PLEASE NOTE: The file format described below refers to the Met Office Land Surface data (1900-2000) dataset which has been superseded by the Met Office MIDAS dataset (1853-present) at the BADC.
A list of UK stations for which the BADC holds .drain files is available (.drain stations).
The surface data file name convention is (STATION_NAME)(YEAR).(MESSAGE_TYPE).(FILE_EXTENSION)
These .drain files contain rainfall amounts measured during
one or more 24 hour period. The file headers END_HOUR
and DAY_CNT define the observation period.
For daily rainfall, i.e. rainfall over a 24 hour period, usually 09-09, DAY_CNT=1. The 24 hour period ends on the stated date and time. For daily rainfall from irregular sources, i.e. those which report monthly or weekly, DAY_CNT is then the number of days over which the rainfall is measured. Again the period ends on the stated day.
-999 indicates a missing value.
The first line of the data file are the fields headers (which are detailed in the table below).
The fields in the .drain data files are :
|ID||Raingauge Number||1||1-8||-||Rainfall observation site identification|
|IDTYPE||-||2||9-17||-||Rainfall observation site identification|
|MET_DOM||Meteorological Domain||3||18-28||-||Message types|
|MONTH||Month||5||36-43||-||1 or 2 characters (from 1 to 12)|
|DAY||Day||6||44-51||-||1 or 2 characters (from 1 to 31max)|
|END_HOUR||Hour||7||52-61||-||Hour of observation from 0 to 2300|
|DAY_CNT||Observation period||8||62-70||hours||See COUNT definition|
|AMT||Precipitation Amount||9||71-78||0.1 mm||See Met Office documentation|