Synoptic atmospheric circulation patterns associated with deep persistent slab avalanches in the western United States
نویسندگان
چکیده
Abstract. Deep persistent slab avalanches are capable of destroying infrastructure and usually unsurvivable for those who caught. Formation a snowpack conducive to deep is typically driven by meteorological conditions occurring in the beginning weeks months winter season, yet avalanche event may not occur several later. While predicting exact timing release difficult, onset activity commonly preceded rapid warming, heavy precipitation, or high winds. This work investigates synoptic drivers at three sites western USA with long records: Bridger Bowl, Montana; Jackson, Wyoming; Mammoth Mountain, California. We use self-organizing maps generate 20 types that summarize 5899 daily 500 mbar geopotential height winters (November–March) 1979/80–2017/18. For each locations, we identify major minor seasons analyze number days represented type during (November–January) seasons. also examine assigned 72 h preceding both dry wet events. Each exhibits unique distribution November–January period activity. identifies synoptic-scale atmospheric circulation patterns contributing instabilities precede By identifying these patterns, provide an improved understanding additional tool anticipate difficult-to-predict
منابع مشابه
Large-scale atmospheric circulation patterns associated with the occurrence of severe storms Zab basin
متن کامل
large-scale atmospheric circulation patterns associated with the occurrence of severe storms zab basin
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ژورنال
عنوان ژورنال: Natural Hazards and Earth System Sciences
سال: 2021
ISSN: ['1561-8633', '1684-9981']
DOI: https://doi.org/10.5194/nhess-21-757-2021