Investigations of a Winter Mountain Storm in Utah. Part I: Synoptic Analyses, Mesoscale Kinematics, and Water Release Rates
| Autor: | Arlen W. Huggins, Alexis B. Long, Bernard Campistron |
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| Rok vydání: | 1990 |
| Předmět: | |
| Zdroj: | Journal of the Atmospheric Sciences. 47:1302-1322 |
| ISSN: | 1520-0469 0022-4928 |
| DOI: | 10.1175/1520-0469(1990)047<1302:ioawms>2.0.co;2 |
| Popis: | A winter storm passing across the north–south-orientated Tushar Mountains in southwest Utah is investigated in this multipart paper. This Part I describes the evolving synoptic pattern, mesoscale kinematics, and calculated water release rates (condensation or deposition) in clouds over the western upstope part of the mountains. Horizontal mesoscale kinematic variables come from direct application of Volume Velocity Processing to single C-band Doppler radar data. Water release rates are computed from updrafts derived from the radar data and from the vertical gradient of saturation mixing ratio obtained from soundings. In Stage I of the storm altostratus was present on the leading side of a long-wave trough. Weak updrafts occurred only at the higher altitudes within the clouds where there was convergence and large-scale synoptically forced lift. Downdrafts as great as −0.6 m s−1 occurred in the lower parts of the cloud where there was divergence. The downdrafts were induced in part by sublimation c... |
| Databáze: | OpenAIRE |
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