> Home > HadISD > 3.2.0.2021f > Online Material >

HadISD online material - preliminary version 3.2.0.2021f

Please read the Geoscientific Instrumentation, Methods & Data Systems and Climate of the Past I and II papers before using the material presented here.

The netCDF headers are listed below with some information as to what they contain.

Field Name	Long Name	Units

time	Time	Hours since 1-1-1931 00:00UT
input_station_id	Primary source for timestep data
temperatures		C
dewpoints		C
total_cloud_cover		oktas
low_cloud_cover		oktas
mid_cloud_cover		oktas
high_cloud_cover		oktas
cloud_base		m
windspeeds		m/s
winddirs		degree
wind gust		m/s
slp	sea-level pressure	hPa
stnlp	station-level pressure	hPa
past_sigwx1	Past significant weather code
precip1_depth	Depth of 1-hour precipitation accumulation	mm
precip2_depth	Depth of 2-hour precipitation accumulation	mm
precip3_depth	Depth of 3-hour precipitation accumulation	mm
precip6_depth	Depth of 6-hour precipitation accumulation	mm
precip9_depth	Depth of 9-hour precipitation accumulation	mm
precip12_depth	Depth of 12-hour precipitation accumulation	mm
precip15_depth	Depth of 15-hour precipitation accumulation	mm
precip18_depth	Depth of 18-hour precipitation accumulation	mm
precip24_depth	Depth of 24-hour precipitation accumulation	mm
qc_flags	Quality control flags
flagged_values	Removed values (T, D, SLP, STNLP, WS, WD, TC, LC, MC, PP1, PP2, PP3, PP6, PP9, PP12, PP15, PP18, PP24)

The homogeneity information for this version is available here - the list of breaks and also some of the graphical outputs. The columns of the datafiles give the Station ID, the date of the change point, and two break magnitudes (one in the case of SLP). The first is from the monthly mean value, and the second is from the monthly mean diurnal range (temperature & dewpoint temperatures) or monthly mean daily maximum (wind speed). Missing values are denoted by -99.99. Please get in touch if there are any queries.

The inhomogeneity information has been calculated presuming the most recent period of a station is accurate and hence tranversing the timeseriers backwards in time. Therefore a negative in homogeneity value given indicates that prior to the month given, the data is at a lower value (so the adjustment required would be positive). Conversely, a positive vaue indicates that prior to the month given the data is at a higher value (a negative adjustment required).

Description	Data file	Notes
Logs
Merged temperature inhomogeneities	MergedBreaks_temperatures.dat
Merged dewpoint inhomogeneities	MergedBreaks_dewpoints.dat
Merged SLP inhomogeneities	MergedBreaks_slp.dat
Merged windspeeds inhomogeneities	MergedBreaks_windspeeds.dat

And figures from the homogeneity assessment

Type	Temperature	Dewpoints	SLP	Windspeeds
Distribution - average	PHA_temperatures_average_distribution.png	PHA_dewpoints_average_distribution.png	PHA_slp_average_distribution.png	PHA_windspeeds_average_distribution.png
Distribution - DTR	PHA_temperatures_dtr_distribution.png	PHA_dewpoints_dtr_distribution.png	-	-
Distribution - max	-	-	-	PHA_windspeeds_max_distribution.png
Map - average - inhomogeneity size	break_size_map_temperatures_average.png	break_size_map_dewpoints_average.png	break_size_map_slp_average.png	break_size_map_windspeeds_average.png
Map - dtr - inhomogeneity size	break_size_map_temperatures_dtr.png	break_size_map_dewpoints_dtr.png	-	-
Map - max - inhomogeneity size	-	-	-	break_size_map_windspeeds_max.png
Map - inhomogeneity number	break_number_map_temperatures.png	break_number_map_dewpoints.png	break_number_map_slp.png	break_number_map_windspeeds.png
Map - no inhomogeneities	zero_breaks_map_temperatures.png	zero_breaks_map_dewpoints.png	zero_breaks_map_slp.png	zero_breaks_map_windspeeds.png

A number of files and plots are linked below which were used or generated when creating HadISD.

Description	Station Number	Data file	Notes
Station Lists
HadISD Station List	9278	hadisd_station_info_v320_2021f.txt	1
HadISD Station List (with names)	9278	hadisd_station_fullinfo_v312_202101p.txt	1
HadISD Station Additions	805	hadisd_station_additions_v312_202101p.txt
HadISD Station Removals	13	hadisd_station_removals_v312_202101p.txt
Composite Stations	2713	final_mergers.txt	2
User Identified erroneous data

Failure Rate Summaries
Number of stations with a failures from a certain test in percentage bins		all_fails_summary_20220106.dat	3
Test 3-letter code descriptor		tests_codes.txt

Test	Variable	PNG
Failure Rate Plots
Duplicate months	All	png
Odd Cluster	Temperatures	png
Odd Cluster	Dew Points	png
Odd Cluster	SLP	png
Odd Cluster	Wind Speed	png
Frequent Value Check	Temperature	png
Frequent Values	Dew point	png
Frequent Values	SLP	png
Diurnal Cycle Check	All	png
Gap Check	Temperature	png
Gap Check	Dew point	png
Gap Check	SLP	png
Record Check	Temperature	png
Record Check	Dew point	png
Record Check	SLP	png
Record Check	Wind speed	png
Day Strings	Temperature	png
Day Strings	Dew point	png
Day Strings	SLP	png
Day Strings	Wind speed	png
Straight Strings	Temperature	png
Straight Strings	Dew point	png
Straight Strings	SLP	png
Straight Strings	Wind speed	png
Hour Strings	Temperature	png
Hour Strings	Dew point	png
Hour Strings	SLP	png
Hour Strings	Wind speed	png
All temperature strings	Temperature	png
All dewpoint strings	Dew point	png
All SLP strings	SLP	png
All wind strings	Wind speed	png
Climatological Check	Temperature	png
Climatological Check	Dew point	png
Climatological Check	SLP	png
Spike Check	Temperature	png
Spike Check	Dew point	png
Spike Check	SLP	png
Spike Check	Wind speed	png
Supersaturation	Dew point	png
Dew point depression	Dew point	png
Dew point Cut Off	Dew point	png
Variance Check	Temperature	png
Variance Check	Dew point	png
Variance Checks	SLP	png
Variance Checks	Wind speed	png
Logical Check	Wind speed	png
Wind Rose	Wind speed	png
Cloud Total	Low,Mid,High,Total	png
Unobservable	High Cloud	png
Unobservable	Low Cloud	png
Unobservable	Mid Cloud	png
Unobservable	Total Cloud	png
Full Low cloud check	Mid & High Cloud	png
Full Mid cloud check	High Cloud	png
Negative cloud value	All Cloud	png
Precipitation	Precipitation	png
Pressure Cross Check	Station Level Pressure	png
Neighbour Outlier	Temperature	png
Neighbour Outlier	Dew point	png
Neighbour Outlier	SLP	png
Month cleared	Temperature	png
Month cleared	Dew point	png
Month cleared	SLP	png
Month Cleared	Wind Speed	png
Month cleared	Wind Direction	png
Month cleared	Total cloud	png
Month cleared	High Cloud	png
Month cleared	Mid Cloud	png
Month cleared	Low Cloud	png
Month cleared	Cloud Base	png
All	Temperature	png
All	Dew point	png
All	SLP	png
All	Cloud	png

Notes

[1] Station ID, latitude, longitude and elevation used.
[2] First ID in the line is the station ID used throughout the processing. The remainder are ones which were composited into this station record.
[3] Summary table in the paper was created from this file. And you will need the test_codes.txt file to interpret these outputs. The first 71 rows are in the same order as the QC flag field in the netCDF files. The remaining rows are aggregations for all strings and all tests for the variables.