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Autumn Convection

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martinastro
Martin Mc Kenna
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« on: October 01, 2008, 05:44:22 pm »

Autumn has arrived in style on Oct 1st with very unsettled weather for N. Ireland. There was a convective forecast issued so I decided to head out to image the scenes even though I shouldn't have, I'm currently dying from the cold. I spent from mid day until late afternoon watching the action. No storms fired off because there was a lack of instability and visually, I couldn't see the presence of any wind shear. However the cloud scenes were good enough to justify being out. Non-stop lines of convection passed through all day. At first they were weak but during the afternoon when greatest instability was expected they became more lively. The wind switched from a NWly to a more Nly and things became more severe. I was battered by severe rain, strong squalls, and even hail showers. It was bitterly cold, it felt more like Winter than Autumn. If it had snowed, I wouldn't have been surprised. Plenty of cbs around with wispy anvils and dozens of mammatus displays, the cells really tried but just couldn't produce sparks. Nice white convection and plenty of bows though. Here's a few images.

http://i38.tinypic.com/2jafccp.jpg

Weak cb over the Sperrins. Looking W.

http://i35.tinypic.com/2h7h2wy.jpg

Another cb with anvil

http://i33.tinypic.com/nnur1z.jpg

Rows of cumulus racing in from the N (R to L). The convection was moving very fast today

http://i37.tinypic.com/2ewjmko.jpg

Multicells with anvils and mammatus

http://i34.tinypic.com/2hnrrt2.jpg

Rain and possibly sleet falling from the base

http://i35.tinypic.com/rhoap3.jpg

Vertical shot

http://i37.tinypic.com/wc0hhg.jpg

Flanking tower

http://i34.tinypic.com/2pyqlgh.jpg

Decaying

http://i36.tinypic.com/2nvup07.jpg

Orphan anvil and cu line

http://i33.tinypic.com/f1g5i.jpg

Bow, note the cut off point to the R. It doesn't extend to the ground

http://i35.tinypic.com/2cepyjk.jpg

This is the underside of an approaching gust front. Primary and secondary bows formed in the precip curtain

http://i36.tinypic.com/33z34ba.jpg

http://i33.tinypic.com/v8mnpd.jpg

http://i34.tinypic.com/b5mqfb.jpg

Western side of curved gust front. The outflow was strong with squalls and severe rain of long duration

http://i34.tinypic.com/acz0w.jpg

I headed home after this coughing, shaking from the cold, and quite tired. It's good to see some interesting weather again.

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Roman White
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« Reply #1 on: October 02, 2008, 03:18:48 pm »

Very nice report, Martin! Haven't you seen any snow yet?  Wink 
And I wish you to get rid of that cold as soon as possible! I know how hard it is to do something while being sick.
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martinastro
Martin Mc Kenna
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« Reply #2 on: October 02, 2008, 03:31:49 pm »

Thanks Roman. No snow yet but thanks for the get well wishes  Smiley

Just in from another day of weather action. Some lightning here and powerful gales. Thought I was going to catch a tornado at one stage from a big cell.
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brianb
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« Reply #3 on: October 02, 2008, 03:51:01 pm »

Quote
Just in from another day of weather action. Some lightning here and powerful gales.
Not much unusual here; windy but not quite up to gale force. However the "shower" which has persisted since yesterday morning has finally finished.
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Roman White
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« Reply #4 on: October 02, 2008, 04:37:50 pm »

Just in from another day of weather action. Some lightning here and powerful gales. Thought I was going to catch a tornado at one stage from a big cell.
Not much unusual here; windy but not quite up to gale force. However the "shower" which has persisted since yesterday morning has finally finished.
And I have a different weather now. It is clear at the moment (unbelievable after 2 weeks of 'not so good' weather), and it was +21C today at noon. Warm enough for October!
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martinastro
Martin Mc Kenna
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« Reply #5 on: October 02, 2008, 04:39:57 pm »

It must be more N and W areas that are getting it. Severe weather here all day, and still ongoing. Gales have really picked up. The outflow winds from a huge cb blew the bins up the estate lol. My Mum, who works in Coleraine said they had lightning and nasty thunder. The intense showers seem to be easing now but the winds are picking up. There's a risk of light snow for Scotland tonight.

ESTOFEX didn't predict today's convection (hence no forecast up) but RTE did, and they were correct.
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