Having reached 132-6 on the final day at Northwood, Middlesex captain James Franklin has decided to declare, setting Somerset 219 to win from 40 overs.
Middlesex are currently second in the Division One table, 141 points behind leaders Yorkshire.
"Essex's domination continued into the afternoon session as they set Glamorgan 462 for victory.
"Nick Browne and Liam Dawson's opening partnership of 237 beats the previous best against Glamorgan which had stood since 1991.
"Dawson fell agonisingly short of a seventh first class century as he chipped a catch back to Ingram for 99.
"Jesse Ryder and Ryan ten Doeschate added quick runs and Glamorgan will have 35 overs to survive on day three. The pitch is showing signs of variable bounce and taking spin."
"Rain has brought an early lunch on the final day at Merchant Taylors' School with Middlesex 41-2 in their second innings leading by 127 runs.
"After play was washed out on day three, Somerset lost their last two first innings wickets this morning to be dismissed for 197.
"The pitch is offering plenty to the bowlers so there is every chance that Middlesex may try to bat positively to double their lead and declare to try to force victory leaving potentially as many as 45 overs remaining."
"This has been a ridiculous morning. Chris Rushworth finished with five wickets for the third time in a row against Warwickshire as they were dismissed for 198.
"Although batting looked tricky there wasn't really any sign of the carnage to follow. At lunch Durham are 34-5, but importantly lead by 150 which may already be enough.
"They lost five wickets in the space of 7.2 overs while adding 28 runs as Chris Woakes took 3-12 in his first five overs."
"Another fascinating morning and the visitors will be the happier of the two sides at lunch.
"Darren Stevens departed early this morning off the bowling of James Burke for nine and Sam Curran claimed his second wicket of the match when he trapped Ben Harmison lbw for 17.
"Kent found themselves 154-6 but Sam Billings and Calum Haggett batted well in the face of some testing bowling and have guided the visitors to the interval with the scoreboard reading 199-6."
"With England selector Mick Newell watching, Browne has moved on an unbeaten 105 from 178 deliveries, reaching three figures in the grand manner with a straight six.
"The hosts lead by 308 runs at lunch and must decide how many more they need before declaring with an indifferent weather forecast to factor in. Browne has received strong support from Hampshire loanee Liam Dawson on 72."
Division One prospects
County Championship
Warwickshire will be hoping for runs from their lower order when they begin day three on 167-7 against Durham at Chester-le-Street, trailing by 147 runs.
A draw seems inevitable between Middlesex and Somerset following a third-day washout at Merchant Taylors' School, with the visitors 185-8 in their first innings.
Middlesex are currently third in the table and their first priority will be to take another wicket and earn maximum bowling bonus points.
Division Two prospects
County Championship
Essex are in a strong position against Glamorgan at Chelmsford, having ended day two on 78-0 in their second innings, a lead of 195.
Only 30 overs were possible on the opening day between Surrey and Kent at The Oval, with the visitors 132-4 at the close and brothers Tom and Sam Curran both in the wickets for the home side.
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Latest PostHarrison fifty aids Durham recovery
Durham 314 & 148, Warwickshire 198
Another fascinating session at Chester-le-Street saw Jamie Harrison's half-century rescue Durham from 55-7 to post 148 all out.
Coming in at number nine, Harrison hit 53 as he took Durham to a lead of 264.
However, with conditions still tough for batting, Warwickshire face a difficult evening session to give themselves a chance on the final day.
Click here for the full scorecard.
Sam Curran takes five on debut
Kent 336, Surrey 37-0
Surrey's teenage debutant Sam Curran took three more wickets in the afternoon session to finish with figures of 5-101.
The 17-year-old finally broke a seventh-wicket stand of 151 between Sam Billings and Calum Haggett when he trapped Billings lbw for 99.
Haggett was the final man to go for 80, his highest first-class score, to give Curran his five-for as Kent were all out for 336.
Surrey began their first innings after tea and moved quickly to 37-0.
Click here for the full scorecard.
Somerset set 219 off 40 overs
Middlesex 283 & 132-6d v Somerset 197
Having reached 132-6 on the final day at Northwood, Middlesex captain James Franklin has decided to declare, setting Somerset 219 to win from 40 overs.
Middlesex are currently second in the Division One table, 141 points behind leaders Yorkshire.
Click here for the full scorecard.
Glamorgan set 462 to win
Essex 279 & 344-4 (dec), Glamorgan 162
BBC Essex's Glenn Speller at Chelmsford:
"Essex's domination continued into the afternoon session as they set Glamorgan 462 for victory.
"Nick Browne and Liam Dawson's opening partnership of 237 beats the previous best against Glamorgan which had stood since 1991.
"Dawson fell agonisingly short of a seventh first class century as he chipped a catch back to Ingram for 99.
"Jesse Ryder and Ryan ten Doeschate added quick runs and Glamorgan will have 35 overs to survive on day three. The pitch is showing signs of variable bounce and taking spin."
Weather continues to frustrate at Northwood
Middlesex 283 & 41-2, Somerset 197
BBC London 94.9's Kevin Handat Northwood:
"Rain has brought an early lunch on the final day at Merchant Taylors' School with Middlesex 41-2 in their second innings leading by 127 runs.
"After play was washed out on day three, Somerset lost their last two first innings wickets this morning to be dismissed for 197.
"The pitch is offering plenty to the bowlers so there is every chance that Middlesex may try to bat positively to double their lead and declare to try to force victory leaving potentially as many as 45 overs remaining."
Wickets tumble at Chester-le-Street
Durham 314 & 34-5, Warwickshire 198
BBC Newcastle's Martin Emmerson at Chester-le-Street:
"This has been a ridiculous morning. Chris Rushworth finished with five wickets for the third time in a row against Warwickshire as they were dismissed for 198.
"Although batting looked tricky there wasn't really any sign of the carnage to follow. At lunch Durham are 34-5, but importantly lead by 150 which may already be enough.
"They lost five wickets in the space of 7.2 overs while adding 28 runs as Chris Woakes took 3-12 in his first five overs."
Kent fight back at The Oval
Kent 199-6 v Surrey
BBC London 94.9's Mark Church at The Oval:
"Another fascinating morning and the visitors will be the happier of the two sides at lunch.
"Darren Stevens departed early this morning off the bowling of James Burke for nine and Sam Curran claimed his second wicket of the match when he trapped Ben Harmison lbw for 17.
"Kent found themselves 154-6 but Sam Billings and Calum Haggett batted well in the face of some testing bowling and have guided the visitors to the interval with the scoreboard reading 199-6."
Essex on top against Glamorgan
Essex 279 & 191-0 v Glamorgan 162
BBC Essex's Glenn Speller at Chelmsford:
"The morning belongs to Essex and Nick Browne.
"With England selector Mick Newell watching, Browne has moved on an unbeaten 105 from 178 deliveries, reaching three figures in the grand manner with a straight six.
"The hosts lead by 308 runs at lunch and must decide how many more they need before declaring with an indifferent weather forecast to factor in. Browne has received strong support from Hampshire loanee Liam Dawson on 72."
Division One prospects
County Championship
Warwickshire will be hoping for runs from their lower order when they begin day three on 167-7 against Durham at Chester-le-Street, trailing by 147 runs.
A draw seems inevitable between Middlesex and Somerset following a third-day washout at Merchant Taylors' School, with the visitors 185-8 in their first innings.
Middlesex are currently third in the table and their first priority will be to take another wicket and earn maximum bowling bonus points.
Division Two prospects
County Championship
Essex are in a strong position against Glamorgan at Chelmsford, having ended day two on 78-0 in their second innings, a lead of 195.
Only 30 overs were possible on the opening day between Surrey and Kent at The Oval, with the visitors 132-4 at the close and brothers Tom and Sam Curran both in the wickets for the home side.
Post update
Commentaries available on this page: (scroll through the live coverage tab to select your game)
Full scorecards available here
Middlesex v Somerset - day four - BBC London 94.9 Sport
Durham v Warwickshire - day three - 5 live sports extra and BBC Newcastle
Essex v Glamorgan - day three - BBC Essex
Surrey v Kent - day two - BBC London 94.9