Warwickshire will face Surrey in the Royal London One-Day Cup final at Lord's on September 17 after beating Somerset by eight runs in a thrilling semi-final at Edgbaston.
After choosing to bat, the home side amassed 284 for four, thanks to Ian Bell's unbeaten 94 from 90 balls and 86 from Sam Hain.
Peter Trego smashed a half-century to take Somerset to 145 for three before the innings was hit by four wickets, all lbw, in 12 balls from Jeetan Patel.
The New Zealander returned to end a thrilling counter-attack from Ryan Davies, who hit 46 from 33 deliveries, with yet another lbw decision to finish with five for 42 as Somerset's tenacious challenge fell just short at 276 for nine.
Warwickshire were given a solid start as openers Hain and Jonathan Trott, with 44, added 90 in 18.2 overs before the latter chipped a return catch to Roelof van der Merwe.
Somerset's bowlers took the pace off the ball well to prevent a mid-innings run-charge and Hain and Bell compiled 88 until Hain lifted Lewis Gregory to deep midwicket.
Tim Ambrose, who had a runner after straining a buttock muscle during his innings of 22, and Laurie Evans were caught at mid-on but Bell supplied late impetus with 16 off three balls from Van der Merwe.
Somerset soon lost their openers as Johann Myburgh inside-edged Chris Wright and was well-caught by Ambrose, his last act before being replaced by substitute wicketkeeper Alex Mellor, summoned from home in Stoke-on-Trent after Somerset graciously agreed to the switch.
Jim Allenby's run-a-ball 22 ended when he fell lbw to Oliver Hannon-Dalby.
Trego and Tom Abell, who made 35, added 75 in 18 overs and after Abell fatally top-edged a pull at Wright, Trego passed 50 for the 26th time in limited-overs cricket and celebrated with a six off Patel, only for the Kiwi to gain revenge with an lbw decision two balls later.
Three more leg-before verdicts quickly went Patel's way. Gregory and Van der Merwe paid for swinging across the line and Craig Overton copped an arguable decision first ball.
That left Somerset 161 for seven but 19-year-old Davies, playing only his sixth List A game, joined James Hildreth to add 71 in 10 overs.
Hannon-Dalby returned to have Hildreth caught at cover for 42, and when Patel returned to snare a fifth leg-before shout, against the reverse-sweeping Davies, last pair Tim Groenewald and Max Waller needed to find 51.
They took it down to 16 needed from the last six balls but Hannon-Dalby held his nerve to deliver a superb final over right up in the block-hole.
Source: PA
