AN ACR FLC FLYING A B727 AT DEN RWY 16 EXPERIENCES WINDSHEAR ON FINAL APCH AND EXECUTES A MISSED APCH.

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ACFT WAS ON A VISUAL APCH TO RWY 16 AT DEN. AT APPROX XA55Z AND 6800 FT MSL; ACFT EXPERIENCED DECREASING PERFORMANCE IN AIRSPD; VERT SPD AND SUBSTANTIAL REQUIREMENT FOR INCREASED FUEL FLOW TO MAINTAIN GS AND AIRSPD. ALMOST IMMEDIATELY THEREAFTER; WINDSHEAR AURAL AND VISUAL ALERTS WERE DISPLAYED IN THE COCKPIT. ACFT THROTTLES WERE ADVANCED TO MECHANICAL STOPS IN A WINDSHEAR ESCAPE MANEUVER. ACFT PERFORMANCE INITIALLY CONTINUED TO DECREASE FOR APPROX 5 SECONDS. RECOVERY AND ESCAPE IMMEDIATELY FOLLOWED. GAR WAS MADE. THIS WAS AN ACTUAL WINDSHEAR ENCOUNTER AND ESCAPE; CREW ATTN WAS FOCUSED ON PITCH ATTITUDE; AIRSPD; AND VERT SPD INDICATIONS. PRIOR TO INITIATING OUR INITIAL APCH TO RWY 16; THERE WERE NO INDICATIONS OF WINDSHEAR; MICROBURST; BROAD TEMP DEWPOINT SPREADS; OR STRONG OR GUSTY SURFACE WINDS. THERE WERE NO ALERTS FORWARDED TO CREW BY ATIS; OR ZDC; IN REF TO WINDSHEAR; MICROBURST; OR STRONG SURFACE WINDS. WITHIN 5 SECONDS OF OUR ESCAPE MANEUVER; DEN TWR IMMEDIATELY BEGAN ISSUING WINDSHEAR ALERTS FOR RWY 16. WE DECIDED TO ATTEMPT A VECTOR FOR RWY 17L AFTER A SHORT DELAY; AS THERE WERE NO ADVERSE CONDITIONS RPTED ON THAT RWY. PRIOR TO REACHING THE FINAL APCH COURSE FOR RWY 17L; CONDITIONS DETERIORATED. RWY 17R BECAME THE NEXT OPTION; THAT DETERIORATED AS WELL. FINALLY RWY 16 BECAME AN OPTION AGAIN; AND THEN DETERIORATED. ON DEPARTING THE RWY 16 FINAL APCH COURSE; DECREASING PERFORMANCE WAS AGAIN EXPERIENCED. THE CONDITIONS CONTINUED TO DETERIORATE AT DEN AND THE DECISION WAS MADE TO PROCEED TO COS; THE NEAREST SUITABLE ALTERNATE BASED ON DISTANCE; MECHANICAL CONSIDERATIONS; WX; AND TIME. DISPATCH WAS NOTIFIED OF OUR DECISION.