Use the above brush and then under the detailed settings set
- brush tip shape --> Spacing 200%
- Shape dynamics --> Size jitter 100%
- Scattering --> Scattering both axes 775%
The result should look something like the below. 

Apply the Filter --> Blur --> Motion Blur -45 degrees, distance 15
Click Edit --> Fade Radial Blur --> 50%

Here is an example of it in use.