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The maps linked in this page are produced with a statistics of the last 7 days of data acquired at ECMWF by the SAPP (Scalable Acquisition and Pre-Processing) system. The aim is to provide a detailed picture of the observations data coverage and issues in terms of data format to give a view from the NWP perspective of the status of the TAC to BUFR migration.

All the maps are interactive and extra information on the specific station is shown by hovering on the markers.




SYNOP Coverage



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TAC only

BUFR only 

Dual: BUFR and TAC 






TEMP Coverage 

TEMP Descent Coverage 



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TAC only

BUFR only, high resolution and drift

BUFR only, low resolution and drift

BUFR only,  no drift (reformatted TAC)

Dual: BUFR and TAC, high resolution and drift

Dual: BUFR and TAC, low resolution and drift

Dual: BUFR and TAC, no drift (reformatted TAC)






SYNOP Issues

TEMP Issues



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BUFR/TAC positions different ( > 0.1 degree)

WMO id not in Vol A Catalogue

Silent,  no report received in the last 7 days (but at least once in the last year)

BUFR observations/day < 60% TAC observations/day






SYNOP BUFR Frequency

SYNOP TAC Frequency


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24  observations/day

8 to 23 observations/day  

4 to 7  observations/day  

2 to 3  observations/day  

1 to 2  observations/day  

less than 1 observation/day






TEMP BUFR Frequency

TEMP TAC Frequency


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>=4 observations/day

2 to 3 observations/day

1 observation/day

less than 1 observation/day






SYNOP BUFR Timeliness

SYNOP TAC Timeliness


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0 to 10 minutes delay

11 to 20 minutes delay

21 to 30 minutes delay

31 to 60 minutes delay

> 61 minutes delay






TEMP BUFR Timeliness

TEMP TAC Timeliness


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0 to 30 minutes delay

31 to 60 minutes delay

61 to 90 minutes delay

91 to 120 minutes delay

> 121 minutes delay