Tom Banton looked as though he meant business, plundering three boundaries at the expense of debutant Charlie Bennett to move to 15 in quick time, only to then chip Amir to mid-on in the third over as Somerset lost their first wicket with 21 on the board.
There was no loss of momentum though, with Kohler-Cadmore and Smeed taking 16 off the next over, sent down by Thain, while Bennett again proved expensive when switching to the River End and Paul Walter conceded 19 off the sixth as Somerset raced to 67-1 by the end of the powerplay.
Essex turned to spin in an attempt to stem the flow, but Kohler-Cadmore struck a brace of sixes off successive deliveries from Matt Critchley and hit Luc Benkenstein straight for another to raise a blistering 24-ball half century in the grand manner.
The visitors did little to help themselves, Bennett dropping Smeed on 20 at deep mid-wicket off the bowling of Critchley.
Smeed had contributed 32 to a stand of 88 from 44 balls when he hit Benkenstein to long-off as the home side reached halfway on 114-2.
There was no let-up in the scoring rate, Kohler-Cadmore applying further pressure by hoisting Benkenstein for a towering six over long-off as the Essex bowling wilted in the face of heavy firepower.
Kohler-Cadmore was within 10 runs of what would have been a magnificent hundred when a loss of concentration saw him hit Simon Harmer high to long-off to afford Essex overdue relief.
Critchley removed Abell for 20, but there was precious little breathing space for the visitors, Sean Dickson and Lewis Gregory picking up the cudgels in a stand of 28 from 12 balls.
Required to score at 12.5 an over, Essex made a decent enough start, Walter taking Craig Overton for a six and two fours in a first over that yielded 15 runs.
But Meredith redressed the balance, clean bowling Michael Pepper with 28 on the board in the third.
Somerset struck another blow in the next over, Ben Green taking a startling diving catch at long-on to send back Jordan Cox and give Henry a wicket on his final appearance before returning to New Zealand, while Meredith accounted for Charlie Allison.
Henry then struck twice in three balls, removing Walter for 24 and Benkenstein without scoring to reduce Essex to 48-5, their prospects of pulling off an unlikely victory in tatters before the powerplay had even ended.
Critchley was run out by Abell’s direct hit and Lewis Goldsworthy had Robin Das held on the deep mid-wicket boundary with the score 81-7.
Only Thain attempted to carry the fight to Somerset, crashing a four and four sixes in a defiant 17-ball innings of 38, but his dismissal – caught by Henry at long-on off the bowling of Overton – signalled the end of meaningful Essex resistance.
Report by ECB Reporters’ Network, supported by Rothesay
