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Atmosphere 2018, 9(6), 233; https://doi.org/10.3390/atmos9060233

Snow Level Characteristics and Impacts of a Spring Typhoon-Originating Atmospheric River in the Sierra Nevada, USA

1
Division of Atmospheric Sciences, Desert Research Institute, Reno, NV 89512, USA
2
Western Regional Climate Center, Desert Research Institute, Reno, NV 89512, USA
Received: 24 May 2018 / Revised: 11 June 2018 / Accepted: 13 June 2018 / Published: 15 June 2018
(This article belongs to the Special Issue Tropical Cyclones and Their Impacts)
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Abstract

On 5–7 April 2018, a landfalling atmospheric river resulted in widespread heavy precipitation in the Sierra Nevada of California and Nevada. Observed snow levels during this event were among the highest snow levels recorded since observations began in 2002 and exceeded 2.75 km for 31 h in the northern Sierra Nevada and 3.75 km for 12 h in the southern Sierra Nevada. The anomalously high snow levels and over 80 mm of precipitation caused flooding, debris flows, and wet snow avalanches in the upper elevations of the Sierra Nevada. The origin of this atmospheric river was super typhoon Jelawat, whose moisture remnants were entrained and maintained by an extratropical cyclone in the northeast Pacific. This event was notable due to its April occurrence, as six other typhoon remnants that caused heavy precipitation with high snow levels (mean = 2.92 km) in the northern Sierra Nevada all occurred during October. View Full-Text
Keywords: atmospheric river; avalanche; debris flow; flooding; snow level; typhoon atmospheric river; avalanche; debris flow; flooding; snow level; typhoon
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Hatchett, B.J. Snow Level Characteristics and Impacts of a Spring Typhoon-Originating Atmospheric River in the Sierra Nevada, USA. Atmosphere 2018, 9, 233.

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