Date: 202103
Local time of day: 1201-1800
Location: ZZZ.ARTCC, US
Flight conditions: IMC
Weather elements / visibility: Icing; Turbulence; Windshear
Light: Daylight
Aircraft: EMB ERJ 170/175 ER/LR
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Takeoff / Launch
Airspace: Class E ZZZ
ATC / advisory: Center ZZZ
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Human factors: Distraction; Communication Breakdown; Confusion
Anomaly: Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Weather / Turbulence; Inflight Event / Encounter Weather / Turbulence; Inflight Event / Encounter Loss Of Aircraft Control
Result: Flight Crew Regained Aircraft Control
Contributing factors: Human Factors; Weather
Primary problem: Weather

Narrative: I completed a thorough walk around and told the Captain there was a lot of ice on the aircraft and we were going to need to deice. I also recommended we take off with full Anti-ice on and the Captain agreed after a minute. We did a full deice type 1 and 4 everything went as planned. I ran the cold weather cold soaked check list to prepare for deicing. Once Deicing was completed I received all the pertinent information from iceman and wrote it down on a TOLD card. I then completed the deicing check list and we called ground for taxi. I made sure all the deice check list was completed and we taxied out for departure. Myself and the Captain talked about leaving the flaps and slats up or down while taxiing and due to having such a long hold over time we chose to lower flaps to proper flap setting for takeoff knowing that our hold over time would be reduced by 50%. As we pulled onto the runway and did our final configuration check we had a no take off and the Captain adjusted the FMS info for takeoff and the neck check was good to go. We were cleared for takeoff and I did all my flows and the before takeoff check list. Power was set and we began to roll and immediately the Captain was going left and right on the runway due to the winds being so strong and at this point I put my feet on the pedals getting ready to help the Captain. We reached V1 and I called out V1 then rotate. As soon as we rotated next thing I know is we are going left of the runway due to the winds being so strong at this point I don't remember if I called out positive rate and this allowing the Captain to call gear up. The next thing I remember is calling out acceleration and the Captain calling out flight level change and auto pilot on. At this point we are getting bumped all around due to the severe weather.  The Captain then says flaps and I raise them watching the airspeed as we are bumped around.  I call out speed since we are getting close to the speed warning and the Captain does not have time to get the nose up higher to stop this warning from happening then we notice all of a sudden we have a packs off message and the Captain says the packs are off and I state they are on.  He resets them but to no avail.  They continue to show off.  At this time the Captain says the gear is down and raises it while we are being thrown all around. I ask ATC if we can level off at 11;000 and they clear us to level off at 11;000.  We are still getting pounded and unable to maintain 11;000.  I reach for the QRH as the Captain calls for the QRH between 11;000 and 13;000 the packs off warning message goes away and due to already being at 13;000; ATC asks if we would like to continue to climb and I state yes after looking over at the Captain and he nodded his head to say yes. I then ask about the weather and they state the weather will calm down above 20;000. We are then cleared to climb to 23;000 and I say to the Captain when we are above 20;000 I'm sorry I don't recall if I called out positive rate allowing the Captain to call for gear up and the Captain responds that he did call for gear up and he always does. But I don't recall any call out for gear up. I would really like to hear the recording just to see what all was said while we were being battered around. Everything ended up normal from this point on.  Once we landed our flight attendant stated the passengers were not happy with the take off and were screaming.Unfortunately; there is not much we could have done on this take off that we did not already do. We had already talked to ground to see if other aircraft had taken off and they said everything was fine with the first 3 departures. We checked the winds with ACARS including gusts and ACARS showed the take off to all be within tolerances. I wish I remembered if I had called out positive rate and had heard gear up but I did not and don't remember.




Synopsis: Air Carrier flight crew reported severe turbulence on takeoff resulting in a speed deviation.