There's a lot of cloud overhead at The Oval, including one or two dark ones.

Assuming it doesn't rain, this is going to be one heck of a chase if Surrey manage to pull it off - and serve as a warning to any other side audacious enough to think of denying them a fourth successive title.

Rory Burns is 17 not out, Dom Sibley has 11 and Jamie Porter will bowl the day's opening over for Essex.

BBC Sounds

You can follow every ball of every County Championship match with the BBC this summer.

Along with our live text coverage our BBC Local Radio and 5 Live Sports Extra commentary teams will be out in force to ensure you do not miss a thing.

You can listen via the BBC Sport website and app but also on most smart speakers - just ask BBC Sounds to play the game you want but also state the day as well.

For example, ask for 'Yorkshire against Nottinghamshire, day four'.

Image source, Rex Features

An exciting run chase is in store on day four at New Road as Worcestershire attempt to chase down a rather imposing target of 327, set largely thanks to two classy innings from Warwickshire's Sam Hain (86 and 87 not out).

The hosts ended the third day on 54-2 after play was remarkably resumed at 19:10 BST following a 40 minute stoppage for bad light.

With Warwickshire's two Chris's - Woakes and Rushworth - finding a consistent line and length on a capricious pitch, the Bears go into the final day of this local derby as overwhelming favourites but, so far, wicketkeeper batsman Gareth Roderick and Kashif Ali have shown the steeliness and determination at the crease for this match to be far from just a formality.

An intriguing final day beckons with an additional factor of some rain in the forecast over Worcester today as well.

Image source, Rex Features

Ben Coad admitted there were tired bodies in the Yorkshire dressing room ahead of day four after a gruelling run of seven early season County Championship rounds.

But the seamer insisted he and his teammates will “give everything” they have left as they try to salvage points against table toppers Nottinghamshire at Headingley.

Yorkshire need 287 runs to win with only five wickets still standing – a situation Coad admits leaves them in a tight spot.

“We fought hard with the ball with some tired bodies,” he said. “It’s been a heavy schedule these last seven games. We put our all in there and fought hard with the bat as well.

“It was a bit frustrating to lose a few more wickets than we’d have wanted at the end, and it wasn’t where we wanted to end up.

“We’ll give it everything tomorrow. We’re obviously behind the eight-ball, but we’ll keep going and see what we can do.”

Notts assistant coach Paul Franks paid tribute to Dillon Pennington, whose breakthrough with the last ball of day three has given them sight of Yorkshire’s tail as they chase a fourth win of their campaign.

“I’m really pleased for Dillon. He’s had to put some work in to get that wicket of [Harry] Duke. He fully deserved it.”

Just a quick reminder that it is Finals Day today in the Women's T20 County Cup at Taunton.

It's Surrey against the Bears and Lancashire Thunder versus The Blaze in the two semis, with the final scheduled to start at 18:45 BST.

You can listen to commentary by clicking here.

Image source, Rex Features

Essex batter Charlie Allison is hopeful they can push on for victory at The Oval today after his 140 allowed them to set reigning champions Surrey a huge target of 418.

The 20-year-old had never before scored more than 28 in a first-class innings, but hit two sixes and 19 fours in his superb 235-ball innings.

"This is my sixth match at this level and I’d yet to get to 50 so to go on and make a hundred was a real thrill. To do it at such a great ground like the Oval, and in the very first match I’ve ever played here, is also very special," Allison said.

“The pitch was definitely a bit slower than it was earlier in the game but there is still something in it for the bowlers and I’d like to think we have enough runs on the board and that we can go on to win the match."

Image source, Getty Images

Derbyshire skipper Wayne Madsen wants more of the same from his bowlers as they look to wrap up a second win of the season on the final day against Kent.

They were able to enforce the follow-on during day three despite Ben Compton's 156 and then picked up three wickets in the visitors' second innings before the close.

"We brought our energy and consistency with the ball and I thought the guys were fantastic. Nudge [Anuj Dal] in particular in the first innings, the control he brought for us and with that came the wickets," he said.

"The fact that we've got five seamers in our ranks is what makes it a little bit easier. The guys can share the load with Jack (Morley) and Dave (Lloyd) to help out, so we have the bowlers to be able to go back-to-back and we want to make sure we're clinical tomorrow."

Image source, Rex Features

Australia all-rounder Cameron Green has backed Gloucestershire to chase any target they are set on the final day at Wantage Road.

Bottom-of-the-table Northamptonshire will resume with a 248-run lead, and the visitors still have to take six wickets, with in-form Saif Zaib and James Sales together overnight.

"We’ll be pushing for wickets early, but we’re confident in terms of a chase, 100%. The wicket isn't deteriorating quite as fast as other wickets can do," said Green, who made 118 not out in the first innings.

"So, yeah, always back yourself to score the runs. I think we had a tricky chase last week against Kent and got it done."

"Today looks likely to remain windy and turn increasingly cloudy, with a growing risk of showers, and some longer spells of rain are expected to develop from the west during the day" - BBC Weather summary.

Division One

Surrey 279 & 32-0 v Essex 217 & 479

Surrey need another 386 with 10 wickets standing

Worcestershire 181 & 57-2 v Warwickshire 227 & 280

Worcestershire need another 270 with eight wickets standing

Yorkshire 159 & 176-5 v Nottinghamshire 228 & 393-8 dec

Yorkshire need 287 to win with five wickets standing

Division Two

Derbyshire 587-5 dec v Kent 326 & 157-3 (f/o)

Kent trail by 104 with seven wickets standing

Northamptonshire 469 & 158-4 v Gloucestershire 379-8 dec

Northants lead by 248 with six wickets standing

---Sunday results---

Durham 277 & 159 v Somerset 172 & 267-3

Somerset won by seven wickets

Hampshire 154 & 165 v Sussex 297 & 23-1

Sussex won by nine wickets

Glamorgan 383 & 8-0 v Middlesex 155 & 235 (f/o)

Glamorgan won by 10 wickets

Leicestershire 457 v Lancashire 206 & 248

Leicestershire won by an innings and three runs

Image source, Rex Features

We started round eight with nine games - and now there are five.

Who will follow the lead of Sussex, Somerset, Glamorgan and Leicestershire and go into the month-long County Championship break with a victory behind them?

Division One leaders Notts are in a strong position against Yorkshire, but Worcestershire and Surrey are both facing tough targets.

Welcome to our coverage. Play is scheduled to start at 11:00.