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#1462362 - 22/04/2018 08:34 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
TWEEDSTORM Offline
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Registered: 08/01/2012
Posts: 739
Loc: Tweed Heads NSW
Was wondering why nothing on the lightning detector but it looks like it packed it in yesterday

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#1462363 - 22/04/2018 09:06 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
DDstorm Offline
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Registered: 13/05/2010
Posts: 239
Loc: Tallai, QLD
Saw the distance top flashes from those storms, just not enough elevation to see the underside from Tallai, but it had a huge vertical structure.
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#1462365 - 22/04/2018 10:24 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
gleno71 Offline
Weatherzone Addict

Registered: 09/11/2007
Posts: 1495
Loc: Australia
Nice one Seabreeze, it seems these offshore storms are extending down a long way towards Sydney.

I'm curious as to why these type of storms die off fairly quickly compared to your typical summer storms.

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#1462366 - 22/04/2018 10:28 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
Ken Kato Offline
Meteorological Motor Mouth

Registered: 05/03/2012
Posts: 5161
They're good examples of pulse thunderstorms which don't last long because the weak shear means they don't tilt over that much and their rain-cooled downdraft eventually chokes their own updraft.

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#1462367 - 22/04/2018 10:35 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
TWEEDSTORM Offline
Weather Freak

Registered: 08/01/2012
Posts: 739
Loc: Tweed Heads NSW
Wow, interesting, learn something everyday good stuff!

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#1462376 - 22/04/2018 13:56 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: gleno71]
Mike Hauber Offline
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Registered: 13/07/2007
Posts: 3086
Loc: Buderim
Originally Posted By: gleno71
Nice one Seabreeze, it seems these offshore storms are extending down a long way towards Sydney.

I'm curious as to why these type of storms die off fairly quickly compared to your typical summer storms.


I think some of these ocean shower/storms can be quite long lived, but do tend to be short lived once/if they cross the coast. This time of year conditions are much better over ocean for storms, with a warmer ocean and cooler land. Compared to spring/summer with warmer land, cooler ocean. Storms may then be reasonably long lived over land but can die quickly once they go out to sea.


As best I can tell trawling through some radar archives the cells Ben shot started with a shower/storm off Smokey Cape at about 10:30am. It then moved mostly north along and slightly west towards the coast until crossing the coast near Balina around 4pm. Activity to the NE then built into the cells I suspect Ben photographed, and eventually crossed the coast near Caboolture and died around 8pm. Plenty of individual cells pulsing along the way, but all are quite closerly linked along the way. With perhaps the crossing at Balina the closest to a break, where one storm cell as it came ashore, and kicked of a new one on an outflow boundary or similar to the NE. The new cell is still touching the edge of the old cell on radar though.

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#1462380 - 22/04/2018 15:38 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
gleno71 Offline
Weatherzone Addict

Registered: 09/11/2007
Posts: 1495
Loc: Australia
Thanks Mike for the explanation , makes sense smile

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#1462389 - 22/04/2018 18:46 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
Seabreeze Offline
Weatherzone Moderator

Registered: 18/09/2005
Posts: 10357
Loc: South West Rocks, NSW
Early morning offshore thunderstorms once again producing reasonably audible thunder on land. A brief afternoon storm developed about 8-10kms west of here.

Photos of thunderstorm development nearshore over a 15 minute period this evening, looking towards Hat Head (you can also see the storm cloud pushing through the pileus between the first and second photos) -




Just had window-shaking thunder from a storm very close-by.
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South West Rocks, NSW Mid North Coast:
June 2018 Rainfall: 95.8mm (June Avg. 139.9mm) // June 2018 Raindays: 8 (June Avg. 10.5 raindays)
Year-to-date Rainfall: 884.6mm (Jan-Jun Avg. 939.2mm) // Year-to-date Raindays: 69 (Jan-Jun Avg. 77.4 raindays)

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#1462391 - 22/04/2018 19:43 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
TWEEDSTORM Offline
Weather Freak

Registered: 08/01/2012
Posts: 739
Loc: Tweed Heads NSW
Great shots seabreeze, lovin' these coastal thunderstorms ,the clouds have been epic and the big rumbles of thunder letting ya know that nature will always be the boss!

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#1462392 - 22/04/2018 19:47 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
DDstorm Offline
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Registered: 13/05/2010
Posts: 239
Loc: Tallai, QLD
To right TS, great shots all but these storms just won't come ashore.
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#1462395 - 22/04/2018 19:59 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
EddyG Offline
Weatherzone Addict

Registered: 19/12/2008
Posts: 4892
Loc: Port Stephens NSW
Thanks Seabreeze and great photos too!! That cell would have been awesome to do a time lapse on.

Speaking of time lapse here is one from Friday evening.
https://youtu.be/cX_E-YPpEGM
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#1462402 - 22/04/2018 20:17 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
Ben Offline
Meteorological Motor Mouth

Registered: 11/10/2002
Posts: 5306
Loc: Tweed Coast
Beautiful shots there Seabreeze!! What lovely structure. Could just imagine that storm at night with a positive CG. Now that would make a ripper shot.

A couple of funnels today in the showers offshore this evening at Cabarita Beach. Didn't want to drop down unfortunately!


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#1462416 - 23/04/2018 06:20 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Ken Kato]
gleno71 Offline
Weatherzone Addict

Registered: 09/11/2007
Posts: 1495
Loc: Australia
Originally Posted By: Ken Kato



The currently forecast positioning of the upper low almost reminds me of a setup we had around a year or two ago where a big upper low sat just inland of the SE QLD coast for days but all it ended up producing was a scattering of showers and some thunderstorms which circulated around it rather than widespread heavy rain despite an onshore flow.



It seems looking at the forecast's that's how its going to play out now, the odd shower here and there. I said a few pages back the BOM were going for up to 15mm this Tuesday (tomorrow) Now its been downgraded to 1mm. As the week progresses, it looks like the winds are going more Southerly and at times from the SW, so any rain activity looks like being offshore. Have a great Monday folks

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#1462417 - 23/04/2018 08:10 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
Mike Hauber Offline
Weatherzone Addict

Registered: 13/07/2007
Posts: 3086
Loc: Buderim
Trough formed further out to sea and upper level low a bit further south than some of the earlier runs so its looking pretty much over now.

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#1462421 - 23/04/2018 11:02 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
Stormwithin Offline
Weather Freak

Registered: 02/12/2016
Posts: 150
Low flow releases from Somerset Dam are planned for the next 48 hours. Wivenhoe lake level rise less than 0.5 m over 48 hours. http://bit.ly/1dPqmtc

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#1462423 - 23/04/2018 11:17 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
Flippy Offline
Cloud Gazer

Registered: 05/12/2017
Posts: 3

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#1462425 - 23/04/2018 14:29 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Flippy]
wetdreams Offline
Weather Freak

Registered: 25/10/2010
Posts: 91
Loc: Mooloolah Valley QLD
Originally Posted By: Flippy


You haven't got any word on what time this super storm with the blanket of hail is coming do you?

I mean, I've been standing here with my toboggan ready to go skiing down the slopes all day, but it's getting pretty hot here with my beanie and scarf on this afternoon... crazy

Perhaps the "newspapers" could ask the he be a little more time specific with his tips of impending doom when they're writing their shock and horror stories. Last time I was left sitting on my front lawn in my blow up boat waiting for the 1 in 500 year flood and my neighbors all laughed at me for days... grin
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#1462429 - 23/04/2018 15:13 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
Seabreeze Offline
Weatherzone Moderator

Registered: 18/09/2005
Posts: 10357
Loc: South West Rocks, NSW
Thanks for the compliments. I noticed the cloud bubbling up while driving about town, thought it might make a nice photo, so popped over to the lighthouse for a better vantage point and was rewarded.

13.2mm in the 24hrs to 9am here, with the majority of that falling during yesterday evening's storm.

The path of the weak low expected to form offshore tonight will determine how much rain ends up falling over the next 48 hours or so along the north coast. There's likely to be a decent amount of rain at sea, but how much of this gets pushed onto coastal parts remains to be seen.
_________________________
South West Rocks, NSW Mid North Coast:
June 2018 Rainfall: 95.8mm (June Avg. 139.9mm) // June 2018 Raindays: 8 (June Avg. 10.5 raindays)
Year-to-date Rainfall: 884.6mm (Jan-Jun Avg. 939.2mm) // Year-to-date Raindays: 69 (Jan-Jun Avg. 77.4 raindays)

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#1462430 - 23/04/2018 15:30 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
Foehn Correspondent Offline
Weather Freak

Registered: 01/11/2001
Posts: 594
Loc: Bardon 4065
A few rumbles of thunder from that cell moving through just west of Brisbane Airport. Only three drops of rain here though.
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#1462431 - 23/04/2018 15:30 Re: SEQ/NENSW Trough & Coastal low with showers/rain and some t'storms - April 20th to 25th 2018 [Re: Blowin']
Whisper Online   content
Weather Freak

Registered: 31/01/2011
Posts: 194
Loc: Gympie
Hey wetdreams

You mean the flood and hail aren't coming after all?

It wouldn't surprise me if the next big event was the neighbours sprinkler being called the first signs of heavy rain haha

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