ARCTIC Cold Air Drainage West of Fort Nelson, British Columbia
ABSTRACT. In the early mornings of 7,22 and 23 January 1982, intense cold air drainage was observed in the valleys on the eastern slopes of the Rocky Mountains west of Fort Nelson, British Columbia. Temperature differences of 31°C were noted, the coldest temperature recorded being-71°C (a new North...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.4865 http://pubs.aina.ucalgary.ca/arctic/arctic35-4-537.pdf |
| Summary: | ABSTRACT. In the early mornings of 7,22 and 23 January 1982, intense cold air drainage was observed in the valleys on the eastern slopes of the Rocky Mountains west of Fort Nelson, British Columbia. Temperature differences of 31°C were noted, the coldest temperature recorded being-71°C (a new North American record), though even colder temperatures probably occurred at other sites. These were produced by an intense cold arctic high-pressure cell which gave regionally still air and clear skies and permitted marked local cooling during the nights. Similar conditions should be expected elsewhere along the slopes of the Rocky Mountains in northern B.C. and southern Yukon Territory. RÉSUMÉ. Durant les premi&res heures matinales des 7, 22 et 23 janvier 1982, un reseau d'air intensement froid fut ressenti dans les vallees du versant est des Rocheuses, B l'ouest de Fort Nelson, en Colombie-Britannique. Une difference de temptrature de 31 " C fut enregistree, la tempkrature la plus froide ayant une indication au mercure de-71 " C (un nouveau record nord-amCriCain), bien que d'autres sites ont probablement ressenti des temperatures plus basses encore. Ces temperatures ont CtC produites par une haute pression de froid arctique intense qui entraîna un condition atmosphtrique calme dans la rCgion ainsi qu'un ciel degage, accompagnC d'un refroidissement local marquC pendant les nuits. Des conditions semblables existent probablement le long des pentes des Rocheuses dans le nord de la C.-B. et le sud du Yukon. Traduit pour le journal par Maurice Guibord. |
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