31. Their predictions of an extreme decline in snow pack , alpine forests and the spread of desert areas all exceed earlier projections. 32. They are used today to measure and compare changes in snow pack , providing valuable evidence on issues such as global warming. 33. Arctic air that was pulled southward behind the storm had combined with the heavy snow pack to produce many record low temperatures. 34. The change gave groomers a chance to prepare the course, which varied between 1-6 inches of snow pack and ice. 35. "What we need is a lot of snow pack , a cold winter, " the mayor said on Friday. 36. Nearly two feet of snow fell Friday and Saturday at Powder Mountain, where the snow pack is up to 9 feet deep. 37. Freeze-thaw conditions created a weak layer on top of an existing snow pack ; further snow was then deposited on top. 38. The snow pack has begun to accumulate for another long winter in Barrow, Alaska, the northernmost weather station in the United States. 39. Collected mainly from the Sierra snow pack , tap water has been treated, filtered and chlorinated before it comes out of the pipes. 40. Temperatures rose to near freezing in the mountains, raising concerns that the snow pack could begin to melt and increase the flood risk.
