Chad Hoffman clears snow from the entrance to his apartment building in Rapid City, S.D,, Saturday, Oct. 5, 2013. South Dakota emergency agencies are asking snowmobile operators in the Rapid City area to help find motorists stranded by an autumn storm. The National Weather Service says the storm dumped at least three and a half feet of wet, heavy snow in the Black Hills. Rapid City had 21 inches, but 31 inches was recorded just a mile southwest of the city. (AP Photo/Rapid City Journal, Chris Huber)

Associated Press
Chad Hoffman clears snow from the entrance to his apartment building in Rapid City, S.D,, Saturday, Oct. 5, 2013. South Dakota emergency agencies are asking snowmobile operators in the Rapid City area to help find motorists stranded by an autumn storm. The National Weather Service says the storm dumped at least three and a half feet of wet, heavy snow in the Black Hills. Rapid City had 21 inches, but 31 inches was recorded just a mile southwest of the city. (AP Photo/Rapid City Journal, Chris Huber)
Chad Hoffman clears snow from the entrance to his apartment building in Rapid City, S.D,, Saturday, Oct. 5, 2013. South Dakota emergency agencies are asking snowmobile operators in the Rapid City area to help find motorists stranded by an autumn storm. The National Weather Service says the storm dumped at least three and a half feet of wet, heavy snow in the Black Hills. Rapid City had 21 inches, but 31 inches was recorded just a mile southwest of the city. (AP Photo/Rapid City Journal, Chris Huber)
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