Llanelli v Connacht, Sat 19th Feb

Was going to go but I have abandoned the plan to focus on Edinburgh ...

I'd say you might be lucky if that plane makes it to Knock to pick you up. Amber warnings in Bristol all day.
Glad I decided against the boat from Rosslare!

If the flight goes ahead ye could stall in Bristol for the night. Should be grand Saturday.
I wonder is the game itself in jeopardy? Should be grand by kick-off but Connacht's travel plans are probably disrupted.
The games in Cardiff and Limerick are still scheduled for tomorrow anyway.

That's what the journey planner says, but here it says there was a joint statement from all the rail companies: www.bbc.com/news/uk-wales-60413508
So maybe GWR just haven't got their timetables updated yet.
Your big problem is will the plane get to Knock in the first place? It is scheduled to leave Bristol at 13:30, and there's a red warning there until 12:00 #tight

Cardiff v Zebre is off now anyway.

Ryanair seem undeterred by any of this storm lark, so you won't get any money back for your flight! You could always stage the entire trip remotely in Rabbitt's, starting now ...