Pennington County Natural Disasters and Weather Extremes
The chance of earthquake damage in Pennington County is about the same as South Dakota average and is much lower than the national average. The risk of tornado damage in Pennington County is lower than South Dakota average and is much lower than the national average.
Earthquake Index, #5
| Pennington County | 0.20 |
| 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
| Pennington 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, #45
| Pennington County | 54.24 |
| 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 5,582 other weather extremes events within 50 miles of Pennington 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: | 146 | Hail: | 3,497 | Heat: | 1 | Heavy Snow: | 14 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 1 | Landslide: | 0 | Strong Wind: | 98 |
| Thunderstorm Winds: | 1,637 | Tropical Storm: | 0 | Wildfire: | 30 | Winter Storm: | 32 | Winter Weather: | 2 |
| Other: | 105 | ||||||||
Volcanos Nearby
No volcano is found in or near Pennington County.
Historical Earthquake Events
A total of 1 historical earthquake event that had a recorded magnitude of 3.5 or above found in or near Pennington County.
| Distance (miles) | Date | Magnitude | Depth (km) | Latitude | Longitude |
| 35.2 | 1966-06-26 | 4.1 | N/A | 44.3 | -103.4 |
Historical Tornado Events
A total of 7 historical tornado events that had recorded magnitude of 2 or above found in or near Pennington County.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 19.2 | 1967-06-18 | 2 | 44°04'N / 103°12'W | 1.00 Mile | 150 Yards | 0 | 3 | 2.5M | 0 | Pennington | |
| 23.1 | 1991-05-11 | 2 | 44°11'N / 103°13'W | 1.00 Mile | 300 Yards | 0 | 5 | 250K | 0 | Meade | |
| 23.8 | 1991-05-11 | 3 | 44°12'N / 103°13'W | 2.00 Miles | 500 Yards | 0 | 20 | 2.5M | 0 | Meade | |
| 29.0 | 1966-06-22 | 2 | 43°41'N / 103°14'W | 43°42'N / 103°12'W | 0 | 0 | 25K | 0 | Custer | ||
| 30.1 | 1966-07-23 | 2 | 43°58'N / 103°28'W | 43°56'N / 103°23'W | 3.80 Miles | 440 Yards | 0 | 5 | 25K | 0 | Pennington |
| 37.6 | 1965-06-11 | 2 | 43°49'N / 103°32'W | 0 | 0 | 3K | 0 | Custer | |||
| 47.3 | 1969-07-23 | 2 | 44°18'N / 103°41'W | 0.20 Mile | 33 Yards | 0 | 0 | 0K | 0 | Lawrence |
* 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.