We analyzed high angular resolution 45.5 GHz images of the W49 North massive star forming region obtained in 1998 and 2016 with the Very Large Array .
Most of the ultracompact HII regions show no detectable changes over the time interval of the observations .
However , subcomponents B1 , B2 , G2a and G2c have increased its peak flux densities by values in the range of 3.8 to 21.4 % .
Most interestingly , the cometary region C clearly shows proper motions that at the distance of the region are equivalent to a velocity of 76 \pm 6 km s ^ { -1 } in the plane of the sky .
We interpret this region as the ionized bowshock produced by a runaway O6 ZAMS star that was ejected from the eastern edge of Welch ’ s ring about 6,400 years ago .