SOMERSET will have one eye on the weather forecast on Wednesday morning after putting Yorkshire under genuine pressure on day three of their Specsavers County Championship game at Taunton.

Although Yorkshire opener Adam Lyth continued his cricketing love affair with Taunton with another century against Somerset, the day belonged to the host county and their bowlers.

From a position of relative comfort at 172 for two, Yorkshire dramatically slumped to 237 for nine and only a resolute batting performance from last-wicket pair Steven Patterson and Jack Brooks kept Somerset from wrapping up the innings before the close.

Patterson (32 not out) and Brooks (34no) put on an unbroken 69-run stand to help Yorkshire reach 306 for nine at stumps, although they are still 256 runs behind Somerset's first-innings total and with another 107 runs required to avoid the follow on.

Somerset will look to increase the pressure on the defending champions on the final day, although their hopes of a first win of the season could yet be scuppered by the weather.

The morning session certainly belonged to Lyth, who not only helped himself to a third century in seven matches against Somerset at the County Ground, but in doing so topped 800 first-class runs on the ground over the same period of time.

Resuming on his overnight score of 80, England opener for last summer's Ashes struck three further boundaries, including a controlled six over third man, to reach three figures off 174 balls.

He lost second-wicket partner Will Rhodes for 15, caught by Jamie Overton off Peter Trego with the score on 145, before finally departing himself for 106 shortly after lunch.

Having played with due care and attention during the morning session, the 28-year-old flashed at a short delivery from Lewis Gregory and offered first slip Jim Allenby a catch he duly accepted.

Andrew Gale followed Lyth back to the pavilion having made just eight before the rains came to force an early tea at 213 for four.

When the players returned, Somerset applied intense pressure to a side who began the game on top of the Division One table. Having once again reached a position from where defeat was barely a consideration, Yorkshire lost five wickets for 11 runs in 35 balls.

Jack Leaning leant forward and edged a Gregory delivery to wicket-keeper Ryan Davies to make it 226 for five, before Yorkshire lost their next three wickets with the score stuck on 232.

First, Adil Rashid was run out without scoring in attempting a third run to Tom Abell on the boundary. Then Gary Ballance (37) was caught behind by Davies off the bowling of Tom Groenewald, who three balls later bowled Andy Hodd for a duck to leave Yorkshire 232 for eight in the 91st over.

Liam Plunkett did not last much longer, under-edging Groenewald to Davies for four to leave the visitors facing the prospect of having to bat again before the close.

However, any thoughts of a quickfire finish to the innings were put to bed by Patterson and Brooks in a determined last-wicket stand.