AT THE POINT
Point information & photos: Col Grant. Near midday, Sept 2008. Authors email: firstname.lastname@example.org
IN THE DEGREE SQUARE
Observations carried out at exact degree confluence. Site is a t a gibber field in far western Qld, close to the divide between the Bulloo River and Cooper Creek.
Climate: The closest representative weather station is at the Tibooburra Post Office, which is 185 km south-west of the confluence, and has an elevation of 183 m.
The highest temperature recorded was 47.6°C in January 1973, and the lowest was -2.5°C in June 1982. The greatest rainfall recorded in a year was 755.4 mm in 1974, and the lowest was 47.9 mm in 1919. These and other climate statistics for Tibooburra can be found at: Australian Bureau of Meteorology, http://www.bom.gov.au/climate/averages/tables/cw_046037_All.shtml
Extremes of Nature: Despite its inland location, since 1906 there has still been one cyclone to pass within 50 km of the degree confluence (David, 1976), and a further two have passed within 200 km (1956, 1964). Cyclone information for this area and all of Australia can be found at the Australian Bureau of Meteorology website, http://www.bom.gov.au/cgi-bin/silo/cyclones.cgi.
Cyclone tracks within 200 km of the confluence, 1906 to 2006 (Bureau of Meteorology web site)
The area can experience extreme heat throughout some of the year, with Tibooburra having an average of 74 days annually with maximum temperatures equal to or over 35°C. With a low annual rainfall and only 32 days on average a year, the area is also among the driest in Australia.
The total population of the degree square at the 2011 national census was 197, though this population is actually spread across 10 degree squares in a SA1 that is 73,760 sq km in area. Some of the apparent increase may be associated with the development of gas fields in the area.
The Grey Range
Edited by: Hayley Freemantle
More to come.