 Initially exhibiting characteristics of a <unk> low , a mid @-@ level ridge to the south of Graham caused strong <unk> winds that moved the storm slowly east @-@ southeastward . However , a deep trough eroded the ridge , allowing the cyclone to move more towards the south . According to the JTWC , the storm had intensified late on 28 February , though at the same time the BoM noted the slight weakening of the storm . Graham reached its peak intensity that day while nearing the coast . 
