A LEAR 25 FLC LANDS SHORT OF RWY 9 DURING RPTED WINDSHEAR CONDITIONS AND IS LATER TOLD THAT THE PAX ONBOARD FELT IT WAS A HARD LNDG AT MMH; CA.

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ON SEP/THU/00; AT APPROX XY15 PM; I LANDED IN THE STOPWAY AREA; JUST SHORT OF THE RWY THRESHOLD. THE LNDG WAS FIRM; BUT I DID NOT CONSIDER IT A HARD LNDG. 1 OF THE 3 NURSES I WAS CARRYING; SAID THAT IT WAS THE HARDEST LNDG THAT THEY HAD EVER EXPERIENCED. THIS STATEMENT WAS RELAYED THROUGH A MUTUAL FRIEND OF ONE OF THE OTHER LINE PLTS 3 DAYS AFTER THE FLT. THE ONLY EXPLANATION I HAVE THAT MAY HAVE CAUSED THIS FIRM AND EARLY TOUCHDOWN WAS WINDSHEAR. ALTHOUGH MY INTENT WAS TO TOUCH DOWN AT THE THRESHOLD; THE AIRPLANE UNEXPLAINABLY CAME DOWN EARLIER THAN I EXPECTED. THE RWY IS SURROUNDED BY EXTREMELY RUGGED AND HIGH TERRAIN AND HAS ASSOCIATED TURB AND GUSTS. I BELIEVE THAT I CARRIED ENOUGH SPD TO COMPENSATE FOR THESE CONDITIONS WHEN ON THE FINAL APCH. THE AIRPLANE; I MIGHT ADD; NEVER SHOWED ANY INDICATIONS THAT IT WAS SLOW OR UNSTABLE THROUGHOUT THE FINAL AND TOUCHDOWN PHASES OF THE FLT. THE WINDS AT THE TIME AS RPTED BY THE AWOS-3 AT XA00Z WERE 090 DEGS/14 KTS GUSTING 18 KTS. LATER; THE WINDS WERE 090 DEGS/15 KTS GUSTING 22 KTS. IN ADDITION; THE UNICOM PERSONNEL TOOK AN AWOS-3 OBSERVATION AT THE FOLLOWING TIMES: AT XA50Z THE WINDS WERE 100 DEGS/11 KTS GUSTING 15 KTS AND AT XA52Z THE WINDS WERE 070 DEGS/3 KTS GUSTING 14 KTS. DURING THE HR WHILE WAITING FOR THE MEDICAL CREW TO RETURN FROM THE HOSPITAL; THE FO AND I NOTICED THAT THE WINDS SHIFTED A DIRECTION OF 180 DEGS 2 TIMES. FIRST; THE WINDS WERE FROM THE E; THEN THE WINDS WERE FROM THE W. WHEN WE DEPARTED; THE WINDS WERE OUT OF THE E AGAIN. DURING THESE WIND SHIFTS; THE WINDS WERE APPROX 090 DEGS/10 KTS GUSTING 15 KTS AND 270 DEGS/10 KTS GUSTING 15 KTS RESPECTIVELY. IN RETROSPECT; UNDER SIMILAR CONDITIONS; I SHOULD HAVE CHOSEN TO USE MORE OF THE AVAILABLE USEABLE RWY.