An email from Perth pointed out the plentiful mild weather lately. I see that Perth Airport 9021 is used in ACORN so I have had a look-see at all the raw monthly max data from CDO – (December data up to 16th so far). 
The first thing that hits me is a step-change coincident with the June 1994 install of a temperature probe (AWS). For larger version chart. Yet the BoM ACORN version for 9021 has no adjustment at 1994. The other point I would make is that UHI would have been steadily affecting this site as Perth housing & suburbia expanded producing warmer breezes. I can look at ACORN data later.
Here is a chart of raw monthly min data from CDO. Less noisy than the max. 
For larger version chart.
Here is a chart of annual mean T plus annual Range (mean T is the metric for “IPCC Global Warming/Climate Change”) 
For larger version chart.
Monthly Archives: December 2021
Last week 1,200GL NSW rivers flowed to Tasman Sea
Water NSW publish a spreadsheet of 7 days NSW river heights and flows(my extract spreadsheet).
I calc the 7 days flows to 14 Dec at ~1,200 GL or approx 2 Sydney Harbours and several rivers around Sydney were left off the Water NSW list. I am trying to get the data for November monthly outflows to the Tasman Sea.
80th Ann. Pearl Harbor attack
In 2019 I blogged – US & Japan war-gamed Pearl Harbor attack in 1930’s – and with the 80th anniversary near I had hoped to sketch over the main warnings during 1941.
The McCollum Memo October 1940 by Lieutenant Commander Arthur McCollum in the Office of Naval Intelligence which IMHO was written quickly is a fair summing of WWII at that time by a well informed officer sketching out the global security problems facing America.
This is the most comprehensive list of “all of 1941 warnings” I have found online.
Additional to the above list and while not strictly a warning but for sure a closely related event in the saga.
Two years ago I blogged “Did Admiral Kimmel exercise his fleet north of Oahu 21st to 24th Nov 1941 ?” and discovered thru Google that the answer was yes he did and was ordered back to Pearl by Washington. I will add more 1941 warnings missed from the above link as they come to mind.
For example on the day of the attack – Early am on the 7th the Destroyer Ward fired on a submarine conning tower near the entrance channel to Pearl and radioed in a report but the office brass just talked about it and asked for confirmation. Well the confirmation did arrive.
There was also the cogent warning about incoming aircraft from the radar station on northern tip of Oahu but that managed to be ignored too. What was so hard about scrambling some aircraft. Also early that morning the Japanese sub I-26 sunk the freighter SS Cynthia Olson en route from Tacoma, Washington, to Honolulu. A radio message was broadcast and picked up by the Matson Liner Lurline heading for San Fran from Honolulu – could have helped weave the tapestry of warnings but who wanted to be warned. I will add more as they come to hand.
November BoM Temperature Outlooks failures
BoM Outlook predictions for November max and min temperatures made on 28th October failed in may areas but the minimum Outlook was worst.
Max (day-time) Outlook — Max anomaly map actual result
Min (night-time) Outlook — Min anomaly map actual result