Somerset are 232 for six replying to Yorkshire's 450 for five declared after three days at Taunton.
After three days at New Road, Worcestershire are none without loss in their first innings replying to Essex's 215.
Gloucestershire are 143 for four replying to Lancashire's 310 after two days at Aigburth.
Leicestershire are 74 for four after two days against Kent at Tunbridge Wells.
Hampshire are 149 for five after two days against Northamptonshire at Wantage Road.
@EssexCricket on Twitter: WICKET - Tom Westley skies Shantry to mid-on and is caught by Chris Russell for 90. Essex 209 for 9
5:05pm - Hampshire, tackling Division Two leaders Northants, lose a further wicket as Wheater falls to Trent Copeland, while Mahmood – having reached an impressive half-century – is bowled by Worcestershire’s Jack Shantry for 54.
Derbyshire have taken their total beyond 100 and remain just two down against Sussex.
4:52pm - Dawson brings up a 165-ball fifty for Hampshire with his eighth four.
It might not be long before Sajid Mahmood has a half-century to his name as well. The former Lancashire paceman is 41 not out as Essex's fightback continues.
@CricketingBears on Twitter: It's thumping down again at Hove
4:36pm - Derbyshire may have lost two early wickets, but a brisk third-wicket stand between Wayne Madsen and Shivnarine Chanderpaul is repairing the damage. Shiv has 30 from 29 balls!
Meanwhile, Northants and Hampshire are back on and so are Essex and Worcestershire.
4:32pm - It's a time for celebration on both sides of the Pennines.
Yorkshire's Ryan Sidebottom has Elgar caught at point to put Somerset in a spot of bother at 120 for four.
At Aigburth, Glen Chapple grabs first-class wicket number 901 by trapping Chris Dent lbw.
4:22pm - Essex are 173 for seven as tea is taken.
4:15pm - Westley and Sajid Mahmood have now put on 52 for Essex's eighth wicket at New Road, the latter striking five fours.
Dawson continues to play the anchor role for Hampshire, while the more positive Adam Wheater has dashed to 37 from 35 deliveries. Sadly, bad light has forced another delay with Jimmy Adams' side on 134 for four.
@hantscricket on Twitter: We've resumed at Wantage Road. Hants 115-4. Dawson 47*, Wheater 23.
4:05pm - Time for tea at Aigburth and Taunton.
4:03pm - Surrey strike again as Tim Linley snares Billy Godleman for 17.
3:51pm - Just as we pressed publish on that last update, Trescothick fell lbw to Richard Pyrah for 74. Somerset are now 103 for three.
3:50pm - Somerset are into three figures at Taunton and Trescothick has almost 75% of their runs.
Westley is doing his best to keep Essex afloat at New Road, while Derbyshire and Gloucestershire have settled things down following early setbacks.
Play is set to resume shortly at Wantage Road.
@SussexCCC on Twitter: Currently raining here at Hove, covers are on. No news on the toss as of yet!
3:28pm - Well done Glen Chapple! He reaches the landmark of 900 first-class wickets by having Gloucestershire captain Michael Klinger held in the slips for two.
Tom Westley has passed 50 for Essex, but there will be no big innings from Graham Napier today. The all-rounder has fallen to the irrepressible Shantry for 12.
At Taunton, Trescothick has been joined by new overseas signing Dean Elgar.
@hantscricket on Twitter: Bad light stops play at Wantage Road after Wheater gets hit on the helmet. Hampshire 114-4. Dawson 46*, Wheater 23*.
3:17pm - Derbyshire opener Chesney Hughes, the subject of an exclusive interview on ecb.co.uk today, has been bowled by Chris Tremlett for a golden duck.
@LancsCCC on Twitter: All eyes on Glen Chapple who needs one more wicket to reach 900 in his first class career. Dent and Klinger to open for Glos
3:15pm - Trescothick has a fifty for Somerset, while play is finally under way at Derby. Huzzah!
3:03pm - It's all going wrong for Essex. Buoyed by the breakthrough in his previous over, Shantry has ousted Ben Foakes and James Foster for ducks with successive balls.
Somerset are two down following Lewis Gregory's departure to Steven Patterson. Marcus Trescothick has 43 of the Taunton side's 52.
Hogg's defiant knock comes to an end on 46 as he becomes a sixth victim for Miles. That means Lancashire's topsy-turvy innings is over at 310.
2:56pm - Away from the county scene, New Zealand have confirmed Ian Butler will replace the injured Trent Boult in their squad for the NatWest Series with England. Boult has a torn muscle in his side and is set to be out for six to eight weeks.
@hantscricket on Twitter: Attack is the best form of defence. Wheater hits Copeland for a four then a six in consecutive balls. Hants 90-4.
2:50pm - Derbyshire have won the belated toss at Derby and will bat first against Surrey. Young batsman Ben Slater makes his debut for the hosts, while the visiting line-up contains a certain RT Ponting.
A partnership of 59 is brought to an end at New Road as Ryan ten Doeschate falls to Jack Shantry for 30.
Lancashire have passed 300, thanks largely to Hogg.
@LancsCCC on Twitter: PARTNERSHIP!! - Hogg (35*) and Kerrigan (17*) bring up their 50 partnership. Lancs 294-9 after 80 overs.
2:44pm - There will be no play today at Tunbridge Wells.
Hampshire lose a fourth wicket as Copeland pins Sean Ervine in front with the score on 80.
Lancashire's first innings continues. Hogg and Kerrigan have now put on 44 and a third batting point is in sight.
2:32pm - They are back on at Taunton, while Gloucestershire are being frustrated by Lancashire's 10th-wicket pair - Kyle Hogg and Simon Kerrigan.
2:22pm - Play has resumed at New Road, where Essex are currently 64 for three.
2:18pm - Hampshire continue to rebuild. Liam Dawson takes his side to 50 with a crisply struck boundary.
2:11pm - Play was due to resume at 2:10pm at Tunbridge Wells. However, the rain returned just as the players entered the field.
@derbyshireccc on Twitter: GOOD NEWS! Play will start at 3.15pm at TCG between Derbyshire and Surrey in the LV= County Championship. Toss and team news to follow...
2:07pm - Trescothick crashes a couple more boundaries to the fence, but his momentum has been stopped by the rain. The players are now leaving the field.
@LancsCCC on Twitter: Batting bonus point no.2 in the bag after Hogg drives McCarter through point for three runs. Lancs 251-9 off 68 overs. Hogg 15* Kerrigan 2*
2:00pm - Gloucestershire continue to enjoy success. Craig Miles now has five wickets after removing Glen Chapple for 14.
1:57pm - Trent Copeland strikes again, removing James Vince lbw. Copeland's figures make for impressive reading at the minute.
Somerset lose their first wicket, Steven Patterson trapping Arul Suppiah lbw.
1:52pm - Marcus Trescothick has struck a couple of boundaries since lunch, to move his side on to 30 without loss.
1:41pm - Play is back under way at Taunton, Aigburth and Wantage Road.
@leicsccc on Twitter: Play due to start at 2.10pm. Weather permitting!
1:04pm - Time for lunch at Taunton, Aigburth and Wantage Road. The game at Derby has yet to start and they were already off at Tunbridge Wells and New Road.
Here are the scores from around the country:
Somerset are 15 without loss in reply to Yorkshire's 450 for five declared on day three at Taunton.
Play has yet to begin on day one of the match between Derbyshire and Surrey at Derby.
Lancashire are 232 for eight against Gloucestershire on day two at Aigburth.
Hampshire are 30 for two on day two of the match with Northamptonshire at Wantage Road.
On day three at New Road, Essex are 59 for three against Worcestershire.
There has been no play as yet on day two at Tunbridge Wells, where Leicestershire are 74 for four against Kent.
12:55pm - Miles has Croft caught behind for 62 as Lancashire's slide continues.
12:47pm - Hampshire's progress remains painfully slow; after 21 overs, the visitors to Northampton are 23 for two. Copeland boasts figures of 10-6-7-1.
Somerset openers Trescothick and Arul Suppiah have each survived early appeals.
@yorkshireccc on Twitter: It's raining pretty steadily, but the players getting ready to play. Sidebottom to Trescothick.
@EssexCricket on Twitter: No more play before lunch which will be taken at 12.45 p.m. Essex 59 for 3.
12:35pm - Wayne White departs without scoring, meaning Lancashire have lost three wickets for two runs to be 211 for seven. Half-centurion Steven Croft has watched the flurry of wickets from the other end
12:29pm - Adil Rashid is in serious form. The Yorkshire all-rounder makes it three hundreds in as many first-class innings with a four off Craig Meschede. Andrew Gale promptly declares on 450 for five, Hodd unbeaten on 68.
Gareth Cross has fallen cheaply to James Fuller at Aigburth, while bad light has once again forced a stoppage in the fixture between Worcestershire and Essex.
12:22pm - There will be no ton for Katich! The Australian has been held in the slips off Craig Miles, leaving Lancashire 209 for five.
Ryan ten Doeschate is counter-attacking for Essex, who are 54 for three.
12:20pm - The rain appears to have eased at Taunton, where Rashid is closing in on a second century against Somerset this month.
Northants have kept the squeeze on Hampshire and been rewarded with a second scalp, Michael Carberry caught at second slip off Trent Copeland.
Lancashire have moved beyond 200 and Simon Katich is now just four shy of a hundred.
@yorkshireccc on Twitter: Unfortunately it has started raining. Play continues for now. 406-5 after 111
12:06pm - Yorkshire have picked up their fifth and final bonus point with a ball to spare, while Roses rivals Lancashire are back under way at Aigburth.
That man Richardson has struck again for Worcestershire, bowling Mark Pettini for 12 to leave Essex 36 for three.
Derby will witness a further inspection at 2pm.
11:55am - Hodd makes the most of his let-off by moving to 50 from 84 balls, although he is then dropped again by Marcus Trescothick.
Runs are proving hard to come by for Hampshire, who have just eight on the board after six overs.
@yorkshireccc on Twitter: Hodd dropped at first slip by Trescothick on 41. 387-5 now. 13 runs needed in 16 balls for fifth batting point.
11:50am - Another positive weather update arrives from Aigburth. The match between Lancashire and Gloucestershire is set to resume at 12pm. Eight overs have been lost due to this morning's brief delay.
11:44am - Rashid and Andrew Hodd take their partnership into three figures at Taunton. Yorkshire are firmly on course for maximum batting points and a healthy first-innings total.
Happily, the players have returned to the field at New Road.
@derbyshireccc on Twitter: There will be an inspection at 12 noon at TCG. Rain has stopped but it is still very wet.
11:37am - Yorkshire are still going along nicely, but Hampshire have already lost skipper Jimmy Adams, caught behind in the first over.
11:33am - As the game at Wantage Road belatedly begins, Northants confirm former England batsman Allan Lamb has joined their board of directors. We'll have further details on ecb.co.uk shortly.
@hantscricket on Twitter: Team news is that Adam Wheater is back from injury in place of Michael Bates and Michael Roberts comes in for the out-going George Bailey.
11:29am - There is further frustration for those in attendance at New Road. Bad light has stopped play with Essex 22 for two.
11:14am - Yorkshire pick up their fourth batting point as Adil Rashid moves his own score past 50. The White Rose county have a further 11 overs to get the 48 runs they need for an extra bonus point.
Alan Richardson has ousted Essex debutant Nick Browne, who was lbw offering no shot.
Meanwhile, Northants have won the toss against Hampshire and will bowl first, with play set to begin at 11:30am.
@yorkshireccc on Twitter: Just one off the first over of the morning. 342-5 (96 overs). Could be a race for a fifth batting point. 58 runs in 14 overs needed.
11:03am - In addition to the delay mentioned below, there will be no play before lunch at Tunbridge Wells and a late start at Wantage Road.
However, play is under way at Taunton and New Road.
@LancsCCC on Twitter: It's raining so the umpires are unable to inspect, so we are looking at a delayed start I'm afraid.
10:42am - The game between Derbyshire and Surrey, who have just had Jade Dernbach called into England’s NatWest Series squad, is scheduled to start at noon.
Here is a look at how things stand in the other fixtures, which have all been affected by rain to some degree:
Yorkshire are 341 for five in their first innings against Somerset after two days at Taunton.
After two days at New Road, Essex are nine for one in their first innings against Worcestershire.
Lancashire are 175 for four at the start of day two against Gloucestershire at Aigburth.
Leicestershire were restricted to 74 for four on the opening day against Kent at Tunbridge Wells.
Northamptonshire and Hampshire were unable to start their match at Wantage Road yesterday due to rain.
10:30am - Morning everyone. We have six LV= County Championship matches to keep you updated on today, although it looks as though there could once again be a few weather-enforced interruptions across the country.
In addition to the half-dozen first-class matches taking place, Sussex Sharks host Warwickshire Bears in the Yorkshire Bank 40 this evening.