Delightfully Delirious December (Birak)

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Re: Delightfully Delirious December (Birak)

Postby Fu Manchu » Tue Dec 09, 2014 7:44 am

The wind yesterday was insane.
All bloody day
This morning is lovely though
Wind will be back later


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Re: Delightfully Delirious December (Birak)

Postby Pete » Tue Dec 09, 2014 7:25 pm

Sunset was a cracker last night! Managed to find a spot away from the wind (In the Canning River) to get a shot of the sky at dusk.

Image

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Re: Delightfully Delirious December (Birak)

Postby silvercloud » Tue Dec 09, 2014 9:04 pm

Beautiful pic Pete!!!!

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Re: Delightfully Delirious December (Birak)

Postby Fu Manchu » Thu Dec 11, 2014 6:35 am

Finally saw the wet break in Broome last night.
http://www.oscilmet.com.au/?page=loops. ... 1418250360

A huge relief for locals. Now they can start to love mould

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Re: Delightfully Delirious December (Birak)

Postby Fu Manchu » Thu Dec 11, 2014 6:39 am

Further rainfall expected in the Kimberley today.
Derby can expect 30-50mm

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Re: Delightfully Delirious December (Birak)

Postby Fu Manchu » Sat Dec 13, 2014 10:43 pm

A bit of convection in the Kimberley and becoming persistent. Though the MJO might put the brakes on the convective activity for a bit.

Keep an eye on the sky tonight with a well good meteor shower kicking off

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Re: Delightfully Delirious December (Birak)

Postby Fu Manchu » Sat Dec 13, 2014 10:45 pm

Love the photo Pete :)
Severe Sunset warning was issued that evening

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Re: Delightfully Delirious December (Birak)

Postby Fu Manchu » Sun Dec 14, 2014 6:15 pm

Huge fire near Whitman Park encroaching on homes.
Evacuations happening
http://www.dfes.wa.gov.au/alerts/Pages/ ... emId=11644

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Re: Delightfully Delirious December (Birak)

Postby chartphred » Thu Dec 18, 2014 10:14 pm

Looks like a nice forecast for Christmas day. Warm, but not too hot. Pleasant day for some nice ale! :mrgreen:
But slim chance of thunderies about northern suburbs? Be nice to get a storm on Christmas day... been many years.
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Re: Delightfully Delirious December (Birak)

Postby davo » Fri Dec 19, 2014 1:18 pm

About today, they've extended the possibility of thunderies to the whole metro area in the last forecast. I shall keep an eye to the north...

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Re: Delightfully Delirious December (Birak)

Postby chartphred » Fri Dec 19, 2014 3:44 pm

Probably just covering their backsides with that forecast... just in case. But the typical summer pattern is for storms to build up to the east and continue to move that way. But having said that... all rumbles welcome here!
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Re: Delightfully Delirious December (Birak)

Postby chartphred » Tue Dec 23, 2014 1:43 pm

Interesting post on Reddit recently about Fallstreak holes:
From Wikepedia:
"Such holes are formed when the water temperature in the clouds is below freezing but the water has not frozen yet due to the lack of ice nucleation particles (see supercooled water). When ice crystals do form it will set off a domino effect, due to the Bergeron process, causing the water droplets around the crystals to evaporate: this leaves a large, often circular, hole in the cloud."

I seem to recall someone posting a pic on here recently that was very similar to this? Just wondering if it was the same sort of phenomena?
Attachments
Fallstreak Hole over Wanthaggi.png
Fallstreak Hole over Wanthaggi.png (1.13 MiB) Viewed 13841 times
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Re: Delightfully Delirious December (Birak)

Postby Fu Manchu » Fri Dec 26, 2014 8:54 am

Yes it was the same thing.
That day (in WA) there were a number places they happened.
Wiki doesn't cover all the situations leading to these occurring.

Quite sure the British MetOffice also has info on them.
http://www.metoffice.gov.uk/learning/cl ... treak-hole
http://www.metoffice.gov.uk/learning/le ... ky-weather

NOAA also:
Fallstreaks

What are they?

A fallstreak hole (also known as a "hole punch cloud") is a large circular or elliptical gap that can appear in cirrocumulus or altocumulus clouds.

How do they form?

High to mid level clouds, such as altocumulus, are often composed of tiny water droplets that are much colder than freezing, but have yet to freeze. These "supercooled" water droplets need a "reason" to freeze, which usually comes in the form of ice crystals. Planes passing through the cloud layer can bring these ice crystals.

Once the ice crystals are introduced, the water droplet quickly freeze, grow and start to fall. A hole is left behind, which will start to expand outward as neighboring droplets start to freeze.

http://www.crh.noaa.gov/arx/?n=fallstreaks

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Re: Delightfully Delirious December (Birak)

Postby Fu Manchu » Fri Dec 26, 2014 8:59 am

chartphred wrote:Probably just covering their backsides with that forecast... just in case. But the typical summer pattern is for storms to build up to the east and continue to move that way. But having said that... all rumbles welcome here!



It came close-ish
Some alto cu developed to the North of Metro and North into storms near Lanno which tracked east.

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