B737-700
Flight Crew Last 90 Days 200; Flight Crew Total 20000
Situational Awareness; Time Pressure; Workload
Inflight Event / Encounter Weather / Turbulence
Flight Crew Took Evasive Action
Weather
During takeoff roll above 100 knots both Captain and First Officer (FO) airspeed indicator decreased 30 to 40 knots very rapidly and then accelerated 30 to 40 knots very rapidly. Then airspeed stopped about 10 knots below Vr then became erratic. I called wind shear and applied full power and commanded FO to continue. I called Vr at the max Vr per SABRE T.O. data. More windshear on initial climb towards mountains. Unable to continue on tower vector and turned away from shear. Advised ATC of maneuver and shear with no complications. Configuration was left on climb as T.O. until clear of shears. No overspeed of flaps.
During takeoff above 100 knots a B737-700 encountered a windshear with 30-40kt airspeed fluctuation. Maximum thrust was maintained and aircraft turned away from mountains and out of maintain wave area.