A coronal mass ejection, commonly called a CME, is a burst of energy that the Sun spits out in all directions. Sometimes, Earth falls into the path of a CME. Most are very small and don't cause any effects. However, sometimes, there will be a strong CME, that will hamper radio communications and have effects on the power grids. Again, this depends on strength.
The model above is showing the strike time of this CME on Tomorrow, Labor Day, in the late morning hours. Earth does not appear to be in the direct path, so effects will not be too extreme. Watch for some radio communication issues and slight fluctuations in power grids, especially at northern latitudes. The Aurora Borealis may also extend farther south than normal.