The Ensemble Verification System (EVS)

[Last updated: June 3, 2013]

Overview of the EVS

The EVS was designed to verify ensemble forecasts of hydrologic and hydrometeorological variables, such as temperature, precipitation, streamflow, and river stage, issued at discrete forecast locations (points or areas). The EVS is a Java application and will run on any operating system with a suitable Java Virtual Machine (it is currently tested on Linux and Windows). It is intended to be flexible, modular, and open to accommodate enhancements and additions by its developers and users. As such, we welcome your participation in the continuing development of the EVS toward a versatile and standardized tool for ensemble verification. The software is currently provided without technical support. However, we welcome collaborations, suggestions and bug reports, for which a reporting template is provided with the distribution.

Reference Papers

• Brown J.D., Demargne J., Seo D-J., and Liu Y. (2010) The Ensemble Verification System (EVS): a software tool for verifying ensemble forecasts of hydrometeorological and hydrologic variables at discrete locations. Environmental Modelling and Software, 25(7), 854-872.
• Demargne J., Brown J.D., Liu Y., Seo D-J., Wu L., Toth Z., and Zhu Y. (2010) Diagnostic verification of hydrometeorological and hydrologic ensembles. Atmospheric Science Letters, 11 (2), 114-122.

Release History

• EVS Version 5.0: released in May 2013.
• EVS Version 4.0: released in January 2012.
• EVS Version 3.0: released in February 2011.
• EVS Version 2.0: released in October 2009.
• EVS Version 1.0: released in May 2008.

Download Current Version

Version	Full Download	User’s Manual	Executable	Release Notes	Test Data	Source Code	Developer Docs.	Bug Template
5.0 (05/28/13)	(42.8 MB)	(2.9 MB)	(16.6 MB)	(435 KB)	(3.2 MB)	(17.2 MB)	(2.1 MB)	(2 KB)

Download Old Versions

Version	Full Download	User’s Manual	Executable	Release Notes	Test Data	Source Code	Developer Docs.	Bug Template
4.0 (01/17/12)	(16.6 MB)	(2.9 MB)	(8.5 MB)	(192 KB)	(1.7 MB)	(1.7 MB)	(1.9 MB)	(1 KB)
3.0 (04/15/11)	(25.9 MB)	(2.7 MB)	(13.3 MB)	(126 KB)	(1.7 MB)	(7.2 MB)	(1.7 MB)	(2 KB)
2.0 (10/16/09)	(25.4 MB)	(2.4 MB)	(13.3 MB)	(54 KB)	(1.7 MB)	(7.1 MB)	(1.5 MB)	(2 KB)

Disclaimer

This software and related documentation was developed by the National Weather Service (NWS). Pursuant to title 17, Section 105 of the United States Code this software is not subject to copyright protection and therefore may be used, copied, modified, and distributed without fee or cost. Parties who develop software incorporating predominantly NWS developed software must include notice as required by title 17, section 403 of the United States Code. NWS provides no warranty, expressed or implied, as to the correctness of the furnished software or the suitability for any purpose. NWS assumes no responsibility, whatsoever, for its use by other parties, about its quality, reliability, or any other characteristic. The NWS may change this software to meet its mission needs or discontinue its use without prior notice. The NWS cannot assist non-NWS users and is not obligated to fix reported problems; however, the NWS will make an attempt to fix reported problems where possible.