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#1466854 - 03/07/2018 17:47 Re: Atmospheric Rivers [Re: Flowin]
Flowin Offline
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Registered: 15/10/2017
Posts: 937
Loc: Pinjarra Hills, Qld

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#1467870 - 26/07/2018 19:45 Re: Atmospheric Rivers [Re: Flowin]
Seina Offline
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Registered: 27/08/2003
Posts: 7727
Loc: Adelaide Hills
There may be a remote chance some time in the next 24-48 hours smile of seeing evidence of a tropical in-feed near the interior, with substantial humidity. One of the models (GFS) is showing increasing [magnitude] of pressure vertical velocity at the 700-hPa level north of Adelaide.


Edited by Seira (26/07/2018 19:49)

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#1467991 - 30/07/2018 11:35 Re: Atmospheric Rivers [Re: Flowin]
Petros Offline
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Registered: 30/12/2002
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Loc: Maffra, Central Gippsland, Vi...
.......resulting in this, according to AccG:


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#1489232 - 05/02/2019 17:21 Re: Atmospheric Rivers [Re: Flowin]
Flowin Offline
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Registered: 15/10/2017
Posts: 937
Loc: Pinjarra Hills, Qld
This total precipitable water image product for 00 UTC 3 Feb 2019, looks to me like what I would describe as a possible Atmospheric River affecting the NQ region near Townsville for that heavy rain that brought on the peak of the TSV flood on Sunday afternoon and evening.
ftp://ftp.ssec.wisc.edu/pub/mtpw2/images/tpw_nrl_colors/ausf/201902/comp20190203.000000_tpw.png
It may not exactly fit the US or other international definition of an AR (I don't know for sure) but it sure appeared to be a concentrated stream of atmosphere conveying large water amounts.
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#1490836 - 18/02/2019 17:17 Re: Atmospheric Rivers [Re: Flowin]
Flowin Offline
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Registered: 15/10/2017
Posts: 937
Loc: Pinjarra Hills, Qld
Not relevant to Australia, but of note for Atmospheric Rivers worldwide, California got hit by a significant AR event in the last week. The Americans have now developed a classification system for ARs and apparently is was a Cat 4 event.
Here is a news article link for the recent event (there are many other articles)
https://www.wired.com/story/atmospheric-rivers-get-an-intensity-scale-like-hurricanes/

Here is the technical paper about the new AR severity categories
https://journals.ametsoc.org/doi/10.1175/BAMS-D-18-0023.1

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#1490843 - 18/02/2019 17:59 Re: Atmospheric Rivers [Re: Flowin]
Kino Offline
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Registered: 10/08/2017
Posts: 3264
Loc: Wollongong, NSW, Aus
Oh thats interesting thanks. Be good to implement that here.

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#1490967 - 19/02/2019 09:00 Re: Atmospheric Rivers [Re: Flowin]
ozone doug Offline
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Registered: 06/11/2006
Posts: 1915
Loc: Roma SW QLD Eye to the West...
Thanks for the link Flowin. I agree it should be implemented in Australia.
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#1490976 - 19/02/2019 09:46 Re: Atmospheric Rivers [Re: Flowin]
Steve777 Offline
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Registered: 20/10/2011
Posts: 4906
Loc: Artarmon (Sydney North Shore)
So a NW Cloud Band would be an example of an 'Atmospheric River'.

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#1492467 - 25/02/2019 18:19 Re: Atmospheric Rivers [Re: Flowin]
Seina Offline
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Registered: 27/08/2003
Posts: 7727
Loc: Adelaide Hills
If one wished to be able to describe an atmospheric phenomenon -- here one humidity-related, phrased a "river" -- as a real thing, it would seem reasonable to make reference to something real, meaning tangible humidity (dew) or the like...rather than something more theoretical. Just an observation of sorts, however I guess it could be said that unless a definition of these things is reinforced strictly...it is open to interpretation. That is one reason to be very clear about what is meant.

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#1492478 - 25/02/2019 20:03 Re: Atmospheric Rivers [Re: Flowin]
Flowin Offline
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Registered: 15/10/2017
Posts: 937
Loc: Pinjarra Hills, Qld
Seira, I agree with your comment a definition and strict enforcement of that definition is important.
A bit like East Coast Lows, there is a definition but it seems that people like to call any low of the east coast as an ECL which then just makes it confusing and loses the reason to define a particular weather event.
Anyway for the debate on definitions of AR, this article is quite interesting.
https://journals.ametsoc.org/doi/10.1175/BAMS-D-17-0157.1
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#1492867 - 02/03/2019 13:40 Re: Atmospheric Rivers [Re: Flowin]
Seina Offline
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Registered: 27/08/2003
Posts: 7727
Loc: Adelaide Hills
Hi Flowin smile ,

The link posted in the post prior to this one would be a big deal in the context of this thread smile !


Edited by Seira (02/03/2019 13:41)

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#1493039 - 03/03/2019 22:14 Re: Atmospheric Rivers [Re: Flowin]
Kino Offline
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Registered: 10/08/2017
Posts: 3264
Loc: Wollongong, NSW, Aus
Looks like an AR developing now off WA.

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#1493053 - 04/03/2019 10:04 Re: Atmospheric Rivers [Re: Flowin]
Knot Online   content
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Registered: 01/05/2014
Posts: 2699
Loc: Toronto N.S.W
Dams of the sky. I think ancients were aware of AR
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#1493063 - 04/03/2019 12:44 Re: Atmospheric Rivers [Re: Flowin]
Beltane Offline
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Registered: 15/10/2001
Posts: 460
Loc: Warriewood 2102 NSW
Although applying more to California, this article about atmospheric rivers adds a bit more background to the subject:

https://www.nationalgeographic.com/envir...rnia-explainer/


Edited by Beltane (04/03/2019 12:45)
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#1493073 - 04/03/2019 15:47 Re: Atmospheric Rivers [Re: Flowin]
ifishcq Offline
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Registered: 31/01/2018
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Loc: Rockhampton - Xtra Dry Dust La...
I don't think Atmospheric Rivers effect Australia.
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#1493074 - 04/03/2019 15:56 Re: Atmospheric Rivers [Re: ifishcq]
ashestoashes Offline
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Registered: 22/10/2017
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Loc: Voyager Point (South West Sydn...
Originally Posted By: AMETSOC
s. In many ARDT strategies, the term atmospheric river is, by definition, restricted to features with
IVT ≥ 250 kg m1 s1
IVT(Integrated Vapour transport)

A scale to categorise ARs. A nice little paper going through the categories of ARs I'm not much into the lingo but maybe some other members may get more out of it.

If someone has the numbers on the amount of moisture a NW Cloud-band transports that would be a huge help.

One weird feature of our North-West Cloudbands is the sheer distance that moisture is transported across the continent almost unimpeded and it is only slightly by the GDR.

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#1493078 - 04/03/2019 16:40 Re: Atmospheric Rivers [Re: ifishcq]
Flowin Offline
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Registered: 15/10/2017
Posts: 937
Loc: Pinjarra Hills, Qld
Originally Posted By: ifishcq
I don't think Atmospheric Rivers effect Australia.

I agree they do not seem prevalent or perhaps not well recognised.
But also have a look at Figure 2 in this article.
https://www.annualreviews.org/doi/full/10.1146/annurev-environ-110615-085558

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#1493079 - 04/03/2019 16:47 Re: Atmospheric Rivers [Re: ashestoashes]
Flowin Offline
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Registered: 15/10/2017
Posts: 937
Loc: Pinjarra Hills, Qld
Originally Posted By: ashestoashes
IVT(Integrated Vapour transport) ....

If someone has the numbers on the amount of moisture a NW Cloud-band transports that would be a huge help.


Yes A2A that is the challenge of getting the numbers for IVT. If you look at the units of IVT, it can be simplified to product of the amount of preciptable water (often reported as mm, but equally represented as Kg/m2) and the speed it is travelling (m/s) gives kg m-1 s-1.

Preciptable water estimates can be found on the mimic-TPW product,
http://tropic.ssec.wisc.edu/real-time/mt...4hrs&anim=html5
(not much precipitable water in the current WA weather it appears).
I have not found any useful IVT products that cover Australia

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#1493164 - 05/03/2019 10:51 Re: Atmospheric Rivers [Re: Flowin]
ifishcq Offline
Weather Freak

Registered: 31/01/2018
Posts: 133
Loc: Rockhampton - Xtra Dry Dust La...
Originally Posted By: Flowin
Originally Posted By: ifishcq
I don't think Atmospheric Rivers effect Australia.

I agree they do not seem prevalent or perhaps not well recognised.
But also have a look at Figure 2 in this article.
https://www.annualreviews.org/doi/full/10.1146/annurev-environ-110615-085558


lol, I live in Rockhampton, we don't get extreme rainfall events here, so no point reading any of that.
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It's so dry the trees are bribing the dogs.
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#1493179 - 05/03/2019 13:20 Re: Atmospheric Rivers [Re: Flowin]
Seina Offline
Meteorological Motor Mouth

Registered: 27/08/2003
Posts: 7727
Loc: Adelaide Hills
Originally Posted By: Flowin
Originally Posted By: ashestoashes
IVT(Integrated Vapour transport) ....

If someone has the numbers on the amount of moisture a NW Cloud-band transports that would be a huge help.


Yes A2A that is the challenge of getting the numbers for IVT. If you look at the units of IVT, it can be simplified to product of the amount of preciptable water (often reported as mm, but equally represented as Kg/m2) and the speed it is travelling (m/s) gives kg m-1 s-1.

Preciptable water estimates can be found on the mimic-TPW product,
http://tropic.ssec.wisc.edu/real-time/mt...4hrs&anim=html5
(not much precipitable water in the current WA weather it appears).
I have not found any useful IVT products that cover Australia

Whichever measurements/figures of IWVT and TPW people can find, the calculations for finding those variables will require air and dew-point temperature, and partial water-vapour pressure data at a bare minimum (from radiosonde profiles).

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