| 21. | The northern jet stream is what has blocked Arctic air from moving south.
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| 22. | Lake-effect snows will intensify downwind of Lake Michigan as Arctic air charges eastward.
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| 23. | The forecast indicates that cold Arctic air will not penetrate very far south.
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| 24. | Beneath that lies a large mass of cold, dense arctic air.
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| 25. | Snow showers will accompany a mound of Arctic air approaching the northern Plains.
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| 26. | As a result, Arctic air over Canada will be prevented from advancing southward.
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| 27. | Initially Arctic Air operated two Cessna 206 seaplanes, mostly in Kautokeino.
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| 28. | The leading edge of an Arctic air mass will seep into northern Montana.
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| 29. | Another dome of arctic air is sprawled across the Plains and Great Lakes states.
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| 30. | The culprit is a blast of arctic air from Canada.
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