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the claim

Atmospheric rivers produce more heavy precipitation on western coasts due to prevailing westerlies and topography

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Atmospheric rivers frequently drive heavy precipitation along western coasts as moisture-laden winds interact with coastal mountain ranges.

The analysis

The retrieved literature consistently confirms that atmospheric rivers, steered by prevailing westerlies, encounter coastal topography and produce heavy orographic precipitation along western coasts such as western North America and New Zealand.

Evidence for · 5
Atmospheric rivers induced heavy precipitation and flooding in the western U.S. simulated by the WRF regional climate model
Recorded source metadata

L. Ruby Leung, Yun Qian. Atmospheric rivers induced heavy precipitation and flooding in the western U.S. simulated by the WRF regional climate model. 2009. https://doi.org/10.1029/2008gl036445

Simulations demonstrate how atmospheric rivers cause heavy precipitation and flooding in the western U.S.

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More for · 4
Contribution of Atmospheric Rivers to Annual, Seasonal, and Extreme Precipitation Across British Columbia and Southeastern Alaska
Recorded source metadata

Aseem R. Sharma, S. Déry. Contribution of Atmospheric Rivers to Annual, Seasonal, and Extreme Precipitation Across British Columbia and Southeastern Alaska. 2020. https://doi.org/10.1029/2019JD031823

Shows that prevailing midlatitude westerlies drive atmospheric rivers that produce heavy coastal precipitation in British Columbia and Alaska.

Impacts of Hydrometeor Drift on Orographic Precipitation: Two Case Studies of Landfalling Atmospheric Rivers in British Columbia, Canada
Recorded source metadata

R. Mo, M. Brugman, J. Milbrandt, J. Goosen, Qu Geng, Chris Emond, Jonathan Bau, A. Erfani. Impacts of Hydrometeor Drift on Orographic Precipitation: Two Case Studies of Landfalling Atmospheric Rivers in British Columbia, Canada. 2019. https://doi.org/10.1175/WAF-D-18-0176.1

Examines how landfalling atmospheric rivers interact with topography to produce orographic precipitation in British Columbia.

The impact of atmospheric rivers on rainfall in New Zealand.
Recorded source metadata

Shu J, Shamseldin AY, Weller E. The impact of atmospheric rivers on rainfall in New Zealand.. 2021. https://doi.org/10.1038/s41598-021-85297-0

Quantifies how atmospheric rivers generate heavy rainfall totals and extreme events on the western side of mountainous areas in New Zealand.

Moisture transport to British Columbia’s upper Nechako Watershed associated with three atmospheric rivers
Recorded source metadata

Tamar S. Richards-Thomas, Stephen J. Déry. Moisture transport to British Columbia’s upper Nechako Watershed associated with three atmospheric rivers. 2025. https://doi.org/10.1007/s44292-025-00035-9

Demonstrates that moisture transport from atmospheric rivers undergoes orographic lifting over coastal mountains to produce intense precipitation.

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first checked02 Aug 2026
judged → SUPPORTED · 9002 Aug 2026
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