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Two more lows 12-18 April

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hillybilly
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Re: Two more lows 12-18 April

Post by hillybilly »

stevco123 wrote: Fri Apr 14, 2023 12:26 am Slightly off topic but relevant:

Bedout Island off the WA coast has just had a wind gust of 289 km/h, and sustained winds of over 210km/h thanks to cyclone Ilsa. Not a nice place to be.
Yet to be confirmed but possible this was the strongest TC on record at land fall in that region. Be interesting to see how the official assessment go. That’s based on mean winds, and might turn out that it fell short. It is hard to know with such things. As we saw the sensors on both AWSs which fell under the storm failed just shy of 300km/hr. I find it quite interesting that they can survive even to those levels, but guess fortunately there isn’t too much debris on small islands. The photos from Pardoo looked like tornado like damage with tree stripped off leaves, which is pretty unusual. Tough times for those folks, but hopefully all fixed soon.

The local climate conditions were extreme. SSTs off the coast are just above 32C at their peak and the cyclone was ventilated by a strong approach upper trough. Very lucky that the region is so sparsely populated and the tilde have a very big range so damaging storm surges are rare. I suspect the reason why our rainfall is holding up atm despite the rapidly warming pacific is because we are tapping that region for moisture.

One thing to watch is the flip side benefit of the system. Apparently the TC Seroja in 2021 was a key factor in the record wheat crop that year in WA. Heard a quote that it was responsible for 5 million tons which is probably an overestimate but might be ball park. That puts the rain from the system at somewhere between $1 and $2 billion of benefit.

Anyway, back to our weather next post which looks pretty interesting on the latest runs.
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hillybilly
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Re: Two more lows 12-18 April

Post by hillybilly »

Been a bit quiet waiting for the system to get close and details to settle but now looks pretty clear.

Rain spreading east today, becoming heavy near the wind change from early evening when the moisture and divergence better align. Possible we will see a weak surface low form in the deep trough early hours of Sunday near Bass Strait which will temporarily slow down the system and up the rainfall in eastern areas of Victoria and northern and eastern Tasmania.

At this stage expecting 25-50mm with locally heavier falls for northern Tasmania and eastern Victoria. Eastern Tasmania should also do very well, but depends a fair bit on the formation of the low… around Hobart models range from around 15mm to more than 60mm. Hopefully this one delivers given the rapidly emerging El Niño signature in the pacific.

Btw the MJO is about to become unfavourable for us and put a strong westerly wind burst into the central pacific so anticipate a this next spell might be the last big one for a while. Guess we will see.
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Gordon
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Re: Two more lows 12-18 April

Post by Gordon »

Waiting game: models vs obs :).

Looks like a slight upgrade of the former this morning, but I suppose all will be revealed over the next 24 hours...
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Re: Two more lows 12-18 April

Post by stevco123 »

Doesn't really get better than this setup in some regards. Don't worry what the models say. They're flawed - which is a topic for another day.

Look at the obs. We have an ex-cat 5 cyclone and a cold front tapping into that. It looks great watching the satellite over the past 5 days. It will rain nicely over a few hours. Which places get the most is always anyone's guess.
https://www.weatherlink.com/bulletin/53 ... 76dd68e8bc: for current weather updated every 2 minutes
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Re: Two more lows 12-18 April

Post by Dane »

Very underwhelmed by this sysytem so far, not a drop as yet.
Radar doesnt look that promissing either.
Wont use the F word yet but not looking that good right now
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Re: Two more lows 12-18 April

Post by QldTwister »

Its gonna be a bloody wet 24 hours for central and E Vic but west miss out again

Widespread 20-40mm if love rain ya gonna love this arvo and evening even around Melb same wet wet arvo and evening and night

Enjoy the rain
Bring on the heat and stroms
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Re: Two more lows 12-18 April

Post by StratoBendigo »

This one is taking an awful long time to get going. Yes, I smell a fizzer...
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Re: Two more lows 12-18 April

Post by stevco123 »

Rain has set in nicely now here. Looks to be a wet one for midnight mass tonight for Orthodox Easter (happy easter to all the Macedonians, Russians, Serbians, Ukrainians, Bulgarians, Romanians, Greeks and others that will be celebrating tomorrow)
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Re: Two more lows 12-18 April

Post by Didjman »

Rain? Who said rain?
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Re: Two more lows 12-18 April

Post by StratoBendigo »

Rain has picked up here. Now at 12mm today.
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Re: Two more lows 12-18 April

Post by Gordon »

7mm so far here. Not big drops (hardly hear it on the roof) but very dense rain, one step up from heavy drizzle.

Hard system to read, but rain seems to keep streaming in from the north, and goes back to the west a fair way, so could be quite a bit more. Smashing down in the Adelaide area, and another active line has moved into far western Victoria. Not calling it a fizzer just yet...
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Re: Two more lows 12-18 April

Post by jimmyay »

It does stretch back a long way, both west and north, it’s still raining in Adelaide.

We could be in for quite a drenching.
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Re: Two more lows 12-18 April

Post by Didjman »

We have water coming down here too now lol. Almost strange.
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hillybilly
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Re: Two more lows 12-18 April

Post by hillybilly »

Wet night coming up potentially very wet. The upper trough is sharpening up and a jet streak is coming around the top and approaching central Vic. This will give the upper level divergence a boost and be associated with a band of heavy rainfall through central and eastern vic and Tas overnight. Models been onto this for a while and now get to watch it. Can see the thickening happening on radar :D .

Expecting around 30mm here overnight, and similar for Melbourne. Eastern ranges of Vic and northern and northeast Tas will do better.
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Re: Two more lows 12-18 April

Post by Wilko »

As predicted radar thickening just east of me
Potential for 2 inches :o
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Australis(Shell3155)
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Re: Two more lows 12-18 April

Post by Australis(Shell3155) »

14.40mm so far..
light constant
Happy to have no wind.
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Re: Two more lows 12-18 April

Post by Onetahuti »

25.4mm @ 9PM well above the range that was forecast, certainly not a fizzer at least here.
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Re: Two more lows 12-18 April

Post by jimmyay »

Surprised there isn’t a heavy rain warning out tbh
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Re: Two more lows 12-18 April

Post by Wilko »

23mm here...happy days with heaps more to come overnight
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Re: Two more lows 12-18 April

Post by Gordon »

Up to 14mm here and 26mm for the dates. We're well past our April average and yes, still a lot more rain to come tonight.

Going to be interesting to read the Nylex in the morning.
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