Victoria: Low & Cold Front - 20-24 November 2018

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Gordon
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Victoria: Low & Cold Front - 20-24 November 2018

Post by Gordon » Thu Nov 15, 2018 5:01 pm

As Gough once said, it's time :).

While the usual fear of failure applies this far out, the models seem to be holding for half decent to decent rain across a fair bit of the state, and maybe cold enough for alpine snow at the end.

Wilko
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Re: Low & Cold Front 20-22 November

Post by Wilko » Thu Nov 15, 2018 5:35 pm

Yes potential for something really Big
If it bombs near us we may have to name it !
I'm almost afraid to say anything for fear of jinxing it

StratoBendigo
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Re: Low & Cold Front 20-22 November

Post by StratoBendigo » Thu Nov 15, 2018 6:17 pm

It keeps downgrading (as usual). We'll end up with just a few mm North of the Divide.

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Re: Low & Cold Front 20-22 November

Post by Sean » Thu Nov 15, 2018 6:40 pm

I think we're all wise to the fact that these week-out models don't really mean anything, other than to predict 'something may happen'

I can see the sensational News.com.au articles already :D

It's going to be one of those cases where a few locales nudge 40mm but falls way below expectation. If it really happens over a two-day period, it may end up better, but Melbourne will probably see flooding. I mean, f***, if it 10mm hammers down fast enough part of the city look like Venice.

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Re: Low & Cold Front 20-22 November

Post by jimmyay » Thu Nov 15, 2018 9:34 pm

It’s interesting as at times the models hold a long way out and very reliable but right now seem to be overestimating rainfall events. I wonder why that is.

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Re: Low & Cold Front 20-22 November

Post by wobbie » Thu Nov 15, 2018 9:35 pm

Well just as much chance of it bombing on us as a sprinkle north of the divide, somewhere in between more likely, whatever bring it on

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Re: Low & Cold Front 20-22 November

Post by JasmineStorm » Fri Nov 16, 2018 8:03 am

In my opinion, not too much point looking at rainfall totals at this stage as models will find it impossible to pin point where the cyclonic bombing gyre will form, until maybe within 24 hours.... and maybe not at all. I've seen models get this wrong within 6 hours of the surface cyclone forming. EC in April 2017 missed a developing low centre centre by 200 km in Bass strait and a 80 to 120mm convergence zone was sent west of Melbourne and into the Macedon Ranges when no rain was projected.

For now, its all about the fracturing polar jet stream, upper cold core cyclone, Rossby wave, atmospheric river from the tropics and how warm the Tasman currently is. If the upper low moves into S.A, the chances of bombogenesis in Bass Strait increase :)

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Re: Low & Cold Front 20-22 November

Post by Gordon » Fri Nov 16, 2018 9:13 am

Well at least it's still hanging in there on this morning's WATL and giving us something to talk about; not that that's any iron-clad guarantee :):
Image

StratoBendigo
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Re: Low & Cold Front 20-22 November

Post by StratoBendigo » Fri Nov 16, 2018 9:35 am

If it holds together I can see 10-15mm here next week.

Interestingly the BOM reckon December will be wet along the Eastern seaboard, especially in NSW (perhaps a warm Tasman Sea influence).

Adam38
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Re: Low & Cold Front 20-22 November

Post by Adam38 » Fri Nov 16, 2018 3:18 pm

Have just arrived at Tweed Heads (20km South) and already I see storms developing to my west 😁

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Re: Low & Cold Front 20-22 November

Post by hillybilly » Sat Nov 17, 2018 6:51 am

Progs look very good this morning. Widespread 50-100mm the next seven days. Not a lot of difference between them. Expecting widespread showers, rain and storms, then a very wet and windy cyclonic swly spell. Could well be some very heavy falls in the Yarra Ranges and a decent storm surge if the progs come off. I’ve seen these systems easily deliver 100mm plus in the Dandenongs, though details matter a lot.

NW won’t do so well, but rest of Vic should do ok to good.

EC has a big follow up system too :D

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Re: Low & Cold Front 20-22 November

Post by Tassiedave » Sat Nov 17, 2018 7:50 am

Wow! Big upgrade for Tassie this morning especially for the East Coast. Raincast looking at 150mm in the North East highlands.

Wilko
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Re: Low & Cold Front 20-22 November

Post by Wilko » Sat Nov 17, 2018 7:56 am

Models have been very consistent with regard to the Jet and polar vortex
Now looking forward to minor details which will hopefully deliver
Interestingly the Tasman is up to 4c above ave
😲😳👍

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Didjman
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Re: Low & Cold Front 20-22 November

Post by Didjman » Sat Nov 17, 2018 8:03 am

The Currawongs here have been "wolf whistleing" for 2 days now - a definate sign of upcoming "bad" weather :D

StratoBendigo
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Re: Low & Cold Front 20-22 November

Post by StratoBendigo » Sat Nov 17, 2018 8:43 am

Dunno. BOM are still sticking with just 10mm for here which is consistent with recent systems.

A rapidly warming Tasman Sea in November is what happened last November too. A hot and dry summer coming up.

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Re: Low & Cold Front 20-22 November

Post by JasmineStorm » Sat Nov 17, 2018 9:51 am

The size of this projected upper low is not normal. For this time of year, I can't remember seeing a cold breach into the tropopause this size over mainland Australia before. Almost hard to believe it will happen. The upper low that penetrated S.A, Vic and NSW last December was about a third of the size. The initial trough on Tuesday night will have a tropical water slide running into it. Then this could go completely nuclear in eastern Bass strait on the surface when the moisture advection machine kicks in from the Tasman on Thursday. As expected, models just can't lock in an agreement on where the cyclonic bombing gyre will reside.

The hype train is now departing, all aboard :D

StratoBendigo
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Re: Low & Cold Front 20-22 November

Post by StratoBendigo » Sat Nov 17, 2018 10:37 am

JasmineStorm wrote:
Sat Nov 17, 2018 9:51 am
The size of this projected upper low is not normal. For this time of year, I can't remember seeing a cold breach into the tropopause this size over mainland Australia before. Almost hard to believe it will happen. The upper low that penetrated S.A, Vic and NSW last December was about a third of the size. The initial trough on Tuesday night will have a tropical water slide running into it. Then this could go completely nuclear in eastern Bass strait on the surface when the moisture advection machine kicks in from the Tasman on Thursday. As expected, models just can't lock in an agreement on where the cyclonic bombing gyre will reside.

The hype train is now departing, all aboard :D
I'm not onboard quite yet. Closest parallel to a system could be this in 14-16 Nov 1988:
http://www.australianweathernews.com/da ... 988_11.HTM

Wilko
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Re: Low & Cold Front 20-22 November

Post by Wilko » Sat Nov 17, 2018 12:44 pm


StratoBendigo
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Re: Low & Cold Front 20-22 November

Post by StratoBendigo » Sat Nov 17, 2018 2:42 pm

Incidentally, the Nov 1988 system dropped a mere 9mm in Bendigo, but 30mm in Melb CBD. My gut feel is that it could be very similar.

Another system in the ballpark is early-Dec 1987. 60mm in Melbourne, but a generous 50mm in Bendigo. I well remember it as a school kid on a camp in South Gippsland that got well and truly washed out. And that was a 'wetter than average' El-Nino year.

Adam38
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Re: Low & Cold Front 20-22 November

Post by Adam38 » Sat Nov 17, 2018 5:47 pm

I hope I find a decent amount of rain in the gauge when I come back home! I know it’s off topic but I am about to be hit with a
huge thunderstorm here on the Tweed Coast. Apparently it’s droping larger than golf ball size hail...

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