Meter Data for Weather

R %85($8 2) 0(7(252/2*<

NSW Climate & Consultancy Section

Fax: (02) 9296-1567 Ph: (02) 9296-1555 E-mail: reqnsw@bom.gov.au

Information for users of NSW AWS and METAR Data

Automatic Weather Station (AWS) and Meteorological Aerodrome Report (METAR) data is available in the following format:

CODE

STATION LSD EST UTC WINDDIR WINDSPD MAXWIND TEMP DEWP RHUM QNH RAIN

Description

4 letter code representing the station name Local Daylight Saving Time Eastern Standard Time (Non-daylight saving time) Universal Time Coordinate Wind direction:- averaged 3 second running mean during the preceding 10 minutes before the observation Wind speed:- averaged 3 second running mean during the preceding 10 minutes before the observation Maximum wind gust:- the maximum 3 second running mean during the preceding 10 minutes before the observation Dry bulb temperature - instantaneous reading at time of observation Dew point temperature - instantaneous reading at time of observation Relative humidity (calculated from TEMP and DEWP) Mean Sea Level Pressure Cumulative rainfall since 9am

Units

Degrees from true north Knots Knots Degrees Celsius (°C) Degrees Celsius (°C) Percent (%) Hectopascals (hPa) Millimetres (mm)

Definitions: Wet-bulb temperature: is measured using a standard mercury-in-glass thermometer, with the thermometer bulb wrapped in muslin, which is kept wet. Wet-Bulb Temperature is therefore usually lower than the dry-bulb. Dry Bulb temperature: representative temperature of the surrounding air measured by an uncovered thermometer. Dew-point temperature: the temperature to which the air needs to be cooled for condensation to occur. It is therefore an indicator of the moisture content of air. The closer the dew point temperature is to the air temperature the higher the relative humidity. The Dew-point temperature is derived from the wet bulb depression, the difference between dry-bulb and wet-bulb temperatures. Conversion from knots to km/h or m/s: 1 knot =...