DHC8 flight crew diverted to another airport after encountering severe turbulence and windshear during an approach at 3000 ft causing the aircraft's altitude to fluctuate plus or minus 500 ft.

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Attributes
ACN	542338
Time
Date	200203
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lga.airport
State Reference	NY
Altitude	msl single value : 3000
Environment
Flight Conditions	Mixed
Weather Elements	Windshear Thunderstorm Turbulence
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : missed approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 5500 flight time type : 3200
ASRS Report	542338
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather inflight encounter other non adherence : clearance other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : regained aircraft control flight crew : exited adverse environment flight crew : diverted to another airport
Supplementary
Problem Areas	Weather
Primary Problem	Weather

Narrative:

With moderate turbulence we experienced excessive up and downdrafts on approach into lga, with airspeed fluctuations of +/-20 KTS. The approach was missed and when level at 3000 ft on a vector away from lga we experienced windshear which caused altdevs of +/-500 ft. Many aircraft in the area were reporting same problems, and conditions seemed to just 'pop up' without any warning. A diversion was made and a safe landing executed.

Original NASA ASRS Text

Title: DHC8 FLC DIVERTED TO ANOTHER ARPT AFTER ENCOUNTERING SEVERE TURB AND WINDSHEAR DURING AN APCH AT 3000 FT CAUSING THE ACFT'S ALT TO FLUCTUATE PLUS OR MINUS 500 FT.

Narrative: WITH MODERATE TURB WE EXPERIENCED EXCESSIVE UP AND DOWNDRAFTS ON APCH INTO LGA, WITH AIRSPD FLUCTUATIONS OF +/-20 KTS. THE APCH WAS MISSED AND WHEN LEVEL AT 3000 FT ON A VECTOR AWAY FROM LGA WE EXPERIENCED WINDSHEAR WHICH CAUSED ALTDEVS OF +/-500 FT. MANY ACFT IN THE AREA WERE RPTING SAME PROBS, AND CONDITIONS SEEMED TO JUST 'POP UP' WITHOUT ANY WARNING. A DIVERSION WAS MADE AND A SAFE LNDG EXECUTED.

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.