Heavy rainfall expected for parts of the east

Australian Community Media

Some areas around the South Australian, NSW, and Victoria border may be in for some localised flooding.

Transcript

00:00 Hi, it's Christy at the Bureau here to update you about the heavy rainfall that we're expecting

00:04 over parts of the east coast in the next few days.

00:08 So let's start with our synoptic weather pattern.

00:10 Now the system that really interests us is this low pressure trough over South Australia

00:14 at the moment.

00:15 And we can see that while by the end of today that system has mostly weakened out, we continue

00:20 to see showers continuing over inland parts.

00:23 Now this is because there's an upper low pressure system moving across the country.

00:27 And as we move into tomorrow, we can see those showers extending eastwards as the upper low

00:32 moves eastwards.

00:34 Now pretty light falls expected with those showers, but the impact of that upper low

00:38 will be to deepen a coastal trough along the coast.

00:41 And this is the weather system that's going to give us all the rainfall.

00:44 So by the end of tomorrow, we can see those winds starting to push in, showers and thunderstorms

00:49 pushing into southeastern parts of New South Wales.

00:53 And as we go into Thursday, that just continues with the coastal trough deepening, a low

00:57 pressure system forming, and rain and thunderstorms continuing to push into southeastern parts

01:04 of New South Wales.

01:06 On Friday, we can see some of that heavier rainfall even extending down into parts of

01:10 eastern Victoria as well.

01:12 And that low pressure system still sitting close to the coast and pushing that rain and

01:16 thunderstorms onto the coast.

01:19 But by Saturday, even though there is still some rain and thunderstorm risk in the morning,

01:23 by the end of the day that system is moving away and we do see back to just a few showers

01:28 for the rest of the long weekend.

01:31 So how much rainfall are we expecting?

01:33 Well this map shows the rainfall between now and the end of Saturday, and what we can see

01:38 is the heaviest rainfall expected over southeastern parts of the country.

01:42 So let's zoom in on that area.

01:45 These orange areas show widespread falls of over 50 millimetres with this system, but

01:50 of most interest are these pink and purple areas which are where we're expecting to see

01:54 potentially 100 to 200 millimetres or more.

01:59 Now currently that area extends from south of Wollongong down to the south coast, and

02:03 also the inland ranges, possibly even extending as far as parts of the ACT.

02:09 At the moment, Sydney not expecting to see the heaviest rainfall, although it will still

02:13 be a wet few days up there, but it will depend heavily on the exact movement of this trough

02:18 and low pressure system as to where we see the heaviest rainfall.

02:22 Now with the potential for well over 100 millimetres in some places, we are expecting to see flood

02:28 impacts.

02:29 In terms of riverine flooding, we are expecting to see river rises in catchments that have

02:33 seen recent rainfall, so the catchments are wet, and those that get the heaviest rainfall

02:38 with this system.

02:39 So we will start to issue flood warnings as we see the rain starting to fall and the river

02:43 starting to rise in response.

02:46 We also have particularly high tides along the coast this week, and so combined with

02:50 this heavy rainfall, we could see minor flooding in some of our tidal rivers as well.

02:56 And finally, there is the risk of flash flooding with this system, in particular with thunderstorms.

03:01 We could see thunderstorms each day, and that could give us rainfall falling over a short

03:06 period of time and giving us the risk of flash flooding.

03:09 So a lot of flood risk to consider over the next few days.

03:13 This is a developing situation and warnings will be issued over the next few days, so

03:17 it's really important to stay up to date on the Bureau's website and our app.

03:21 Make sure you've enabled push notifications to get the latest warnings direct to your

03:25 phone, and follow all advice from emergency services.

03:28 [Music]

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