It won't be a 5 at landfall...not a chance. It is truly bombing out right now and will start to see it spin down a bit over the next 12-hours...about 10-15 mph and maintain borderline CAT-5 status and then into CAT-4.
This baby is comin in at 145-sustained...it is very hard for a storm to mainatin a CAT 5 level for longer than 24-hours and we are 48-hours from the effects piling into the Texas coastline.
Hopefully, it will calm down.