We’ve got a dynamic and likely quite wet spell of weather coming up. This animation shows the weather forecast for the next 10 days – you can see that once the change moves through on Wednesday we get into a pattern of onshore winds with showers and longer spells of rain:
There could be some decent falls coming up – but this event will likely be categorised by how long it lasts rather than a huge fall on one day. The accumulated rainfall for the next 10 days shows it well, with the totals increasing day by day rather than a huge fall on any one day:
I’ve selected late next week to show some of the totals forecast by the models. You can see it more dramatically in these forecast rain totals from ECMWF:
Both show some BIG totals looking likely…but don’t focus on the numbers – more on the indication of wet weather ahead and some decent rain totals likely, which over a week or so could accumulate into some higher end totals by the time it clears through. Usually when we see these totals forecast it is from an event lasting a couple of days – and over a short period of time such totals would likely bring some flooding. With this event forecast to last for a significant period of time it means the ground has more time to absorb the rain, meaning lower fast river rises…but also worth noting that a couple of models show a low forming offshore across SE Qld or NE NSW – and if that happened we could see some bigger totals if it formed just to our north.
Before we kick off the rain we’ve got another two days of storms likely. Some around today, much as yesterday, but a significant increase likely tomorrow as the change moves up and turns winds more onshore. The forecast temps over the next 10 days show it well – much higher daytime peaks forecast today and tomorrow, with much lower totals to follow as cloud and showers increase and winds turn more onshore:
So an interesting spell of weather coming up. I’ll post more, both here and on the Facebook page, as we head into it.
Gratitude: Many thanks as always to weather.us and tropicaltibdits for the charts and images.
** Longer article – click on the link to see all images if reading this on Facebook **
We had one change move through overnight bringing us a little rain – only 1.2mm recorded in town. The next change moves through over the weekend and once again it will bring some bigger falls inland. As this one moves towards the coast there are some signs however that we could be in sweeter spot this time around, with winds turning onshore temporarily late Sunday and through Monday. With a cold change moving through up high there will be some decent instability around. Combine that instability with a whole heap of moisture moving in from the north west and onshore winds at low levels…and we could see some decent falls. It is still some time off so there is time for us to move back out of favour but right now we’ve got the models looking like this:
European Model – the best of the bunch:
American model – next best model around:
…and the Australian model – this is the only one not so keen right now…but was also the best at predicting the last system so definitely worth giving it a consideration:
I’ll post more as we get closer, but we are sitting below average right now and this is a good time to get some rain into the earth. Fingers crossed it comes together.
First hints of some wetter weather possible next week with onshore winds coming in off a warm ocean. What sort of totals? Way too early to have any idea. As is usual at this time frame some models showing heaps while others show very little. A couple of options in the images below – BUT take the totals with a pinch of salt, likely to change a lot over the next few days as the models get a handle on what is likely to happen – we could see nothing, we could see heaps.
First image from the latest US model run:
This is from the Australian model this morning:
But the latest European run doesn’t think much of it:
If this event does come off it we are more likely to see rain and showers move inland, unlike the offshore thunderfest a few weeks back. Once it becomes clearer I’ll post again
We’ve had some showers come across last night and will likely see more later today. The heaviest of the showers however have been streaming north along the coast. You can see the steering winds at 10am today in this wind chart from Weatherzone (steering winds are the winds at the height in the sky that decide which direction showers and storms will move – this is different to surface wind direction):
…but by 10pm tonight the steering winds are turning more onshore:
…so we we have into tonight there is a greater chance for showers to move across our region. By 10pm Monday night you can see how strong the steering winds have become, sending showers clattering onto the coast and inland:
Looking at this stage that we will be in showery conditions until midweek, when it is looking possible for a change to push the unsettled weather out to sea. There is a chance of some very decent falls over the next few days with river rises possible. Total forecast rain over the next 4 days currently looking like this:
Details are still sketchy as to exactly what will pan out, but our region is one that can accumulate some big falls in these situations as winds come ashore and are forced to rise over the mountains, so it’s worth being aware that we could see some river rises in the next few days. I’ll post again tomorrow with an update.
Looking increasingly likely that significant areas of the east coast will see some large rain totals next week. A trough will deepen along the coast in response to increasingly cold air up high and very warm ocean temperatures. Current ocean temperatures off our coast are up around 26C:
A cold pool will develop, likely just to our north. This cold pool will bring strong instability as well as drawing winds up high from off the ocean:
There is the chance the trough developing along the coast might even deepen enough to support the formation of an east coast low:
If an east coast low does develop, areas to the south will see some significant impacts. The details are all up in the air right now – but coming into focus with the potential for a significant east coast rain event. Average forecast totals over the next 8 days are very much on the rise:
So what will happen? It’s like putting a pan of water onto boil and trying to forecast where the first bubble will appear on the bottom of the pan – we know it is going to happen, just not sure where. All we know now is that the conditions are conducive to a big rain event, we are a region that is prone to catching some bigger falls in these situations – and there will likely be some BIG falls out there, likely not far from us.
So the details? A chance of a storm this arvo as the instability increases. Overnight the storms die out and showers start developing off the coast, with some likely to move ashore. This is the start of the event. Those showers and rain periods will then be in play for likely the next week. As the event develops we’ll have a better idea of where is likely to see the bigger rains, and I’ll keep posting as it becomes clearer. There is no guarantee we’ll see anything huge, but the chance is there so it’s worth considering what you would need to do (if anything!) if the rivers start to rise.
After some disagreement all models are tonight showing the potential for some big fall somewhere along the east coast. Nice one EC for being the first model to pick the upcoming event. A pool of colder upper air is forecast to develop close to us early next week. You can see the yellow circle across our region on this upper temperature chart:
Once you combine cold temperatures up high with our very warm ocean temperatures and onshore winds, it is a pretty good bet that someone is going to get very wet. Sit to the north of the surface feature and you’ll likely see westerly winds and little rain…sit to the south and you’ll see easterly winds and flooding rains. And right now it is almost impossible to say exactly who will see what. Here is the current thinking from three model runs:
The ECMWF (European) Model:
The GFS (American) model:
The ACCESS (Australian) model:
All have a heap of rain falling but with a focus on different areas. I won’t post all upcoming model runs, but once things settle down and we have more information on likely impacts, if any, for our region I’ll post another update 🙂
Still looking like we are on track for a wetter change this week. Winds should be turning onshore through today, with showers moving in from later on today. Different totals from different models right now, with the European model giving the highest totals (over the next 10 days):
Before we panic…the American model is, for once, showing more restraint:
At times like this what you usually end up with is something in between. Either way after the recent dry spell the rain will be welcome – good to get some decent falls in before we head into winter. Onshore winds, some showers and more cloud means that the temperatures will be taking a bit of a dive, with tops heading more for the lower 20s. Whether we see enough rain to cause any river rises is up in the air for now (haha 🙂 ) – I’ll post more on that as it becomes clearer. Whatever happens the rain will be falling over a good number of days, giving it time to soak in rather than all run off which is good news. Enjoy the change!
Three charts for you that show forecast rain totals for next week from the onshore shower stream likely (and if reading this on Facebook you’ll need to click the link to see them all 🙂 ):
Previous model run:
And the one before that:
So what can we tell from these runs?
(1) as per the post yesterday we’re looking at some onshore showers and perhaps even longer periods of rain through the middle of next week.
(2) It looks like there could be some decent totals around
(3) Exactly where will see the bigger totals is still up in the air but is likely to be somewhere on the Mid North Coast.
Still a decent time off for this upcoming event and with 4 model runs per day we’ll likely see another 12 to 14 different outcomes before the rain arrives – but as the event gets closer we should see the totals and location start to settle down. So, right now it’s a good time for the heads up that after the heat next week there is a good chance of some decent showers and potentially decent rain totals next week…but right now still too early to know if we’ll see the big totals or not. I’ll keep watching the model runs and once things settle down I’ll post again with an update 🙂
Despite the clickbait hype on some weather pages the cyclone did, as expected, head off away from Australia. Not much impact for us at all (though if you looked hard to the east yesterday you could just see the upper cloud from the system).
Coming up we’ve got some beautiful Autumn weather and it may even get a little hot at times. Here’s for the forecast temps for Sunday by way of example:
Mainly dry too over the next few days, but by the time we head into the middle of next week we could see the winds coming in from the east once again with temperatures dropping and stream showers coming onshore. That is sometime off right now and heaps of time for it to change, but right now looking pretty similar to this through the middle of next week…you can see the showers streaming in (and a predicted significant cyclone off the west coast):
Should this pattern come off we could see some reasonable totals accumulating over a few days with local river rises possible…though way too far off for any concerns at this time. The chart shows total accumulated rainfall (and also shows the currently forecast path of the west coast cyclone):
So right now it’s time to enjoy what could be one of the last blasts of summer this weekend, and look forward to the chance of more showers next week 🙂
It was hot and steamy yesterday, with thunder rolling around during the afternoon (though much of it seemed to miss the valley again). Starting the day today with a heap of cloud and much cooler temperatures. There is a lot of instability around but with warm oceans and a cooler landmass most of the shower activity is out in the ocean right now:
That matches what the models are showing for this time of day as well. I always try to check what the models had forecast against what is happening – if the forecast to that time is pretty much on the mark then we can place more confidence in what they are forecasting is coming up. Looking at the model forecast for right now…
…and it is pretty much on the mark. That model (and a couple of other key models) is forecasting some rain and showers through the day today with those showers and storms likely to increase in intensity through tonight and tomorrow as some colder air moves through overhead:
As with all showers and storms some areas (as yesterday) will see some good totals while others see much less. Let’s hope we are in the firing line this time.
Looking further ahead it looks like getting a little drier for the rest of this week with just a few showers from time to time…but then the following week is showing some signs of something potentially coming together in the Coral Sea, as well as wetter weather for us. A long way off and this season has been one where the models have let us down with long term (week to two week) rain forecasts, so I’ll keep an eye on it and post again when we have more clarity.