Eight fixtures in Round Five of the season
Essex, Hants & Sussex all bowled out before tea
Durham & Derbyshire only two counties not playing in this round
James Anderson plays first game of season for Lancashire
Image source, BBC SportGloucestershire head to Lord's to take on Middlesex on the back of an unbeaten run and an impressive win against Leicestershire last round.
They have a 14-point lead over Somerset who take on third-placed Hampshire.
Surrey will hope to back up their emphatic first win of the season against Hampshire when they travel to winless and bottom of the group Leicestershire.
Image source, BBC SportNot much to separate these six sides so far with just 14 points between them.
Warwichshire have a slender lead but were well beaten by second-placed Durham last time out. Their chance to return to form comes against so-far unbeaten, but still winless Worcestershire.
County Champions Essex have some work to do after just one win so far from four and they travel to a Nottinghamshire side who finally ended their three-year wait for a win in the format last week.
Yorkshire v Kent 4-1
Yorkshire paceman Ben Coad has made a breakthrough in the first over at Headingley.
Kent skipper Daniel Bell-Drummond has edged him to slip and is on his way for four.
Bad start for Group Three's bottom side.
While games get into their rhythm, let's show you how things stand in the three groups at the start of this round....
Nottinghamshire v Essex - Notts won toss and elected to bowl
I spoke too soon!
Umpires and players were on their way out to the middle at Trent Bridge and then a rain shower blew in before the bails could rest on the stumps.
Hover cover is on and the players are off for the time being.
All set to get started in all our games except at Northampton where the weather looks like it's improving.
Eyes down and we're off!
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As ever, feel free to have your say on the action over the next four days by using #bbccricket
Who has been a surprise package so far this season in your opinion? Also, who needs to up their game or stake a claim for England selection?
Lancashire v Glamorgan (11:00 BST) - Glamorgan won toss and bat first
Looks like we're set for some James Anderson bowling from the James Anderson End today.
England's leading Test wicket-taker is poised to make his first County Championship appearance of the season as Lancashire host Glamorgan.
There's a full match preview below from our colleagues at BBC Sport Wales and the visitors have won the toss and will bat first.
James Anderson is named in Lancashire's 13-man squad to face Glamorgan, who are set to give Australian Michael Neser his debut.
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BBC local radio
As ever, we've got every ball or every match in this round covered for you by our colleagues from BBC local radio.
You can find the match of your choice by searching through the live coverage options at the top of this page.
BBC Radio 5 Live Sports Extra also has commentary throughout the day from Edgbaston of Warwickshire v Worcestershire on DAB Digital Radio and the BBC Sounds app.
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There's been some snow flurries in certain parts of the country this morning and potentially a few more still to come.
What are the prospects of play for today?
Well, the BBC Weather Centre radar can give us an idea of what to look out for.
May well be several interruptions.
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Image source, Rex FeaturesRather than nine matches, we've got eight on the way for you over the next four days. Here's what's in store:
Group 1:
Trent Bridge: Nottinghamshire v Essex - Nottinghamshire win toss and elect to bowl first
Edgbaston: Warwickshire v Worcestershire - Worcestershire win toss and elect to bowl first
Group 2:
Ageas Bowl: Hampshire v Somerset - Somerset win toss and elect to bowl first
Grace Road: Leicestershire v Surrey - Leicestershire win toss and elect to bat first
Lord's: Middlesex v Gloucestershire - Gloucestershire win toss and elect to bowl first
Group 3:
Old Trafford: Lancashire v Glamorgan - Glamorgan win toss and elect to bat first
Northampton: Northamptonshire v Sussex - toss delayed due to rain and bad light
Headingley: Yorkshire v Kent - Yorkshire win toss and elect to bowl first
Image source, Rex FeaturesHello and good morning.
The County Championship is back once again for its next instalment in this new format.
We're already into round five and starting to see who may be among the title contenders.
There are eight fixtures starting from this morning and some international-class names set to be in action once again.
Let's build up the action for you.