EMB ERJ 145 ER/LR
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Deviation / Discrepancy - Procedural Clearance; Ground Event / Encounter Weather / Turbulence; Inflight Event / Encounter Weather / Turbulence
Air Traffic Control Provided Assistance; Flight Crew Rejected Takeoff; General Flight Cancelled / Delayed
Weather
I elected to perform a high speed aborted takeoff due to pop up severe weather conditions. Prior to departure; the weather was VFR and clear. Small thunderstorms were developing around the area north of the airport; but nothing was seen while taxiing to the runway. Both crew members engaged weather radar with an upward tilt; with nothing indicating the possibility of weather impacting departure. ATC issued a takeoff clearance for runway XX and advised us of a small cell of extreme precipitation north of the airport; and said it didn't appear to be a factor. We were lined up on Runway XX; facing south; and could not see any adverse weather around us. After initiating the takeoff roll; at around 100 knots; we encountered immediate extreme precipitation and wind forces. Visibility was reduced to 0 (I could not even see the nose of the aircraft). Simultaneously; ATC advised of 40-60 knot windshear over the runways and of a micro burst. Due to being unable to see out of the windshield and feeling the wind forces coupled with the windshear and micro burst warning; I elected to abort the takeoff. I estimate that the abort was initiated at 115 knots accounting for the reactionary delay of retarding the thrust levers. The flight attendant verified no one was injured. Aborted takeoff procedures were followed; and after a follow up with maintenance; dispatch; we were able to depart normally after the cell had passed.The conditions were not present at the time of takeoff; and no one (flight crew nor ATC) had a way to predict such a rapid; immediate change. We used wet takeoff numbers as a precaution since there were storms in the forecast while at the gate. I believe all parties involved functioned proficiently.
We were clear to take off runway XX in ZZZ. Weather was clear; and winds calm. A little bit of rain on the East side of the airport while our takeoff roll at 90 knots; Captain (CA) and the First Officer (FO) lost sight of the runway due to extreme precipitation; and simultaneously the  Tower Controller came on line and reported a Wind Shear alert on all runways; and a gain and loss of 25-30 knots. Winds went up to 50 knots. Captain decided to abort the takeoff. We initiated the abort at 117 knots. Our V speeds were as follows: V1: 129; Vr: 131; V2: 136. We stopped on the runway safely; made sure everyone in the back was all right; passengers and Flight Attendants. Tower asked us to exit the runway at the next available taxiway to our right; and stated that he did not have visual on us. We exited the runway on taxiway D; and did the after landing checklist. Tower then asked us to taxi to the run up pad of runway XX. Once at the pad; the CA contacted dispatch; talked to maintenance control and operations. We received our amendment; and we were cleared to takeoff again. The rest of the flight was uneventful.
Flight crew reported a high speed Rejected Take Off after extreme precipitation and wind shear caused visibility to go to zero.