An example of rainbands associated with stationary longitudinal circulations in the planetary boundary layer
✍ Scribed by K. A. Browning; G. W. Bryant
- Publisher
- John Wiley and Sons
- Year
- 1975
- Tongue
- English
- Weight
- 742 KB
- Volume
- 101
- Category
- Article
- ISSN
- 0035-9009
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✦ Synopsis
Abstract
Doppler radar and rawinsonde observations are presented showing the structure of some longitudinal circulations which extended downwind of hills and gave rise to stationary rainbands. The circulations occurred within a low‐level jet situated in a deep adiabatic boundary layer ahead of a moving cold front. They were several kilometres wide and up to 100km long with updraughts of about 30cm s^−1^. The layer of cloud was shallow in the present study so that the circulations gave rise to only light rain; however, in the presence of precipitation generated in the middle troposphere the airflow at low levels would be moistened and seeded and it is suggested that stationary bands of heavy rain might then occur as a result of boundary layer circulations of the kind described in this study.