You probably already know this, but at the risk of stating the obvious, here goes.
Unlike a regular old circuit breaker that simply looks for excess current in a circuit, a ground fault circuit interupter is actually comparing the current flow in the "hot" wire to the current flow in the "neutral" wire. If the current flow in those two wires is not exactly the same, the gfci trips.
And it does so for good reason. The current in those two wires SHOULD be exactly the same. If it is not, it indicates that voltage is draining off to ground somewhere in the circuit (like a short inside a power tool that would cause a shock to a person that touchs it).
So, if your gfci is tripping, it's an indication that current is flowing in the circuit and that the current in the "hot" wire and the "neutral" wire are not the same.
Do these gfci's have things plugged into them when they trip during the electrical storm? That might be an interesting thing to check out. If so, and if it's possible for you to do so, you might unplug everything the next time a storm is coming and see what happens.
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Today's Featured Article - 1952 Ferguson TO30 Restoration Story - by Mike Mc Andrews. I have been planning for many years to build a home and in preparation for this, I decided that I should have a tractor to prepare a driveway, do landscaping and haul material on my acre of land. I have a Cub Cadet for tilling and mowing but I decided that I needed something larger and with a loader. I enjoy repairing things and I like to save some money so I purchaced a 1952 Ferguson TO-30 with a Wagner loader.
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