A321 flight crew reported severe wind shear during approach resulted in a diversion.

Attributes
ACN	1620793
Time
Date	201902
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	A321
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Weather / Turbulence

Narrative:

Just after joining the localizer to runway xxr; we encountered wind shear with a gain of 30-40 knots followed by significant loss of airspeed taking the aircraft to alpha floor. We were at 4000 feet when the event occurred; [it] resulted in a loss of 1500-2000 feet of altitude. Captain preformed wind shear escape and we flew out of it.

Original NASA ASRS Text

Title: A321 flight crew reported severe wind shear during approach resulted in a diversion.

Narrative: Just after joining the localizer to Runway XXR; we encountered wind shear with a gain of 30-40 knots followed by significant loss of airspeed taking the aircraft to Alpha floor. We were at 4000 feet when the event occurred; [it] resulted in a loss of 1500-2000 feet of altitude. Captain preformed wind shear escape and we flew out of it.

Data retrieved from NASA's ASRS site 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.