Postpublished at 17 overs
Somerset 129-7
Tom Curran concedes just five off the over, Somerset have lost any momentum they had.
Somerset all out for 145 from final ball of their 20 overs in the final; Sean Dickson top scores with 53
Matt Henry and Ish Sodhi share seven wickets as Somerset bowl out Essex for 131 to win by 14 runs
Essex beat holders Hampshire by five wickets (DLS Method) in first semi-final
Joe Weatherley hits unbeaten 63 to help Hants post 170-7
Essex reach revised 12-over target of 115 after rain, with three balls to spare
Somerset beat Surrey by 24 runs in second semi-final
Surrey limit Somerset to 142-7 but dismissed for 118 in reply
Alex Hoad, Alex Winter, Tim Oscroft and Paul Grunill
Somerset 129-7
Tom Curran concedes just five off the over, Somerset have lost any momentum they had.
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Ian (the neutral): Surrey will walk this.
They look well on top at the moment.
Mark Davis
Former Somerset seamer on BBC Radio Somerset
Somerset's bowlers are going to have to do something very, very special if they are to turn this match around.
Somerset 123-7
Oh, what a catch! Again!
Craig Overton edges the ball to where third slip might normally be, and Tom Curran dives off to his left for a stunning one-handed effort.
Glenn Maxwell
Australia all-rounder on BBC 5 Live Sports Extra
What a start by Craig Overton. Not a lot wrong with that delivery. He's a big man with a big stride and he hit the ball on the up.
Somerset 123-6 v Surrey
Craig Overton is quickly away, drilling his first past the bowler for four, and then nudging another off his hips.
Melissa Story
BBC Radio London
Somerset are in a position they haven't experienced too often after that superb group stage - under pressure.
Somerset 115-6 v Surrey (15.1 overs)
Ged Scott
BBC Sport at Edgbaston
Surrey on top on the pitch but intriguingly poised in the skies.
This could go either way. That ugly looking cloud coming in from the direction of Small Heath, that is.
After a short spell when it seemed you could count as many brollies and empty seats in the crowd as faces, the sun is shining again.
The 'rain radar' scans for the rest of the day suggest there might be a few minor delays, yet that it otherwise seems reasonably clear.
But, looking over to the right from the Cannon Hill Park end, you can't help feeling that there is a bit more to unload.
Somerset 115-6
Another one bites the dust.
Ben Green skies it high into the offside, and Sean Abbott bellows that it is his to claim. Which he does.
Anthony Gibson
BBC Radio Somerset's cricket commentator
Brilliant catch!
Jamie Smith launched himself off the ground to get that ball.
The writing appears to be on the wall for Somerset.
Daniel Norcross
BBC Radio London
Is he a bird? Is he a plane? What a catch. Plucked it out one handed. An important wicket because Somerset had built up some momentum.
Somerset 108-5 v Surrey
Oh, what a catch! What. A. Catch!
Lewis Gregory's thick top edge flies high to Jamie Smith's right, and the keeper is equal to the test, pulling off a marvellous one-handed catch!
Somerset 108-4 v Surrey
Dickson seems to be breaking loose, cutting Tom Curran high and away over the point boundary for six.
Just five overs to go.
Mark Davis
Former Somerset seamer on BBC Radio Somerset
Somerset have to really start thinking about pushing down on the accelerator. Because at the moment they are not in this game at all.
Somerset 100-4 v Surrey
Lewis Gregory needs to get going, and he comes down the pitch to slap a short one from Tom Curran past midwicket for four - the first for a while.
Somerset 92-4
The sun got one of the biggest cheers of the day when it appeared just now.
Abbott mixes his pace up well for a tight over, and it has stopped raining! For now...
Anthony Gibson
BBC Radio Somerset's cricket commentator
This Surrey bowling has been real quality.
Somerset 90-4 v Surrey
Now the sun is out - still with me?
Somerset 88-4
It really is tipping it down, but credit to all involved as they soldier on through the wind and the rain.
Mark Davis
Former Somerset seamer on BBC Radio Somerset
That is the end of Tom Abell. He just missed the ball, it was a wild hack, no bat face to hit the ball with. Horrible.