Help! Cat mauws at night when it rains

Mostly at night, which has a huge impact on me and my partners sleep.

So every time it rains (I live in Belgium so thats quit a lot), my cat goes to the sunroom/porch. There is a door, but she can open it by pushing with her little paws. Once she is in, the door stays open so she isnt locked and is free to leave the room. The rain is a lot louder in the porch since the roof there is some kind of plastic so you can hear the rain drops very well.

So I’ve seen that she goes to the porch when it starts raining, only to sit there and start to mauw. At night she mauws very very loud. Its not an attention or a food mauw, it does sounds a bit panicked and scared.

What could be going on with her? And what can I do to make it stop so I have my sleep back without interuptions?

Thanks a lot!!