The mountain-forecast site always predicts way more than reasonable amounts of snow. You should also check the NOAA site at the top of the Whitney Weather page (link above on the left). I think they are way more accurate.

Here's for about Trail Camp,   this for the summit.

The summit weather looks crazy: Sunday, high ~38, wind gusts to 65 mph!!!

I would wait out the storm, and go later. With a few inches of snowfall, mini spikes on the trail would be helpful.