If you're just in Yosemite Valley, there's no problem whatsoever. The snow is very low still (maybe 7,000 feet) and, with the warm weather of the last few days, the rivers will rise significantly, but not "flash" floods. You'll know about it in plenty of time.
That's not true of the high country -- a hiking trip. There's really a lot of snow and travel would be very difficult and even dangerous with very high river and stream crossings where there are no bridges. You could get into Little Yosemite Valley without any trouble, but I wouldn't go much farther.
But the Valley itself will be terrific. I'd go.
George
