Ralph, SD Natural Disasters and Weather Extremes
The chance of earthquake damage in Ralph is about the same as South Dakota average and is much lower than the national average. The risk of tornado damage in Ralph is much lower than South Dakota average and is much lower than the national average.
Earthquake Index, #433
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
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, #419
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 1,127 other weather extremes events within 50 miles of Ralph, SD were recorded from 1950 to 2010. The following is a break down of these events:
|Dust Storm:||0||Flood:||28||Hail:||522||Heat:||2||Heavy Snow:||29|
|High Surf:||0||Hurricane:||0||Ice Storm:||0||Landslide:||0||Strong Wind:||61|
|Thunderstorm Winds:||337||Tropical Storm:||0||Wildfire:||10||Winter Storm:||36||Winter Weather:||8|
No volcano is found in or near Ralph, SD.
Historical Earthquake Events
No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Ralph, SD.
No historical earthquake events found in or near Ralph, SD.
Historical Tornado Events
A total of 7 historical tornado events that had recorded magnitude of 2 or above found in or near Ralph, SD.
|Distance (miles)||Date||Magnitude||Start Lat/Log||End Lat/Log||Length||Width||Fatalities||Injuries||Property Damage||Crop Damage||Affected County|
|31.9||1972-05-25||2||45°31'N / 102°35'W||2.00 Miles||50 Yards||0||0||25K||0||Perkins|
|36.0||1964-08-01||2||45°31'N / 102°28'W||0.80 Mile||100 Yards||0||0||25K||0||Perkins|
|40.3||1969-07-17||2||45°54'N / 102°12'W||0||0||25K||0||Perkins|
|41.3||1968-06-20||2||45°47'N / 102°11'W||0||0||0K||0||Perkins|
|44.7||1977-06-14||2||46°15'N / 103°53'W||46°12'N / 103°43'W||8.20 Miles||33 Yards||0||1||250K||0||Bowman|
|48.1||2010-05-24||2||45°26'N / 102°09'W||45°33'N / 102°13'W||8.00 Miles||440 Yards||0||0||100K||0K||Perkins|
|Brief Description: EVENT NARRATIVE: A tornado touched down just southeast of the intersection of S.D. Highways 73 and 20 East. It destroyed the Progress Rural School and continued to track to the north, dissipating northwest of the intersection of S.D. Highways 73 and 20 West. EPISODE NARRATIVE: Severe thunderstorms spawned five tornadoes from southeastern Meade into northeastern Perkins County.|
|48.5||1975-06-29||4||46°32'N / 102°58'W||46°22'N / 102°02'W||45.80 Miles||880 Yards||1||4||2.5M||0||Hettinger|
* 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.