AWR Takeoff Actions RNAV
Once you are on the runway and away from ground personnel, the airborne weather radar can be turned on. If there are thunderstorms in the vicinity and you have elected to take off anyway, then the radar should be tilted up. This will look in the area of the climb out path, giving you advance warning of any potential problems. Note: in the real world, it may well be better to delay the takeoff rather than potentially entering a thunderstorm cloud during such a critical phase of flight.