11.   Glaze is possible over northern New England where the near surface air remains below freezing.

12.   HSI considers the current surface air temperature along with the relative humidity.

13.   However, severe icing only occurs when either the frigid air cannot be dislodged or gelid surface air is replenished from a new source.

14.   If completely opened to surface air, the cave would dry out in a week, Travous said.

15.   In turn, this diverging air allowed surface air pressures to lower.

16.   In this way, a continuous supply of surface air can be supplied to the divers, who then will be able to work longer on the bottom.

17.   Instead, pockets of surface air, heated by the warming earth, ascend through a cold upper atmosphere, often forming showers.

18.   Instead, pockets of surface air, heated by the warming earth, ascend through a relatively cold upper atmosphere, often forming more localized showers.

19.   In the wake of strong cold fronts from the Pacific, arriving surface air is mild, having been tempered by tepid ocean waters.

20.   Instead, pockets of surface air, heated by the warming earth, ascend through a cold upper atmosphere often forming the showery rains of April.