Nothing says “disappointment” like getting up at 0400 for magic hour only to get there and clouds roll in. When this happens go find a coffee shop and relaxes, give the day some time to brighten a little more and think about sifting your creative minds into detail mode.
We as photographers, love having overcast days to shoot people photos because of the soft light fill in the shadows. I start looking to do some intimate more close up images. Just wish I would have stayed in bed longer.