Grant storm history
Storm events recorded in Grant, Wisconsin between 1950 and 2025.
968
Total events
55
Tornadoes
244
Hail
137
Floods
3
Deaths
$70.0M
Property damage
Most significant events
Strongest tornadoes, deadliest events, and biggest damage in this county. Up to 50 shown.
Tornado EF3 Tornado
A NWS storm survey confirmed that an EF3 tornado occurred across northern Grant County. The tornado started in Boscobel where damage to trees, power poles and power lines occurred. The tornado then moved east/southeast before dissipating south of Blue River. Along the path, six h…
The driver of a pickup failed to stop for a stop sign at an intersection along U.S. Highway 61 near Potosi, collided with a semi-truck and was thrown from the vehicle. According to the accident report, the driver was pronounced dead at the scene of the accident and that dense fog…
A tornado formed along a squall line west of Platteville, just south of County Road B, and traveled through Memorial Park on to the Univ. of Wisconsin - Platteville campus. Five people were injured, one of them seriously. There was extensive damage done to five buildings and the …
Very heavy rain produced flash flooding across the northeast part of Grant County. In Boscobel, numerous houses became surrounded by water with evacuations needed, most streets were flooded and cars were under water. 650 homes were impacted by the flood waters with two dozen fami…
The Grant County Emergency Manager reported that U.S. Highway 151 was closed at the SW Road interchange. County Road B was also closed for a while. County Road O sustained substantial damage and was likely closed for around a week. County Road U sustained shoulder damage. Water w…
Large hail was reported on Borah Ridge Road.
A major flash flood hit Grant County during the afternoon of June 12th impacting the communities of Lancaster, Potosi, Tennyson, Ellenboro, and other rural areas. Numerous rescues were performed from people trapped in cars, especially in the Potosi area where terrain enhanced the…
Highways 35 and 18 were closed due to mudslides and debris. Trees were even being knocked down by the slides.
Flash flood waters backed up in town as debris blocked area bridges. The water was three to four feet deep in places and propane gas containers began floating on the Mississippi River. Property damage in town was extensive.
Winter Storm Winter Storm
This winter storm brought between 9 and 13 inches of snowfall to Grant County over the course of November 29th and 30th. The highest snowfall report in the county was in Lancaster where 13 inches was observed.
Hail Hail
A storm chaser reported 2 inch diameter hail 2 mile south of Montfort.
Hail Hail
Emergency management reported quarter sized hail 1 mile north of Montfort. The report was relayed via NWS Chat.
Flood Flood
Heavy rainfall during the middle of August allowed the Platte River of Rockville to rise into flood stage during the evening hours on August 19th. The river then rose to a crest of 10.20 ft in minor flood stage before falling below flood stage during the morning hours on August 2…
Flash Flood Flash Flood
Emergency management reported street flooding in addition to flooding in basements of some residences in Lancaster.
Hail Hail
Emergency management reported nickel to quarter sized hail near the Lancaster Airport.
Flash Flood Flash Flood
Law enforcement reported water over highway 133 in Blue River with some homes being evacuated. Additionally, street flooding was reported by emergency management in Boscobel in northern Grant County.
Flash Flood Flash Flood
Emergency management reported debris blocking a railroad bridge resulting in storm water to overflow into portions of Bagley. This resulted in the inundation of several residences and prompted evacuations in the town.
Flash Flood Flash Flood
Emergency management reported numerous streets and intersections were closed due to flash flooding in Lancaster.
Flash Flood Flash Flood
Emergency management reported a washout along County Road H near Jamestown, with more dirt than water observed.
Flash Flood Flash Flood
Emergency management reported water over McAdam Road in Paris Township.
Flash Flood Flash Flood
Emergency management reported significant road damage from flooding near Bigpatch.
Flash Flood Flash Flood
Emergency management reported Morningview Road underwater in Lancaster as well as some water flowing into homes.
Flash Flood Flash Flood
Emergency Management reported water over the road at Porters Bridge Road near Five Points.
Thunderstorm Wind Thunderstorm Wind
Emergency management reported a tree branch down on a garage in Lancaster.
Thunderstorm Wind Thunderstorm Wind
Emergency management measured a 65 mph wind gust in Potosi.
Thunderstorm Wind Thunderstorm Wind
A mesonet station reported a 60 mph wind gust 2 miles south of Lancaster.
Thunderstorm Wind Thunderstorm Wind
Emergency management reported a 70 mph wind gust in Hazel Green as well as a few trees down on power lines.
Hail Hail
A CoCoRaHS observer reported ping pong ball sized hail 3 miles north-northwest of Burton.
Hail Hail
The public reported golf ball sized hail 3 miles west of Platteville.
Hail Hail
The public reported golf ball sized hail in Platteville. The report was relayed via social media.
Hail Hail
The public reported 2 inch diameter hail 2 miles west-northwest of Cornelia.
Hail Hail
The public reported 2 inch diameter hail 1 mile west-northwest of Platteville. The report was relayed via social media.
Hail Hail
The public reported baseball sized hail 3 miles west of Platteville.
Hail Hail
The public reported tennis ball sized hail 1 mile west of Platteville.
Thunderstorm Wind Thunderstorm Wind
Emergency management reported uprooted trees and power issues from Fennimore to Boscobel to Muscoda.
Thunderstorm Wind Thunderstorm Wind
A trained spotter measured a wind gust to 59 mph near Union in Grant County.
Winter Storm Winter Storm
Snowfall totals between 1 and 6 inches fell across Grant County with this winter system. The highest snowfall total reported in the county was 5.8 inches in Dickeyville.
Extreme Cold/Wind Chill Extreme Cold/Wind Chill
Dangerously cold wind chills began on the evening of the 20th and continued through noon on the 21st in Grant County where values dropped to between 30 to 40 degrees below zero. The coldest observed wind chill in the county was 37 degrees below zero at Platteville Municipal Airpo…
Winter Weather Winter Weather
Snowfall amounts ranged from 2 to 6 inches across Grant County as a result of this winter system. The highest storm total snow accumulation in the county occurred 2 miles southeast of Blue River where 6.0 was measured.
Ice Storm Ice Storm
Freezing rain impacted portions of Grant County resulting in ice accumulations of anywhere from a Trace to 0.25 across the county. The highest report was from 3 miles south-southwest of Beetown where a spotter reported 0.25 of ice accumulation.
Drought Drought
Throughout the entirety of September and through October 29th, only 1 to 2 inches of precipitation fell in Grant County. This 2 to 5 inch deficit for this period resulted in the development of severe drought across southern Grant County by mid-October. Severe drought conditions e…
Excessive Heat Excessive Heat
Anomalously warm air temperatures and high humidity allowed the maximum heat index to reach between 108 and 115 degrees across Grant County on August 26th. The heat index reached 109 degrees at the automated weather observation station at Platteville Airport and 115 degrees at th…
Events by year
| Year | Events | Tornadoes |
|---|---|---|
| 2025 | 29 | 0 |
| 2024 | 34 | 2 |
| 2023 | 22 | 0 |
| 2022 | 10 | 0 |
| 2021 | 24 | 1 |
| 2020 | 24 | 2 |
| 2019 | 40 | 0 |
| 2018 | 34 | 2 |
| 2017 | 60 | 0 |
| 2016 | 21 | 0 |
| 2015 | 25 | 0 |
| 2014 | 40 | 3 |
| 2013 | 30 | 1 |
| 2012 | 28 | 1 |
| 2011 | 31 | 0 |
| 2010 | 32 | 0 |
| 2009 | 58 | 1 |
| 2008 | 53 | 2 |
| 2007 | 36 | 5 |
| 2006 | 22 | 0 |
| 2005 | 10 | 1 |
| 2004 | 10 | 0 |
| 2003 | 20 | 0 |
| 2002 | 18 | 0 |
| 2001 | 26 | 0 |
| 2000 | 43 | 0 |
| 1999 | 14 | 0 |
| 1998 | 33 | 1 |
| 1997 | 10 | 0 |
| 1996 | 6 | 1 |
| 1995 | 13 | 0 |
| 1994 | 5 | 0 |
| 1991 | 4 | 1 |
| 1990 | 3 | 0 |
| 1989 | 6 | 0 |
| 1988 | 8 | 7 |
| 1987 | 1 | 0 |
| 1985 | 4 | 2 |
| 1984 | 6 | 0 |
| 1983 | 6 | 0 |
| 1981 | 1 | 0 |
| 1980 | 3 | 1 |
| 1979 | 2 | 0 |
| 1978 | 5 | 0 |
| 1977 | 6 | 0 |
| 1976 | 2 | 0 |
| 1975 | 6 | 0 |
| 1974 | 7 | 0 |
| 1973 | 5 | 1 |
| 1972 | 2 | 2 |
| 1971 | 7 | 6 |
| 1970 | 3 | 2 |
| 1969 | 7 | 5 |
| 1968 | 1 | 0 |
| 1967 | 2 | 1 |
| 1966 | 3 | 1 |
| 1965 | 1 | 0 |
| 1962 | 1 | 0 |
| 1959 | 2 | 1 |
| 1958 | 1 | 0 |
| 1957 | 1 | 1 |
| 1954 | 1 | 1 |