A Category 5 upon landfall on the Yucatán Peninsula , Janet caused Causation severe devastation in areas of Quintana Roo and British Honduras .

Only five buildings in Chetumal , Mexico remained intact after the storm , and an estimated 500 deaths occurred in the Mexican state of Quintana Roo .

It strengthened Cause_change_of_strength to a peak intensity of 135 mph ( 215 km/h ) prior to landfall Arriving on Quintana Roo , Yucatán Peninsula .