CPR PLT IN SMT TWIN CONTINUES LNDG AT LLU; MO; EVEN AFTER SEEING INDICATIONS OF A WIND SHIFT DURING THE LNDG PHASE. LANDS LONG; MAKES A HARD LNDG; PERFORMS A GAR. NOSEWHEEL COLLAPSES UPON SUBSEQUENT LNDG.

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A ROUTINE IFR FLT FROM WICHITA; KS; (3 KM) ENDED AT LAMAR; MO; (LLM) WITH A COLLAPSED NOSEWHEEL. NO DAMAGE TO THE ARPT FACILITIES OR PERSONAL INJURIES WERE SUSTAINED. INITIAL POST-INCIDENT VISUAL INSPECTION REVEALED COLLATERAL DAMAGE TO THE PROPS AND NOSEWHEEL GEAR DOORS. THIS FLT DEPARTED AB15 LCL ON AN IFR FLT PLAN TO LLU ARRIVING AT APPROX AC15. APPROX 20 MI W; ZKC ADVISED THE NEAREST RPTING WX STATION; JLN; AS WIND CONDITIONS OF 210 DEGS AT 10 KTS. APPROX 3 MI FROM THE END OF RWY 21 AT LLU; SMOKE WAS OBSERVED FROM BURNING BRUSH BLOWING FROM SSW TO NNE INDICATING LCL CONDITIONS FAVORED RWY 21. A ROUTINE MID-FIELD ENTRY FOR L DOWNWIND WAS EXECUTED WITHOUT ANY UNNECESSARY PATTERN CORRECTION TO INDICATE WIND CONDITIONS WERE ANYTHING OTHER THAN THOSE FAVORING RWY 21. ON SHORT FINAL; THE WINDSOCK WAS OBSERVED TO BE A DIRECT XWIND. DURING THE FLARE TO LAND/TOUCHDOWN; I OBSERVED THE WINDSOCK HAD SHIFTED TO INDICATE A DIRECT TAILWIND. IMMEDIATELY UPON TOUCHDOWN; BRAKING WAS INITIATED BUT DETERMINED INADEQUATE RWY REMAINED FOR STOPPING. GAR WAS INITIATED; BUT THE ACFT MADE TERRAIN/WHEEL CONTACT BEFORE A SUSTAINED POSITIVE RATE OF CLB COULD BE ACHIEVED. AFTER REACHING A SAFE ALT; A CONTROLLABILITY CHK WAS PERFORMED IN THE LNDG CONFIGN. GEAR INDICATORS INDICATED 3 DOWN GEAR LIGHTS. THE ACFT EXHIBITED NORMAL CHARACTERISTICS IN THE ROLL; PITCH AND YAW AXES AND VIBRATION LEVELS AT ALL PWR LEVELS WERE CONSIDERED NORMAL. INITIAL ASSESSMENTS FOR DAMAGE SUSTAINED WAS MINOR; IF ANY. A NORMAL APCH TO RWY 3 WAS ACCOMPLISHED. DURING THE FLARE; AS THROTTLES WERE BROUGHT TO IDLE; NOSE ATTITUDE BEGAN TO SETTLE LOWER THAN EXPECTED. BACK YOKE WAS APPLIED AND FUEL CUTOFF WAS ACCOMPLISHED. AS AIRSPD DECREASED THE NOSE SETTLED; SKIDDING THE ACFT L AND DEPARTING RWY 3 ON THE W SIDE AT APPROX AC20 LCL. THE REASON FOR THE DRAMATIC WIND SHIFT WAS FRONTAL PASSAGE OCCURRING AT LLU AT THE TIME OF OUR ARR. I WAS AWARE THE FRONT WAS MOVING NW TO SE BUT NEVER HAD EXPERIENCED ANYTHING SO UNUSUAL ON A CLR DAY.