The Welsh side had declared on 442 for nine and then restricted their opponents' first innings to 142. Michael Thornely and Greg Smith were both unbeaten on 42 at the break.
Rain had caused a delay at that match and it also did so at Worcestershire's home contest against Gloucestershire, which was on day two.
The hosts, who had bowled out Gloucestershire for 234 and got to 65 without loss by the close of play on Wednesday, moved on to 114 for one, with their wicket falling at 90 when skipper Daryl Mitchell (63) was dismissed.
Also on day two was the match between Essex and Kent at Chelmsford, where the away side, having resumed on 20 for one in response to 212 all out, lost three more wickets on their way to 87.
On day one of their clash with Hampshire at Southampton, Lancashire won the toss, opted to bat and had 84 for two by lunch.