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Connecting local‐scale heavy precipitation to large‐scale meteorological patterns over Portland, Oregon
Author(s) -
Aragon Christina M.,
Loikith Paul C.,
McCullar Nicholas,
Mandilag Arnel
Publication year - 2020
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.6487
Subject(s) - precipitation , geopotential height , climatology , environmental science , synoptic scale meteorology , atmospheric circulation , storm , cyclogenesis , winter storm , precipitation types , atmospheric sciences , cyclone (programming language) , meteorology , geology , geography , field programmable gate array , computer science , computer hardware
Identifying and characterizing the large‐scale meteorological patterns (LSMPs) associated with local‐scale heavy precipitation improve our understanding of the processes that drive these high‐impact phenomena. Focusing on Portland, Oregon, we identify and characterize the key LSMPs associated with heavy precipitation days, defined using a daily total and hourly intensity threshold. LSMPs are defined at the synoptic scale using sea level pressure, 500 hPa geopotential height (Z500), and 250 hPa wind speed concurrent with precipitation days between 1980 and 2016, to capture synoptic circulation at three diagnostic atmospheric levels. We employ the self‐organizing map (SOM) approach to group the LSMPs into clusters, spanning the full range of synoptic circulation patterns associated with heavy precipitation days across the seasonal cycle. Using an atmospheric river (AR) catalogue of events, we show that ARs are commonly associated with heavy precipitation days, especially in winter and fall; however, heavy precipitation can occur without an AR in all seasons. Spring and summer heavy precipitation days, which are less common than in the fall and winter, tend to be primarily associated with upper level troughs and localized convective precipitation, while in winter they are more commonly associated with a surface cyclone and more widespread, stratiform precipitation. Examination of two case studies, one occurring in summer and one in winter, supports the ability of the SOM approach to realistically capture key observed storm types. Methods developed here may be extensible to other locations and phenomena and results build an observational foundation for assessing impactful LSMPs in climate models.

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