The Wacky World of Weather Stations: No. 283- Cape Bruny (Tas)

Thursday 05/12/2019

Please refer back to my first post for site specifications and to No. 92- Logan City for 2018 specifications.  If you wish to check on this (or any) site for yourself, go to my post on how to check for yourself.

Station: Cape Bruny Lighthouse 94010

Opened: 1871

Daily Temperature data from: 1923

Data used to adjust Acorn sites at: Butlers Gorge (1949, 1952, 1956, 1959), Grove, Hobart, Wilsons Promontory (1951).

Location:   Co-ordinates  -43.4892 147.1453

70km south of Hobart

BOM site plan 2018:

Google satellite image 2019:

Two for the price of one! There are two stations 50 metres apart. The lighthouse screen is between two houses 12 and 14 metres away with paling fences 10 metres away, and with a concrete slab, previously a double carport, 13 metres away. It is very poorly exposed.

This is another Acorn station that is non-compliant, with temperatures reported at Latest Weather Observations and used to adjust data at other Acorn sites.

FAIL

Percentage of all Australian sites not compliant: 39.09%.

Tags: , , , , ,

5 Responses to “The Wacky World of Weather Stations: No. 283- Cape Bruny (Tas)”

  1. billinoz Says:

    1 : Ken this site is interesting. The BOM stations are at the cape on the Southern end of Bruny Island. And being an island the climate is especially affected by the surrounding seas.

    2 : This is a light house site and as I noted before, the site is elevated above the sea with cliffs around it on three sides. ( I can see the cliffs in the Google Earth photo ) So the heavy cold air will fall away from both of these BOM weather stations. This means that they are not accurately measuring the minimum temperatures on any day.

    3: The BOM screen in the midst of the human effected area is sheltered by buildings on two sides. And there is a car park ( note the truck ! ) on a third side.

    4 : The second temperature screen is well away from the buildings. However it is also perched high on the Cape where cold heavy air always falls away downhill.

    It is also surrounded by scrubby bushes in the Google earth photo.I cannot say how high they are growing but Australian native bushes can easily grow to 1.5 meters even in exposed and windy sites like this. So it is probably being sheltered by this scrub as well.

    That will also lead to higher temperatures being recorded than are actually normal.
    PS : I wonder if anyone has a local ground level photo of the BOM weather screen ?.

    • kenskingdom Says:

      The site plan for the AWS show the vegetation height pretty well: heath about 0.5m, scrub to 1.5m, and some shrubs near the road at 3m. Google street view has photos but don’t add much value. Being on an exposed headland in the roaring forties calm still nights when cold air can settle would be rather rare.

      • billinoz Says:

        Ken it’s true that in the “Roaring 40’ies” calm days & nights without winds are less than elsewhere further to the North. But they do happen as any sailer from this part of Tasmania can tell you.

  2. The Wacky World of Weather Stations by State | kenskingdom Says:

    […] Cape Bruny (Tas) […]

  3. Australia's Wacky Weather Stations: Final Summary | kenskingdom Says:

    […] Cape Bruny […]

Comments are closed.


%d bloggers like this: