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Lee Erwin blasted home a pair of emphatic left-footed strikes set up by Lionel Ainsworth to give the hosts a clear advantage and the game was virtually over as a contest when Scott McDonald converted from close range on the stroke of half-time.
John Sutton got in on the act with his own double during the second half, concluding a damaging evening for Gary Teale's St Mirren, who are now 10 points behind Motherwell in 11th following a fourth consecutive loss.
Ross County are three points better off than Motherwell in 10th after securing a vital victory of their own, 1-0 at home to St Johnstone.
Article continues belowA tense encounter was settled when Liam Boyce headed home Jamie Reckord's cross six minutes from time, extending County's remarkable resurgence to seven wins in an eight-match unbeaten run.
