Tire pressures for driving in snow/slush?

[David]

Any suggested changes from norm? I tend to run higher pressures than what is listed in the manual. I'm running 33 PSI at all corners right now. Tomorrow we leave for a long weekend trip that likely will involve some snowey conditions. Thoughts on whther to raise or lower the pressure? Right now the car has Kumho HP4 tires in size 185/60/14 on the stock ronal wheels (removed the 15" Borbets a week or two ago, stored for the winter). 

Dave
87.5 CGT
SE Virginia