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Use of high-resolution NWP rainfall and river flow forecasts\ud for advance warning of the Carlisle flood, north-west\ud England

By Nigel M. Roberts, Steven J. Cole, Richard M. Forbes, Robert J. Moore and Daniel Boswell


On the 8 January 2005 the city of Carlisle in northwest England was severely flooded following two days of almost continuous rain over the nearby hills. Orographic enhancement of the rain through the seeder-feeder mechanism led to the very high rainfall totals. This paper shows the impact of running the Met Office Unified Model (UM) with a grid spacing of 4 and 1 km compared to the 12 km available at the time of the event. These forecasts, and forecasts from the Nimrod nowcasting system, were fed into the Probability Distributed Model (PDM) to predict river flow at the outlets of two catchments important for flood warning. The results show the benefit of increased resolution in the UM, the benefit of coupling the high-resolution rainfall forecasts to the PDM and the improvement in timeliness of flood warning that might have been possible

Topics: Meteorology and Climatology, Earth Sciences, Hydrology, Atmospheric Sciences
Publisher: Wiley
Year: 2009
DOI identifier: 10.1002/met.94
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