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#1467083 - 08/07/2018 06:02 Giant High Pressure Systems
Eigerwand Offline
Weather Freak

Registered: 28/05/2012
Posts: 325
Soppose iíve been watching the weather now for about thirty years. In that time I donít think Iíve ever seen so many enormous high pressure systems as we have seen over the past 6-8 weeks, singularly big enough to span the entire country.
How unusual is this? Does anyone have any ideas as to why we are seeing such large systems occur?

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#1467089 - 08/07/2018 10:00 Re: Giant High Pressure Systems [Re: Eigerwand]
paulcirrus Offline
Weatherzone Addict

Registered: 08/08/2011
Posts: 1563
Loc: Brisbane - Windsor
Nothing unusual about it. Seen bigger events.
But will be more
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#1467108 - 08/07/2018 17:18 Re: Giant High Pressure Systems [Re: Eigerwand]
Petros Offline
Meteorological Motor Mouth

Registered: 30/12/2002
Posts: 7454
Loc: Maffra, Central Gippsland, Vi...
Pretty typical mid winter scenario by my experience Eiger.

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#1467110 - 08/07/2018 17:46 Re: Giant High Pressure Systems [Re: Eigerwand]
retired weather man Offline
Weatherzone Addict

Registered: 01/07/2007
Posts: 4781
Loc: Wynnum
Agree. 1972 was also a standout year, my "best" memory of a week long 1035+ high over Victoria was the massive smog in Melbourne which never really lifted. In driving back from Essendon Airport at 2 p.m. one day, the wipers left a green smudge on the windscreen. The following year at Laverton Apt in a similar set up the min temp one day was minus 1 and the max was plus 2C, in a freezing fog(smog) which lifted briefly over the city area giving a more respectable max of 9 deg there.

That was the era before the EPA really got going, and one of their first efforts was to ban the burning of autumn leaves in the gutters outside suburban houses. But the bricketts use was still extremely common then.


Edited by retired weather man (08/07/2018 17:49)
Edit Reason: addition.
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Wyn Nth 2018-Jan12.2(158),Feb264.4(146),Mar217.0(126),Apr65.8(96),May46.0(100),Jun39.8(74),Jul19.6(56.1),Aug 23.6(45),Sep33.2(32),Oct150.0(95)Nov0.0(109)YTD871.6(1037.4),

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#1467117 - 08/07/2018 20:04 Re: Giant High Pressure Systems [Re: Eigerwand]
scott12 Offline
Weatherzone Addict

Registered: 10/11/2015
Posts: 1046
Loc: maadi Tully area
Its just par for the course this time of year ..that's what brings the nasty SE tradewinds to the North of QLD..at least they are moving through now whereas a month or so back they were very slow moving, almost stationary...when they are moving along they often offer Nth Qld a few days of slack weather once they pass till the next one pushs through...this gives us a break from the incessant Sou'easters and gives keen fisho's a reason to live.. smile

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#1467119 - 08/07/2018 20:33 Re: Giant High Pressure Systems [Re: Eigerwand]
Thunderstruck Offline
Lightning man

Registered: 10/05/2001
Posts: 14965
Loc: Seaford Meadows, SA
2006 was a clear standout for mine with regards to large highs.

TS cool

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#1467128 - 09/07/2018 10:39 Re: Giant High Pressure Systems [Re: Eigerwand]
Ronfishes Offline
Weatherzone Addict

Registered: 25/02/2013
Posts: 3668
Loc: Gordonvale
I remember Peter Byrne, our old win tv forecaster, only getting excited about highs over like 1038-1040
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#1467184 - 11/07/2018 06:38 Re: Giant High Pressure Systems [Re: Eigerwand]
Eigerwand Offline
Weather Freak

Registered: 28/05/2012
Posts: 325
Thanks for the replies folks.

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#1467290 - 13/07/2018 18:03 Re: Giant High Pressure Systems [Re: Eigerwand]
Eigerwand Offline
Weather Freak

Registered: 28/05/2012
Posts: 325
So based on that little Weather Pulse vid put up today, sea surface temps around Aus, in particular NW WA are cooler than usual. I know that dominant high pressure systems are a feature of this time of year but I still think the last couple of months has seen larger more dominant pressure systems than usual. Cooler sea surface temps would make help to contribute to that being the case.

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#1467300 - 13/07/2018 22:29 Re: Giant High Pressure Systems [Re: Eigerwand]
ashestoashes Offline
Weather Freak

Registered: 22/10/2017
Posts: 460
Loc: Voyager Point (South West Sydn...
Can i get a goodbye to dominant high pressure systems with the 240hours hopefully staying with EC. Definitely one of our better years compared to the couple few in terms of SAM with no Winter negative since 2015, although the lack of rain has been persistent hence us feeling the pinch.

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#1467304 - 14/07/2018 04:26 Re: Giant High Pressure Systems [Re: Eigerwand]
Long Road Home Offline
Meteorological Motor Mouth

Registered: 08/10/2007
Posts: 8597
Loc: Northern Beaches Syd
Yep 2006 definitely a standout, I also remember GFS not updating a few times that autumn and winter (ironically enough) it wouldn't have made a difference anyway because the highs didn't budge and our forecast was "Fine and sunny" for weeks on end. We all seriously wondered if it would ever rain again laugh

Mid 2003 was monotonous too, however nothing like 2006.

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#1467325 - 14/07/2018 11:43 Re: Giant High Pressure Systems [Re: Eigerwand]
Eigerwand Offline
Weather Freak

Registered: 28/05/2012
Posts: 325
Some good cold mornings out of them at least, but yeah, bring on more frontal activity.

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#1467381 - 15/07/2018 12:34 Re: Giant High Pressure Systems [Re: Eigerwand]
Eigerwand Offline
Weather Freak

Registered: 28/05/2012
Posts: 325
Thought Iíd noticed some colder than usual and consistently cold minimums over the centre of the continent, a check of the obs confirmed this, Alice Springs is currently a whopping 4.4C below the long term avg for July minima!!! This comes off the back of June that was 2.4C below avg for minimums. So good to see some significant cold stats.

I knew the past couple of months synoptic charts looked different and the evidence is starting to mount up.

Now Iím wondering what will happen as the days get longer as the sun wanders south. If these monster highs continue into August, heat will build unchecked in the centre. When a front comes through that draws a NWíly airstream ahead of it, we may see some absolutely ridiculous late winter/spring heat events across the SE of the country. Coupled with below avg rainfall we could see some really nasty fire weather.

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#1467503 - 17/07/2018 20:27 Re: Giant High Pressure Systems [Re: Eigerwand]
Eigerwand Offline
Weather Freak

Registered: 28/05/2012
Posts: 325
So this past week has seen some really significant cold
minima over nearly all of NSW and areas of QLD and itís all due to these abnormally large spanning highs. That single pressure systems have been large enough to span the entire country has made for some incredibly calm conditions, allowing for temps to really plummet at night.

I feel this has now become the defining feature of winter 2018. I would like to see it shift soon. As I mentioned in the last post, I donít like the prospect of what such conditions may entail as the suns rays grow stronger.

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#1467506 - 17/07/2018 21:27 Re: Giant High Pressure Systems [Re: Eigerwand]
Kino Offline
Weatherzone Addict

Registered: 10/08/2017
Posts: 2674
Loc: Wollongong, NSW, Aus
Hopefully it means massive low pressure over Aus in Summer?

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#1467510 - 17/07/2018 22:31 Re: Giant High Pressure Systems [Re: Eigerwand]
MOUNTAIN h2o Offline
Weather Freak

Registered: 23/03/2012
Posts: 740
Loc: Hobart Lenah Valley Tas 198 as...
Those Highs are killing our past climate statistics, we are entering a new age of continuous dry hot conditions in the South East.

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#1467519 - 18/07/2018 05:40 Re: Giant High Pressure Systems [Re: Kino]
Eigerwand Offline
Weather Freak

Registered: 28/05/2012
Posts: 325
Hmmm, Iím not sure (obviously haha). Perhaps this could be a sign of a significant El NiŮo on the way? In that case the monsoonal lows over the tropics would be less active.

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#1467521 - 18/07/2018 07:39 Re: Giant High Pressure Systems [Re: Eigerwand]
Mcbobbings Offline
Weather Freak

Registered: 22/06/2018
Posts: 57
As someone who has just become interested in weather recently, what would a winter of 30 or 40 years ago have looked like in terms of frontal activity? How often would a front reach Sydney for example? From my own observations of the past 3 years it seems fronts hit Sydney every 3 or 4 weeks from May to October.

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#1467527 - 18/07/2018 08:56 Re: Giant High Pressure Systems [Re: Mcbobbings]
ozthunder Offline
Weatherzone Addict

Registered: 23/09/2001
Posts: 3209
Loc: Mt Warrigal, NSW, Australia
Originally Posted By: Mcbobbings
As someone who has just become interested in weather recently, what would a winter of 30 or 40 years ago have looked like in terms of frontal activity? How often would a front reach Sydney for example? From my own observations of the past 3 years it seems fronts hit Sydney every 3 or 4 weeks from May to October.


Ones memory gets 'condensed' into remembering the significant events and forgetting the mundane. I am 61 but I am certain there were more snow days at Robertson 30-40 years ago than over the last 10-20 years.

My most vivid memory was around 18 years old and having an after work surf with snow at Robertson clearly visible from the beach. It was that cold that when i got out, I could not wrap my hand around the edge of surfboard to carry it, so had to go dry and warm up before retrieving the surfbaord.

Lastly my trustly "World Weather Guide" which is a book of temperature and rain tables from across the world published near 40 years ago has the average Sydney June and July maximum as 16C, nowdays that is below average.
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#1467528 - 18/07/2018 09:48 Re: Giant High Pressure Systems [Re: Eigerwand]
Kino Offline
Weatherzone Addict

Registered: 10/08/2017
Posts: 2674
Loc: Wollongong, NSW, Aus
Nostalgia is an effective filter sorry - I recall the 80's were terribly dry and hot until the massive La Nina at the end. That's one of the problems with climate science - it's always re-writing or downplaying history. But Dorothea McKeller nailed our climate in the 1900's.

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