Postpublished at 18:52 British Summer Time 26 August 2021
Right - if you've not been with us for the two quarter-finals so far this week, let's give you a reminder of how they went...
Summary
Somerset beat Lancashire Lightning by seven wickets
Tom Abell's 78 not out helps hosts to victory with 10 balls to spare
Lancashire had made 184-9 from their 20 overs
Somerset join Sussex Sharks and Hampshire Hawks at Finals Day on 18 September at Edgbaston
Kent Spitfires meet Birmingham Bears in last quarter-final on Friday
Postpublished at 18:52 British Summer Time 26 August 2021
Team newspublished at 18:50 British Summer Time 26 August 2021
Somerset v Lancashire Lightning (19:00 BST)
Dane Vilas, Liam Livingstone and Alex Davies are all back in the Lancashire side while seamer Richard Gleeson also returns after recovering from a back injury which has kept him out of action since the opening Blast group game.
Leg-spinner Matt Parkinson is currently isolating due to Covid-19 and will miss the match, while Luke Wood (side) and Keaton Jennings (calf) have both been ruled out.
Lancashire are also without Saqib Mahmood and Finn Allen who are both on international duties with England and New Zealand respectively.
Here's the Lightning side in full:
Liam Livingstone, Josh Bohannon, Alex Davies, Dane Vilas (capt & wk), Rob Jones, Steven Croft, Luke Wells, Danny Lamb, Tom Bailey, Tom Hartley, Richard Gleeson.
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End of twitter postTeam newspublished at 18:48 British Summer Time 26 August 2021
Somerset v Lancashire Lightning (19:00 BST)
Somerset are without fast bowler Craig Overton (international duty) and Lewis Goldsworthy (illness), but welcome back those players who were involved with The Hundred such as Will Smeed, Marchant de Lange and Tom Lammonby.
Here's how the hosts line-up:
Tom Banton (wk), Will Smeed, James Hildreth, Tom Abell, Tom Lammonby, Lewis Gregory (capt), Ben Green, Roelof van der Merwe, Marchant de Lange, Jack Brooks, Josh Davey.
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End of twitter postTurn on and tune in!published at 18:46 British Summer Time 26 August 2021
Ball-by-ball commentary from Taunton on the BBC
We've got full match commentary of this match available for you this evening across the BBC.
BBC Radio Five Live Sports Extra and BBC Somerset and BBC Radio Lancashire are joining forces to bring you every ball.
Kevin Howells will be joined by Anthony Gibson and Scott Read as well as analysis from former Somerset bowler Mark Davis.
It's available on DAB Digital Radio, the BBC Sounds app and the BBC Sport website and app by tapping or clicking the play icon above from 18:45 BST.
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End of twitter postSomerset win toss and elect to bowlpublished at 18:44 British Summer Time 26 August 2021
Somerset v Lancashire (19:00 BST)
Image source, Rex FeaturesNews from the middle is that Somerset skipper Lewis Gregory has won the toss and elected to bowl first at the County Ground.
One side has won chasing this week and another has floundered batting second.
How will that decision look come 22:00 BST?
Welcome to the West Countrypublished at 18:40 British Summer Time 26 August 2021
Somerset v Lancashire Lightning (18:30 BST)
Image source, Rex FeaturesGood evening!
The seemingly never-ending cavalcade of cricket this summer continues down at Taunton tonight.
We're in place for the third of four T20 Blast quarter-finals with a place at Edgbaston's Finals Day on Saturday, 18 September up for grabs for both Somerset and Lancashire Lightning.
Both sides possess some quality players and potential match-winners so fingers crossed, we're in store for another pulsating encounter to go with the two we've seen already this week.
Play begins at 19:00 BST and we'll have news of the teams and from the toss shortly.