B737-300 PARKED AT GATE IN GUSTY WIND CONDITIONS WX VANES AWAY FROM JETWAY JUST AS PAX DEPLANE.

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I WAS NOT ON THE ACFT WHEN DAMAGE OCCURRED. THIS IS JUST MY ASSESSMENT OF WHAT HAPPENED. ACFT PARKED AT BWI GATE UNDER VERY WINDY/GUSTY CONDITIONS. WHEN MECH GAVE ME CHOCKS IN SIGNAL I RELEASED THE BRAKES. BOTH HYD PUMPS WERE OFF PER CHKLIST. THE CTL COLUMN WAS SLAMMING BACK AND FORTH BECAUSE OF WIND CONDITIONS; SO I TURNED ON THE B ELECTRIC PUMP TO PRESSURIZE FLT CTL SYS. I THEN EXITED THE ACFT. 15 MINS LATER A FLT ATTENDANT TOLD ME THAT THE ACFT WAS DAMAGED AT THE GATE. WHEN I ARRIVED AT THE ACFT THE NOSE WAS 20 FT FROM THE JETWAY AND WAS ON TOP OF A BAGGAGE CART. THERE WAS VERY LITTLE WEIGHT ON THE NOSEWHEEL (STRUT FULLY EXTENDED). I BELIEVE THAT THE ACFT WAS TAIL HVY AND WHEN A DOWN FORCE FROM THE GUSTY WIND OCCURRED IT LIFTED THE NOSE FROM THE CHOCKS AND WEATHERVANED INTO CART. SUPPLEMENTAL INFO FROM ACN 326733: THE CAPT LEFT THE ACFT AND PROCEEDED TO FLT OPS; AND I STOOD IN THE COCKPIT DOORWAY TO SAY GOODBYE TO OUR DEPLANING PAX. WHILE STANDING THERE I FELT THE ACFT MOVING AND WHEN I TURNED AND LOOKED INTO THE COCKPIT; THE NOSE OF THE ACFT WAS MOVING TO THE R; AWAY FROM THE JETWAY. I IMMEDIATELY JUMPED IN THE L SEAT AND APPLIED THE BRAKES AS QUICKLY AS POSSIBLE. THE ACFT CAME TO REST NEXT TO A BAGGAGE CART. AFTER VERIFYING THE CREW AND PAX WERE OK; MAINT HAD THE STAIR TRUCK BROUGHT TO THE REAR OF THE ACFT SO THE REMAINDER OF THE PAX COULD DEPLANE. I HAD ONE OF MY FLT ATTENDANTS GO TO FLT OPS AND SUMMON THE CAPT. THE WINDS WERE OUT OF THE S WITH GUSTS UP TO 40 MPH. THE NOSEWHEEL WAS CHOCKED AND WE THINK THAT THE GUST OF WIND; GIVEN THE POS OF THE ACFT; PUSHED THE TAIL ENOUGH THAT IT LIFTED THE NOSEWHEEL UP OVER THE CHOCKS; CAUSING THE ACFT TO WEATHERVANE.