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(MPEG movie of an ARPS simulation)

The Advanced Regional Prediction System

The Advanced Regional Prediction (ARPS) is a comprehensive regional to stormscale atmospheric modeling / prediction system. It is a complete system that includes a realtime data analysis and assimilation system, the forward prediction model and a post-analysis package.

The ARPS was initially developed at the Center for Analysis and Prediction of Storms (CAPS) at the University of Oklahoma, under the support of the National Science Foundation Science and Technology Center (STC) program. CAPS will continue to improve and support the use of ARPS.

The original goal of ARPS was for it to serve as a prototype system for storm scale numerical weather prediction. Developing such a system was also the primary mission of CAPS. ARPS is also suitable for a wide range of idealized studies.

ARPS Version 4.0 was officially released to the public in 1995. Since then, significant improvements have been added and subsequent subversions released. ARPS Version 4.5.2 is our last Fortran 77 version. Starting from ARPS version 5, Fortran 90 free format, dynamic array allocations as well as other features are used. This version has been used internally for over years, and the latest version of it is available from the download page. For the current status of ARPS, visit What's New page.

We do welcome feedbacks and appreciate acknowledgment of the use of ARPS and its components.