Broken tree

Between moving irrigation pipes twice a day, and the high temperatures, my sleep schedule is messed up.  Today I went to sleep at 4:30 pm to catch up on my sleep.  I slept for almost two hours.  Apparently I slept hard.  At one point I kind of woke very briefly as I thought I heard some thunder.  When I got up later I seen the ground was wet.   Oh, it must have rained.

When I went out to move irrigation pipes I saw in the south pasture a top third of a large tree had broken off.   What went on when I was sleeping?

According to the weather service...

So that is why part of the tree was broken off.

As you can see the trunk is large.

I'm still irrigating this field.  So I now have work to do with my chainsaw.  Just what I need.