Shannon County Natural Disasters and Weather Extremes
The chance of earthquake damage in Shannon County is about the same as South Dakota average and is much lower than the national average. The risk of tornado damage in Shannon County is lower than South Dakota average and is much lower than the national average.
Earthquake Index, #19
| Shannon County | 0.05 |
| 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
| Shannon 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, #46
| Shannon County | 47.67 |
| 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 5,537 other weather extremes events within 50 miles of Shannon 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: | 17 | Cold: | 2 | Dense Fog: | 0 | Drought: | 0 |
| Dust Storm: | 0 | Flood: | 135 | Hail: | 3,645 | Heat: | 1 | Heavy Snow: | 14 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 1 | Landslide: | 0 | Strong Wind: | 98 |
| Thunderstorm Winds: | 1,455 | Tropical Storm: | 0 | Wildfire: | 24 | Winter Storm: | 32 | Winter Weather: | 2 |
| Other: | 111 | ||||||||
Volcanos Nearby
No volcano is found in or near Shannon County.
Historical Earthquake Events
No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Shannon County.
No historical earthquake events found in or near Shannon County.
Historical Tornado Events
A total of 13 historical tornado events that had recorded magnitude of 2 or above found in or near Shannon County.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 14.5 | 1999-06-04 | 2 | 43°10'N / 102°47'W | 43°12'N / 102°43'W | 4.00 Miles | 400 Yards | 0 | 0 | 0 | 0 | Shannon |
| Brief Description: This is the second tornado that formed just southwest of Oglala and then moved through the town. It was smaller then the first tornado and produced its damage about a half mile east of the first tornado. | |||||||||||
| 18.0 | 1999-06-04 | 2 | 43°03'N / 102°51'W | 43°13'N / 102°42'W | 15.00 Miles | 875 Yards | 1 | 54 | 3.2M | 0 | Shannon |
| Brief Description: This was the first of two tornadoes that swept through the town of Oglala. Spotters and law enforcement reported that the tornado went up and down several times. It remained on the ground just prior to hitting Oglala and then dissipated as it moved to the northeast. There was one fatality with 54 people receiving medical care for injuries. A church and three of its surrounding buildings were destroyed, 22 mobile homes destroyed, 30 to 50 buildings damaged and a lot of hail damage to roofs and vehicles. M54MH | |||||||||||
| 27.3 | 1983-08-17 | 2 | 43°12'N / 103°04'W | 0.20 Mile | 10 Yards | 0 | 0 | 25K | 0 | Fall River | |
| 30.4 | 1956-08-06 | 3 | 43°25'N / 102°11'W | 43°10'N / 101°44'W | 28.30 Miles | 100 Yards | 0 | 0 | 25K | 0 | Shannon |
| 33.0 | 1982-03-29 | 2 | 43°10'N / 101°57'W | 0.20 Mile | 10 Yards | 0 | 1 | 250K | 0 | Bennett | |
| 36.2 | 1962-05-20 | 2 | 42°48'N / 102°28'W | 42°51'N / 102°25'W | 3.60 Miles | 33 Yards | 0 | 0 | 25K | 0 | Sheridan |
| 38.4 | 1978-06-25 | 2 | 42°56'N / 102°14'W | 42°47'N / 102°08'W | 11.10 Miles | 300 Yards | 0 | 8 | 2.5M | 0 | Sheridan |
| 40.2 | 1983-06-19 | 2 | 43°10'N / 103°13'W | 43°00'N / 103°20'W | 12.00 Miles | 40 Yards | 0 | 0 | 25K | 0 | Fall River |
| 40.8 | 1966-06-22 | 2 | 43°41'N / 103°14'W | 43°42'N / 103°12'W | 0 | 0 | 25K | 0 | Custer | ||
| 41.4 | 1969-07-14 | 2 | 43°22'N / 103°23'W | 0.10 Mile | 33 Yards | 0 | 0 | 25K | 0 | Fall River | |
| 43.2 | 1963-06-06 | 3 | 43°08'N / 101°56'W | 43°18'N / 101°30'W | 24.40 Miles | 1167 Yards | 0 | 0 | 250K | 0 | Bennett |
| 48.5 | 1983-06-19 | 2 | 43°00'N / 103°20'W | 42°48'N / 103°17'W | 10.00 Miles | 40 Yards | 0 | 0 | 250K | 0 | Dawes |
| 49.1 | 1960-06-27 | 2 | 42°45'N / 103°06'W | 0 | 0 | 250K | 0 | Dawes | |||
* 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.