21st Conference on Weather Analysis and Forecasting/17th Conference on Numerical Weather Prediction


Precipitation extreme downstream of a mountain

Haraldur Ólafsson, University of Iceland, IS 150 Reykjavík, Iceland; and T. Jónsson

The absolute precipitation record of Iceland (293 mm/24hrs on 10 January 2002) is studied by means of a numerical simulation. The precipitation record was exceptional in the sense that the observation was made downstream of a 2119 m high mountain, and not upstream of the mountain. A numerical simulation reproduces a secondary maximum in rain water over the lee slope of the mountain. This maximum appears to be associated with horizontal convergence in the flow over the lee slope, leading to concentration of the spill-over rain. The horizontal convergence is associated with a moderately amplified mountain wave.

Poster Session 1, Conference Posters
Monday, 1 August 2005, 5:30 PM-7:00 PM, Regency Ballroom

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