Bureau of Meteorology (BOM) Mesonet Data Darwin
Information updated on Wed Apr 5 15:55:51 2006
General Data Description
Surface meteorology data from Darwin in 1 minute and 10 minutes averages.Data Stream Names
twpmesodarX1.00 tar fileSample one minute averaged data followed by sample 10 minute averaged data can be found at the XDC web site for headers of data files
A sample report on the daily mesonet data can be found at the XDC web site for headers of data files
Measurement Description
- wind speed (m/s) and direction (degrees)
- air temperature (C)
- dew point temperature (C)
- wet bulb temperature (C)
- relative humidity (percent)
- rainfall (mm)
Temporal Coverage
Data begin 10/01/1996Area Covered
Data are from the Darwin AirportData Stream Inputs
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www.bom.gov.auContacts
ARM Mentor
Jim MatherARM Software Developer
Alice CialellaData Source
Institution
Australian Bureau of MeteorologyProcessing History
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Reprocessing Date
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Note these data are AWS (automatic weather station) data from the Darwin airport.Information on the 1 minute averages file:
Time is GMT
WS is wind speed. The units are knots. The first value is the one minute average followed by the (one minute minimum/one minute maximum).
WD is wind direction. Units are degrees. First is the average direction followed by (average minus one standard deviation/average plus one standard deviation).
AT is air temperature in degrees C. The values are average (minimum/maximum).
DP is dew point in degrees C. The values are average (minimum/maximum).
WB is web bulb temperature in degrees C. The values are average (minimum/maximum).
RH is relative humidity in percent. The values are average (minimum/maximum).
RF is rainfall. The unit is millimeters of rain. The value is the cumulative amount since the counter was last reset.
QFE, QNH, and QFF are all pressures in hPa. QFE is the instantaneous station level pressure. Note that an instantaneous value is the most recent one-second sample, not a one-minute average.
PRESSURE SETTING DEFINITIONS
o QFE: The pressure corrected to the official airfield elevation. An altimeter set to the particular airfield QFE reads zero when an aircraft is on the ground (strictly the height of the altimeter above the ground). In the circuit, the height indicated is the height above official airfield datum.
o QNH: The pressure 'reduced' to mean sea level, assuming ISA temperature profile from the station/airfield to MSL. An altimeter set to the airfield QNH reads the elevation of the airfield when on the ground.
o QFF: Barometric pressure 'reduced' to mean sea level, assuming an isothermal atmosphere from the airfield/station to MSL, using current (screen) temperatures. The difference between QFF and QNH can be considerable when atmospheric conditions are significantly different from ISA: i.e. at 'hot and high' airfields.
Based on these definitions, QFE is the actual pressure measured at the station while QNH and QFF are corrected for elevation to mean sea level (MSL) using two different techniques.
The numbers following MSG are check sums and error totals for QC - no details available.
Information on the 10 minute averages file:
A sample from a 10-minute message looks like:
00:02:39YPDN 28/02/03 01:30 008 007 011 339 008 28.0 28.0 28.1 25.5 25.4 25.6
1003.3 1007.5 1007.2 000.0 13.3 30.9 10 4005 126 260 829
00:12:38YPDN 28/02/03 01:40 007 006 011 338 005 27.9 27.9 28.1 25.7 25.5 25.7 1003.2 1007.4 1007.1 000.0 13.3 30.9 10 4006 126 260 842
| 00:02:39 | Local time at Darwin, HH:MM:SS |
| YPDN | Identifier for the Darwin airport |
| 28/2/03 | Date, DD/MM/YY |
| 01:30 | * Not sure - time of some sort |
| 008 007 011 | Wind speed (knots) mean, min, max |
| 339 008 | Wind direction mean, standard deviation |
| 28.0 28.0 28.1 | Air temperature (C) mean, min, max |
| 25.5 25.4 25.6 | Dew point (C) mean, min, max ? |
| 1003.3 1007.5 1007.2 | Surface pressure (hPa) QFE, QNH, QFF (defined above) |
| 000.0 | Rainfall in past ten minutes (units?) |
| 13.3 | Battery Voltage |
| 30.9 | Internal temperature of housing (C) |
| 10 4005 126 260 829 | * Again not sure. quality control information no details |
Example Data
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