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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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#1
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http://www.bbc.co.uk/news/world-europe-24996292
That's a new one ! Keith (Southend) http://www.southendweather.net "Weather Home & Abroad" |
#3
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On 19 Nov 2013 08:56:12 GMT
"Norman" wrote: wrote: http://www.bbc.co.uk/news/world-europe-24996292 That's a new one ! Keith (Southend) http://www.southendweather.net "Weather Home & Abroad" I haven't been following this one carefully but, from what I have seen, I think the event was a fairly straightforward cut-off low. These happen from time to time in the Mediterranean. I'm not sure if use of the word "cyclone" is intended to imply a tropical type of event or if it is used merely as an alternative to "depression". Although tropical-type systems do occur in the Mediterranean on rare occasions I don't think this was one of them but, as I say, I haven't been following it closely so I am open to correction if I am wrong. A fairly good reference to tropical-type lows in the Mediterranean can be found at http://en.wikipedia.org/wiki/User:At...opical_cyclone The event of Jan 1995 was particularly interesting. Current one is nothing like a tropical storm. A quick dash through the satellite pictures suggest it's a trough (instant occlusion?) linked to frontal wave to the south that has caused the trouble. The 1995 example is said to be a probable polar low and, given a sea temperature of 16C, I don't think it qualifies as a tropical storm. The first I saw of these Mediterranean 'tropical' storms on satellite pictures was probably that for September '69. It was a storm that moved north from Africa and over the warm sea developed into what looked like a full-blown hurricane. As well as a well-defined eye it had an outflow of cirrus, which was strongest to the north. I recall that Malta suffered the most from this 'Medicane'. -- Graham P Davis, Bracknell, Berks. Mail: 'newsman' not 'newsboy'. 'Don't let old age put you off starting complicated jigsaws. If you don't finish, it will give guests something fun to do at your funeral.' - Bridget&Joan's Diary. |
#4
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Graham P Davis wrote:
On 19 Nov 2013 08:56:12 GMT "Norman" wrote: wrote: http://www.bbc.co.uk/news/world-europe-24996292 That's a new one ! Keith (Southend) http://www.southendweather.net "Weather Home & Abroad" I haven't been following this one carefully but, from what I have seen, I think the event was a fairly straightforward cut-off low. These happen from time to time in the Mediterranean. I'm not sure if use of the word "cyclone" is intended to imply a tropical type of event or if it is used merely as an alternative to "depression". Although tropical-type systems do occur in the Mediterranean on rare occasions I don't think this was one of them but, as I say, I haven't been following it closely so I am open to correction if I am wrong. A fairly good reference to tropical-type lows in the Mediterranean can be found at http://en.wikipedia.org/wiki/User:At...opical_cyclone The event of Jan 1995 was particularly interesting. Current one is nothing like a tropical storm. A quick dash through the satellite pictures suggest it's a trough (instant occlusion?) linked to frontal wave to the south that has caused the trouble. The 1995 example is said to be a probable polar low and, given a sea temperature of 16C, I don't think it qualifies as a tropical storm. I think the jury is still out on the Jan 1995 event. Certainly there are similarities to a polar low but there are also difference. These "Medicane" events do seem to develop from cold-cored cut-off lows. However, they have much deeper convection around the centre than is normally found in a polar low. With time, the latent heat released in this deep convection seems to result in a relatively small warm core developing, something that isn't found in a polar low. It is this warm core development that transforms the feature into something closely related to a tropical cyclone. This paper by Kerry Emanuel is worth a read http://hal.archives-ouvertes.fr/docs...2-217-2005.pdf Some notes on the Jan 1995 event, prepared by Jack Beven, one of the forecasters at the National Hurricane Center, can be found at http://www.mindspring.com/~jbeven/intr0008.htm It seems that these events in the Mediterranean do not fit comfortably into any of the common definitions. The indtroduction of a separate category of "Medicane" is therefore probably quite appropriate. -- Norman Lynagh Tideswell, Derbyshire 303m a.s.l. |
#5
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I thought I would just chip in with a quick blog and plotted chart:
http://xmetman.wordpress.com/2013/11...-january-1995/ |
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