Plunkett back with a bang
Yorkshire newcomer Liam Plunkett had Division One champions Warwickshire on the rack at Edgbaston when taking 5-32 in his best LV= County Championship performance since September 2009.
A shrewd recruit from Durham in the winter, the 28-year-old seamer removed three top-order batsmen without conceding a run in 18 balls in his first spell and came back to take the last two wickets in successive deliveries.
The home side were dismissed for 128 - their lowest total since the last time they lost a championship encounter, in 2011 - and resurgent Yorkshire had time to make 11 without loss by the close.
Andrew Gale's decision to bowl after a delayed start paid off in a big way as Warwickshire, with two batsmen among six players on the injured list, struggled against swing and seam movement.
Captain Jim Troughton, defiant for three hours in an undefeated 65, was the only player to cope as Plunkett and Ryan Sidebottom returned in style after missing the last Division One match against Somerset.
In that game, only bad weather at Headingley prevented Yorkshire from registering a third-straight win as their encouraging start to a new top-flight campaign following promotion continued.
With confidence high, it was a smooth transition to bring back Plunkett and Sidebottom, both Test bowlers in the past, as replacements for the injured Jack Brooks and Tim Bresnan, the latter with the England squad at Lord's.
Sidebottom set the standard in his opening burst, during which he conceded only four scoring strokes in eight overs and emerged with one wicket as Varun Chopra, on his return from England Lions duty, gave a slip catch to Adam Lyth.
It was Plunkett's appearance as first-change at the Birmingham End that was a catalyst for Warwickshire's troubles, though.
In his third over, Will Porterfield, on the back foot, steered a short ball to Richard Pyrah. The catch was athletic; the shot was disappointing.
Darren Maddy's first championship innings of the season ended with a clear-cut leg-before decision and Tim Ambrose followed Chopra by edging to Lyth.
Troughton managed to counter-attack with pleasing shots among his 10 boundaries while negotiating 132 balls, but a good delivery from Steven Patterson soon uprooted Chris Woakes' middle stump.
Rikki Carke became another lbw casualty when jabbing down late on a ball from Sidebottom, but a missed chance allowed Troughton to reach his second half-century of the summer.
Although Lyth was unable to make it a hat-trick of catches on Plunkett's return to the attack, it was not long before he took one from Tom Milnes, giving Patterson a return of 3-46.