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#1433403 - 09/09/2017 16:36 Re: NSW/ACT day to day weather [Re: Grant]
Wave Rider Offline
Meteorological Motor Mouth

Registered: 27/01/2014
Posts: 6876
Well I must say, today has been a cool but absolutely delightful day. The light SEer has been very pleasant.

Thanks for that formula Steve. So from the top of the escarpment here, one can see approximately 84km towards the horizon (assuming it's flat?- otherwise you'd see further?).

Of course the formula is flawed in the way that if your height was exactly 0m you would see 0m which wouldn't be true.


Edited by Wave Rider (09/09/2017 16:40)
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The longer you wait for storms, the more you appreciate them.

2017-18 storm total= 11
Oct 25th
Nov 6th(3), 17th
Dec 2nd, 14th
Jan 2nd(2), 8th(2), 9th

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#1433407 - 09/09/2017 17:15 Re: NSW/ACT day to day weather [Re: Wave Rider]
Steve777 Online   content
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Registered: 20/10/2011
Posts: 4221
Loc: Artarmon (Sydney North Shore)
From the top of Summit of Mt Kembla, looking out over the Ocean on a clear day, the sea horizon would be 82.5 km distant. You would see cloud tops further away than that - theoretically, for cloud 5,000 metres above the sea, up to 252 + 83 = 335 km in conditions of perfect visibility (unusual over such a distance).

The distance gets smaller the lower down you are. So if you're standing in a hole with your eyes 5 cm about a flat surface, you could see about 800 metres. An ant with eyes 1mm off the ground with no tall objects like blades of grass in the way could see about 100 metres (don't know if the can see that far).

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#1433414 - 09/09/2017 18:05 Re: NSW/ACT day to day weather [Re: Grant]
Wave Rider Offline
Meteorological Motor Mouth

Registered: 27/01/2014
Posts: 6876
Interesting, I've always wondered how far you could see on the horizon. When I came back from that snow chase I was near the top of Jamberoo Pass and could actually see Pigeon House Mountain which really surprised me. It's 87km from my vantage point and I drew a line on Google Earth and then looked on the elevation profile of the line and there is no higher ground between Robertson and PHM so I know that was definitely it.

Btw my number of 84km distance for the escarpment was calculated from Bong Bong Pass' elevation which is about 550m ASL.


Edited by Wave Rider (09/09/2017 18:06)
_________________________
The longer you wait for storms, the more you appreciate them.

2017-18 storm total= 11
Oct 25th
Nov 6th(3), 17th
Dec 2nd, 14th
Jan 2nd(2), 8th(2), 9th

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#1433415 - 09/09/2017 18:25 Re: NSW/ACT day to day weather [Re: Grant]
Steve777 Online   content
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Registered: 20/10/2011
Posts: 4221
Loc: Artarmon (Sydney North Shore)
From a couple of vantage points in the Bankstown area when I lived there, you could see The Gib (Mt Gibralter, 863m, near Bowral) as a small hump on the SW horizon. I just measured the distance on Google - close to 83 km.

In those days, there were no high rise buildings in the area and more open space. Don't now if you can still see it now.

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#1433417 - 09/09/2017 18:49 Re: NSW/ACT day to day weather [Re: Grant]
kizz Offline
Weatherzone Addict

Registered: 11/02/2002
Posts: 1990
Loc: Beacon Hill, Sydney 152m asl
I saw some doco a while ago where some of the best vantage points to capture sprites and jets was at the eastern edge of the Rocky Mountains looking east over the plains.

I cannot remember where in the Rockies it was so can't use the formula. The night time view of distant t-storms was stupidly far.

Today was a bit fresh in the southerly but I can take these runs of cloudless, sunny days for ever. Until my rain tank runs dry that is. Then a decent storm dumping several centimetres would do just fine. Need rain water for my carnivorous plants. Tap water kills them.

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#1433418 - 09/09/2017 19:13 Re: NSW/ACT day to day weather [Re: Grant]
Wave Rider Offline
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Registered: 27/01/2014
Posts: 6876
It was probably somewhere on the Front Range near Denver.

Steve, it's possible that the mountain you could see was Mt Jellore. It is a very distinct steep, almost symmetrical hump. I'm not quite sure what The Gib looks like though.
_________________________
The longer you wait for storms, the more you appreciate them.

2017-18 storm total= 11
Oct 25th
Nov 6th(3), 17th
Dec 2nd, 14th
Jan 2nd(2), 8th(2), 9th

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#1433424 - 09/09/2017 19:38 Re: NSW/ACT day to day weather [Re: Wave Rider]
Kino Offline
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Registered: 10/08/2017
Posts: 2255
Loc: Wollongong, NSW, Aus
Originally Posted By: Wave Rider
Well I must say, today has been a cool but absolutely delightful day. The light SEer has been very pleasant..


Surprise! A lighter wind day! Out of the breeze it was actually nice (I wore a t-shirt!)

Tonight looks cold, light wind & temp plummeting. Tomorrow looks ok too.

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#1433432 - 09/09/2017 20:02 Re: NSW/ACT day to day weather [Re: Grant]
Kino Offline
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Registered: 10/08/2017
Posts: 2255
Loc: Wollongong, NSW, Aus
Already in single digits (7.6 no less!) and it's only 8pm! It'll surely be colder than 5 tonight. I tip 3 maybe even 2.

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#1433436 - 09/09/2017 21:23 Re: NSW/ACT day to day weather [Re: Grant]
EddyG Online   content
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Registered: 19/12/2008
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Loc: Port Stephens NSW
Thanks Steve777, I'll check that link out when I'm less inebriated!!
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#1433457 - 10/09/2017 06:53 Re: NSW/ACT day to day weather [Re: Grant]
Kino Offline
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Registered: 10/08/2017
Posts: 2255
Loc: Wollongong, NSW, Aus
Min bottomed out at 2.9 which is nearly 5c below average and over 2 below forecast.

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#1433469 - 10/09/2017 09:36 Re: NSW/ACT day to day weather [Re: Grant]
DerekHV Offline
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Registered: 12/02/2010
Posts: 1129
Loc: Aberglasslyn (Maitland) NSW
Still very cold nights, only 2C minimum for today, and a light ground frost around early on this morning.
Winter is still trying to hang on, and is going to die hard it seems.
Things are looking brighter from here though, Wed upgraded to 34C after 30C on Tuesday.
Such temps this time of year are hot, but still quite benign compared with such temps in summer, due to the high diurnal ranges and low humidity.

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#1433481 - 10/09/2017 11:49 Re: NSW/ACT day to day weather [Re: Grant]
Stormy3 Offline
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Registered: 12/06/2013
Posts: 1718
Loc: Ellalong,10kms SW of Cessnock ...
it is so dry here,if it doesn't rain soon we will start to turn into a desert.
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#1433507 - 10/09/2017 15:42 Re: NSW/ACT day to day weather [Re: Stormy3]
DerekHV Offline
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Registered: 12/02/2010
Posts: 1129
Loc: Aberglasslyn (Maitland) NSW
Originally Posted By: Stormy3
it is so dry here,if it doesn't rain soon we will start to turn into a desert.


Agree, there has been 0.0mm of rain since after August 4th.
And looks like this will continue for at least another week, could even be a zero rain month.
Water tank is empty, it is annoying.

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#1433524 - 10/09/2017 17:01 Re: NSW/ACT day to day weather [Re: Grant]
Wave Rider Offline
Meteorological Motor Mouth

Registered: 27/01/2014
Posts: 6876
We are undergoing desertification here as well guys. Grass is pretty close to being dead everywhere around the place. We have had almost no rain since August 4th here (1.8mm, and 0.6 of that was likely dew.)

Also had the driest July on record with 1.4mm.

Probably the driest winter on record too as we have only had about 30mm in a 3 month period. There was 34mm at the start of June but that was over 3 months ago now since we're at the 10th of the month now.

Fairly pleasant today but still waaay below what it should be for this time of year, with 15 degrees on the coast. I reckon this week has certainly felt like the coldest of the year. Other weeks in winter were cold but not every single day in a week.


Edited by Wave Rider (10/09/2017 17:06)
_________________________
The longer you wait for storms, the more you appreciate them.

2017-18 storm total= 11
Oct 25th
Nov 6th(3), 17th
Dec 2nd, 14th
Jan 2nd(2), 8th(2), 9th

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#1433528 - 10/09/2017 17:09 Re: NSW/ACT day to day weather [Re: Grant]
EddyG Online   content
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Registered: 19/12/2008
Posts: 4953
Loc: Port Stephens NSW
Pleasant enough day here, not overly warm probably just nudged 20c. Thankfully it was windless day for once!!
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#1433532 - 10/09/2017 17:23 Re: NSW/ACT day to day weather [Re: EddyG]
Kino Offline
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Registered: 10/08/2017
Posts: 2255
Loc: Wollongong, NSW, Aus
Originally Posted By: EddyG
Pleasant enough day here, not overly warm probably just nudged 20c. Thankfully it was windless day for once!!


Yassssss nicely appreciated too smile still felt warmer in the sun too than 18. Next week still looks like finishing cold and into the weekend.

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#1433534 - 10/09/2017 17:30 Re: NSW/ACT day to day weather [Re: Wave Rider]
Rsav Offline
Weather Freak

Registered: 07/12/2016
Posts: 82
Originally Posted By: Wave Rider
It was probably somewhere on the Front Range near Denver.

I saw a TV doco about that subject too. A man takes very distant photos of sprites and jets from his house high up on a Colorado mountain side looking east across the flat plains. The storms were so far away they were probably in another state.

Originally Posted By: Wave Rider
Steve, it's possible that the mountain you could see was Mt Jellore. It is a very distinct steep, almost symmetrical hump. I'm not quite sure what The Gib looks like though.

Probably right there WR. Here is a photo taken from Sydney by Highranger, posted on Flickr: https://flic.kr/p/6NCCVj

Speaking of distant views WR, did you know that you can see Bondi Junction (100km away, in Sydney's eastern suburbs) from the summit of Saddleback Mountain (near Kiama) on a clear day? The top of Sydney Tower and a few other CBD skyscrapers can also be seen, jutting above the Illawarra Escarpment. A similar view can also be had from the clifftop lookout at Barren Grounds Nature Reserve that looks over Wollongong. Sydney skylines including the CBD, North Sydney, St Leonards, Chatswood, Olympic Park and Parramatta can also be seen from the Mittagong Lookout (or even better from the rock outcrop above the lookout) on Mt Gibraltar (The Gib) on a clear day. These are up to about 100km away!


Edited by Rsav (10/09/2017 17:34)

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#1433538 - 10/09/2017 17:41 Re: NSW/ACT day to day weather [Re: Grant]
Wave Rider Offline
Meteorological Motor Mouth

Registered: 27/01/2014
Posts: 6876
Thanks for that pic Rsav, certainly is Mt Jellore.

No I did not know that, and in fact I haven't seen any of Sydney from there, but I believe you as I have seen Saddleback Mtn from the southern suburbs of Sydney. Would have to be an exceptionally clear day I would imagine. I have seen Sydney skyscrapers from The Gib though.

Went to Maianbar today which is near Bundeena. I cheated a little with the pic, enhanced the colour to make it look like a clearer day. The easterly was a bit hazy which didn't look as nice.

The only half decent shot I got, looking towards Bundeena.



Edited by Wave Rider (10/09/2017 17:44)
_________________________
The longer you wait for storms, the more you appreciate them.

2017-18 storm total= 11
Oct 25th
Nov 6th(3), 17th
Dec 2nd, 14th
Jan 2nd(2), 8th(2), 9th

Top
#1433550 - 10/09/2017 18:48 Re: NSW/ACT day to day weather [Re: Rsav]
Steve777 Online   content
Weatherzone Addict

Registered: 20/10/2011
Posts: 4221
Loc: Artarmon (Sydney North Shore)
Interesting, I'm pretty sure that's the bump on the horizon, so that must have been Mt Jellore, not 'The Gib'.

-----

Nice picture WR. I like to dial up the colour a little bit, maybe increase the contrast a little.

------

The oceans inshore are now colder than what the temperature on land would otherwise get to, so the sea breeze is more active than it's been for a while. It seems to be harder to get to 20 on the coast now. According to MHL, sea temps off Sydney are about 18, but it might be colder inshore. I notice that the NE'er holds the temperature up after sunset until it dies off mid to late evening.

Nice warm spell coming up, 31 is back on for Sydney on Wednesday and it looks like it will get there.


Edited by Steve777 (10/09/2017 18:52)
Edit Reason: Photo. Harder to get to 20.

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#1433555 - 10/09/2017 18:55 Re: NSW/ACT day to day weather [Re: Steve777]
Kino Offline
Weatherzone Addict

Registered: 10/08/2017
Posts: 2255
Loc: Wollongong, NSW, Aus
Originally Posted By: Steve777
The oceans inshore are now colder than what the temperature on land would otherwise get to, so the sea breeze is more active than it's been for a while. According to MHL, sea temps off Sydney are about 18, but it might be colder inshore. I notice that the NE'er holds the temperature up after sunset until it dies off mid to late evening.

Nice warm spell coming up, 31 is back on for Sydney on Wednesday and it looks like it will get there.


Not sure if you know about this site, but it's a quite handy point and click (though a bit lacking in data) http://ocean-grids.csiro.au/nrt-sst/limage/web-maps/nrt-sst/20170908_0842.20170909005544.n15.nc

Inshore temps vary between 15/16 off the Illawarra (brrrr) to 16/17 off Sydney and 18-20 off the continental shelf. Still think that while those warmer SST's are further off the coast we will struggle to get any decent rain over us.

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