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This one?
http://www.lightningmaps.org/?lang=en#y=53.2648;x=-4.8611;z=6;t=3;m=sat;r=0;s=0;o=0;b=;n=0;d=2;dl=2;dc=0;
Originally Posted by: Arcus
Thanks. I've been using that site but I thought it was a different one as those options don't display in chrome. But when I just clicked your link in firefox its back to how I knew it! I will use firefox from now on. Thanks again.
I suspect it altocumulonimbus; i.e., the high base cumulonimbus that develop from altocumulus castellanus clouds. As you've said, it's likely due to convergence line from an old weak occlusion advancing from the SW, plus downdrafts from earlier storms over NE France and belgium.
Originally Posted by: ozone_aurora
Ive never heard of altocumlonimbus and can't find it on google, what is it?
We had clear as day castellanus this morning, but now it's just milky with varying shades of cream & grey.
Originally Posted by: picturesareme
It's an unofficial term for cumulonimbus that arise from altocumulus castellanus clouds rather than those ordinary cumulus clouds that you typically see building over hot land in the afternoon or over sea when cold, cyclonic airmass is over it. These have higher cloud bases than normal storms, sometimes over 3000 m. They develop from overheated lower troposphere or a when tongue of hot lower atmosphere drives into cold upper layers, especially at convergence zones. Having said that, ordinary cumulonimbus do co-exist with altocumulonimbus, often leading to MCSs.
I found it in French Wikipedia, which I think makes interesting reading,
https://fr.wikipedia.org/wiki/Altocumulonimbus,
See also,
https://fr.wikipedia.org/wiki/Altocumulus_castellanus.
For some reason, this medium level storms/altocumulonimbus stuff is very rarely mentioned in the English Internet world; you'll be very lucky to find it on google, and this is all you'll find on English Wikipedia, https://en.wikipedia.org/wiki/Altocumulus_castellanus_cloud.
T/storm. Overhead crack of thunder sent dog scurrying.
max rr/hr 143.5mm, 5.8mm rising quickly, temp 22.0c
Edit: rain has passed, 11.2mm, still lightning & thunder though, round 2?
Edit: Round 2 underway. Storm virtually overhead, torrential rain, up to 16.0mm.
A real beauty approaching Folkestone from the Channel - are you watching IDJ?
Originally Posted by: Jive Buddy
Well I can confirm that the little clutch running up across Surrey and South London now are vicious noisy little buffers. Lots of CG and torrential rain in the core. Proper summer storm! 🙂
Originally Posted by: eddied
Yes some very heavy rain here next door to the Shard, and lots of flashes and bangs.
Suddenly thundery and started raining here - quite a small cell overhead.You could see convergence of cooler sea air and hot Vale of York air right above us.
been thundering here for the last 30 mins. getting closer and almost constant. ..
Flooding reported from my old stomping ground Caterham. Kenley airfield, a meto site, reporting 39.6mm between 14.00 - 15.00
Big drops of rain and CG lightning and very frequent to my south west.
DeeDee it looks like it may track your west...
Originally Posted by: RUBBERDUCK
certainly very vicious thunder, but still dry here so far ......