P1.39 Precipitation extreme downstream of a mountain

Monday, 1 August 2005
Regency Ballroom (Omni Shoreham Hotel Washington D.C.)
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.
- Indicates paper has been withdrawn from meeting
- Indicates an Award Winner