Asperatus?

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John Wilson
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Joined: Sat Dec 12, 2015 8:40 pm
Location: Mapperley Plains, Arnold, Notts.

Asperatus?

Post by John Wilson » Sun Sep 18, 2016 1:54 pm

I witnessed this cloud formation yesterday Saturday 17th September 2016 at 10.15UTC here at Arnold, Nottinghamshire, looking NW. The cloud formation was visible for a couple of hours or so. Are they the 'new' Asperatus type? I would appreciate the views of those with greater knowledge than mine.
Regards to all
John
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asperatus.jpg
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Len Wood
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Location: 1 km from coast in Wembury, SW Devon

Re: Asperatus?

Post by Len Wood » Sun Sep 18, 2016 2:14 pm

Yes John, it looks like asperatus or asperatis as some have called it.
It is a bit controversial because there is a perfectly good name for it already:

mammatus undulatus would fit well into the present WMO classification.
Len
Wembury, SW Devon coast

83 m amsl

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John Wilson
Posts: 13
Joined: Sat Dec 12, 2015 8:40 pm
Location: Mapperley Plains, Arnold, Notts.

Re: Asperatus?

Post by John Wilson » Sun Sep 18, 2016 4:42 pm

Thank you Len. Nice to see something a bit rare or new in this neck of the woods.
All the best
John

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Nicholas Gardner
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Location: Rural riverside valley location near the village of Newton Poppleford and 2 km from the sea.
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Re: Asperatus?

Post by Nicholas Gardner » Sun Sep 18, 2016 7:54 pm

Asperatis cloud I took a photo of a few years back (see attached image):
May6thasperitas.jpg
May6thasperitas.jpg (27.21 KiB) Viewed 2302 times
Otter Valley Weather
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalleyweather.me.uk

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Martin Rowley
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Joined: Sat Dec 12, 2015 8:32 pm
Location: West Moors, East Dorset

Re: Asperatus?

Post by Martin Rowley » Mon Sep 19, 2016 8:11 am

... I wouldn't be calling that cloud (as in original post) as anything other than Sc stratiformis opacus undulatus. Not even mammatus (from that shot - but photos can be notoriously deceptive).

Asperatus/Asperatis has a much more "tortured"/intorted look about it . . . see examples here:-

http://cloudappreciationsociety.org/asp ... nt-page-2/

Martin.
Martin Rowley
West Moors, East Dorset
Lat: 50deg 49.25'N, Long: 01deg 53.05'W
Height (amsl): 17 m (56 feet)
COL category: C1 overall/TRSHEUN=CC-A03-

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