Two of the houses I have owned had plaster walls, and I tried to seal gaps where the walls met the floors and the roof, to reduce air intrusion. (rismedia.com)
Repeated warm air intrusions occurred over the Chukchi and Barents Seas, continuing the pattern seen in November. (nsidc.org)
He said that while warm air intrusions occur every winter, this one is unusual for occurring during February, lasting longer than a week, and for «the extent / magnitude of the moisture transport into the Arctic.» (mashable.com)