Being fairly new to beekeeping I've got a couple of questions:
 
I'm going out to pull off the last of the supers on my hives.  I've only got
3 hives.  It's all capped over and ready to extract. When I'm done
extracting I'm going to put the supers back on the hives to store for the
winter. There's two supers on each hive.
        1. My question is 'how can I tell if there is going to be enough
honey in the hive when winter sets in, here (boise, Idaho) to   keep my bees
alive? Is there a way you experienced beekeepers can tell? By weight or
something?
 
        2.  If I need to help them along before we start having freezing
weather, Can I feed them warmed up crystalized honey in         quart   jars
through a entrance feeder?
 
        3. Is storing my supers on top the active hives over the winter a
good idea?  Is this causing too much room for them to keep      warm?
 
                Thank you for all your help
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