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TIGGE Data Archive and Access at NCAR

This project aims to accelerate improvements in high-impact weather forecasts by enhancing international collaboration on ensemble prediction and combining ensembles from different sources. The TIGGE Data Archive provides global ensemble forecasts on various pressure and theta levels, allowing users to access, download, and analyze the data.

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TIGGE Data Archive and Access at NCAR

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  1. TIGGE Data Archive and Access at NCAR November 2008 Steven Worley National Center for Atmospheric Research Boulder, Colorado, U.S.A.

  2. Topic Outline • Project Definition • Archive Summary • Data Description • Provider Summary • NCAR’s portal and access

  3. Project Outline TIGGE, the THe Observing System Research and Predictability EXperiment (THORPEX) Interactive Grand Global Ensemble • WMO World Weather Research Programme • Goal, accelerate improvements in 1-day to 14-day high-impact weather forecasts • How • Enhanced international collaboration on ensemble prediction • New methods for combining ensembles from different sources • Deeper understanding of forecast errors • Purpose • Prototype for a future Global Interactive Forecast System (GIFS)

  4. Phase I Archive Centers Archive Centers • NCAR • ECMWF • China Meteorological Administration (CMA) Archive Centers build identical archives, i.e. all the data.

  5. TIGGE Archive Centers and Data Providers UKMO CMC CMA ECMWF MeteoFrance NCAR NCEP JMA KMA IDD/LDM HTTP FTP Archive Centre CPTEC Current Data Provider BoM IDD/LDM Internet Data Distribution / Local Data Manager Commodity internet application to send and receive data

  6. Brief Data Description • Global Ensemble Forecasts • Five parameters on eight pressure levels • Z, Q, T, U, V • 1000, 925, 850, 700, 500, 300, 250, 200 hPa • Z at 50 hPa • Potential Vorticity on 320 K Potential Temperature Surface (θ) • θ, U, V on  2 potential vorticity surface • 28 Surface/Single level parameters

  7. Summary of Data Providers, March ‘08

  8. TIGGE Archive Completeness, 02/2008 PL = Pressure Level, PT = 320K Theta Level, SL = Single/Surface Level

  9. TIGGE Archive Completeness, 02/2008 PL = Pressure Level, PT = 320K Theta Level, SL = Single/Surface Level

  10. The Data Management Challenges Anomalies between centers • Native horizontal resolution • Number of ensemble members • Number of forecast initialization times (1, 2, 4x daily) • Forecast increment time period • Forecast length • Number of fields provided • Internal file compression (e.g. jpg) was not specified Influence on Research • User interface must inform users - commonalities constrain research

  11. NCAR TIGGE Portal Address: http://tigge.ucar.edu Main Features • Registration and Login • Get Data • User Tools • Documentation and Linkages • Technical and Community Supported Help

  12. Dates Center File Type Forecast Time Forecast Duration

  13. Get Forecast Data Two User Interfaces • NCAR online file archive • Selection options • Center(s) • Date • File type (sl, pl, etc) • Initialization time • Forecast length • User customized files • Selection options • Same as for files, plus • Parameter • Regridding • Spatial subsets • Formats, GRIB2, netCDF Real Time Delayed Mode • Download Options • Point and click using browser, one file at a time • Script to run on local machine • User and password encrypted ‘wget’ commands • background process to access all files

  14. Tropical Cyclone Track Data • Direct Download Only, <CXML> format • Simple directory system, center/year/month • Web address, dss.ucar.edu/datasets/ds330.3 • Update Frequency • 12 hours • Size • 6GB

  15. Public Announcement • EOS, Transactions, American Geophysical Union, Vol. 89, Number 36, September 2, 2008 • Title: Improving High-Impact Weather Forecasts • Included an online supplement

  16. END Steven Worley worley@ucar.edu

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