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December 2008
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Summary: Nacreous cloud season is underway. The temperature of the polar stratosphere has dropped below -85 C, the threshold for formation of tiny ice crystals that diffract sunlight to produce flamboyant "mother-of-pearl" (nacreous) colors. Icy nacreous clouds are best seen from cold places such as Scandinavia, Iceland and Alaska during the twilight hours after sunset or before sunrise. See also January 2008.
 
  Photographer, Location Images Comments


Ivar Marthinusen,
Trondheim, Norway
Dec. 17, 2008		 #1, #2

These colorful clouds caught my attention today. Although it's been mild in Trondheim lately, it's obviously cold higher up.


Eric Schandall,
Near Lunde, Telemark, Norway
Dec. 24, 2008		 #1, #2, #3, more

There were nacreous clouds after sunset tonight in Telemark, Norway. They lasted for over an hour. They greeted us after coming from Christmas Eve Mass and they were a lovely present for this Season.


Tor E Aslesen,
Oslo, Norway
Dec. 24, 2008		 #1

The cloud was standing out from the background in a very "fluoerscent" way.

Photo details: Nikon D50 2007/12/24 16:09UT Lens: VR 55-200mm F/4-5.6 G Focal Length: 145mm 1/160 sec - F/5.3 ISO 400


Sauli Koski,
Kittila Finland
Dec. 19, 2008		 #1, #2, #3, #4, more

Long time no see, today first nacreous clouds this winter.I could watch them the whole day.

Photo details: Nikon D3, nikon 70-200VR 1/160 f4.0 ISO 200

more images (Dec. 26): from Laura Zagar of Umeå, Sweden; from Jonas Förste of Landfill, Jakobstad, Finland

more images (Dec. 25): from Simon Eskil de Lusua of Vebomark, Sweden