That is probably the lowest spot so that's where it comes through.
Your problem now will be that you have stood on the gravel that dissipates the heat and there will possibly be more damage to the felt.
Get it fibreglassed in the spring and be done with it.
http://www.ecfibregl...rp-roofing.aspx
First class suggestion Jim.
One for the Zed shed ::-- Two sets linked to a PIR linked to a power/d tap linked to................................................................................