Kelvin-Helmholtz waves in extratropical cyclones passing over mountain ranges: KH Waves in Extratropical Cyclones over Mountain Ranges
- Univ. of Washington, Seattle, WA (United States). Dept. of Atmospheric Sciences
- Univ. of Washington, Seattle, WA (United States). Dept. of Atmospheric Sciences; Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Kelvin–Helmholtz billows with horizontal scales of 3–4 km have been observed in midlatitude cyclones moving over the Italian Alps and the Oregon Cascades when the atmosphere was mostly statically stable with high amounts of shear and Ri < 0.25. In one case, data from a mobile radar located within a windward facing valley documented a layer in which the shear between down-valley flow below 1.2 km and strong upslope cross-barrier flow above was large. Several episodes of Kelvin–Helmholtz waves were observed within the shear layer. The occurrence of the waves appears to be related to the strength of the shear: when the shear attained large values, an episode of billows occurred, followed by a sharp decrease in the shear. The occurrence of large values of shear and Kelvin–Helmholtz billows over two different mountain ranges suggests that they may be important features occurring when extratropical cyclones with statically stable flow pass over mountain ranges.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1331734
- Report Number(s):
- PNNL-SA-116939
- Journal Information:
- Quarterly Journal of the Royal Meteorological Society, Vol. 142, Issue 696; ISSN 0035-9009
- Publisher:
- Royal Meteorological Society
- Country of Publication:
- United States
- Language:
- English
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