Tuesday, February 10, 2015

ACTON update

BOM have finally put up the daily min records for the ACTON weather station. This provides another case where the records need to be adjusted. In its Special Climate Statement 48 BOM asserted on page 4...
"On the 17th, Canberra (39.7°C/11.2°C) had its largest diurnal range on record, 28.5°C"

Looking  over the records for the Canberra heatwave in January 1939 we find the exact same diurnal range was recorded at the ACTON station on January 13 1939 when this first class weather station recorded a max of 41.9 and a min of 13.4.

BOM continue to disregard history!

The BOM's ACTON weather station in 1921-according to BOM it may as well not exist!

12/2/2015...Reply from BOM after we pointed out their error...(seems like they have been infected by ABC disease)

Dear Marc,

The Special Climate Statements are prepared to describe major climate events close to the time that they occur.

For this reason, the reports indicate that the data are valid at the time of writing, and each report provides the date that the final data were sourced.

This provision is necessary since the data may change subsequently for a number of reasons, such as late-arriving manual observations, or subsequent quality control and analysis that may revise the data.

Special Climate Statement 48 was prepared on the 19th January 2014, and carries the following advice.

"This statement is based on data available as of 19 January 2014. Some changes may occur as a result of late-arriving data or the Bureau’s routine quality control procedures.”

Rainfall records in particular are commonly subject to such revisions, and the Bureau does not typically amend previous reports unless a substantial update is required.

In this case, there has been no change to the data considered in the report at the time of writing. The record referenced in Special Climate Statement 48 is for Canberra Airport (station numbers 70014 and 70351). This is detailed in table 3 of the report.

While recently digitised data from Acton has not yet been quality controlled, the observations for January 1939 are consistent with surrounding locations, and show that the 1939 heatwave was one of the most significant on record for the southeast. This information is already provided in the report.

"Over most parts of this region, it ranked alongside the heatwaves of January-February 2009, January 1939 and (from the limited information available) January 1908 as the most significant multi-day heatwaves on record.”

Climate Analysis Section

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