Bay lie 22 points adrift at the Premier basement after a disappointing home loss to Rainhill on Saturday.
Put into bat, the Bay were bowled out for just 70, no-one managing to score 20 or above, with Khalid Usman taking 4-23 and Jamie Harrison 3-8 for the visitors.
Rainhill reached 72-4 in 20.4, Matt Russell collecting 2-22 and recording a run out for the hosts.
After inviting the visitors to bat, Prestatyn were left facing a huge target at Beach Close.
Parkfield Liscard amassed 228-7 declared off 39.5 overs, Adnan Khald making 116, while Nauman Ahmad bagged 3-5 and skipper Adam Tidswell 2-57 for the home side.
In reply, Prestatyn were blown away for just 79, David Harris top-scoring with 25, Naveed Saleh with best bowling for Parkfield, grabbing 3-9.
All of Northop Hall’s last six completed league games have ended in victory for the Flintshire side.
Their latest success on Saturday at Whitefield was a close and hard-fought contest.
The hosts were put into bat and bowled out for 183 in 48.3 overs, Paul Jenkins taking 4-76 off 24 overs, Carwyn Johnson 3-55 and James Hurlin 2-37.
In reply, Hall slipped from 74-1 to 83-4, but a fifth-wicket stand of 80 between skipper Ben Slater (40) and Hurlin (39) put them on course for victory.
Opener Jac Kennedy had earlier made 45 and a six from Jenkins – his sole scoring stroke – brought the target closer before the visitors got home on 184-8.
Samuel Costley’s half-century and five-wicket haul helped unbeaten Bay establish a 32-point lead at the summit after Saturday’s 54-run success at Ainsdale.
Costley made 52 and opener Joshua Brown 46 as the visitors posted 189-9 after winning the toss and opting to bat.
Despite a dominant 89 from Kyle Marshall, Ainsdale could only manage 135 all out in response, Costley 5-56 off 19 and Brown 2-3.
Adam Littler top-scored with 49 as Northop Hall seconds set 179-8 declared at home to Highfield seconds having been put into bat.
The visitors clung on for a draw at 144-9, Liam Evans-Ford 5-45, Sion Hellen 2-27 and Ben Ardan 2-41.
Opener Jason Edwards topped the batting chart with 56 in Prestatyn seconds’ effort of 104 all out on Merseyside, Pasidu Jayaranjana poaching 5-33 for Parkfield.
The Pembertons Meadow hosts responded with a winning 104-2 off 17.5, Ben Williams 2-38.
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