Tree damage - disease/lightning or something else?

[OperationalSupport]

I noticed this branch from my Acer on the floor yesterday, does this mark on the branch and where it came from look like there’s disease in the tree, or could it be lightning damage (I don’t recall any strikes this week sounding that close and I assume it would have taken the tallest branch if it was lightning?)

Definitely not lightning. The entire tree would have been wrecked. A lightning strike instantly boils the sap inside the tree, and the pressure causes the tree to explode.

My guess is that there was an element of disease in that branch, and a sudden gust of wind has snapped it off.

@Yamadori thank you. Any idea what disease and what I should be looking out for on the rest of the tree? It seems in good health to my uneducated eyes.

Judging by the broken branch, it looks like the branch has some sort of damage on it a bit further up from the actual break. Inside the broken end there is blackening, so some sort of pathogen appears to have got in, probably via the damaged area on the bark.
Might be phytopthora, hopefully not, and it was just a localised issue. Healthy trees can usually fend off disease, so maybe give it some regular plant food that you use elsewhere in the garden anyway, to give it a boost.