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CW3E Landfalling AR Catalog for Oregon
Supported by "Extreme Atmospheric River Precipitation Engineering Services" in contract with WEST Consultants
Funded by the State of Oregon Water Resources Dept. S-DASOBO-00006614

Methodology:
The data source is the hourly ERA5 dataset provided by the ECMWF. We use their grid defined eastward and northward water vapor transport parameters to calculate the integrated vapor transport (IVT) magnitude and direction. The IVT magnitude information for continuously hourly periods with IVT magnitudes above 250 kg/ms satisfying the criteria of the Ralph et al. (2019) AR Scale for ranks of at least AR1 are identified and retained for climatological purposes. Subsequent catalog graphics are only performed on storms meeting rank AR3 or higher.

On 1 Feb 2023, the data were updated to include all of WY2022 (previously ended in WY2021).
Acknowledgment:
The lanfalling AR catalog was initially developed with support from (1) the California Atmospheric River (AR) Program with funding provided to CW3E by the California Department of Water Resources during Phase 3 of the Program (award #4600010378) and to CW3E by (2) the Forecast Informed Reservoir Operations (FIRO) Program with funding provided by the U.S. Army Corps of Enginners.

Funding to translate the AR catalog north into Oregon for application to the "Extreme Atmaospheric River Precipitation" project herein is provided via subcontract with WEST Consultants as part of a broader project with the State of ORegon Water Resources Deparement (S-DASOBO-00006614).
Last updated 5/23/23.