Garry Thompson's double inspired Scunthorpe to a resounding 4-1 victory over Derby and a first Coca-Cola Championship away win since September.
An outstanding first-half performance saw the Iron take a two-goal lead with strikes from Gary Hooper and Thompson.
Hooper broke the offside trap to slot home and Thompson doubled the lead with a low finish from 14 yards.
Kris Commons' deflected effort gave Derby some hope after 60 minutes, but Scunthorpe ended their 10-game winless run on the road with late goals from Thompson and Jonathan Forte.
With the Pride Park clash just one of three to survive the freezing weather in the Championship, Nigel Adkins' men pulled away from the relegation zone and moved level on points with Derby, who suffered a sixth home loss of the campaign.
Scunthorpe settled the better and with 12 minutes on the clock they were handed a golden opportunity to take the lead after some poor defending from Derby.
Left-back Dean Moxey attempted to pass the ball back without looking and only proceeded to send Hooper through on one-on-one with Stephen Bywater.
However, the striker dawdled in front of goal and allowed Bywater to smother the ball at his feet.
Hooper made amends a minute later, however.
Martyn Woolford again slipped Hooper through on goal and this time he did not waste the opportunity, coolly slotting past Bywater for his ninth of the season.
Then on the stroke of half-time the visitors got a second.
Full-back Andrew Wright pumped a long ball down the middle, which Miles Addison missed allowing Thompson to break clear and fire in from 14 yards.
The hosts introduced Commons at the interval in search of a second-half response and the Scotland international was at the heart of a strong Derby start to the half, twice going close.
But on the stroke of the hour, he made his most telling contribution as Derby clawed themselves back into the game.
Commons picked up the ball in the Scunthorpe half and went on a weaving run. After beating several players he scuffed his shot, but it deflected off Marcus Williams and wrong-footed the helpless Josh Lillis, trickling into the net.
Commons claimed the goal, but the dubious goal panel will be keen to take a look as the ball appeared to be drifting wide.
Derby sensed the opportunity and threw everything forward in an attempt to earn a point and they could have levelled but Wright heroically cleared off the line after Rob Hulse failed to connect properly from three yards.
And just as it seemed Derby would lay siege on the Scunthorpe penalty area, the visitors restored their two-goal lead with 10 minutes remaining.
Michael O'Connor broke down the right and pulled the ball back for Thompson, who stroked in his second in the coolest of fashions.
And the game was truly put to bed when Forte bundled in a loose ball with three minutes left.
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