Why does the hum stop on stormy weather?

I have been thinking about this for years, as I know it does stop the hum 
for a period. I thought for a long time that it just masked the hum nose, 
but no it does stop it.

Irrespective of the hum being man made, or natural or a combination of 
both, we do get the hum hitting us, through the air as a medium, as we hear 
the 'sound' of it, (again, there is the seperate ongoing discussions of it 
either being an acustic sound or a magnetic wave causing the sound in our 
ear?, so I am avoiding all that by calling it a 'sound'). 

This hum sound signal would be disrupted by a storm, as the air is 
turbulent, plus heavy rain with it could have a dissipating effect.

Also we have to consider the dreaded ground signal of the hum, as not only 
do we suffer an above ground signal through the air, we also hear and 
'REALLY FEEL' the hum through our pillow at night, coming from below us, 
ie, the ground, This is the effect that gives us the headaches, it also can 
get into the spine, nervous system, and causes lack of sleep and if we do 
sleep it causes us to wake up feeling worse than when we went to bed. I 
always use a foam earplug when the ground signal though the pillow is high. 
(I even once bought a pillow with a built-in speaker for an IPOD, but a 
foam plug to stop aircraft noise is best, as it works better because it 
fills the ear cavity).

The funny thing this ground signal through the pillow is no longer present 
without the air signal, Why who knows?, but we get a good nights sleep 
without the effects of the hum during a storm.  


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