AN ACR ACFT ON APCH TO MGGT EXECUTED A GAR JUST AS A PREDICTIVE WINDSHEAR WARNING AND A WINDSHEAR HIT. ATC MISLED THE CREW ABOUT THE LOCAL WX.

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ATC LACK OF WX INFO. APCHING GUA NEAR RABINAL WE HAD BRIEFED OUR APCH TO RWY 19 (RNAV) AS PER ATIS. UPON REACHING RABINAL VOR; ATC CLRED US FOR THE ILS DME 2 RWY 1. WE QUICKLY BRIEFED THE APCH WHICH I HAD BRIEFED WHILE AT CRUISE ALT EXPECTING THAT TO BE THE RWY IN USE. THERE WAS A LEVEL 3 CELL MOVING FROM E TO W AT 10 KTS WHICH CONCERNED ME. I ASKED APCH AS TO THE WX CONDITIONS ON RWY 1; BUT TO MAKE SURE I TALKED TO TWR ON #2 RADIO TO DOUBLE CONFIRM APCH'S RPT. APCH SAID THAT ANOTHER ACR HAD EXECUTED THE APCH AND HAD THE ARPT IN SIGHT WITHIN AROUND 5 MI OUT AND TWR SAID THE CEILING TO BE AT 6000 FT (I WAS NOT SURE IF THAT WAS FROM A PREVIOUS WX SUMMARY OR HUMAN OBSERVATION; SINCE WHAT I WAS SEEING DIDN'T LOOK LIKE 6000 FT AGL). I ASKED HIM TO KEEP ME INFORMED FOR ANY CHANGES. I WAS CONCERNED THAT SHOULD THE WX DETERIORATE AFTER WE PASSED AUR VOR ON OUR INITIAL DSCNT TO THE FIRST STEP DOWN ALT IN THE APCH ON THE D215G WHICH IS 6600 FT MSL; WE HAD NO CHOICE; BUT TO CONTINUE OUR APCH AND THEN EXECUTE A MISSED APCH INTO THE WX; MUCH LIKE A 1 WAY STREET WHICH IS THE APCH AT GUA RWY 1. I ASKED REPEATEDLY FOR WIND DIRECTION AND SPD TO STAY AWARE OF ANY SUDDEN CHANGES AS THE SYS WAS OVERHEAD; BUT APCHS WERE BEING CONDUCTED IN A NORMAL MANNER. MY FUEL LOAD AT THE TIME WAS 10400 LBS WHICH WAS ENOUGH FUEL TO GO TO BZE (BELIZE) OR SALVADOR TO THE S OF GUA. SALVADOR HAD WX AS WELL AS BZE. I TOOK A PEEK WHILE AT CRUISE AND BELIZE HAD CUMULONIMBUS OVERHEAD AND THE SYS WAS DEVELOPING AS WE DRUMMED S TO GUA. WE DSNDED ON PROFILE AND INTERCEPTED THE ILS AND GS WITH LNDG CONFIGN COMPLETED WHEN GUA TWR SAID THAT THE RWY WAS NOW OBSCURED; WINDS AT 090 DEGS/09 KTS. I COULD SEE THE LOWER PORTION OF THE POOR HOUSING AREA LOCATED RIGHT BEFORE THE ARPT; BUT I COULD NOT SEE THE RWY. I PREPARED FOR THE GAR AND AT AROUND 5800 FT MSL I SAW AN AMBER GLITCH ON THE NAV DISPLAY; BUT NO FURTHER WARNINGS WERE ANNUNCIATED. WE WERE ABOUT 2.5 MI FROM THE APCH END; AND AS SOON AS I STARTED THE MISSED APCH WITHOUT ANY PREDICTIVE WARNINGS WE RECEIVED THE WINDSHEAR REACTIVE MODE; WE HAD DRIVEN INTO A FULL BLOWN WINDSHEAR SCENARIO AND WE HAD RETRACTED THE LNDG GEAR AT THE SAME TIME SINCE WE WERE EXECUTING A NORMAL MISSED APCH; BUT IT ALL HAPPENED AT THE SAME TIME. THE ACFT DWINDLED IN AND OUT OF THE ALPHA AREA MUCH LIKE IN THE SIMULATOR; ENGS WERE AT TOGA SCREAMING; BUT THE ALT WAS HOLDING AT 6000 FT +/-200 FT. IN ALL HONESTY MY CONCERN WAS FOCUSED ON MONITORING THE AUTOPLT FOR IT TO STAY ENGAGED AND FOR US TO STAY IN THE MISSED APCH AS I PUSHED THE NAV TO STAY WITHIN THE SAFE ALT AND MISSED APCH CORRIDOR; STRAIGHT AHEAD IS THE IDEAL SCENARIO; BUT GUA TERRAIN DOES NOT ALLOW FOR THAT LUXURY. I HOPED FOR IT TO END SOON SINCE INITIATING THE TURN FOR THE MISSED COULD HAVE BEEN EXTREMELY DANGEROUS; BUT THE OTHER OPTION WAS A CATCH 22; HIT BUILDINGS AND HIGH TERRAIN AND I WANTED TO MAXIMIZE EVERY BIT OF LIFT TO INITIATE THE TURN IN HOPES THAT THE WINDSHEAR WOULD END SOON; EVEN IF IT PRECLUDED FROM GAINING ALT STRAIGHT AHEAD SINCE I COULD NOT SEE THE RWY AT ALL (LASTED FOR ABOUT 7 OR 10 ETERNAL SECONDS). WE CAME OUT OF IT AND AT THE SAME TIME WE CAME OUT OF THE CELL. CLBED TO OUR MISSED APCH ALT WHEN TWR OFFERED TO COME BACK AROUND TO RWY 19. I REQUESTED TO HOLD AT RABINAL VOR AND HE GAVE US 12000 FT HOLD; THERE WAS MODERATE TO SEVERE WX EVERYWHERE (ANOTHER SUMMER DAY AT GUA AND CENTRAL AMERICA). I DEBATED TO GO TO BZE; BUT I HAD CLOSE TO ANOTHER 2400 LBS OF FUEL TO PLAY WITH; SO WE STAYED IN THE HOLD AND AS SOON AS THE CELL MOVED TO THE SW WE STARTED THE VOR/DME APCH TO RWY 19. UPON LNDG AND PARKING AT GATE; THE STATION AGENT SUPVR INFORMED ME THAT THE TWR HAD GIVEN A WINDSHEAR RPT TO ANOTHER ACFT BEFORE ME; BUT HE DID NOT PROVIDE THE RPT TO US WHEN WE ASKED FOR THE WX AND WIND CONDITIONS. I ASKED THE AGENT IF HE WAS CONFUSING MY WINDSHEAR RPT INSTEAD AND HE CONFIRMED THAT HE KNEW WHEN I RPTED IT AFTER OUR MISSED APCH AND HE SAID THAT THE OTHER RPT WAS BEFORE WE INITIATED THEAPCH. IT WAS STRANGE BECAUSE; I NOTICED THAT THE TWR CTLR'S VOICE SOUNDED A LITTLE NERVOUS AFTERWARD ON OUR APCH TO RWY 19. AS MUCH AS I ALWAYS TRY TO STAY AHEAD WHEN I FLY TO CENTRAL AMERICA; I FOUND HOW EASY IT IS AMID ALL OF THE PLANNING AND JUDGEMENT CALLS; HOW THINGS CAN TURN SOUR IN A HEARTBEAT; VERY DISCONCERTING TO SAY THE LEAST. I BELIEVE WHAT SAVED US WAS TO INITIATE THE MISSED BEFORE REACHING OUR PUBLISHED DECISION ALT; IT GAVE US THAT EXTRA ALT TO TRADE FOR OUR WINDSHEAR RECOVERY WHICH WOULD HAVE HAD US IMPACT THE GND HAD WE BEEN LOWER OR AT OUR DECISION ALT; WE'LL NEVER KNOW AND I AM HAPPY WITH IT.