Abstract
The Weather Research and Forecasting (WRF) model is a numerical weather prediction and atmospheric simulation system designed for both research and operational applications. It was fine tuned to forecast precipitation over Nilwala river basin in Sri Lanka by investigating the impacts of its physics options on precipitation forecasting. In model fine tuning, impacts of microphyics schemes, cumulus schemes, land surface schemes, boundary layer schemes and long/shortwave schemes were investigated. Model predictions were compared with observed point rainfall data for three rainfall events to find reasonably good physics combinations. It was seen that the model combination, Ferrier microphysics scheme, Kain-Fritsch cumulus scheme, Rapid Update Curve land surface scheme, Yonsei boundary layer scheme, Rapid Radiative Transfer model longwave radiation scheme and Dudhia shortwave scheme yields good precipitation predictions over the basin when compared with the other physics combinations tested.
Highlights
Human activities and many sectors of economy depend on weather and climate in different ways
There are many different techniques involved in weather forecasting, from relatively simple observation of the sky to highly complex numerical models run on computers
Weather Research and Forecasting (WRF 3.0) model is a numerical weather prediction and atmospheric simulation system designed for both research and operational applications
Summary
Human activities and many sectors of economy depend on weather and climate in different ways. The process of ingesting the output of a global model into a regional model and predicting future weather conditions is called downscaling of weather. Weather Research and Forecasting (WRF 3.0) model is a numerical weather prediction and atmospheric simulation system designed for both research and operational applications. It falls into the category of regional weather models. Microphysics scheme, cumulus scheme, land surface scheme, boundary layer scheme and long/short wave radiation schemes are the different physics schemes available in the WRF model Each of these physics schemes contains diverse options that could be selected to suit to local conditions. Kumar et al (2008) studied its applicability in India while Pathirana (2005) used it to forecast rainfall in Mekong basin. Heikkila et al (2008) investigated its use for Norway
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