[dad911]

I suspect an issue with the neutral line, possibly corroded connection, that worsens with a storm. That will 'unbalance the load' causing a higher voltage on 1 leg, lower on the other. A simplified explanation is they provide approximately 230 V to a house, neutral is in between, 115+115 = 230. Neutral keeps it balanced. If the neutral has resistance, there will be a voltage 'drop' depending on current drawn, but the 230(ish) won't change. could end up with 130 + 100 = 230. I think another user here had the same problem, maybe Baz?

My son had that issue, lights flickering, sometimes bright and burning out. We could actually measure higher voltages on 1 leg of the power. Power company finally sent someone out and they found a bad neutral outside.