Thanx guys...

So presumably we've got tropical cyclones (hurricanes, typhoons, etc), sub
tropical cyclones, extratropical cyclones (which presumably may or not be
the two previous) and mid-latitude cyclones (depressions which may or may
not be formed from the three previous or have absorbed the three
previous) -- argh. Better'd do some reading.

Les
Les Crossan,
Wallsend, Tyne & Wear 55N 01-30W,
Home of the Wallsend Stormcam - http://www.uksevereweather.org.uk



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For an up to date review of extratropical transition see-
http://www.meteo.physik.uni-muenchen...h/etpaper.html
The Extratropical Transition of Tropical Cyclones: Forecast Challenges, Current Understanding and
Future Directions
by
Sarah C. Jones, Patrick A. Harr, Jim Abraham, Lance F. Bosart, Peter J. Bowyer, Jenni L. Evans,
Deborah E. Hanley, Barry N. Hanstrum, Robert E. Hart, Francois Lalaurette, Mark R. Sinclair, Roger
K. Smith, and Chris Thorncroft.
Weather and Forecasting, in press

--
regards,
david

On Sat, 27 Sep 2003 08:48:37 GMT, Les Crossan in
wrote:

So presumably we've got tropical cyclones (hurricanes, typhoons, etc), sub
tropical cyclones, extratropical cyclones (which presumably may or not be
the two previous) and mid-latitude cyclones (depressions which may or may
not be formed from the three previous or have absorbed the three
previous) -- argh. Better'd do some reading

Hi Les

The only thing I'd add to that is usually the terms "extratropical cyclone"
and "mid-latitude cyclone" are referring to the same feature - a
depression. It is a pity our subject seems to have *so* many names for the
same features. The "extra" bit merely implies it is outside the tropics as
we are here in temperate (mid) latitudes.

--
Mike posted to uk.sci.weather 27/09/2003 09:14:34 UTC
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So presumably we've got tropical cyclones (hurricanes, typhoons, etc), sub
tropical cyclones, extratropical cyclones (which presumably may or not be
the two previous) and mid-latitude cyclones (depressions which may or may
not be formed from the three previous or have absorbed the three
previous) -- argh. Better'd do some reading.

....and just to throw in a bit more you've got the Polar Low,sometimes called an 'Arctic Hurricane'
(can sport an eye feature),probably classifiable as a 'mesoscale extratropical cyclone',but have
been called 'polar mesocyclones'.
then there's 'sub tropical mesoscale extratropical cyclone' eg 'Mediterranean Hurricanes',

--
regards,
david

ooerrr... what have I started (:

Aren't Polar Lows MISOcyclones?

Les

--
Les Crossan,
Wallsend, Tyne & Wear 55N 01-30W,
Home of the Wallsend Stormcam - http://www.uksevereweather.org.uk

"Waghorn" wrote in message
...
So presumably we've got tropical cyclones (hurricanes, typhoons, etc),
sub
tropical cyclones, extratropical cyclones (which presumably may or not be
the two previous) and mid-latitude cyclones (depressions which may or may
not be formed from the three previous or have absorbed the three
previous) -- argh. Better'd do some reading.

...and just to throw in a bit more you've got the Polar Low,sometimes
called an 'Arctic Hurricane'
(can sport an eye feature),probably classifiable as a 'mesoscale
extratropical cyclone',but have
been called 'polar mesocyclones'.
then there's 'sub tropical mesoscale extratropical cyclone' eg
'Mediterranean Hurricanes',

--
regards,
david






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ooerrr... what have I started (:

Aren't Polar Lows MISOcyclones?

Les
:-),er... no... this is where I think the term meso- may cause confusion,with miso and meso cyclone
refering to circulations in severe local storms eg Supercells.I think Polar lows should be called
mesoSCALE cyclones.
An early paper that tried to clarify the 'scale' problem,tho I think this lead to some controversy
at the time
Orlanski, I., 1975: A rational subdivision of scales for atmospheric processes. Bulletin of the
American Meteorological Society, 56(5), 527-530.
Abstract / PDF
http://www.gfdl.noaa.gov/~gth/netscape/1975/io7501.pdf
at
http://www.gfdl.gov/~gth/netscape/authors/orlanski.html
From my potted reading there appears to have been some confusion re the classification of mesoscale
cyclones,polar lows,secondary lows,comma cloud lows etc as dynamicists in the late 80s and early
90s tried to reconcile what was coming from new computer simulations with satellite imagery and
observations.The legacy of this seems to be some ongoing lack of clarity in the terminology,even if
everybody knows what they are talking about now,

--
regards,
david

thanx waghorn. I'm going to take a stress pill and chill out...

(argh)

Les

--
Les Crossan,
Wallsend, Tyne & Wear 55N 01-30W,
Home of the Wallsend Stormcam - http://www.uksevereweather.org.uk

"Waghorn" wrote in message
...
ooerrr... what have I started (:

Aren't Polar Lows MISOcyclones?

Les
:-),er... no... this is where I think the term meso- may cause
confusion,with miso and meso cyclone
refering to circulations in severe local storms eg Supercells.I think
Polar lows should be called
mesoSCALE cyclones.
An early paper that tried to clarify the 'scale' problem,tho I think this
lead to some controversy
at the time
Orlanski, I., 1975: A rational subdivision of scales for atmospheric
processes. Bulletin of the
American Meteorological Society, 56(5), 527-530.
Abstract / PDF
http://www.gfdl.noaa.gov/~gth/netscape/1975/io7501.pdf
at
http://www.gfdl.gov/~gth/netscape/authors/orlanski.html
From my potted reading there appears to have been some confusion re the
classification of mesoscale
cyclones,polar lows,secondary lows,comma cloud lows etc as dynamicists in
the late 80s and early
90s tried to reconcile what was coming from new computer simulations with
satellite imagery and
observations.The legacy of this seems to be some ongoing lack of clarity
in the terminology,even if
everybody knows what they are talking about now,

--
regards,
david








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