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Daily Procedure for GLFS Nowcasts

by Chieh-Cheng J. Yen, Ohio State Univ, Columbus, United States,
John G. W. Kelley, Ohio State Univ, Columbus, United States,
Keith W. Bedford, Ohio State Univ, Columbus, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

The Great Lakes Forecasting System (GLFS) is an integrated system involving three levels of computational power for making predictions. GLFS consists of three-dimensional numerical circulation and wave models on supercomputer, data assimilation, objective analysis, results rendering and verification on workstations, and images downloading and viewing on personal computers. Currently, GLFS is used to provide daily nowcasts (i.e. current status) for Lake Erie valid at 1200 UTC (0700 EST). A chain of commands are issued from the workstation to gather and perform the objective analysis of the atmospheric data, send the data and control parameters to the Ohio Supercomputer Center Cray Y-MP to perform a 24-hour simulation. Two-dimensional variables such as vertical integrated water velocity components, water surface elevation, wave heights and directions, and three-dimensional variables such as three components of water velocity, temperature, salinity (concentration), vertical diffusivity are calculated and saved. The output are sent back to the workstation for generating the images of 2-D surface and time series plots and conducting the evaluation. The images are compressed together and ready for downloading via modem or the Internet.

Subject Headings: Data analysis | Computer models | Lakes | Computer analysis | Water resources | Forecasting | Computer aided operations | Great Lakes | Lake Erie | Ohio | United States

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