Timing
could well be better. According to another story, a solar plasma aurora storm is due to hit Earth, starting "early in the day on August 4th". I know this is Wednesday, but I believe that the storm will last a while.
If I were in the ISS, and not protected by the bulk of the Earth's magnetic field, I would want to find the most shielded part of the station and chill out for a few days, rather than going on a space walk. I guess that the boffins will have taken this into account.
Anybody got any idea whether the ISS is in a low enough orbit to be mostly protected, or is the space walk scheduled when it is in the Earth's shadow (I know some of the remains of the plasma will reach the far side, but it will be less).