue, Apr 14, 2026
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Thu, Apr 2, 2026
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county- 1.5 in (2 NNE Janesville, WI)
- Tue, Mar 31, 2026
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Tue, Mar 10, 2026
Radar estimate anywhere in the county: 0.75 in or larger (penny)
Reported in the county- 1 in (1 SSW Beloit, WI)
- Mon, Sep 22, 2025
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Sat, Aug 16, 2025
Radar estimate anywhere in the county: 2 in or larger (hen egg)
Reported in the county- 1.5 in (2 W Janesville, WI)
- 1.5 in (1 N Clinton, WI)
- Sun, Jun 29, 2025
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Wed, Jun 25, 2025
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Fri, Apr 18, 2025
Radar estimate anywhere in the county: 2 in or larger (hen egg)
Reported in the county- 2.75 in (Edgerton, WI)
- 2.75 in (1 W Evansville, WI)
- Thu, Apr 17, 2025
Radar estimate anywhere in the county: 2 in or larger (hen egg)
Reported in the county- 2 in (Evansville, WI)
- Tue, Aug 27, 2024
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Sun, Jul 14, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Sat, Jul 13, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Tue, Jun 25, 2024
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county- 1.25 in (2 NE Janesville, WI)
- Mon, Jun 24, 2024
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Sat, Jun 22, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Sun, Jun 16, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Wed, Jun 12, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Mon, Jun 3, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Tue, May 7, 2024
Radar estimate anywhere in the county: 1.5 in or larger (ping-pong ball)
No hail reported in the county.
- Sat, May 4, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Sat, Apr 27, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Mon, Mar 4, 2024
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county- 1 in (6 SSE Orfordville, WI)
- 1.5 in (5 SSW Orfordville, WI)
- Thu, Feb 8, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Thu, Aug 24, 2023
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Wed, Aug 16, 2023
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Fri, Jul 28, 2023
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Wed, Jun 28, 2023
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Wed, May 31, 2023
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Thu, Apr 20, 2023
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Tue, Apr 4, 2023
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county- 1.25 in (6 NE EVANSVILLE, WI)
- Tue, Sep 20, 2022
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Mon, Aug 29, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Sat, Aug 13, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Sat, Jul 23, 2022
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county- 2 in (2 E EDGERTON, WI)
- Fri, Jul 22, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Tue, Jul 5, 2022
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county- 1 in (ORFORDVILLE, WI)
- 1 in (ORFORDVILLE, WI)
- Mon, Jul 4, 2022
Radar estimate anywhere in the county: 1.5 in or larger (ping-pong ball)
No hail reported in the county.
- Fri, May 13, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Tue, Feb 22, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Mon, Feb 21, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Tue, Sep 7, 2021
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county- 1 in (MILTON, WI)
- 1 in (4 WSW CLINTON, WI)
- 1 in (EDGERTON, WI)
- Tue, Aug 24, 2021
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Tue, Aug 10, 2021
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Sun, Aug 8, 2021
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Fri, Aug 6, 2021
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county- 1 in (5 W WHITEWATER, WI)
- Tue, Jul 27, 2021
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
- Thu, Jun 17, 2021
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Fri, Jun 11, 2021
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
- Tue, Mar 2, 2021
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Radar estimates and reports are for anywhere inside the county's boundary. Radar estimates come from NOAA's MRMS estimated hail size (MESH), the largest hail the radar estimates aloft on a ~1 km grid. They often run larger than the hail that reached the ground, and they aren't an observation at any address. Reports are what people reported to the National Weather Service. Neither is proof of damage or an official record for an insurance claim. From NOAA's Storm Events Database (NCEI), which records tornadoes from 1950, hail and thunderstorm wind from 1955, and every kind of storm from 1996. A tornado that crossed county lines is counted in each county it touched. Recent months are added as NCEI publishes them, a few months behind. Damage is in the dollars of its year and is often an estimate.