We decided not to run an update last year (to what would have been v220.127.116.112f) as the maintainers of the ISD were doing some large updates to the raw files. It would only make sense to do the update once the ISD was stable, which would have meant our update being released towards the end of the year. However, we hope that this year we can stick to our planned update cycle.
The raw data were downloaded on 14th January 2014, and processed over the subsequent week. There have been changes to all of the raw files in 2010, 2011 and 2012 as part of the ISD update process mentioned above. We have made no substantial changes to the codes which do the conversion to NetCDF files or the Quality Control suite. Hence the version number has only incremented by 0.0.1 and the year.
This version still contains 6103 stations, with 4071 passing the final filtering checks, down slightly from the 4206 in v18.104.22.1682p (see the HadISD paper Section 6). The patterns of flagging are very similar to v22.214.171.1242p. However if you find something strange, do let us know using the contact details on the HadISD website. Please note the stations which are known to have issues, documented on this blog and on the website.
|Percentage of data removed by the QC tests for Temperature in HadISD v126.96.36.1993p|
|Percentage of data removed by the QC tests for Dewpoint Temperature in HadISD v188.8.131.523p|
|Percentage of data removed by the QC tests for SLP in HadISD v184.108.40.2063p. SLP is not reported at all time stamps, and so with shorter records the amount removed can appear higher.|
We hope do have time to do some more development work on HadISD during 2014 which will address these stations as well as other improvements we have in mind. So, if there are any requests, do get in touch.