Sorry, I can't help. I know Scots Gaelic, and know only a little Irish Erse. I'll have a look myself, see if anything looks familiar, but if you can find it out, though, I could probably help you with pronunciation.
If you want to learn how to say 'are you drunk yet?' in Irish, let me know . *
EDIT: Below is what I think to be correct, but if you're not happy with it, and can't find it with certainty, here are two near-enough words (that are somewhat menacing, in my opinion) of which I am certain, if you can settle for them. 'Storm', spelled Stoirm. Pronounced 'stirm'. Or 'frost'. Sioc, pronounced shuk.
From what I gather, lightning is 'tintreach', which, I think, would be pronounced 'chin-trokh'. The chin at the beginning would be like how you would pronounce chin (as in hair on my chinny chin chin). Trokh would be pronounced like loch. The first syllable would be ever so slightly shorter than how we'd normally pronounce the word 'chin', with trokh at normal length. The t needs to sound a little fuzzy, like a trilled T, but not quite near ch.
I should point out that there is, of course, a difference in how you and I would say loch, according to our different accents. So I'd need you to imagine how I, or a Scot, would say it, instead of the aw version that is used in the American accent.
I got 'tintreach' from irishionary.com, which lists it as a validated word. That's the best I can do, without tracking down an Irish dictionary at a library.
*(Okay, I want to show off, so the phrase is 'An bhfuil tú ar meisce fós?' Pronounced 'On will too air mesh-keh fohss?')
I am a Star Wars fan. That doesn't mean that I hate or love Jar Jar. That doesn't mean I hate or love Lucas, or agree or disagree 100% with him. That doesn't mean I prefer the PT over the OT, or vice versa. That doesn't mean I hate the EU, or even love all of it. These are not prerequisites. Being a man is not a prerequisite. Being a geek is not a prerequisite. The only prerequisite is that I love something about Star Wars. I am a Star Wars fan.
Life is like the Force - Luke Skywalker, Crucible. Damn straight I am.