I thought the norm was 90% of the 860 mb fl level winds. NHC has used 80% from time to time when they thought that the 90% figure was not accurate for some reason in that particular storm. So, I guess the 80 or 90% is correct. Either way 135knots (knot = 1.15 MPH), is gonna leave a mark! OUCH.
860 should be 850. oops.