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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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