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Ralph, SD Natural Disasters and Weather Extremes

 
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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.

Topics:Earthquake IndexVolcano IndexTornado IndexOther Weather Extremes EventsVolcanos NearbyHistorical Earthquake EventsHistorical Tornado Events

Earthquake Index, #433

Ralph, SD
0.00
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

Ralph, SD
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, #419

Ralph, SD
33.31
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 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:

TypeCountTypeCountTypeCountTypeCountTypeCount
Avalanche:0Blizzard:43Cold:16Dense Fog:0Drought:5
Dust Storm:0Flood:28Hail:522Heat:2Heavy Snow:29
High Surf:0Hurricane:0Ice Storm:0Landslide:0Strong Wind:61
Thunderstorm Winds:337Tropical Storm:0Wildfire:10Winter Storm:36Winter Weather:8
Other:30 

Volcanos Nearby

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)DateMagnitudeStart Lat/LogEnd Lat/LogLengthWidthFatalitiesInjuriesProperty DamageCrop DamageAffected County
31.91972-05-25245°31'N / 102°35'W2.00 Miles50 Yards0025K0Perkins
36.01964-08-01245°31'N / 102°28'W0.80 Mile100 Yards0025K0Perkins
40.31969-07-17245°54'N / 102°12'W0025K0Perkins
41.31968-06-20245°47'N / 102°11'W000K0Perkins
44.71977-06-14246°15'N / 103°53'W46°12'N / 103°43'W8.20 Miles33 Yards01250K0Bowman
48.12010-05-24245°26'N / 102°09'W45°33'N / 102°13'W8.00 Miles440 Yards00100K0KPerkins
 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.
48.51975-06-29446°32'N / 102°58'W46°22'N / 102°02'W45.80 Miles880 Yards142.5M0Hettinger


* 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.


 
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