Yorkshire suffered a dramatic reversal in fortune on day two of their LV Championship match at Scarborough - allowing fellow relegation strugglers Warwickshire to recover from 53 for four to 320 all out and then slumping to 100 for seven.

Warwickshire's batting revival owed much to a cleanly-struck 113 from Tim Ambrose before Sreesanth rocked the Tykes by opening up with a double-wicket maiden which sent back Jacques Rudolph and captain Anthony McGrath - and the Indian returned later for good measure to pick up two more wickets.

The weather-hit first day had belonged to Yorkshire's bowlers. But they were soon under the cosh from Tony Frost and Ambrose as the fifth-wicket pair shared 15 boundaries in little over an hour.

Both Ajmal Shahzad, who had captured three of the first four wickets, and Matthew Hoggard were punished - and when Deon Kruis entered the attack he was flogged for four consecutive boundaries by Ambrose, whose 50 came up off 58 balls with 10 fours.

Yorkshire were forced to turn to the spin of David Wainwright, and he broke an 85-run stand in 21 overs by bowling Frost round his legs.

Rikki Clarke opened his account with a straight six off Wainwright and he cruised to 22 before he was caught behind by Gerard Brophy, attempting to cut a ball which was too close to him.

Ambrose eased his way to his second championship century of the season after lunch and he entered into another sizeable stand with Neil Carter, who blitzed Wainwright out of the attack by slamming him over midwicket for six and hitting him for three fours in an over soon afterwards.

Carter's 50 took only 40 balls, with nine fours and a six, and he continued his assault against Richard Pyrah by taking four and six off his first two deliveries.

The partnership was worth 110 in 17 overs when Kruis got rid of Ambrose, McGrath flinging out a left arm at midwicket to complete a good catch. Ambrose had faced 150 deliveries and struck 21 fours, many of them either through the covers or mid-wicket.

Carter also fell to a catch by McGrath, this time off Pyrah, for 67 from 59 balls with contained 10 fours and two sixes - and the Warwickshire tail soon subsided, Shahzad bowling last man Sreesanth middle stump to end with four for 78.

Sreesanth was soon in the thick of the drama with the ball, Rudolph cutting his first ball straight to backward-point - his second such dismissal in consecutive innings - and McGrath moving across his stumps to edge into Ambrose's gloves.

Joe Sayers and Andrew Gale put on 47 together before both fell to Naqaash Tahir, who had kept plugging away from the pavilion end with the new ball. Gale holed out to Chris Woakes at short midwicket, and Sayers pushed hard to Ian Bell at short mid-off.

Jonathan Bairstow was picked up at first slip by Frost off Carter as Yorkshire dipped to 67 for five - before Sreesanth returned to administer two further blows by getting both Shahzad and Pyrah snapped up in the slips to give him figures of 8-3-36-4.