Promotion hopefuls Yorkshire stuttered early on against Northamptonshire but managed to reach 76 for two after winning the toss at Wantage Road.
Adam Lyth could not follow up last week's double century heroics after making just six before he was seen off by David Willey while Joe Root (25) was caught behind off Oli Stone.
Phil Jaques and captain Andrew Gale ensured there would be no further collapses, with the former striking a four and a six in his 24 not out.
There was no play in Swansea, where Glamorgan are looking to move off the foot of the table with victory against Gloucestershire.
And only 8.3 overs were possible before lunch at Chelmsford as Essex reached 18 without loss after deciding to bat against Leicestershire.