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The inland penetration of atmospheric rivers over Western North America: A Lagrangian analysis

TitleThe inland penetration of atmospheric rivers over Western North America: A Lagrangian analysis
Publication TypeJournal Article
Year of Publication2015
AuthorsRutz J.J, Steenburgh W.J, Ralph FM
JournalMonthly Weather Review
Date Published2015/05
Type of ArticleArticle
ISBN Number0027-0644
Accession NumberWOS:000354094000025
Keywordscalifornia; Climatology; diagnosis; landfall; pacific-ocean; precipitation event; satellite; tropical moisture exports; tropospheric rivers; united-states

Although atmospheric rivers (ARs) typically weaken following landfall, those that penetrate inland can contribute to heavy precipitation and high-impact weather within the interior of western North America. In this paper, the authors examine the evolution of ARs over western North America using trajectories released at 950 and 700 hPa within cool-season ARs along the Pacific coast. These trajectories are classified as coastal decaying, inland penetrating, or interior penetrating based on whether they remain within an AR upon reaching selected transects over western North America. Interior-penetrating AR trajectories most frequently make landfall along the Oregon coast, but the greatest fraction of landfalling AR trajectories that eventually penetrate into the interior within an AR is found along the Baja Peninsula. In contrast, interior-penetrating AR trajectories rarely traverse the southern "high'' Sierra. At landfall, interior-penetrating AR trajectories are associated with a more amplified flow pattern, more southwesterly (vs westerly) flow along the Pacific coast, and larger water vapor transport (qv). The larger initial qv of interior-penetrating AR trajectories is due primarily to larger initial water vapor q and wind speed v for those initiated at 950 and 700 hPa, respectively. Inland- and interior-penetrating AR trajectories maintain large qv over the interior partially due to increases in v that offset decreases in q, particularly in the vicinity of topographical barriers. Therefore, synoptic conditions and trajectory pathways favoring larger initial qv at the coast, limited water vapor depletion by orographic precipitation, and increases in v over the interior are keys to differentiating interior-penetrating from coastal-decaying ARs.

Short TitleMon. Weather Rev.
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