skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A Real-Time Online Data Product that Automatically Detects Easterly Gap-Flow Events and Precipitation Type in the Columbia River Gorge

Abstract

A real-time, hourly updated, online graphical data product that displays the depth and strength of easterly gap flow in the Columbia River Gorge using a 915-MHz Doppler wind profiler is presented. During precipitation events, this data product also displays observed precipitation accumulation and diagnosed precipitation type using measurements provided by a collocated heated tipping-bucket rain gauge, an optical disdrometer, and temperature and relative humidity sensors. Automated algorithms that determine the existence and depth of the gap flow, as well as precipitation type, are described. The Columbia River Gorge is the only major gap in the Cascade Mountains of Oregon and Washington. Consequently, both easterly and westerly directed gap-flow events are common in this region. Especially during late autumn and winter, easterly gap flow can cause hazardous and damaging weather (e.g., snow, freezing rain, and strong winds) in the Portland, Oregon–Vancouver, Washington metropolitan area. The product described here was developed to help forecasters at the Portland National Weather Service Forecast Office monitor cool-season easterly gap-flow events in order to provide situational awareness and guide warnings to the public about potential weather-related hazards.

Authors:
 [1];  [1];  [1];  [2];  [2]
  1. NOAA/Earth System Research Laboratory/Physical Sciences Division, Boulder, Colorado
  2. NOAA/National Weather Service Forecast Office, Portland, Oregon
Publication Date:
Research Org.:
National Oceanic and Atmospheric Administration (NOAA), Silver Spring, MD (United States). Office of Oceanic and Atmospheric Research
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1477808
Alternate Identifier(s):
OSTI ID: 1614612
Grant/Contract Number:  
EE007605; EE0007605
Resource Type:
Published Article
Journal Name:
Journal of Atmospheric and Oceanic Technology
Additional Journal Information:
Journal Name: Journal of Atmospheric and Oceanic Technology Journal Volume: 35 Journal Issue: 10; Journal ID: ISSN 0739-0572
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Engineering; Meteorology & Atmospheric Sciences; Channel flows; Freezing precipitation; Orographic effects; Algorithms; Wind profilers; Nowcasting

Citation Formats

Neiman, Paul J., Gottas, Daniel J., White, Allen B., Schneider, William R., and Bright, David R. A Real-Time Online Data Product that Automatically Detects Easterly Gap-Flow Events and Precipitation Type in the Columbia River Gorge. United States: N. p., 2018. Web. https://doi.org/10.1175/JTECH-D-18-0088.1.
Neiman, Paul J., Gottas, Daniel J., White, Allen B., Schneider, William R., & Bright, David R. A Real-Time Online Data Product that Automatically Detects Easterly Gap-Flow Events and Precipitation Type in the Columbia River Gorge. United States. https://doi.org/10.1175/JTECH-D-18-0088.1
Neiman, Paul J., Gottas, Daniel J., White, Allen B., Schneider, William R., and Bright, David R. Mon . "A Real-Time Online Data Product that Automatically Detects Easterly Gap-Flow Events and Precipitation Type in the Columbia River Gorge". United States. https://doi.org/10.1175/JTECH-D-18-0088.1.
@article{osti_1477808,
title = {A Real-Time Online Data Product that Automatically Detects Easterly Gap-Flow Events and Precipitation Type in the Columbia River Gorge},
author = {Neiman, Paul J. and Gottas, Daniel J. and White, Allen B. and Schneider, William R. and Bright, David R.},
abstractNote = {A real-time, hourly updated, online graphical data product that displays the depth and strength of easterly gap flow in the Columbia River Gorge using a 915-MHz Doppler wind profiler is presented. During precipitation events, this data product also displays observed precipitation accumulation and diagnosed precipitation type using measurements provided by a collocated heated tipping-bucket rain gauge, an optical disdrometer, and temperature and relative humidity sensors. Automated algorithms that determine the existence and depth of the gap flow, as well as precipitation type, are described. The Columbia River Gorge is the only major gap in the Cascade Mountains of Oregon and Washington. Consequently, both easterly and westerly directed gap-flow events are common in this region. Especially during late autumn and winter, easterly gap flow can cause hazardous and damaging weather (e.g., snow, freezing rain, and strong winds) in the Portland, Oregon–Vancouver, Washington metropolitan area. The product described here was developed to help forecasters at the Portland National Weather Service Forecast Office monitor cool-season easterly gap-flow events in order to provide situational awareness and guide warnings to the public about potential weather-related hazards.},
doi = {10.1175/JTECH-D-18-0088.1},
journal = {Journal of Atmospheric and Oceanic Technology},
number = 10,
volume = 35,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1175/JTECH-D-18-0088.1

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Save / Share:

Works referencing / citing this record:

Impact of model improvements on 80 m wind speeds during the second Wind Forecast Improvement Project (WFIP2)
journal, January 2019

  • Bianco, Laura; Djalalova, Irina V.; Wilczak, James M.
  • Geoscientific Model Development, Vol. 12, Issue 11
  • DOI: 10.5194/gmd-12-4803-2019