Yes thats normal. Playing 100+ patrols in NYGM AM 11-15 is heavily patrolled by air which are based on an airbase at the coastline of scotland in AM 13.
Unlike in gwx heavy clouds and low visibility wont protect u against air attacks. I use sh3gen to get all their airbases into my map. Unless i hunt in those grids i recharge my batteries only during nighttime and run submerged during daytime even in oct. 39. If i need to recharge daytime i do it full stop. Attacking ships in those grids i must not wait longer then 20 min to see hurricanes looking for me.
I suspect this airbase has radar which picks u up on the surface as soon as u move.
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