Knox County, Ohio
Tornadoes, hail, floods and severe storms recorded here between 1957 and 2026, from NOAA's Storm Events Database. Search an address to see which tornadoes came closest to it.
14
Tornado reports
80
Hail reports
31
Floods since 1996
459
All events
1
Deaths
$791.7M
Property damage
Tornado paths in Knox County
The part of each tornado’s path NOAA recorded in this county, 14 in all. Zoom in and the paths widen to their surveyed width.
EF0EF1EF2EF3EF4EF5Unrated
Year by year
All storm eventsTornadoes
NOAA's storm database records tornadoes back to 1950 and hail and thunderstorm wind back to 1955, but floods only from 1996 on. Older floods are missing here. For those, the U.S. Geological Survey's stream gauge records and flood reports are the place to look.
Most significant events
The strongest tornadoes, deadliest events and biggest damage here, up to 50.
Thunderstorm winds downed many trees near Apple Valley Lake in northeastern Knox County. A vehicle travelling on U.S. 36 just west of Howard was struck by a falling tree. A two year old female inside the car was killed and four other occupants were seriously injured.
An intense line of thunderstorms or Derecho moved across Knox County during the late afternoon of June 29th causing extensive damage. Winds were estimated to be as much as 65 mph. Over 50 percent of residents lost power during this event. Power was not completely restored for sev…
High winds associated with the remnants of Hurricane Ike began late in the afternoon of September 14th and then continued through much of the evening. Wind gusts were estimated to be as much as 70 mph. Damage in the county was extensive with thousands of trees and many utility po…
Snow developed during the morning hours of the 7th, and continued for the next day and a half. Intensity varied through the day on the 7th, but during the evening hours the snow became rather light for a period of time. However, the snow intensified through the overnight and into…
Heavy thunderstorm rains fell on the northeastern corner of Knox County during the afternoon and early evening hours of July 10th. A spotter near the intersection of State Route 3 and College Hill Road (just south of the Ashland County line) measured a storm total of 7.5 inches. …
Continuing heavy thunderstorm rains brought major flooding, which continued in many areas through the day. Approximately one hundred people were evacuated from their homes. A number of people were trapped by the rising flood waters in vehicles and buildings and had to be rescued.…
Another round of thunderstorms with torrential rains produced additional flooding and contributed to ongoing flooding. Many roads were closed or remained closed. Forty families had to be evacuated from their homes. Before the thunderstorms moved away 10 inches or more of rainfall…
Thunderstorm Wind Thunderstorm Wind
Large Tree and power lines down on State Route 13 between Mount Vernon and Green Valley.
Thunderstorm Wind Thunderstorm Wind
Extensive roof damage to a building along with surrounding tree damage with limbs down east of Mount Vernon, OH.
Tornado EF0 Tornado
This very brief EF0 tornado with estimated peak winds of 75-mph began just west of Granny Creek Road, southwest of Fredericktown. The tornado ripped off part of a barn's metal roof and scattered the debris southeastward before the tornado ended in vicinity of the road. Radar data…
Hail Hail
Hail up to quarter-size in North Liberty.
Thunderstorm Wind Thunderstorm Wind
Trees downed in Mount Vernon.
Thunderstorm Wind Thunderstorm Wind
Trees downed in Fredericktown.
Hail Hail
Hail up to quarter-size about one-mile northeast of Mount Liberty.
Hail Hail
Hail up to quarter-size in Mount Vernon.
Hail Hail
Hail up to penny-size about one-mile south of Mount Vernon.
Thunderstorm Wind Thunderstorm Wind
Two trees downed near the intersection of Boynton Street and Gambier Road in Mount Vernon.
Thunderstorm Wind Thunderstorm Wind
Trees downed in Millwood.
Thunderstorm Wind Thunderstorm Wind
Large trees downed in Gambier.
Thunderstorm Wind Thunderstorm Wind
Numerous trees downed in Mount Vernon.
Thunderstorm Wind Thunderstorm Wind
Barn roof blown-off about five-miles NNW of Fredericktown.
Hail Hail
Hail up to half dollar-size along Treaty Road, about one-mile NNW of North Liberty.
Thunderstorm Wind Thunderstorm Wind
Trees downed or snapped about two-miles SSE of Bladensburg.
Thunderstorm Wind Thunderstorm Wind
Trees damaged about two-miles southeast of Martinsburg.
Tornado EF0 Tornado
An EF0 tornado with estimated peak winds of 80 mph formed near County Road 26, south of Sycamore Road in Knox County, where it damaged a large outbuilding and tree limbs. The tornado tracked east-northeastward, caused sporadic tree damage, and removed shingles and siding from res…
Thunderstorm Wind Thunderstorm Wind
Multiple trees downed and minor damage to barn along Grove Church Road, between Lee Wolfe Road and OH Route 229, about three-miles southeast of Gambier.
Flash Flood Flash Flood
Numerous roads will water flowing over them in Mount Vernon, Gambier, and eastern portions of Knox County. Radar estimated 2 to 2.75 inches of rainfall in a 90-120 minute period.
Hail Hail
Hail up to nickel-size on southeast side of Mount Vernon.
Hail Hail
Hail up to quarter-size about 1-mile northwest of downtown Mount Vernon.
Winter Storm Winter Storm
Developing low pressure moved across the Ohio Valley on February 16th, with a large area of generally light to moderate snow evolving north of the system. A narrow band of heavy snow with snow rates of up to 2 inches per hour evolved within the larger area of lighter snow across …
Thunderstorm Wind Thunderstorm Wind
Multiple tree limbs downed about 2.7-miles ENE of Centerburg and tree downed near intersection of Pleasant Valley Road and Keys Road, about 4-miles WSW of Mount Vernon.
Thunderstorm Wind Thunderstorm Wind
Several trees downed in Brandon.
Thunderstorm Wind Thunderstorm Wind
Numerous trees downed in Fredericktown.
Thunderstorm Wind Thunderstorm Wind
Numerous trees downed in Mount Vernon.
Winter Storm Winter Storm
An Arctic cold front swept through the area shortly before midnight December 23rd. Low pressure along this front tracked over Lake Erie early in the morning on December 23rd and rapidly intensified through the day while slowly lifting northeast across Ontario. With the frontal pa…
Extreme Cold/Wind Chill Extreme Cold/Wind Chill
Wind chills plunged below 0 by 5 AM December 23rd and did not rise above 0 until late in the evening on December 25th. A wind chill of -35F was recorded at 9:55 AM December 23rd at the Knox County Airport.
Thunderstorm Wind Thunderstorm Wind
Trees downed in Mount Vernon.
Thunderstorm Wind Thunderstorm Wind
Trees downed in Fredericktown.
Thunderstorm Wind Thunderstorm Wind
Trees downed in Martinsburg.
Thunderstorm Wind Thunderstorm Wind
Numerous trees downed in Mount Vernon.
Thunderstorm Wind Thunderstorm Wind
Numerous trees downed in Danville.
Thunderstorm Wind Thunderstorm Wind
NWS storm damage survey concluded a downburst with peak gusts of 80 mph downed numerous trees in Fredericktown.
Thunderstorm Wind Thunderstorm Wind
Several trees snapped or uprooted in Fredericktown. One of these trees damaged a fence.
Thunderstorm Wind Thunderstorm Wind
Numerous trees downed along OH-3. This damage occurred near the Knox/Ashland County line and near Rainbow Springs Family Campground, about three-miles northeast of Jelloway.
Tornado EF1 Tornado
As the tornado continued moving southeastward, trees and power poles were damaged along the tornado's path in Green Valley. A detached garage was destroyed with cinderblocks thrown about 20 yards into a nearby field. In addition, a barn was destroyed and farm equipment was displa…
Thunderstorm Wind Thunderstorm Wind
Two trees were downed in Mount Vernon, one of which fell onto a house and entered the living room. Extent of damage unknown and no pictures were provided.
Winter Storm Winter Storm
A prolonged winter storm occurred February 3rd and 4th, 2022 as multiple waves of low pressure tracked along a slow moving cold front. Rain changed to a mix of mainly sleet and some freezing rain during the early morning hours of February 3rd as temperatures fell below freezing. …
Events by year, as a table
| Year | Events | Tornadoes |
|---|---|---|
| 2026 | 9 | 1 |
| 2025 | 6 | 0 |
| 2024 | 8 | 1 |
| 2023 | 4 | 0 |
| 2022 | 13 | 1 |
| 2021 | 4 | 0 |
| 2020 | 13 | 0 |
| 2019 | 18 | 0 |
| 2018 | 2 | 0 |
| 2017 | 9 | 0 |
| 2016 | 2 | 0 |
| 2015 | 5 | 0 |
| 2014 | 8 | 0 |
| 2013 | 20 | 0 |
| 2012 | 15 | 0 |
| 2011 | 12 | 0 |
| 2010 | 14 | 0 |
| 2009 | 7 | 0 |
| 2008 | 17 | 0 |
| 2007 | 13 | 0 |
| 2006 | 15 | 1 |
| 2005 | 12 | 0 |
| 2004 | 25 | 0 |
| 2003 | 19 | 0 |
| 2002 | 27 | 0 |
| 2001 | 12 | 0 |
| 2000 | 13 | 1 |
| 1999 | 16 | 0 |
| 1998 | 31 | 1 |
| 1997 | 17 | 0 |
| 1996 | 17 | 0 |
| 1995 | 14 | 0 |
| 1994 | 6 | 0 |
| 1993 | 2 | 0 |
| 1992 | 2 | 0 |
| 1991 | 1 | 0 |
| 1990 | 4 | 1 |
| 1988 | 1 | 0 |
| 1987 | 1 | 0 |
| 1986 | 1 | 0 |
| 1985 | 1 | 0 |
| 1983 | 3 | 0 |
| 1982 | 3 | 2 |
| 1981 | 3 | 2 |
| 1980 | 2 | 0 |
| 1977 | 1 | 0 |
| 1974 | 2 | 0 |
| 1970 | 3 | 2 |
| 1968 | 2 | 0 |
| 1966 | 1 | 0 |
| 1963 | 1 | 0 |
| 1961 | 1 | 0 |
| 1957 | 1 | 1 |
Search your address
See every tornado that passed within 25 miles of a place in Knox County, measured to its path.
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