Sully County Natural Disasters and Weather Extremes
The chance of earthquake damage in Sully County is about the same as South Dakota average and is much lower than the national average. The risk of tornado damage in Sully County is lower than South Dakota average and is much lower than the national average.
Earthquake Index, #37
| Sully County | 0.02 |
| South Dakota | 0.05 |
| 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
| Sully County | 0.0000 |
| South Dakota | 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, #43
| Sully County | 55.58 |
| South Dakota | 114.73 |
| 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 5,310 other weather extremes events within 50 miles of Sully 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: | 15 | Cold: | 2 | Dense Fog: | 0 | Drought: | 0 |
| Dust Storm: | 0 | Flood: | 216 | Hail: | 3,060 | Heat: | 1 | Heavy Snow: | 11 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 0 | Landslide: | 0 | Strong Wind: | 26 |
| Thunderstorm Winds: | 1,879 | Tropical Storm: | 0 | Wildfire: | 14 | Winter Storm: | 24 | Winter Weather: | 0 |
| Other: | 62 | ||||||||
Volcanos Nearby
No volcano is found in or near Sully County.
Historical Earthquake Events
No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Sully County.
No historical earthquake events found in or near Sully County.
Historical Tornado Events
A total of 14 historical tornado events that had recorded magnitude of 2 or above found in or near Sully County.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 1.8 | 1971-10-01 | 2 | 44°43'N / 100°10'W | 0.50 Mile | 300 Yards | 0 | 0 | 25K | 0 | Sully | |
| 26.7 | 1992-06-30 | 2 | 44°22'N / 99°55'W | 0.30 Mile | 30 Yards | 0 | 0 | 25K | 0 | Hughes | |
| 27.3 | 1970-07-18 | 2 | 45°06'N / 100°18'W | 0 | 0 | 0K | 0 | Potter | |||
| 27.9 | 1973-07-23 | 3 | 44°21'N / 100°21'W | 2.50 Miles | 500 Yards | 0 | 10 | 2.5M | 0 | Hughes | |
| 27.9 | 1968-06-20 | 2 | 44°22'N / 100°24'W | 0 | 0 | 0K | 0 | Stanley | |||
| 28.1 | 1955-04-19 | 2 | 45°01'N / 99°56'W | 45°10'N / 99°51'W | 10.80 Miles | 67 Yards | 0 | 0 | 0K | 0 | Potter |
| 29.2 | 1955-04-19 | 2 | 45°01'N / 100°07'W | 45°16'N / 99°59'W | 18.20 Miles | 27 Yards | 0 | 0 | 3K | 0 | Potter |
| 38.3 | 1964-06-18 | 2 | 45°12'N / 99°49'W | 45°15'N / 99°47'W | 2.70 Miles | 200 Yards | 0 | 0 | 25K | 0 | Potter |
| 38.6 | 1964-06-08 | 2 | 45°05'N / 100°42'W | 45°09'N / 100°41'W | 3.80 Miles | 33 Yards | 0 | 1 | 0K | 0 | Dewey |
| 40.2 | 1961-06-28 | 2 | 45°15'N / 99°47'W | 1.00 Mile | 33 Yards | 0 | 0 | 250K | 0 | Walworth | |
| 42.4 | 2001-07-18 | 2 | 45°15'N / 99°40'W | 45°14'N / 99°40'W | 1.00 Mile | 100 Yards | 0 | 0 | 0 | 0 | Edmunds |
| Brief Description: A tornado touched down and heavily damaged a house. The attached garage was totally destroyed with two vehicles badly damaged. The metal roof was ripped off of the barn with three outbuildings destroyed. Five telephone/power poles were broken off with 1/2 to 3/4 of a mile of power lines down. Also, a small windmill was wrapped around a power pole. | |||||||||||
| 43.2 | 1960-08-24 | 2 | 44°22'N / 101°01'W | 44°26'N / 100°45'W | 13.60 Miles | 200 Yards | 0 | 1 | 25K | 0 | Stanley |
| 44.9 | 1983-09-02 | 2 | 44°54'N / 99°15'W | 0.20 Mile | 10 Yards | 0 | 0 | 3K | 0 | Hand | |
| 47.7 | 1974-05-19 | 2 | 44°21'N / 101°01'W | 44°25'N / 100°56'W | 5.60 Miles | 33 Yards | 0 | 0 | 0K | 0 | Stanley |
* 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.