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Messages - scottie

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Arctic sea ice / Re: 2020 Sea ice area and extent data
« on: September 08, 2020, 01:05:07 PM »
Their lastest twitter page says the system is now down for "planned system maintenance" which does seem ridiculous at this time ???

Arctic Data archive System (ADS) will be unavailable due to the planned system maintenance.
We are sorry for the inconvenience this may cause.
<Maintenance window>
7 Sep. 2020 at 12:00JST  -  10 Sep. at 12:00 JST

Scottie, check this one out. Here we have a cloud on top of it.

(found in the CAA over the Amundsen Gulf)

Thanks Blumenkraft, this mesoscale low is happening low in the atmosphere and not affecting higher layers. Again occuring close to an ice/open water boundary, I'm thinking that as air moving over sea ice crosses a boundary with open water the lowest layer experieces some warming leading to instability which cause mesolows to form which equalize the temperature differences caused by the ice/open water transition. Again just me thinking out loud following a chain of thought....don't know if it makes any sense...JayW posted this link above. It shows an area of cloud east of Svalbard moving south and passing over an ice/open water boundary, as it does so a number of mesolows form. It also looks like the whole cloud rotates clockwise....possibly conservation of angular momentum at play ????


These mesoscale lows adre actually pretty common, especially if you look at enough RAMMB imagery. Unfortunately, I don't think they are thunderstorms (not to say nT- storms can't happen in the artic), but isee them as nteresting circulations in the mid or lower atmosphere.

Thanks for this, I thought the first image might be a storm because there's a shadow showing the central oval being higher than surrounding cloud but it's a snapshot of a very dynamic process. I've now spotted more similar features forming in the same area. They possibly occur in clusters (?), possibly indicating unstable atmosphere close to the boundary between sea ice and open water (?) - just me thinking out loud but definitely worth looking into. Thanks again  :).

Spotted these cloud formations on Worldview today. First between Svalbard and Franz Josef Land, second between FJL and Novaya Zemlya. I was struck by their small scale "cyclonic" appearance, don't think I've noticed anything like them before. My first thought was thuderstorm, especially the first image. The central structure in each is about 15 - 25 miles across. Just wondering if I'm correct, I'd be grateful for any insight.

*** AGW - the gift that keeps on giving.
Are they Noctilucent clouds? (Right time of day and year, right direction) Lumnekraft says yes.

They are indeed noctilucent (nght shining) clouds and yes they are beautiful. I saw my first for a number of years pre-dawn last week (I live about 50 miles east of London). This year is possibly the best ever for these clouds with sightings as far south as LA, much further south than ever seen before. As well as being increased by AGW they are apparently seeded by meteorites and linked to solar activity, appearing much more numerous at solar minimum which is where we are now. The last time I saw them here was around 11 years ago, which makes sense. More info and photos can be found at

Arctic sea ice / Re: The 2017 melting season
« on: July 04, 2017, 01:46:22 AM »
Hi all, long, long time lurker on the forum. breaking silence when I saw this - large area (10,000+ km2) of sea ice at the western end of the McClure Strait has detached and moved in the general direction of the Beaufort

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