Grundy County Natural Disasters and Weather Extremes
Hot Missouri Rankings
The chance of earthquake damage in Grundy County is lower than Missouri average and is much lower than the national average. The risk of tornado damage in Grundy County is much lower than Missouri average and is much lower than the national average.
Earthquake Index, #111
| Grundy County | 0.00 |
| Missouri | 0.70 |
| U.S. | 1.81 |
The earthquake index value is calculated based on historical earthquake events data using USA.com algorithms. It is an indicator of the earthquake level in a region. A higher earthquake index value means a higher chance of an earthquake.
Volcano Index, #1
| Grundy County | 0.0000 |
| Missouri | 0.0000 |
| U.S. | 0.0023 |
The volcano index value is calculated based on the currently known volcanoes using USA.com algorithms. It is an indicator of the possibility of a region being affected by a possible volcano eruption. A higher volcano index value means a higher chance of being affected.
Tornado Index, #111
| Grundy County | 0.00 |
| Missouri | 214.01 |
| U.S. | 136.45 |
The tornado index value is calculated based on historical tornado events data using USA.com algorithms. It is an indicator of the tornado level in a region. A higher tornado index value means a higher chance of tornado events.
Other Weather Extremes Events
A total of 14,015 other weather extremes events within 50 miles of Grundy County were recorded from 1950 to 2010. The following is a break down of these events:
| Type | Count | Type | Count | Type | Count | Type | Count | Type | Count |
| Avalanche: | 0 | Blizzard: | 50 | Cold: | 92 | Dense Fog: | 31 | Drought: | 37 |
| Dust Storm: | 0 | Flood: | 1,764 | Hail: | 5,774 | Heat: | 103 | Heavy Snow: | 139 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 103 | Landslide: | 0 | Strong Wind: | 131 |
| Thunderstorm Winds: | 4,951 | Tropical Storm: | 0 | Wildfire: | 0 | Winter Storm: | 272 | Winter Weather: | 152 |
| Other: | 416 | ||||||||
Volcanos Nearby
No volcano is found in or near Grundy County.
Historical Earthquake Events
No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Grundy County.
No historical earthquake events found in or near Grundy County.
Historical Tornado Events
A total of 66 historical tornado events that had recorded magnitude of 2 or above found in or near Grundy County.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 3.5 | 1965-04-10 | 2 | 40°05'N / 93°42'W | 40°11'N / 93°33'W | 10.30 Miles | 100 Yards | 0 | 1 | 250K | 0 | Grundy |
| 10.0 | 1965-04-10 | 2 | 39°57'N / 93°46'W | 40°03'N / 93°36'W | 11.10 Miles | 50 Yards | 0 | 1 | 25K | 0 | Grundy |
| 10.0 | 1967-04-21 | 2 | 40°07'N / 93°25'W | 40°07'N / 93°20'W | 3.60 Miles | 50 Yards | 0 | 0 | 25K | 0 | Grundy |
| 11.0 | 1958-11-17 | 2 | 40°03'N / 93°27'W | 40°13'N / 93°16'W | 14.90 Miles | 50 Yards | 0 | 0 | 250K | 0 | Grundy |
| 14.0 | 1967-04-21 | 2 | 40°07'N / 93°20'W | 40°07'N / 93°16'W | 2.70 Miles | 50 Yards | 0 | 7 | 25K | 0 | Grundy |
| 15.3 | 1984-06-07 | 2 | 39°58'N / 93°49'W | 39°59'N / 93°46'W | 3.00 Miles | 100 Yards | 0 | 1 | 2.5M | 0 | Daviess |
| 15.8 | 1965-04-10 | 2 | 39°57'N / 93°47'W | 39°57'N / 93°46'W | 0 | 0 | 25K | 0 | Daviess | ||
| 16.8 | 1959-09-26 | 2 | 40°19'N / 93°45'W | 40°21'N / 93°39'W | 5.40 Miles | 50 Yards | 0 | 0 | 25K | 0 | Mercer |
| 17.3 | 1959-09-26 | 2 | 40°21'N / 93°39'W | 40°22'N / 93°37'W | 0 | 0 | 25K | 0 | Mercer | ||
| 19.4 | 1973-04-21 | 4 | 40°20'N / 93°33'W | 40°26'N / 93°23'W | 11.00 Miles | 440 Yards | 0 | 1 | 250K | 0 | Mercer |
| 20.3 | 1958-11-17 | 2 | 40°12'N / 93°56'W | 40°16'N / 93°54'W | 4.10 Miles | 100 Yards | 0 | 0 | 250K | 0 | Harrison |
| 24.6 | 1989-05-24 | 2 | 40°26'N / 93°46'W | 2.50 Miles | 73 Yards | 0 | 0 | 2.5M | 0 | Harrison | |
| 24.8 | 1967-04-21 | 2 | 40°01'N / 94°06'W | 40°04'N / 93°57'W | 8.40 Miles | 90 Yards | 0 | 0 | 25K | 0 | Daviess |
| 25.6 | 2004-05-29 | 4 | 40°12'N / 94°02'W | 40°13'N / 94°02'W | 2.00 Miles | 800 Yards | 0 | 0 | 0 | 0 | Harrison |
| Brief Description: Large F4 tornado crossed into Harrison county from Daviess county 5 miles south of Bethany over rural land and then dissipated. | |||||||||||
| 25.9 | 1973-04-21 | 4 | 40°26'N / 93°23'W | 40°28'N / 93°19'W | 3.60 Miles | 440 Yards | 0 | 0 | 250K | 0 | Putnam |
| 28.5 | 1970-04-29 | 2 | 40°25'N / 93°59'W | 40°35'N / 93°31'W | 27.00 Miles | 440 Yards | 0 | 0 | 250K | 0 | Harrison |
| 30.1 | 1975-04-23 | 3 | 39°44'N / 93°21'W | 39°45'N / 93°11'W | 8.60 Miles | 500 Yards | 0 | 0 | 250K | 0 | Linn |
| 30.7 | 1975-04-23 | 4 | 39°42'N / 93°58'W | 39°46'N / 93°46'W | 11.40 Miles | 400 Yards | 1 | 3 | 2.5M | 0 | Caldwell |
| 31.5 | 1960-04-16 | 2 | 40°28'N / 93°25'W | 40°30'N / 93°01'W | 20.90 Miles | 100 Yards | 0 | 0 | 25K | 0 | Mercer |
| 33.0 | 1984-06-07 | 2 | 39°52'N / 94°06'W | 1.00 Mile | 100 Yards | 0 | 0 | 250K | 0 | Daviess | |
| 33.1 | 1975-04-23 | 3 | 39°45'N / 93°11'W | 39°47'N / 93°05'W | 5.40 Miles | 500 Yards | 0 | 2 | 250K | 0 | Linn |
| 33.1 | 1960-04-16 | 3 | 40°22'N / 94°13'W | 40°25'N / 93°56'W | 15.10 Miles | 300 Yards | 0 | 4 | 25K | 0 | Harrison |
| 33.6 | 1980-06-02 | 4 | 40°36'N / 93°36'W | 40°35'N / 93°19'W | 14.70 Miles | 33 Yards | 0 | 0 | 2.5M | 0 | Wayne |
| 33.7 | 1984-06-07 | 4 | 40°25'N / 94°02'W | 40°34'N / 93°54'W | 10.00 Miles | 200 Yards | 1 | 1 | 2.5M | 0 | Harrison |
| 33.8 | 1970-04-29 | 2 | 40°35'N / 93°31'W | 40°37'N / 93°29'W | 2.30 Miles | 800 Yards | 0 | 0 | 2.5M | 0 | Wayne |
| 33.9 | 2004-05-29 | 4 | 39°57'N / 94°16'W | 40°08'N / 94°08'W | 16.00 Miles | 800 Yards | 0 | 0 | 0 | 0 | Daviess |
| Brief Description: Large F4 tornado crossed into Daviess county from Dekalb county at 2135 and then crossed into Harrison county at 2150. Tornado stayed in rural areas of the Grand River flood plain. | |||||||||||
| 35.7 | 1980-06-02 | 4 | 40°37'N / 93°55'W | 40°36'N / 93°36'W | 16.50 Miles | 140 Yards | 0 | 0 | 2.5M | 0 | Decatur |
| 36.1 | 1967-04-21 | 2 | 39°39'N / 93°14'W | 39°41'N / 93°11'W | 3.00 Miles | 200 Yards | 0 | 0 | 250K | 0 | Chariton |
| 37.1 | 2004-05-29 | 4 | 39°53'N / 94°15'W | 39°55'N / 94°10'W | 4.00 Miles | 800 Yards | 3 | 6 | 300K | 0 | De Kalb |
| Brief Description: Large F4 tornado touched down 2 miles south of Weatherby and moved east northeast. The tornado killed 3 persons near Weatherby. The 80 and 60 year old fatalities occurred in a destroyed frame house. Two mobile homes were destroyed with one having the 54 year old fatality. The tornado crossed into Daviess county 4 miles east of Weatherby. F80PH, F60PH, M54PH | |||||||||||
| 38.5 | 1984-06-07 | 4 | 40°35'N / 93°54'W | 40°44'N / 93°32'W | 22.00 Miles | 250 Yards | 0 | 0 | 25.0M | 0 | Decatur |
| 38.5 | 1980-06-02 | 2 | 40°39'N / 93°25'W | 40°39'N / 93°19'W | 4.70 Miles | 80 Yards | 0 | 0 | 250K | 0 | Wayne |
| 38.9 | 1973-04-19 | 2 | 40°09'N / 94°19'W | 40°10'N / 94°17'W | 0 | 0 | 3K | 0 | Gentry | ||
| 40.0 | 1958-10-08 | 3 | 40°27'N / 94°13'W | 40°27'N / 94°09'W | 3.00 Miles | 300 Yards | 0 | 0 | 250K | 0 | Harrison |
| 40.3 | 1967-04-21 | 3 | 39°28'N / 93°46'W | 39°36'N / 93°33'W | 14.60 Miles | 440 Yards | 0 | 0 | 250K | 0 | Ray |
| 40.4 | 1971-05-05 | 3 | 39°39'N / 93°04'W | 39°42'N / 93°03'W | 2.70 Miles | 50 Yards | 0 | 0 | 2.5M | 0 | Chariton |
| 40.7 | 1957-05-20 | 2 | 39°51'N / 94°21'W | 39°57'N / 94°13'W | 9.80 Miles | 200 Yards | 0 | 0 | 25K | 0 | De Kalb |
| 40.8 | 1955-03-14 | 3 | 39°39'N / 94°06'W | 39°40'N / 94°01'W | 4.10 Miles | 250 Yards | 0 | 0 | 250K | 0 | Caldwell |
| 41.5 | 1971-05-05 | 3 | 39°43'N / 92°59'W | 39°43'N / 92°58'W | 0 | 0 | 2.5M | 0 | Chariton | ||
| 41.8 | 1971-05-05 | 3 | 39°43'N / 92°58'W | 39°44'N / 92°57'W | 0 | 12 | 2.5M | 0 | Linn | ||
| 41.9 | 1971-05-05 | 3 | 39°38'N / 93°04'W | 39°39'N / 93°04'W | 1.10 Miles | 50 Yards | 0 | 4 | 2.5M | 0 | Chariton |
| 41.9 | 1973-04-19 | 2 | 40°05'N / 94°24'W | 40°09'N / 94°19'W | 5.90 Miles | 50 Yards | 0 | 0 | 3K | 0 | Gentry |
| 41.9 | 1961-04-23 | 2 | 40°43'N / 93°44'W | 40°43'N / 93°33'W | 9.30 Miles | 600 Yards | 0 | 2 | 2.5M | 0 | Decatur |
| 42.1 | 1988-05-08 | 2 | 40°37'N / 93°20'W | 40°42'N / 93°05'W | 9.00 Miles | 43 Yards | 0 | 0 | 250K | 0 | Wayne |
| 42.2 | 1989-05-24 | 4 | 40°41'N / 93°59'W | 40°38'N / 93°52'W | 9.00 Miles | 300 Yards | 0 | 0 | 25.0M | 0 | Decatur |
| 42.2 | 1971-05-05 | 3 | 39°37'N / 93°06'W | 39°38'N / 93°04'W | 0 | 2 | 2.5M | 0 | Chariton | ||
| 42.9 | 1960-04-16 | 3 | 40°18'N / 94°26'W | 40°22'N / 94°13'W | 11.90 Miles | 300 Yards | 0 | 0 | 25K | 0 | Benton |
| 43.2 | 1999-04-08 | 2 | 39°30'N / 93°18'W | 39°43'N / 92°52'W | 26.00 Miles | 200 Yards | 0 | 0 | 600K | 100K | Chariton |
| Brief Description: The Carroll County tornado continued northeast across Chariton County damaging or destroying several outbuildings near Mendon and 5 miles south of Marceline. In addition, a single family home suffered minor damage, and a mobile home was damaged 5 miles south of Marceline. Severe weather broke out in northwest and west-central Missouri around midday on April 8. Storms tracked rapidly northeastward and moved into central and north-central Missouri by early evening. The outbreak included at least five tornadoes, one of which moved along a 54-mile path across three counties. Reports of thunderstorm wind damage were also widespread throughout the area. | |||||||||||
| 43.4 | 1960-04-16 | 2 | 40°30'N / 93°01'W | 40°32'N / 92°51'W | 8.70 Miles | 100 Yards | 0 | 0 | 25K | 0 | Mercer |
| 44.0 | 1964-06-22 | 2 | 40°44'N / 93°45'W | 1.00 Mile | 200 Yards | 0 | 0 | 250K | 0 | Decatur | |
| 44.1 | 1973-04-19 | 2 | 39°42'N / 94°12'W | 1.00 Mile | 50 Yards | 0 | 0 | 3K | 0 | Clinton | |
| 44.5 | 1999-04-08 | 2 | 39°28'N / 93°24'W | 39°31'N / 93°17'W | 6.50 Miles | 200 Yards | 0 | 0 | 300K | 100K | Carroll |
| Brief Description: The tornado touched down 3 miles west of Bosworth and moved northeast into Chariton and Macon Counties. A home was destroyed 1 mile north of Bosworth and several large trees were downed before the tornado moved into Chariton County. Severe weather broke out in northwest and west-central Missouri around midday on April 8. Storms tracked rapidly northeastward and moved into central and north-central Missouri by early evening. The outbreak included at least five tornadoes, one of which moved along a 54-mile path across three counties. Reports of thunderstorm wind damage were also widespread throughout the area. | |||||||||||
| 44.7 | 2004-05-24 | 2 | 40°12'N / 94°33'W | 40°15'N / 94°15'W | 17.00 Miles | 250 Yards | 0 | 1 | 10.0M | 0 | Gentry |
| Brief Description: This F2 tornado was consistently on the ground from one mile south of Stanberry east-northeast through Albany. Muliple vortices were noticed on chaser video. Extensive damage was observed in Albany. Three homes were destroyed. There were 34 buildings with major damage and 70 buildings had minor damage. | |||||||||||
| 44.8 | 1955-03-14 | 3 | 39°39'N / 94°13'W | 39°39'N / 94°06'W | 5.70 Miles | 250 Yards | 0 | 1 | 250K | 0 | Caldwell |
| 45.6 | 1965-04-10 | 2 | 39°47'N / 94°25'W | 39°52'N / 94°16'W | 9.60 Miles | 50 Yards | 0 | 7 | 250K | 0 | De Kalb |
| 46.7 | 1971-05-18 | 2 | 39°46'N / 94°27'W | 39°52'N / 94°16'W | 11.80 Miles | 50 Yards | 0 | 0 | 25K | 0 | De Kalb |
| 46.8 | 1984-06-07 | 4 | 40°44'N / 93°32'W | 40°49'N / 93°13'W | 19.00 Miles | 250 Yards | 0 | 0 | 25.0M | 0 | Wayne |
| 47.3 | 1991-04-26 | 2 | 40°42'N / 93°22'W | 40°51'N / 93°18'W | 9.00 Miles | 60 Yards | 0 | 0 | 250K | 0 | Wayne |
| 47.7 | 1955-03-14 | 3 | 39°39'N / 94°15'W | 39°39'N / 94°13'W | 0 | 0 | 250K | 0 | Clinton | ||
| 48.0 | 1991-04-26 | 2 | 40°38'N / 93°16'W | 40°51'N / 93°05'W | 15.00 Miles | 77 Yards | 0 | 2 | 2.5M | 0 | Wayne |
| 48.4 | 2004-05-29 | 2 | 39°43'N / 94°21'W | 39°46'N / 94°20'W | 5.00 Miles | 100 Yards | 0 | 0 | 0 | 0 | De Kalb |
| Brief Description: Tornado touched down in open country and traveled 5 miles. | |||||||||||
| 48.5 | 2001-04-11 | 2 | 40°24'N / 94°22'W | 40°36'N / 94°18'W | 14.00 Miles | 100 Yards | 0 | 0 | 100K | 0 | Worth |
| Brief Description: The tornado that initially touched down in Gentry county, crossed into Worth county at 1032 am, 2 miles west of Denver. It crossed into Iowa 8 miles north of Allendale at 1040 am. One home was destroyed along with several out buildings. | |||||||||||
| 48.5 | 1984-04-26 | 2 | 40°12'N / 94°33'W | 40°14'N / 94°24'W | 7.00 Miles | 100 Yards | 0 | 0 | 250K | 0 | Gentry |
| 48.8 | 2006-04-15 | 2 | 39°45'N / 94°29'W | 39°54'N / 94°20'W | 13.00 Miles | 100 Yards | 0 | 0 | 75K | 0 | De Kalb |
| Brief Description: PSDA indicated a second tornado initially touched down just north of the De Kalb-Clinton County line about 1 mile east of Stewartsville, Missouri along Highway 36, where F1 damage was noted to a destroyed pole barn. The tornado tracked northeast producing F1 damage about a third of a mile north of the intersection of Fairview and Rogers Roads, where a second pole barn was destroyed. The tornado then intensified as it tracked northeast, producing F2 damage to a home near the intersection of Grindstone and Baker Roads. The tornado lifted just north of the intersection of Routes C and 6. | |||||||||||
| 49.2 | 1961-05-07 | 2 | 39°24'N / 93°26'W | 39°25'N / 93°25'W | 0 | 0 | 25K | 0 | Carroll | ||
| 49.6 | 1958-10-10 | 3 | 40°25'N / 94°36'W | 40°27'N / 94°13'W | 20.10 Miles | 300 Yards | 2 | 7 | 250K | 0 | Worth |
| 49.8 | 1961-05-07 | 2 | 39°23'N / 93°37'W | 39°24'N / 93°26'W | 9.60 Miles | 50 Yards | 0 | 0 | 25K | 0 | Carroll |
* The information on this page is based on the global volcano database, the U.S. earthquake database of 1638-1985, and the U.S. Tornado and Weather Extremes database of 1950-2010.