Enhanced tropical cyclone trajectory forecast products

See also: Key characteristics of our current forecasting system

Implementation date

1 December 2013

See Newsletter No.130.

Horizontal (unchanged)

  • Atmospheric
    • HRES: T1279
    • ENS: Leg A T639, Leg B T319, Leg C T255
  • Wave
    • HRES: 0.25 degrees
    • ENS: 0.5 degrees

Vertical (unchanged)

  • Atmospheric
    • HRES: L137
    • ENS: L91
Data set affected
  • TC track

ECMWF's TC track products contain

  • time
  • position (latitude/longitude in degrees)
  • central pressure (hPa) 
  • location and intensity of maximum wind speed (m/s) for each tropical cyclone identified and tracked in the forecast.

ECMWF's TC track are produced only for tropical cyclones where an observation report is present at the analysis time.

Meteorological changes  
Meteorological impacts  
Technical changes
  • The enhanced TC tracks are coded in BUFR-4 and replace the current BUFR-3 products
    • BUFR Section 1 changes:
      • edition number changes from 3 to 4;
      • length of section 1 changes from 18 bytes to 22 bytes.
    • Some steps are coded as missing values in the new product.
    • BUFR tables version 16 (files B0000000000000016000.TXT,D0000000000000016000.TXT and C0000000000000016000.TXT). are needed to successfully decode the new TC track products. Users that do not have these tables download the latest version of ECMWF's BUFRDC
  • The BUFR templates remain unchanged but missing value indicators are used to describe unavailable data entries
  • For compatibility reasons, TC track products archived in MARS will continue to be encoded in BUFR-3 but will include all enhancements described above.
Graphical products  
Model ID
  • Atmospheric: 130
  • Ocean wave: 116
  • Limited-area ocean wave: 216
New disseminated model output -  
Discontinued disseminated model output -  
e-suite experiment number 0059