MLG CREW CONTACTED WINGTIP ON RWY DURING LNDG.

Narrative

APCH TO ILS RWY 27 BOS NORMAL AND STABLE. CURRENT ATIS ALMOST 1 HR OLD; RPTED OVCST SKIES; GUSTY WINDS. WHEN WE PASSED THE FINAL FIX; WE FOUND SCATTERED CLOUDS AND WERE GIVEN A STEADY-STATE L XWIND RPT BY TWR (APPROX 240 DEGS/20 KTS). NO GUST; SHEAR; OR TURB RPTS. THE NEW STUDENT FO WAS PF. I (THE INSTRUCTOR/CAPT) WAS THE PNF. AT 500 FT AGL; I GAVE THE COMPANY REQUIRED CALL FOR SPD AND SINK; BUG +7 KTS; SINK 700 FT. THEN I REMINDED THE FO OF OUR TARGET EPR FOR OUR WT (MAX LNDG) AND SUGGESTED HE NOT REDUCE PWR TOO MUCH IF THE AIRSPD GOT JUST A LITTLE FAST. ABOUT 100 FT AGL; I REMIND HIM 'DON'T PULL THE PWR OFF UNTIL WE'RE ON THE GND' AND MADE THE 100 FT CALL. JUST BEFORE HE BEGAN TO FLARE; I SAW THE AIRSPD DROP AND I PUSHED THE PWR IN SLIGHTLY. THEN AS HE BEGAN TO FLARE; WE SUNK RAPIDLY AND I PUSHED THE THROTTLES WAY UP AND INCREASED THE PITCH ATTITUDE. WE TOUCHED DOWN FIRMLY AND BOUNCED AS I CALLED 'I'VE GOT IT.' THE R WING DROPPED AND APPARENTLY TOUCHED THE GND BEFORE MY CTL INPUTS COULD REGAIN WINGS LEVEL. THE SUBSEQUENT ROLLOUT AND TURN-OFF WERE NORMAL. I DON'T KNOW IF IT WAS WINDSHEAR; A GUST; WAKE TURB; WATER-LAND THERMAL; OR WHAT. I DO BELIEVE THE TWR COULD HAVE PROVIDED US WITH BETTER/MORE CURRENT WX AT THE FINAL FIX.