ST27, thanks, I was trying to look up that Southern DC9 crash and couldn't remember the year or airline. I was just east of Cancun one day in a B727 in the clouds deviating for wx, FO flying, I was flying to Honduras and left the frequency to make a PA. Two minutes later I to came back to flying duties and was surprised to see nothing on the radar and the FO was going back on course. About a minute later we had moderate to higher turbulence when he flew over the cell. He had turned the tilt control to level attitude so wasn't painting the cell any more. Now days you would think every pilot knows how to properly operate the onboard radar. Maybe I am wrong.