Forecast Accuracy
 

As I sit here I have hail, severe downbursts significantly reduced visibility in a storm that 1 hour ago the TAF had no indications of. 2 hours ago the AWS had SCT 061 when it was actually OVC A017 ( BTW I am an approved Aerodrome weather observer). My point is the main BOM site indicated all day that storms and weather were possible but not the TAF, no inter no nothing. The cells were literally 10nm SW before the TAF was amended, as a response not actually as a forecast.

In winter the BOM will put inter or Tempo for fog and reduced viz in a destination that is known for never having fog. In 30+ years 2 fogs, both from the sea in the middle of the day neither forecast. When MET were located at this aerodrome the worst it got was shallow fog on the flora surrounding the aerodrome never on the movement areas.

So in times of actual prudence there is none and in times of no danger its panic stations. Since Mildura its just become hopeless. Carry the fuel for a no chance event (historically) and have no real reserves when a cell is in the circling area. I think it is outrageous and cannot understand why they believe the AWS when they could just look at the ASA webcam for the aerodrome and take it onboard that their systems are dangerous and don't work.

Yup. Anybody flying around with min. fuel these days is a clown.

Serious question, do you think that this is due to the BOM getting worse at forecasting? (possibly due to an over reliance on computers)

Or is it due to more unpredictable weather?

Or something else?

I agree with you that min gas is a great way to get yourself into trouble.

Not talking about Mildura. But in that case unforecast weather caused a couple of issues for Virgin. The bigger issue is that there appears to be a huge gap between BOM guesses on their website and actual aviation forecasts. I've sent them photos in real time of their AWS saying viz 3000m in fog when its actually cavok. They don't give a sh...... and are unaccountable for their folly. Just look at their initial predicated tracks for Cyclone Oma. As it turned out it went the complete other way and this is assuming many computers were used, where in actual fact a chocolate wheel or a TRS80 could have done a better job.

I think most knw our WX reports are atrocious here in Oz, you get used to it & source other avenues to seek out the real WX. I never trust any WX produced by the BOM!
I guess that's why they are called 'forecasts' to save their butt!
Camera's are great for short term stuff, I often 'phone a friend' where I am going get a real assessment of the weather if it looks average!

The inquest found that the Bureau did issue a number of forecasts to the organisers of the race the Cruising Yacht Club in Sydney warning of severe storm conditions developing however their importance was not well understood/received by CYC and were not passed onto participants (20 years ago that would not be an easy thing to do), and as such the case against the Bureau was dropped. Some of it what happened is in this link https://www.abc.net.au/news/2018-12-...sting/10286796

Are Bureau public weather forecasters pilots or yachties? Probably not. I went to a talk by an ex CEO of the British Met Office who hated the use of the word "forecasters" which confined his meteorologists to be just a bunch of unseen boffins in a backroom running endless models and calculations in order to come up with a paragraph of text after which their responsibility ends. He wanted his meteorologists to be more relevant by having more engagement with industry rather than just producing a paragraph of text and calling it a day. Perhaps the Australian version can take a leaf out of his vision.

Of course more engagement will often generate better outcomes but can also expose you to more litigation when they don't.

No not Brisbane but your close..ish. I too have worked with BOM people in briefing and as go to people when questioning conditions for runway changes etc. It is not a personal dig, however when a metar or speci is inaccurate due to a dodgy or restricted AWS, because BOM shut manned regional stations, they need to be as accurate not less. Technology doesn't understand local conditions such as why we just don't ever get LVO due to fog. Last night had an aircraft diverted here based on the AWS/metar and the TAF they may have found themselves with limited fuel in a world of pain....sound familiar.

The reference to Mildura is, I assume, regarding the diversion from Adelaide due unforecast fog a few years ago. Why you would divert away from an airport with a functioning ILS has been the subject of debate ever since. Airlines require strict adherence to regs. ( of course) but still pressure crew to carry minimum fuel. Such is the dilemma confronting every Airline pilot on a daily basis.
Slezy9, does it mean that forecasting is better or worse than 30 years ago? I would venture that not too many forecasters look out the window any more. Nor do they use the basic d@g f%ck detector any more.
I am particularly amused by the joker who puts a CAVOK period in the middle of the day on the TAF in Darwin during the wet season. Funny guy... And theres many more.
And dont get me started on single runway requirements.
Solution?
Use the the judgement they pay you for and keep yourself safe.
Everybody behind you will be thankful for it.

To quote TwoFiftyBelowTen
BKN008 is classed as CAVOK for CHTR and Gun (Bank) Runners.

CC:O

At best the forecast is a guess by a scientist based on statistical data and old observations.

The Broome based met Observer was there for years and could predict with uncanny accuracy fog, regardless of the wet/dry figures the Perth based forecaster was using.

An old Mentor of mine(fog expert of Fitzroy fame) said "I am never worried what the forecast says, it is what it doesn't/cannot/will not admit to it being a guess at best.

In my days as an ATC Instructor in the late 1970s with CFS "C" Flight, the CO had a sign above his desk: BEWARE THE WEATHER GUESSERS FOR THE TRUTH IS NOT OFTEN WITH THEM.

Guess not much has changed.

MJG