Severe storms 19 Nov - 23rd Nov 2010

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Re: No-vember rain in 2010

Postby von-Kármán » Mon Nov 22, 2010 4:54 pm

Great photo! No it is not an anvil, it is a form of lenticular cloud.

-edit- what Fu-Man Chu said. Essentially the rapidly rising moist air from the cumulonimbus, forces air around it to get displaced upwards in the same way a mountain displaces undersaturated air around it. This causes that undersaturated air to become supersaturated and condense out as a lenticular cloud. They dont last long and typically indicate very rapid development of the cell.
Last edited by von-Kármán on Mon Nov 22, 2010 5:01 pm, edited 1 time in total.

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Re: No-vember rain in 2010

Postby Storm Wolf » Mon Nov 22, 2010 4:56 pm

Fu Manchu wrote:Altocumulus lenticularis
It forms when the air becomes less stable I think. I saw that one and just before that it looked even better :)
Often see it on a developing cell with the air pushing up fast.
My guess is the air is under pressure from beneath and condenses into the lens shape. Then it often dissipates when the Cumulus becomes more like cumulonimbus.

Lert would have a good idea on thta better than me :) Anyone else?


Thanks Fu! I'm learning a lot as I go. Very beginner here. I think I knew more about this stuff when I was ten, which is sad.

Does anyone think there will be any lightning visible from Joondalup a little later? Quickest way is to just ask. :/ There are bloody houses in the way but I can see the tops pretty decently. More is beginning to tower to the south east. Hopefully it'll become very lightning active. There are a lot of red cores on the radar!
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Re: No-vember rain in 2010

Postby Storm Wolf » Mon Nov 22, 2010 5:00 pm

von-Kármán wrote:Great photo! No it is not an anvil, it is a form of lenticular cloud.


Thank you! I told my friend it was a lenticular cloud then saw someone writing 'anvil' on here (likely completely unrelated) and got confused. Thanks guys for clearing that up!
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Re: No-vember rain in 2010

Postby Fu Manchu » Mon Nov 22, 2010 5:05 pm

von-Kármán wrote:Great photo! No it is not an anvil, it is a form of lenticular cloud.

-edit- what Fu-Man Chu said. Essentially the rapidly rising moist air from the cumulonimbus, forces air around it to get displaced upwards in the same way a mountain displaces undersaturated air around it. This causes that undersaturated air to become supersaturated and condense out as a lenticular cloud. They dont last long and typically indicate very rapid development of the cell.


:mrgreen: You so need to be posting here more ;)

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Re: No-vember rain in 2010

Postby Storm Wolf » Mon Nov 22, 2010 5:08 pm

von-Kármán wrote:Great photo! No it is not an anvil, it is a form of lenticular cloud.

-edit- what Fu-Man Chu said. Essentially the rapidly rising moist air from the cumulonimbus, forces air around it to get displaced upwards in the same way a mountain displaces undersaturated air around it. This causes that undersaturated air to become supersaturated and condense out as a lenticular cloud. They dont last long and typically indicate very rapid development of the cell.


Which is good news for thunderstorm enthusiasts, or bad? I find the weather here difficult to 'predict'. In Iowa it's very simple to see what's going on and what's about to happen. I would love for it to magically float over my way, but I guess I am going to have to be patient. Thanks again guys for the explanations!
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Re: No-vember rain in 2010

Postby von-Kármán » Mon Nov 22, 2010 5:12 pm

Last time I was here there seemed to be a lot of silly in fighting, so I left.

Ther are strictly not "altocumulus lenticularis" as these are normally created by a standing wave effect in the lee of a mountain, but it is acually called a "Pileus" cloud ... you typically see them clearly on pyrocumulus clouds, but also on fast rising cells.
http://en.wikipedia.org/wiki/Pileus_(meteorology)

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Re: No-vember rain in 2010

Postby Fu Manchu » Mon Nov 22, 2010 5:16 pm

Not sure about infighting? but anyway thanks for posting :)

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Re: No-vember rain in 2010

Postby Fu Manchu » Mon Nov 22, 2010 5:19 pm


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Re: No-vember rain in 2010

Postby Storm Wolf » Mon Nov 22, 2010 5:20 pm

von-Kármán wrote:Last time I was here there seemed to be a lot of silly in fighting, so I left.

Ther are strictly not "altocumulus lenticularis" as these are normally created by a standing wave effect in the lee of a mountain, but it is acually called a "Pileus" cloud ... you typically see them clearly on pyrocumulus clouds, but also on fast rising cells.
http://en.wikipedia.org/wiki/Pileus_(meteorology)


Fighting? I've never seen that before. I only really frequent this particular forum, though. Those regarding Perth weather. Thanks again for the help and the links, guys. I've definitely learned something today. And I can see the difference. For some reason I always thought of cap clouds on mountains and not huge clouds.

Hoping that as it gets dark, there will be even a BIT of a spark from those clouds. They're distant, but I've seen lightning from more distant storms!
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Re: No-vember rain in 2010

Postby @weather_wa » Mon Nov 22, 2010 5:22 pm

A couple pics from this afternoon:

CRW_1234_stitch.jpg
CRW_1234_stitch.jpg (22.85 KiB) Viewed 8313 times


CRW_1250_stitch.jpg
CRW_1250_stitch.jpg (19.44 KiB) Viewed 8313 times

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Re: No-vember rain in 2010

Postby Tom M (Chaser 80) » Mon Nov 22, 2010 5:22 pm

duh, yep, just caught a quick glimse and came to that conclusion....wrong! lenticular cloud it is, thanx guys:)

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Re: No-vember rain in 2010

Postby Storm Wolf » Mon Nov 22, 2010 5:32 pm

EOS wrote:A couple pics from this afternoon:

CRW_1234_stitch.jpg


CRW_1250_stitch.jpg


Fantastic pictures!!!
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Re: No-vember rain in 2010

Postby @weather_wa » Mon Nov 22, 2010 5:33 pm

Some really nice high cloud formations over my place heading out towards the storms.

Nice line of storms throughout the Goldfields down to Esperance, and a bit more lightning East of Perth out to Merredin.

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Re: No-vember rain in 2010

Postby @weather_wa » Mon Nov 22, 2010 5:38 pm

Severe thunderstorms hit WA but not much rain:

http://www.weatherzone.com.au/news/seve ... rain/15406

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Re: No-vember rain in 2010

Postby Fu Manchu » Mon Nov 22, 2010 5:44 pm

I might split today and yesterday into a separate thread soon. Start one in storm chases I think. There's enough info along those lines in here now :)

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Re: No-vember rain in 2010

Postby Fu Manchu » Mon Nov 22, 2010 5:47 pm

How is this, they have just stayed in the one spot leading off that corner behind Armadale.

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Re: No-vember rain in 2010

Postby Storm Wolf » Mon Nov 22, 2010 5:52 pm

Fu Manchu wrote:How is this, they have just stayed in the one spot leading off that corner behind Armadale.


Yeah; the radar is kind of strange. They look less severe now, but one of them showed red after 'degrading' a little. I've seen storms fade and then suddenly become extremely dangerous again. Black core!
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Re: No-vember rain in 2010

Postby stokesy » Mon Nov 22, 2010 5:57 pm

Been following the discussion as I usually do, great views this arvo over the hills. Really disappointed about the weekend but did get some rain.

EOS wrote:Severe thunderstorms hit WA but not much rain:

http://www.weatherzone.com.au/news/seve ... rain/15406


Quite interesting they say that as the BOM hasn't actually warned of them for this whole event, unless I have missed it somewhere.

Also, even though it's still a fair bit out, have a look at Stormcast for next weekend. Not so much for Perth & CAPE isn't the best but looks awesome.

Sunday morning: http://forecasts.bsch.com.au/tmp/stormc ... _li_wa.png

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Re: No-vember rain in 2010

Postby Fu Manchu » Mon Nov 22, 2010 6:18 pm

Righto Rusted, I guess this puppy will be comin' from over the back of the hill for you so you might not see it?

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Re: No-vember rain in 2010

Postby Fu Manchu » Mon Nov 22, 2010 6:19 pm

Looks to be forming a weakening line of storms now.

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