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#1476289 - 20/11/2018 23:57 SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd
Thunderstruck Offline
Lightning man

Registered: 10/05/2001
Posts: 14972
Loc: Seaford Meadows, SA
Time for a thread here for this one, this will probably be more 'wild' than any of the lows we had over the winter season just gone...

Firstly a weak trough is currently passing over the southern agricultural areas with some brief showers, but these won't amount to much. Further east an aloft a very strong jetstream is present and driving a large cloudband of tropical moisture SE wrapping into the developing low pressure area with thunderstorms over a large swath of the NT/QLD/NSW and VIC.

Tomorrow morning (wednesday) a cold front on the leading edge of the deepening low will move across the agricultural areas with a band of rain, probably reaching the Adelaide area around 9am. Before this, winds will gradually freshen from the NW overnight and into the morning and could be gusty on the arrival of the rain before easing temporarily. The rainband and cold front should clear eastwards after this with the back edge going through the the Adelaide area by about 1130am or so.

Now initially there will be a brief clearance from the subsidence immediately behind the front but a pool of colder air aloft will de-stabilise the atmosphere from the west during the afternoon, reaching the Adelaide area from about 2pm onwards. Showers, heavy at times with isolated cold air thunderstorms (the odd rumble and bolt not frequent lightning) will then occur over a large area of the agricultural areas, especially Southern EP (reaches here from the mid morning), YP, gulf areas, hills, southern mid north and KI. There is also a fair chance of some small hail in the stronger cells as well as very strong wind gusts, especaially later in the afternoon when most unstable air comes through maximised by the strongest wind shear in the lower levels.

The deepening surface low south of KI will have a strong low level jet on its western and NW flank which will wrap up and around towards the gulf areas and KI, YP into wednesday evening. The instability decreases here but moisture increases as do the winds with strong to gale force winds likely with potential for damaging gusts (see Bureau warning). Showers will become more frequent and squally and possibly tend back to rain about the Adelaide Hills with some local heavy falls likely here. The period between about 8pm and 1am will be pretty wild before things begin to ease into thursday morning.

Rainfall generally 10-20mm for many southern ag areas, decreasing to 5-10mm further north and less than 5mm for far northern ag and pastoral areas and also the Riverland. Adelaide should see 15-25mm with isolated 30mm falls possible and the hills 25-50mm with isolated 60-80mm falls not beyond impossible in the known wetter spots.

TS cool

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#1476292 - 21/11/2018 00:29 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Eevo Offline
Weatherzone Addict

Registered: 02/11/2013
Posts: 1671
Loc: Bridgewater
Originally Posted By: Thunderstruck
ills 25-50mm with isolated 60-80mm falls not beyond impossible in the known wetter spots.


im excited!

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#1476297 - 21/11/2018 07:39 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
willitrainagain Offline
Weather Freak

Registered: 13/12/2011
Posts: 586
Loc: Mt Barker S.A.
Impressive sat pic this morning

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#1476307 - 21/11/2018 09:30 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
betsuin Offline
Weather Freak

Registered: 07/04/2010
Posts: 751
Loc: Magill, Adelaide
Nice looking band on the radar:


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#1476309 - 21/11/2018 09:36 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Ricky Offline
Weatherzone Addict

Registered: 21/09/2003
Posts: 1580
Loc: West Richmond
Very pretty


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#1476312 - 21/11/2018 10:01 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
red earth Offline
Weather Freak

Registered: 21/12/2007
Posts: 378
Loc: Lockleys, Adelaide
Originally Posted By: Thunderstruck



Tomorrow morning (wednesday) a cold front on the leading edge of the deepening low will move across the agricultural areas with a band of rain, probably reaching the Adelaide area around 9am.
TS cool


Spot on. The rainband struck here at Lockleys just on 930am.

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#1476313 - 21/11/2018 10:12 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Bergasms Offline
Weather Freak

Registered: 04/08/2010
Posts: 366
Loc: South Plympton, Adelaide, Aus
Huey just sent it down in the CBD. Heavier than a sunday turd after a night on the pale ale.
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I wish Mt Lofty was more lofty, another 2km or so would suffice.

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#1476326 - 21/11/2018 12:23 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
betsuin Offline
Weather Freak

Registered: 07/04/2010
Posts: 751
Loc: Magill, Adelaide
Wonder how much if any of that wrap around will get here?
6mm from this morning.

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#1476328 - 21/11/2018 13:05 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Markus Offline
Weatherzone Moderator

Registered: 02/12/2010
Posts: 2231
Loc: Clare, SA
Thanks Lennie for making the thread.

8.5mm so far in Clare, pretty damn heavy rainband.

Adelaide right in the crosshairs for some very strong gusts this evening. Take heed, could be blackouts from falling branches and low visibility in the heavy showers so driving will be treacherous. Expecting some very solid hail showers later on today also and local thunder. 100km+ gusts possible along the coasts and over quite an extended period. The ocean will be churned right up.
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http://markdawsonphoto.wordpress.com/

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#1476331 - 21/11/2018 13:25 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Thunderstruck Offline
Lightning man

Registered: 10/05/2001
Posts: 14972
Loc: Seaford Meadows, SA
Managed 10mm from the cold front, leading edge was well marked by a line of convective showers typical of stronger cold fronts.

Brutal wind to follow tonight, be strong gales out on the water, possibly storm force around areas west of KI later.

TS cool

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#1476335 - 21/11/2018 13:58 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
StormCapture Offline
Weatherzone Addict

Registered: 19/12/2013
Posts: 1701
Loc: Uleybury
Noticable gusts occurring now

Neptune Island 115km/h
Hindmarsh Island 107km/h
Plenty of 70-90s around the place.

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#1476337 - 21/11/2018 14:07 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Eevo Offline
Weatherzone Addict

Registered: 02/11/2013
Posts: 1671
Loc: Bridgewater
it is safe to come out yet?

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#1476341 - 21/11/2018 14:46 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Markus Offline
Weatherzone Moderator

Registered: 02/12/2010
Posts: 2231
Loc: Clare, SA
Casual 132km gust at Neptune Island. BoM still has the warning as 90-100km. Asleep at the wheel much, they need to upgrade it to destructive, even if it is only isolated coastlines getting destructive winds ( thus far).
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http://markdawsonphoto.wordpress.com/

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#1476344 - 21/11/2018 15:27 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
saltspray Offline
Weather Freak

Registered: 26/05/2007
Posts: 120
Loc: West Lakes Shore SA
2 showers. 2 horizontals. 2 with hail. Woohooo.

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#1476346 - 21/11/2018 15:35 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Eevo Offline
Weatherzone Addict

Registered: 02/11/2013
Posts: 1671
Loc: Bridgewater
that was awesome!

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#1476353 - 21/11/2018 16:17 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
betsuin Offline
Weather Freak

Registered: 07/04/2010
Posts: 751
Loc: Magill, Adelaide
Great looking swirl!



Edited by betsuin (21/11/2018 16:17)

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#1476355 - 21/11/2018 16:35 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
jack63 Offline
Weather Freak

Registered: 28/02/2010
Posts: 270
Loc: Mt Barker, Adelaide Hills
Good hailstorm in Mount Barker with a good clap of thunder as an added bonus.

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#1476383 - 21/11/2018 19:22 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Markus Offline
Weatherzone Moderator

Registered: 02/12/2010
Posts: 2231
Loc: Clare, SA
Have seen 5 hail showers so far up here today, unfortunately all were short lived and mixed with rain. Seems atmosphere is too saturated for any real heavy hail showers, although that storm to the nw of here earlier looked pretty solid. Liking the look if that line in y.p. currently.
_________________________
My Blogging site.

http://markdawsonphoto.wordpress.com/

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#1476386 - 21/11/2018 19:26 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
Eevo Offline
Weatherzone Addict

Registered: 02/11/2013
Posts: 1671
Loc: Bridgewater
18mm of rain.
very nice.

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#1476394 - 21/11/2018 20:16 Re: SA Deep low, windy with showers, small hail, cold air thunder Nov 21st-22nd [Re: Thunderstruck]
willitrainagain Offline
Weather Freak

Registered: 13/12/2011
Posts: 586
Loc: Mt Barker S.A.
Cyclonic like now

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