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
Mark Davis
Former Somerset seamer on BBC Radio Somerset
Image source, Rex FeaturesSomerset can't break the chain at the moment.
Just cannot get that big over to get themselves going.
They need some momentum.
Somerset 42-1 v Surrey
Tom Kohler-Cadmore edges his first ball through where slip would have been, and then Abbott is convinced yet again that he has another wicket when the batter swings at his last delivery.
Keeper Jamie Smith also appeals for the catch, but Surrey decide not to review
Carlos Brathwaite
West Indies all-rounder on BBC 5 Live Sports Extra
It's that man Sean Abbott. He always comes up trumps when the team need him. That's an important quality to have.
Surrey 38-1
Image source, Getty ImagesYes he has! Sean Abbott strikes with a thin edge to Jamie Smith, with just the slightest of spikes on UltraEdge.
Has Will Smeed edged this to the keeper? Umpire says no, but Surrey go upstairs...
Somerset 37-0 v Surrey
Tom Curran is convinced he has Will Smeed trapped in front, but Chris Jordan can't be talked around and they decide not to review.
Mark Church
BBC Radio London
Tom Curran hasn't bowled in the competition all season. So how rusty will he be?
But if anyone can do it, it'll be him because he loves the big occasion.
Somerset 33-0 v Surrey
Brother Tom joins Sam into the attack, and off his second ball Will Smeed helps it around his legs for four to the fine leg rope.
Somerset 29-0 v Somerset
There's a bit of nudging and nurdling by Somerset as Sam Curran keeps it tight until the final delivery when Tom Banton hooks him around the corner for another four.
Somerset 18-0 (2 overs) Surrey
Ged Scott
BBC Sport at Edgbaston
Image source, Getty ImagesThe smoke is just starting to clear, as well as the always enchanting smell of phosphorus, after a quite ludicrous, industrial-scale amount of pre-match fireworks preceded the arrival of Surrey and the two Somerset batters.
Meanwhile, the second semi is now underway half an hour late - and all the inactivity during the rain breaks has clearly helped warm things up in the now almost full Hollies Stand.
First on the playlist from the Hollies is the "Don't Take Me Home" Wales football chant, which accompanied them on their way to the Euro 2016 semi-finals, and now seems to have been taken up by England's cricket fans in the Ashes.
More to the point, Somerset are here. And the afternoon could be about to get rather lively.
Somerset 18-0
The highly-rated Gus Atkinson is next up, but Will Smeed flips him high over midwicket for four off the second delivery.
Atkinson then drops it short, and Smeed top-edges him over the keeper with a hook for a six - not under control but he'll take it.
Somerset 8-0 v Surrey
Sam Curran drops short and Tom Banton pulls it, high on the bat, but it drops over the head of a fielder to leg.
And then off the final ball, Banton edges it for four just past the left hand of Jamie Overton at slip! Close, but no cigar.
Somerset 2-0 v Surrey
Smeed is also off to his first ball, slicing the ball to point.
Somerset 1-0 v Surrey
Banton pushes the first ball to mid-off and we are properly under way.
We are all set, Tom Banton and Will Smeed are at the crease for the first of 19 overs.
Sam Curran will deliver the first over.
Somerset v Surrey
Optimistic souls, the players of Somerset and Surrey. Or so it appeared when they arrived at Edgbaston.
The shades would have been perfect for a break somewhere in sweltering mainland Europe, but those see-through plastic rain hats you can buy at the seaside would have been more appropriate for a soggy day in the West Midlands.....
Image source, Getty Images
Image source, Getty Images
Image source, Getty ImagesSomerset v Surrey
They will be starting at 15:30 BST, in a game reduced slightly to 19 overs a side.
There was a nice moment at the end of the first semi-final when Simon Harmer offered a consolatory pat on the noggin to Nathan Ellis after hitting him into the middle of next week to seal Essex's win over Hampshire. Shades of Andrew Flintoff and Brett Lee in 2005 on the same ground.
Either that, or Simon was practising for a post-cricket career in a spiritual profession....
Image source, Getty ImagesSomerset v Surrey
One intriguing little battle in this match when it happens is Surrey's Jamie Overton v Somerset's Craig Overton.
Jamie has yet to bowl in this year's T20 Blast, but both he and Craig can be lively when they're in the groove.
Their parents are not at Edgbaston, and with the way it's panned out with the weather and the distances involved, and not wanting to favour either of the twins, that's probably a good call.
Agh! The heavens have opened again and the covers are on.