Q.dying weeping willow
What is causing my weeping willow tree to have branches that look like they are peeling and dying? The bark is peeling on the trunk and very thin branches this year. The tree is 9 years old. First noticed the trunk peeling then branches, also look brown and dead.

There could be a few reasons.
A tree that grows quickly can suffer damage to the bark.
Winter sun scald can happen and damage the bark.
Can be drought related, not enough water.
Inspect the tree carefully for any other signs of insect or disease.
It may be worth a call to your local county extension office to inquire if any other reports of Willow Tree issues in your area.
You may want to call a professional Arborist to insure the health of your tree if your unable to correct the issues.
https://www.gardeningknowhow.com/ornamental/trees/tgen/peeling-bark-on-trees.htm