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Dane Vilas hits 124 and Luke Wells 97 as Lancashire build a big lead against Middlesex.
Nottinghamshire close on 177-5 after following on against Kent at Canterbury.
No play possible on day three at Edgbaston between Warwickshire and Northamptonshire.
Sussex declare on 344-9. Leicestershire close on 221-3, chasing 499 to win.
Glamorgan close on 120-2 after following on against Yorkshire in Cardiff.
Derbyshire close on 398-9 in reply to Gloucestershire's 377 at rain-hit Bristol.
Kent 446 v Notts 265 & 100-5 f/o
Joey Evison bowls a rare loose ball, angled into leg stump and that runs away off the pads of Lyndon James for four runs.
Notts have their innings 100 in the 47th over.
They're still 81 in arrears.
Glos 377 v Derbys 398-9
Er, Pat Brown won't bat just yet.
The umpires have taken another light meter reading and we're off.
Just four balls in the session. Four!
Not without incident though, as Gloucestershire grabbed a third bowling point off the last ball of the 110th over and Ed Middleton has his first wicket at first-class level.
Lancashire 259-4 v Middlesex 194
A lovely steer through the covers from George Bell picks up four and Lancashire's first batting point.
He goes for an expansive drive next ball and gets four more through a vacant third/fourth slip area.
Northants 250, Warwickshire 142-4
It's official!
That is it for the day in Birmingham.
Umpires Rob Bailey and Neil Pratt went out for an inspection, took a look at the wicket, the outfield, the depressing sky over the city centre and the falling drizzle, then went back in to have a quick think - and they have now called it off.
So there will be no play today at Edgbaston.
Glos 377 v Derbys 398-9
Well, here's the strategy laid bare.
Ed Middleton is round the wicket and Watt aims a flashing drive outside off and inside edges to square leg for no run.
Got hold of it this time! Driven through cover for four.
The field is spread deep with five on the boundary.
Down the pitch...missed, fumbled and then stumped by James Bracey!
That's Ed Middleton's first wicket in first-class cricket and Gloucestershire have a third bowling point.
The last batter is Pat Brown...
Northants 250, Warwickshire 142-4
Umpres Rob Bailey and Neil Pratt are yet to deliver their final verdict.
But the full covers are being dragged back on at Edgbaston.
And it is now drizzling again.
Lancashire 248-4 v Middlesex 194
The skies have brightened at Old Trafford and the players are back on the field.
We have lost three overs because of that bad light.
There are 27 left to be bowled.
Sussex 262 & 344-9 dec v Leicestershire 108 & 143-3
Colin Ackermann moves up a gear again as he helps himself to three boundaries in an over off Fynn Hudson-Prentice.
Throw in a no-ball and that's 14 off the over.
Ackermann has now reached 72.
Glos 377 v Derbys 394-8
Here we go.
Mark Watt will face Ed Middleton and he'll try to get his captain Leus du Plooy back on strike.
Four balls left in the 110th over.
Derbyshire need six runs for a fourth batting point.
Gloucestershire need one wicket for a third bowling point.
Kent 446 v Notts 265 & 93-5
Lyndon James tries to get Aron Nijjar away through cover as the spinner loops one up and invites the drive through cover.
Another maiden over.
Glos 377 v Derbys 394-8
Weather permitting. We have to say it, sorry.
Nine more overs lost.
Derbyshire will have four balls left to score six runs and earn a fourth batting point.
Kent 446 v Notts 265 & 93-5 f/o
Lyndon James is eaving Joey Evison outside off and it does feel like a question of when rather the if for Kent.
There is after all a full day's play tomorrow, weather permitting.
James picks up a single off the fourth ball and Joe Clarke nearly nicks one as he follows a ball outside the line.
Sussex 262 & 344-9 dec v Leicestershire 108 & 129-3
Sussex's bowling has been tight since tea where they have only conceded six runs off seven overs.
But Umar Amin times one nicely off Jack Carson for four welcome runs.
And he then gets a legside full toss. Thanks very much! Four more.
Northants 250, Warwickshire 142-4
Umpires Rob Bailey and Neil Pratt are coming out for a look at Edgbaston.
It hasn't rained now for a while.
But the skies over Birmingham city centre still look very threatening!
Kent 446 v Notts 265 & 92-5 f/o
Aron Nijjar is bowling an immaculate line and length to Lyndon James, who defends.
The good news (for Kent at any rate) is the forecast has improved considerably and we have a good chance of a full session of play.
Lyndon James defends solidly at the other end. Maiden over.
The deficit is 89.
Lancashire 245-4 v Middlesex 194
We said it was gloomy...
After six balls from Jayant Yadav, the umpires take a light reading and the players are coming off.
Lancashire 248-4 v Middlesex 194
The players have returned to the field, where it has got very gloomy.
We have a possible 31 overs to go and Middlesex need wickets.
Kent 446 v Notts 265 & 90-5 f/o
Lyndon James edges Joey Evison, but it doesn't quite carry to Jack Leaning at second slip.
He runs a single - and Joe Clarke gets a more comfortable run with a neat defensive push into the off side.
We have 27 overs left tonight.
Kent 446 v Notts 265 & 88-5 f/o
Maiden for Joey Evison.
Aron Nijjar will bowl the next over.
He's had a great debut for Kent, taking four wickets in the first innings.
Lyndon James gets a single to deep extra cover and Joe Clarke defends.
Yorkshire 500, Glamorgan 273 & 35-2
Nick Webb
BBC Radio Wales
Yorkshire are eight wickets short of victory in Cardiff after forcing Glamorgan to follow on 227 runs in arrears, with Matt Revis claiming a first-innings five-wicket haul and Ben Coad also causing havoc in the home ranks.
The new ball did the trick in style after lunch, as Coad trapped Dan Douthwaite lbw for 37 with his first delivery, then produced a jaffa to bowl James Harris off-stump next ball.
But the visitors changed the bowling and opted for some ill-advised tactics as the 10th-wicket pair of Andy Gorvin (47) and Jamie McIlroy (30 not out) were able to settle in and then prosper for career-bests.
Both hit their first sixes in the first team in a stand of 56 to bring an unexpected bonus point, before Revis cleaned up Gorvin's stumps to celebrate his five-for.
With 145 overs to win the match, Yorkshire made early inroads second time round as Coad had Zain Ul Hassan caught at slip without scoring and Colin Ingram (14) edged Bess to slip.