Essex's Harmer takes five wickets; Cook passes 50
Lancs' Buttler & Hameed out cheaply
Duckett scores 89-ball century
Stokes out for a duck for Durham
Fifties for Surrey's Roy, Burns & Sangakkara
Heavy rain overnight and this morning mean the start of the second day will almost certainly be delayed.
The local forecast says it may turn to showers later, so a later start to the day may mean some cricket later.
Worcestershire will be frustrated having had by far the better of the opening day.
So, at almost 10pm, the first day of day-night County Championship fixtures is at an end.
We'll be taking a closer look at how things unfolded, with plenty of analysis, on the BBC Sport website shortly, so keep your eyes peeled for that.
I'll be back with Felix Keith tomorrow at 13:45 BST to bring you all the action from day two.
Sleep well!
Image source, Getty ImagesDivision One
Division Two
#bbccricket
Scott: It's even weirder watching the county cricket updates two hours ahead in Rhodes.
Glamorgan 5-0 v Derbyshire 288
Glamorgan nightwatchman Timm van der Gugten and conventional opener Jacques Rudolph have seen off the two overs without any drama.
Earlier, Derbyshire did well to make 288, with Tom Milnes' 53 and Tony Palladino's 23 boosting their total. Interesting second day ahead.
Warwickshire 23-1 v Lancashire 273
That's also your lot at Edgbaston.
Jonathan Trott and Andrew Umeed have seen things through to stumps for the hosts after Will Porterfield went in James Anderson's second over.
The Bears still have plenty of hard work to do with the bat to make sure they stay in the game though.
Durham 197 v Worcestershire 210-4
Worcestershire close day one in a strong position after skittling Durham for less than 200 and then moving into the lead late on.
The Pears have dished out some serious punishment, scoring at almost five an over.
Brett D'Oliveira (91 not out) will resume with Moeen Ali (36 not out) in the morning.
Essex spinner Simon Harmer thinks he got more bounce and drift from the pink ball...
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There is County Championship cricket still going on at 9.44pm folks.
Anyone else feel a bit odd?
Nottinghamshire 135-3 v Kent 180
Another strong day for Division Two's leaders Nottinghamshire.
Kent are currently third and will be hot on their heels for promotion, but have been out-played on day one, with only Daniel Bell-Drummond's unbeaten 84 really putting up much of a fight to the hosts' bowling.
To complete things, Steven Mullaney finishes 63 not out alongside Alex Hales (28 not out). Notts are just 45 runs behind with seven first-innings wickets in-hand.
Essex 106-0 v Middlesex 246 - stumps
You really couldn't make it up. It's been a long and now very dark day for BBC London's Kevin Hand...
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Glamorgan v Derbyshire 288
I was just getting ready for bed and then Derbyshire decided to lose their last wicket.
Tony Palladino skied Michael Hogan to Graham Wagg at mid-off for 23.
It means Glamorgan have got to come out and bat for two overs tonight.
Northants 261 v Leicestershire 65-4
It's over at Northampton too, where Leicestershire will be relieved to get off the pitch four down. Nightwatchman number two, Clint McKay, did his job alongside Colin Ackermann.
Northants' day, after Ben Duckett's marvelous century and Max Holden's 92.
Essex 106-0 v Middlesex 246 - stumps
It's darkish at Chelmsford now...
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Sussex 358-9d v Gloucestershire 31-0
Sussex skipper Ben Brown declared to leave Gloucestershire a task and they've duly seen it through, with openers Cameron Bancroft (18 not out) and Chris Dent (7 not out) unbeaten.
They're 327 runs behind going into day two at Hove.
Warwickshire 11-1 v Lancashire 273
Warwickshire aren't going to take any risks this evening.
They're 11-0 off eight overs.
Five overs to survive, James Anderson is into his fifth over.
Essex 106-0 v Middlesex 246
Image source, Rex FeaturesIt's been another stellar day for Division One leaders Essex and their march towards a first County Championship title in 25 years.
After Simon Harmer took five wickets to bowl Middlesex out for less than 250, Alastair Cook and Nick Browne batted throughout the final session.
Essex trail by 140 with plenty of batting to come.
Hampshire 211-9 dec v Somerset 18-0
No such batting woes for Somerset at the Ageas Bowl as they reach stumps unscathed.
Marcus Trescothick and 20-year-old debutant Ed Byrom saw out the remaining six overs after Hampshire declared.
The forecast for the next couple of days in Southampton isn't looking great I'm afraid, but we'll keep our fingers crossed.
Warwickshire 3-1 v Lancashire 273
BBC Sport's Stephan Shemilt said Jimmy would fancy this - and there's his first wicket.
The seamer spears one into the pads of Will Porterfield and he's on his bike.
Warwickshire's batting woes of 2017 continue.
Yorkshire v Surrey 374-6
Image source, Getty ImagesYorkshire and Surrey, you win the medal for ending closest to the scheduled 9pm finish!
And it's been a very good day for the visitors, with fifties for Jason Roy and Kumar Sangakkara leading them towards maximum batting bonus points.
Plenty of hard work to do for Yorkshire - but they've got some talent in their batting line-up - Joe Root and Jonny Bairstow are okay aren't they?