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NOTE: The file format described below refers to the Met Office Land Surface data (1900-2000) dataset which has been superseded by the Met Office MIDAS dataset (1853-present) at the BADC.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 .dwx files is available (.dwx stations).
The file name convention is (STATION_NAME)(YEAR).(MESSAGE_TYPE).(FILE_EXTENSION)
These .dwx files contain daily weather observations measured
on a 24 hour time scale. The file headers END_HOUR
and COUNT define the observation period.
Sunshine duration, snow day, hail day, thunder day and gale day are usually for the period 0000-2359Z (i.e. END_HOUR=2359 and COUNT=24). Concrete state, lying snow, snow depth, fresh snow depth and fresh mountain snowfall are "spot" values, usually at 0900Z, i.e. END_HOUR=0900 and COUNT=0.
-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 .dwx data files are :
|ID||Station Ref. Number||1||1-8||-||Station identification|
|MET_DOM||Met. 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||-||Observation end time|
|COUNT||Hour count||8||62-69||-||See COUNT definition|
|SUN||Sunshine duration||9||70-77||0.1 hour||See Met Office documentation|
|CONC||State of concrete slab||10||78-83||WMO Code||State of a concrete slab (e.g. dry, wet, frozen, etc) of specified standard dimensions and composition at the observing station.|
|SNOW_L||Snow lying||11||84-91||WMO code||Snow lying is counted, provided that the snow covers at least one-half of the ground easily visible from the station and the altitude of this ground does not differ by more than 30m from that of the station. In judging if at least one-half of the ground is snow covered no account is taken of bare patches under trees or of aeras occupied by water.|
|FRSH_SNOW||Fresh snow amount||13||100-110||cm||-|
|SNOW_DAY||Day of snow||14||111-120||WMO Code||-|
|HAIL_DAY||Day of hail||15||121-130||WMO Code||A day of hail is defined as one when pieces of ice, 5mm or more in diameter are observed to fall. The hailstones can fall separately or be agglomerated into irregular lumps.|
|THUN_DAY||Day of thunder||16||131-139||WMO Code||A day of thunder is counted when thunder is heard.|
|GALE_DAY||Day of gale||17||140-149||WMO code||A day of gale is counted when a mean wind speed reaches or exceeds or is estimated to have reached or exceeded, 34kn (force 8 on the Beaufort scale) over a period of at least several minutes (10 mn in the case of a station equipped with an anemograph).|