| 31. | Blizzard warnings were issued for northern Montana on Friday as a bitterly cold Arctic air mass crossed the Canadian border.
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| 32. | Because this region is surrounded by mountains, it is cut off from the Asian monsoon and from Arctic air masses.
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| 33. | For instance, an Arctic air mass blowing out over the Gulf of Alaska may be shown as " cA-mPk ".
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| 34. | Arctic air masses in their wake are shallow with a deep layer of stable air above the shallow cold cool.
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| 35. | At night, clear, calm conditions promote rapid cooling, completing one cycle in the production of Arctic air masses in spring.
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| 36. | In winter the Danubian Plain falls under the influence of the Eastern European anticyclone, which brings cold Arctic air masses.
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| 37. | Located near the beginning of the Aleutian archipelago, arctic air masses are typically modified by surrounding waters before reaching Cold Bay.
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| 38. | Unusual chill will persist from the northern Rockies to the northern Plains as a shallow Arctic air mass remains in place.
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| 39. | An arctic air mass settled across the far northern Plains will cause temperatures to average 6 to 10 degrees below normal.
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| 40. | On Monday, temperatures fluctuated wildly as a shallow Arctic air mass sloshed in and out of valleys in the Northern Rockies.
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