Date: 201507
Local time of day: 1801-2400
Location: ATL.Airport, GA
Flight conditions: VMC
Weather elements / visibility: Windshear; Thunderstorm; Turbulence
Light: Night
Aircraft: Medium Large Transport; Low Wing; 2 Turbojet Eng
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Ferry / Re-Positioning
Flight phase: Climb; Initial Climb
Airspace: Class B ATL
ATC / advisory: TRACON A80; Tower ATL
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Not Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Workload; Time Pressure; Physiological - Other; Communication Breakdown; Distraction
Second reporter function: Pilot Flying; First Officer
Anomaly: ATC Issue All Types; Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Weather / Turbulence
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Issued Advisory / Alert; Flight Crew Took Evasive Action
Contributing factors: Procedure; Weather; Company Policy
Primary problem: Procedure

Narrative: Immediately after takeoff. Me and my First Officer (FO) encountered windshear. I am new to the aircraft so everything seemed to happen very quickly. I'll try to give you the facts the best I can.  Immediately after wheels off the ground the windshear alert sounded. We got 3 orals and windshear guidance. The First Officer was pilot flying (PF) [and] I was pilot monitoring (PM). We were going up to 10;000 feet which had been set. During our windshear recovery ATC gave us a new heading and I read back something like the heading and also that we were in windshear recovery and encountering severe turbulence. As we were reaching 10;000 feet; I was telling the FO to watch his pitch and altitude. The FO was doing the best he could with the conditions we were in. As we were passing through 10;000 feet ATC gave us 14;000 feet. We set 14;000 feet. Somewhere in between 10;000 feet and 13;500 feet ATC tried to give us a phone number to call. I told him to standby and we were still in severe windshear and turbulence. About 13;500 feet we exited into better conditions. We were on a reposition flight; the aircraft was light and climbing rapidly. About this time I told the FO to watch his altitude. I said it a few times and tried to assist him to push the nose down. We were unable to level off in time. ATC told us we went through 14;000 feet. We got back down as quick as possible. We got the autopilot on; took down the number from ATC; and made a PIREP.  In the future faced with a similar situation with a thunderstorm approaching the field I'd heavily consider waiting until it passed the field before departing. My thought at the time was several aircraft departed ahead of us took off so I figured we would be OK. Unfortunately that wasn't the case. If I do encounter windshear/significant turbulence in the future on departure I would be much more vigilant at making my call outs of airspeed; pitch corrections; and heading corrections. I would tell ATC to standby windshear recovery and leave it at that until we were completely clear of the conflict. But in hindsight I should have decided to wait it out.


Second narrative: In hind sight I would also consider rejecting the takeoff if the wind is drastically different than reported judging by the corrections required to maintain the Runway Centerline.


Synopsis: An air carrier crew took off into a line of thunderstorms; encountered windshear immediately after liftoff and initiated the windshear recovery procedure. Severe turbulence then continued up to about 13;500 feet. The crew had difficulty leveling at 14;000; due to the aircraft's high rate of climb.