Narrative:

Air carrier flight ahead reported windshear alert at 400 ft and started missed approach. ATC asked our intentions and we advised we would continue approach and monitor situation. We broke out of the bases at 1000 ft MSL to clear VMC and good visibility below. Runway 22 in sight at 1000 ft MSL. At approximately 900 ft, first officer saw rapid 15-20 KT airspeed loss and advised captain who immediately began missed approach and power advance. Approximately 3-4 seconds later, windshear advisory from radar went off (sounded). Simultaneously we entered a strong updraft which pegged the VS1 at 6000 FPM. Captain initiated level off to stop at 2700 ft but, due to updraft strength, we finally leveled at 4350 ft with very pronounced nose down pitch and approximately 1.67 EPR. Airspeed stable at 200 KTS. As we ascended on go around, I advised ATC of our inability to stop climb and controller progressively cleared us to 3000-4000 ft, '5000 or 6000 ft whatever we needed.' great coordination on controller's part to get us out of the area and to a safe holding position. There was little turbulence associated with the windshear after initial airspeed loss. Vertical rate associated with updraft was very impressive! We did experience 1 shear reversal at approximately 3600 ft then back up. On final approach, heading to maintain track was approximately 225 degrees, tower issued windshear alert with winds 300 degrees 15 KTS to 320 degrees 19 KTS with radio swing of all winds to approximately 330 degrees 20 KTS. These winds were not reflected until approximately 900 ft MSL when airspeed loss observed.

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Original NASA ASRS Text

Title: AN MD80 CREW RPTS HAVING TO TAKE EVASIVE ACTION GAR DUE TO WX FACTORS WINDSHEAR AT LGA.

Narrative: ACR FLT AHEAD RPTED WINDSHEAR ALERT AT 400 FT AND STARTED MISSED APCH. ATC ASKED OUR INTENTIONS AND WE ADVISED WE WOULD CONTINUE APCH AND MONITOR SIT. WE BROKE OUT OF THE BASES AT 1000 FT MSL TO CLR VMC AND GOOD VISIBILITY BELOW. RWY 22 IN SIGHT AT 1000 FT MSL. AT APPROX 900 FT, FO SAW RAPID 15-20 KT AIRSPD LOSS AND ADVISED CAPT WHO IMMEDIATELY BEGAN MISSED APCH AND PWR ADVANCE. APPROX 3-4 SECONDS LATER, WINDSHEAR ADVISORY FROM RADAR WENT OFF (SOUNDED). SIMULTANEOUSLY WE ENTERED A STRONG UPDRAFT WHICH PEGGED THE VS1 AT 6000 FPM. CAPT INITIATED LEVEL OFF TO STOP AT 2700 FT BUT, DUE TO UPDRAFT STRENGTH, WE FINALLY LEVELED AT 4350 FT WITH VERY PRONOUNCED NOSE DOWN PITCH AND APPROX 1.67 EPR. AIRSPD STABLE AT 200 KTS. AS WE ASCENDED ON GAR, I ADVISED ATC OF OUR INABILITY TO STOP CLB AND CTLR PROGRESSIVELY CLRED US TO 3000-4000 FT, '5000 OR 6000 FT WHATEVER WE NEEDED.' GREAT COORD ON CTLR'S PART TO GET US OUT OF THE AREA AND TO A SAFE HOLDING POS. THERE WAS LITTLE TURB ASSOCIATED WITH THE WINDSHEAR AFTER INITIAL AIRSPD LOSS. VERT RATE ASSOCIATED WITH UPDRAFT WAS VERY IMPRESSIVE! WE DID EXPERIENCE 1 SHEAR REVERSAL AT APPROX 3600 FT THEN BACK UP. ON FINAL APCH, HEADING TO MAINTAIN TRACK WAS APPROX 225 DEGS, TWR ISSUED WINDSHEAR ALERT WITH WINDS 300 DEGS 15 KTS TO 320 DEGS 19 KTS WITH RADIO SWING OF ALL WINDS TO APPROX 330 DEGS 20 KTS. THESE WINDS WERE NOT REFLECTED UNTIL APPROX 900 FT MSL WHEN AIRSPD LOSS OBSERVED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.