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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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