Next Article in Journal
Sources and Health Risks of Heavy Metals in PM2.5 in a Campus in a Typical Suburb Area of Taiyuan, North China
Next Article in Special Issue
Moist Orographic Convection: Physical Mechanisms and Links to Surface-Exchange Processes
Previous Article in Journal
ECMWF Atmospheric Profiles in Maroua, Cameroon: Analysis and Overview of the Simulation of Downward Global Solar Radiation
Previous Article in Special Issue
The Peñalara Mountain Meteorological Network (1999–2014): Description, Preliminary Results and Lessons Learned
Open AccessArticle

Observations and Predictability of Gap Winds in the Salmon River Canyon of Central Idaho, USA

US Forest Service, Rocky Mountain Research Station, Missoula Fire Sciences Laboratory, 5775 W Highway 10, Missoula, MT 59808, USA
National Oceanic and Atmospheric Administration, National Weather Service, Missoula, MT 59808, USA
Washington State University, Laboratory for Atmospheric Research, Pullman, WA 99164, USA
Author to whom correspondence should be addressed.
Atmosphere 2018, 9(2), 45;
Received: 30 November 2017 / Revised: 23 January 2018 / Accepted: 29 January 2018 / Published: 31 January 2018
(This article belongs to the Special Issue Atmospheric Processes over Complex Terrain)
This work investigates gap winds in a steep, deep river canyon prone to wildland fire. The driving mechanisms and the potential for forecasting the gap winds are investigated. The onset and strength of the gap winds are found to be correlated to the formation of an along-gap pressure gradient linked to periodic development of a thermal trough in the Pacific Northwest, USA. Numerical simulations are performed using a reanalysis dataset to investigate the ability of numerical weather prediction (NWP) to simulate the observed gap wind events, including the timing and flow characteristics within the canyon. The effects of model horizontal grid spacing and terrain representation are considered. The reanalysis simulations suggest that horizontal grid spacings used in operational NWP could be sufficient for simulating the gap flow events given the regional-scale depression in which the Salmon River Canyon is situated. The strength of the events, however, is under-predicted due, at least in part, to terrain smoothing in the model. Routine NWP, however, is found to have mixed results in terms of forecasting the gap wind events, primarily due to problems in simulating the regional sea level pressure system correctly. View Full-Text
Keywords: gap wind; complex terrain; numerical weather prediction gap wind; complex terrain; numerical weather prediction
Show Figures

Figure 1

MDPI and ACS Style

Wagenbrenner, N.S.; Forthofer, J.M.; Gibson, C.; Indreland, A.; Lamb, B.K.; Butler, B.W. Observations and Predictability of Gap Winds in the Salmon River Canyon of Central Idaho, USA. Atmosphere 2018, 9, 45.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop