LOW LEVEL WINDSHEAR -- ACR FREIGHTER TOUCHES DOWN SHORT OF RWY IN A HVY RAINSTORM.

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ON AN IFR APCH TO RWY 3R AT TOCUMEN ARPT IN PANAMA CITY; PANAMA; THE ACFT; A B747-200; LANDED SHORT OF THE RWY; BOUNCED ONTO THE RWY AND IN SO DOING; DAMAGED BOTH THE APCH LIGHTS AND THE ACFT. A HVY DRIVING TROPICAL RAIN STORM WITH A BIT OF AFT QUARTERING TAILWIND; LOW VISIBILITY; SOME TURB; AND POSSIBLE WINDSHEAR; CONTRIBUTED TO THE SIT. I SAW THE RWY APCH LIGHTS AT ABOUT 500 FT AND ABOUT 1 1/2 MI OUT. I DIDN'T SEE THE RWY UNTIL WE WERE UNDER 300 FT; BUT I NEVER LOST SIGHT OF THE APCH LIGHTS. WE BROKE OUT ABOUT 200 FT; WE LOOKED LOW AND I HEARD THE STICK SHAKER. THE CAPT THEN ADDED PWR BUT WE LANDED SHORT AND BOUNCED ONTO THE RWY. WE SLOWED WITHOUT FURTHER INCIDENT AND TAXIED IN TO THE RAMP. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: THE CAPT SAID THAT THE FAA CONCLUDED THAT WINDSHEAR WAS THE CAUSE OF THE INCIDENT. THE B747-238B FREIGHTER SUFFERED SKIN DAMAGE PRIMARILY DUE TO CONTACT WITH THE APCH LIGHT STANCHIONS AND IT IS NOW BACK IN SVC. THE CAPT SAID THAT THE WX CONDITIONS WERE NOT VERY GOOD; BUT WERE WELL ABOVE THE MINIMUMS REQUIRED FOR THE APCH ACCORDING TO THE TWR'S RPT. THERE WERE NO INJURIES.