The gave will not be called off because of the pitch.
There are only two possible reasons.......
1) John Newsham and the safety team at the ground deem it to be unsafe in the stands and concourses (probably only the Riverside)
2) The police decide its to dangerous for the best part of 30,000 to descend of a snow bound Blackburn, given that the gritters have been out in force today I doubt this will be the case.
But I have been wrong before.
Anyone remember the last game that was called off cos of snow.