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Performance of neural networks in forecasting short range occurrence of rainfall

Authors:

V.S. Rathnayake,

Department of Computation & Intelligent Systems, University of Colombo School of Computing, 35, Reid Avenue, Colombo 07., LK
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H.L. Premaratne,

Department of Computation & Intelligent Systems, University of Colombo School of Computing, 35, Reid Avenue, Colombo 07., LK
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D.U.J. Sonnadara

Department of Physics, Faculty of Science, University of Colombo, Colombo 03., LK
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Abstract

The performance of artificial neural networks in forecasting short range (3-6 hourly) occurrence of rainfall is presented. Feature sets extracted from both surface level weather parameters and satellite images were used in developing the networks. The study was limited to forecasting the weather over Colombo (79°52’ E, 6°54’ N), the capital of Sri Lanka. From the available ground level weather parameters, a total of seven parameters, namely, pressure, temperature, dew point, wind direction, wind speed, cloud amount and rainfall were selected for the present study. From satellite images, four types of images viz., visible image of clouds, infrared image of clouds, infrared colour image of clouds and water vapour image of clouds were used. The best performance was observed for hybrid models that combine ground level and satellite observations, with 75% accuracy for short range forecasting. A strong seasonal dependence in the accuracy of forecasting linked to monsoons was observed.

Keywords: Neural networks, nowcasting, precipitation, weather forecasting.

Doi: 10.4038/jnsfsr.v39i3.3629

J.Natn.Sci.Foundation Sri Lanka 2011 39 (3): 251-260

How to Cite: Rathnayake, V.S., Premaratne, H.L. & Sonnadara, D.U.J., (2011). Performance of neural networks in forecasting short range occurrence of rainfall. Journal of the National Science Foundation of Sri Lanka. 39(3), pp.251–260. DOI: http://doi.org/10.4038/jnsfsr.v39i3.3629
Published on 27 Sep 2011.
Peer Reviewed

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