Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 44; Flight Crew Total 2038; Flight Crew Type 2038
Situational Awareness; Time Pressure
Inflight Event / Encounter CFTT / CFIT; Inflight Event / Encounter Weather / Turbulence
Flight Crew Took Evasive Action
Weather
We departed Tampa Runway 19R on ENDED9 STAR following 2 previous departures with no adverse reports. When cleared for takeoff; we observed heavy rain from a building storm about 3 to 4 miles South of field over I-275 bridge. On taxi out during the brief time when radar was pointed at weather; return displayed as a narrow band of red about 2 to 3 miles across from North to South spreading East to West well inland to East and ending over the bay to the West. We had been facing North with no view of storm for the past 10 or so minutes. Takeoff roll and climb was normal and we had penetrated the band of heavy rain by about 1000 ft MSL. Nearing S speed passing about 1;500 ft MSL; airspeed began to hesitate then decay and rate of climb turned to a descent of about 1;500 fpm down. GPWS sounded with 'DON'T SINK DON'T SINK' and First Officer (FO) reacted with TOGA and increase in pitch. The descent was arrested and climb continued. Lowest radar altitude was about 1;200 ft AGL. Total time was about 10-15 seconds and we never encountered any lateral course deviations nor any typical entry or exit parameters of windshear- just the vertical aspects. We reported the microburst encounter to Tampa Departure and advised that our flight path should be avoided by any subsequent departures.
A320 Captain reported windshear encounter on take off; resulted in windshear escape maneuver.