Glasgow now face defending champions Leinster in the final at the RDS on May 31 and Tommy says the support of a 10,000 strong sell-out home crowd had made all the difference as the Gregor Townsend's men secured a ninth successive victory.
Tommy said: "It was unbelievably tense. When we scored our try and managed to get a nine-point lead we were looking good.
"But Munster did what they've been doing all season and came back strongly. It made the last 15 minutes agony.
"The last few minutes were unbelievable but we had our guys putting their bodies on the line.
"Some of the tackles were incredible as we had boys smashing into Munster at the end of what was easily the hardest game of our season.
"What a feeling it was to do that in front of a packed home crowd.
"They really pushed us over the line as I don't believe we could have performed like that if It hadn't been for them.
"This is an unbelievable team to be a part of and the supporters have been incredible."