Adam Lyth & Jonny Tattersall score 100s for Yorkshire against Surrey
Gloucestershire bowled out for 136 by Essex; Simon Harmer takes 5-44
Lewis Goldsworthy scores maiden Championship hundred for Somerset v Lancashire
Opener Emilio Gay hits 112 for Northamptonshire against Kent
Kyle Abbott takes 5-45 as Hampshire bowl out Warwickshire for 217
D2 leaders Nottinghamshire dismiss Glamorgan for 318 in Cardiff
Tom Alsop hits career-best equalling 150 for Sussex against Leicestershire
Chris Rushworth takes seven wickets for Durham, Derbyshire's Leus du Plooy hits century
Middlesex all out for 188 against Worcestershire at Merchant Taylors' School
Essex v Gloucs 126-8
Image source, Rex FeaturesZafar Gohar has clearly decided there is little point in just hanging around.
He swings the first ball of a new Shane Snater over for four over mid-wicket and two deliveries later pulls the paceman away for six.
It's going to take a lot more of that, though, if Gloucestershire are to get anywhere near a batting point.
Kent v Northants 110-2
Emilio Gay has lost his partner after a century stand.
But here goes to his fourth fifty of the summer.
This in 108 balls with eight fours.
Can he now kick on, a season's best of only 70 for him.
Waite c Jacks b Worrall 15 (Yorkshire 125-5 v Surrey)
This deluge of wickets shows no sign of relenting.
Dan Worrall produces a little bit of extra lift at Scarborough and Matthew Waite edges to second slip where Will Jacks takes the catch in front of his face.
Division One leaders Surrey now well on top.
Rhodes c Holland b Abbott 2 (Hampshire v Warwicks 91-4)
Will Rhodes is squared up by a fine delivery from Kyle Abbott and Iain Holland takes a fine low catch at gully.
Following the loss of Dom Sibley, this has not been the start to the afternoon that Warwickshire wanted.
Kent v Northants 109-2
But it's fifty and out for Ryan Rickelton.
He follows a full ball sent across him from Matt Milnes and nicks behind.
He's really annoyed as he turns and walks off, knows plenty of runs were there for the taking.
Much-need partnership breaker for Kent.
Kent v Northants 103-1
Ryan Rickelton the first to his half-century after lunch, in 86 balls as he drives a couple past mid-off.
Eight boundaries in his innings.
T Price c Beard b Harmer 6 (Essex v Gloucs 115-8)
Tom Price slogs Simon Harmer for six, but the next ball turns a bit and he jabs a catch to Aaron Beard at short mid-wicket. Harmer now has 4-41 and the Gloucestershire innings is in freefall.
Image source, Rex FeaturesSussex have lost their first wicket at Hove with Ali Orr lbw to spinner Callum Parkinson for 70 - they are 149-1 after 29 overs against Leicestershire. Cheteshwar Pujara is the new batter.
Durham's Chris Rushworth is on a hat-trick against Derbyshire, having dismissed Brooke Guest and Hilton Cartwright with the final two balls of his latest over - the visitors are 85-5 in the 32nd.
Middlesex are 89-6 against Worcestershire, with Luke Hollman on 25, while Glamorgan have added 11 without loss since lunch and are 114-3 in the 34th over against Notts.
Yorkshire 116-4 v Surrey
Jamie Overton strains for a yorker, but the line is wrong and Matthew Waite flicks it away fine for four runs. He is 10 not out and Adam Lyth has 43, having not yet added to his score at lunch.
Sibley c Brown b Barker 56 (Hampshire v Warwicks 88-3)
On such a scorching day, it's certainly raining wickets at the moment.
Dom Sibley pushes forward defensively to a ball from left-armer Keith Barker but it does enough to find a thin edge and it's a comfortable catch for keeper Ben Brown.
Sibley faces 96 balls and hit 11 fours in his innings - and he has now been replaced by Will Rhodes.
Van Buuren run out 34 (Essex v Gloucs 106-7)
Image source, Rex FeaturesYou don't want to do that to your captain.
Graeme van Buuren drives to cover and sets off for a single, partner Zafar Gohar doesn't budge and GVB is run out by the length of the pitch.
A poor morning for Gloucestershire just got a whole lot worse.
Luxton c Foakes b Jacks 31 (Yorkshire 106-4 v Surrey)
First ball after lunch at Scarborough isn't an especially threatening one from Will Jacks - but Will Luxton somehow nicks a leg-side catch to wicketkeeper Ben Foakes. Great start to the afternoon for the Division One leaders.
It's been a bit busy at Hove during the lunch interval.
Brilliant to see so many children, though, out there enjoying themselves.
Image source, Rex FeaturesGlamorgan 103-3 v Nottinghamshire - lunch
Nick Webb
BBC Radio Wales
Glamorgan and Notts go into the afternoon session with the game evenly poised after Steven Mullaney’s surprise decision to bowl first.
Home skipper David Lloyd, short of red-ball runs, fell for six to Luke Fletcher to give the bowlers some encouragement on what looked like a good batting pitch.
Colin Ingram looked to be well set after smacking five consecutive boundaries with a series of elegant drives, while the more cautious Eddie Byrom broke out to smash a six over mid wicket.
But Ingram edged Brett Hutton on 34 to stand-in keeper Joe Clarke, while Byrom fell over a full-length ball from Dane Paterson to be trapped lbw for 24.
This looks like an important match for Glamorgan’s promotion hopes having been the only side to beat Notts so far, while the visitors have to cope without three key men in Ben Duckett (England Lions), Tom Moores (illness) and James Pattinson (paternity leave).
In case you missed it, there was a notable signing announced by Middlesex earlier this morning. He is playing at Merchant Taylors' School but having to wait for his chance as they are batting.
Middlesex sign experienced India fast bowler Umesh Yadav for the rest of the 2022 county season.
Read MoreLancashire v Somerset 89-3 - lunch
Anthony Gibson
BBC Radio Somerset
Both sides will have taken something from this morning's cricket: three wickets for Lancashire; encouraging knocks for Somerset's Tom Lammonby and George Bartlett, who was looking a million dollars in his first Championship match of the season until he was late coming down on a yorker from Jack Morley's slow left arm, the ball creeping under his bat and onto the stumps.
With a good crowd providing a seaside festival atmosphere, this is county cricket at its most characteristic and, some would say, its best.
Division One
Essex v Gloucestershire 104-6
Hampshire v Warwickshire 87-2
Kent v Northamptonshire 95-1
Lancashire v Somerset 89-3
Yorkshire 106-3 v Surrey
Division Two
Durham v Derbyshire 83-3
Glamorgan 103-3 v Nottinghamshire
Middlesex 76-6 v Worcestershire
Sussex 138-0 v Leicestershire
Essex v Gloucestershire 104-6
Essex well on top at Chelmsford where Gloucestershire have failed to make the most of winning the toss and choosing to bat.
Graeme van Buureh is 34 not out but Simon Harmer has 3-31 from 10 overs for the home side, with the other three wickets shared between Jamie Porter and Aaron Beard.
The visitors are bottom of the table and badly in need to their tail producing some lower order runs.
Yorkshire 106-3 v Surrey
A stylish end to the morning as Adam Lyth pushes Jamie Overton's final delivery through the covers for four.
Lyth has 43 not out and has added 48 with Championship debutant Will Luxton since the departure of Will Fraine for 14.
Luxton is on 31, having survived a chance to second slip and being caught off a no-ball.
Hampshire v Warwickshire 87-2
Dan Mousley helps himself to three off Liam Dawson and the final scoring shot of the morning is a single for Dom Sibley, who ends the session with 55 not out off 87 balls.
It was a very unSibley-like dash at the start of his innings and he has found the boundary 11 times - some of them, though, off the edge.
An even session, but a couple of early wickets this afternoon and Hampshire will feel they are getting the upper hand.