You may want to cut back on the humidifier.
What is happening is that the moistrure in your home is getting by your inside windows and is being caught by the storms.
This is very common with older, inside windows.
Ventilation and reducing the moisture in the air should cut down, or get rid of this problem.
Let's face it, this is one of the coldest winters we've had in quite some time. I have seen more post about condensation than I have for rabbit hutches.
You could put a pencil in the bottom of the storm window track but, it kind of defeats the purpose of the storm.
Good luck and post back with an update,
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