Graeme Hick mopped up the tail in dramatic fashion with the wickets of Vince Clarke, Darren Maddy and Alan Mullally in just five balls.
Worcestershire's only substantial innings came from their captain and opener, Tom Moody, who hit 52 off 76 balls.
An unbeaten 132 by Paul Pollard took Nottinghamshire to a six-wicket win. Chasing Somerset's 253 for 6, the biggest total of the day, he hit 14 fours and a six and shared stands of 69 in nine overs with Paul Johnson and 77 in 11 with Chris Cairns.
Yorkshire provided the day's other century-maker in Michael Bevan. His 103 (one six and 10 fours) from 108 balls took his side to 235 for 4. Gloucestershire were never in the hunt and Bevan's three late wickets gave Yorkshire a 93-run win.
Warwickshire, the defending champions, had Roger Twose to thank for their win over Essex on a superior scoring rate. When rain reduced the target from 202 to 160 off 31 overs the left-hander scored 47 from 61 balls. With four runs needed, Essex thought they had Twose caught in the gulley but the umpire ruled the ball did not carry.
After being dropped by England Mark Ramprakash hit an unbeaten 85 in an abandoned match at Lord's while Dominic Cork, the hero of the second Test, hit 57 to ensure Derbyshire beat Hampshire by five wickets.