Emergency — call now
What you're describing is a structural failure risk, or active storm damage within range of something it could hit.
A cracked/split trunk, a new or worsening lean, and large fungal conks growing on the trunk or at the base are all signs the tree's internal structure may already be failing — that risk doesn't go away just because nothing is in range yet, since failure direction is often unpredictable. Storm damage (broken or hanging limbs) becomes an emergency specifically once a house, driveway, fence, power line, or a place people walk or park is within range.
Next step: Keep people and pets clear of the area and call a tree service provider today. If a power line is involved, treat it as an electrical hazard first — don't attempt to clear it yourself.
See emergency storm damage tree removal in Amarillo →