alt Hacker News24. Check your attic. If snow blows in there because your roof is damaged then it will melt and slowly turn your entire house into fungi. The damage to your roof can be so tiny you wouldn't spot it and your attic could still fill up during a snow storm.
It should frankly be nr 1. At least if you ask any Scandinavian dad.
This is a concern of mine, and my attics (3 of them due to the way the house is built) are pretty inconvenient to check, so I put some battery-powered temp/humidity sensors in them.
Haven't gotten around to setting up any alerting thresholds though... I'm not actually entirely sure what temp/humidity thresholds would actually be useful.