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VERSUS at DWD - 2011

This article discusses the state of work with VERSUS at DWD, including regular work, data submission, graphics and text file production, weather-type dependent verification, and work on special cases. It also highlights severe problems faced with VERSUS and the need to overcome them for the system to be operational.

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VERSUS at DWD - 2011

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  1. VERSUS at DWD - 2011 Ulrich Damrath & Ulrich Pflüger COSMO GM Rome, September 2011

  2. State of work with VERSUS @ DWD • Regular work with VERSUS • Submission of data for the common plots was done • Graphics and text files were produced for a lot of cases • Weather-type dependent verification in VERSUS was introduced • Work was done for some special cases • Work was not done in a quasi operational mode • Conditional verification and stress test • No quasi operational use of conditional verification • Stress test was not performed • WHY?

  3. Severe problems with VERSUS @ DWD - 1 • Access to mysql-database • Execution is sometimes very slow – probably because of the large size of the file ibdata1 in the mysql-directory (currently: 0.9 TByte). • Filotea gave some hints to overcome these problem, but the execution of the recommended data base requests need some time … • There was no disk space to introduce the stress-test data. • Access may be disturbed during an active loader phase. • Large time to wait for a response or • Interrupt of score calculation • php-problems • At browser sessions that are not direcly carried out at the versus server php dies after about one hour • At browser sessions that are directly carried out at the versus server this problem does not occur. • Software problems: • Decoding of bufr data did not work correctly for observations at 06 UTC (starting in March 2011) • Filotea gave the advice to install bufr_dc version 3.83. And it worked! • Some input data had to be recalculated. • More …

  4. Severe problems with VERSUS @ DWD - 2 • The running state of the loader cannot be controlled!!! • Loader cannot be stopped via the browser menu! • Processes appear to be stopped – but they are running! • Pressing the <Start>-button leads to a new loader process that has to be killed manually – if it can be catched • If the loader is really active with GRIBs the process is active for some seconds and can be killed. • If the loader is waiting for new files it generates a new process every second or so. This process is not easy to kill. • More …

  5. Severe problems with VERSUS @ DWD - 3 More …

  6. Severe problems with VERSUS @ DWD - 4 Nevertheless …

  7. Some typical examples: CEU T 2m forecasts July 1010

  8. Some typical examples: CDE T 2m forecasts July 1010

  9. Some typical examples: CEU TDEW 2m forecasts July 1010

  10. Some typical examples: CDE TDEW 2m forecasts July 1010 And lots of others …

  11. Current state • VERSUS is on the way to be operational at DWD • Operational suite has to be defined for • Standard verification • Conditional verification • Model intercomparison … • This can be done if the current problems are solved. • Open question: What will happen if the feedback files from assimilation will be introduced into VERSUS?

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