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BAA electronic bulletin
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The upper atmospheric conditions that gave rise to the display of stratospheric clouds at the beginning of February look set to return at the end of the month. Last time whilst some of the clouds showed the "nacreous" or "mother-of-pearl" forms, the majority appeared like thin stratocumulus, a normal form of quiet weather cloud. The difference however was that the stratospheric clouds remained relatively bright long after normal stratocumulus would have turned dark at sunset. The clouds might be seen from northern Scotland from February 27, and later from southern England until perhaps March 1. The current forecast weather conditions favour Scotland seeing the clouds before sunrise on February 28, with southern England seeing them after sunset the same day. The rest of the time it may be too cloudy with lower level clouds.
There are plenty of pictures of the clouds on the web, eg http://www.bbc.co.uk/news/in-pictures-35462395 though virtually all these show the spectacularly coloured form, rather than the generally colourless diffuse form.
Jonathan Shanklin
BAS Fellow
British Antarctic Survey, Madingley Road, Cambridge CB3 0ET, England
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BAA-ebulletin mailing list visit:
http://lists.britastro.org/mailman/listinfo/baa-ebulletin
(c) 2016 British Astronomical Association http://www.britastro.org/
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BAA electronic bulletin
======================================================================
The upper atmospheric conditions that gave rise to the display of stratospheric clouds at the beginning of February look set to return at the end of the month. Last time whilst some of the clouds showed the "nacreous" or "mother-of-pearl" forms, the majority appeared like thin stratocumulus, a normal form of quiet weather cloud. The difference however was that the stratospheric clouds remained relatively bright long after normal stratocumulus would have turned dark at sunset. The clouds might be seen from northern Scotland from February 27, and later from southern England until perhaps March 1. The current forecast weather conditions favour Scotland seeing the clouds before sunrise on February 28, with southern England seeing them after sunset the same day. The rest of the time it may be too cloudy with lower level clouds.
There are plenty of pictures of the clouds on the web, eg http://www.bbc.co.uk/news/in-pictures-35462395 though virtually all these show the spectacularly coloured form, rather than the generally colourless diffuse form.
Jonathan Shanklin
BAS Fellow
British Antarctic Survey, Madingley Road, Cambridge CB3 0ET, England
======================================================================
BAA-ebulletin mailing list visit:
http://lists.britastro.org/mailman/listinfo/baa-ebulletin
(c) 2016 British Astronomical Association http://www.britastro.org/
======================================================================
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Good Clear Skies
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Astrocomet
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Colin James Watling
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Various Voluntary work-Litter Picking for Parish Council (Daytime) and also a friend of Kessingland Beach (Watchman)
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Real Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)
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Lyra Main Website: http://www.lyra-astro.co.uk/
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