Not sure if this is GWX related. My friend and I have both experienced rain and lightning on a clear day with GWX install. It will be clear, sunny, and calm seas and yet it will rain, thunder, and lightning (flashes). There is also sound effects of a strong storm yet the weather reports calm weather. As you can see there isn't a cloud in the sky, the wind and water allows me to go on deckguns, and the sun is out in the open just over the reflection in the water.
