I am getting SDS treatment right now

[Tarmo Tanilsoo]

A cumulonimbus cloud has appeared from out of nowhere over Laguja village. I have it on my weather cam. It has been hazy all day. This is not a thunderstorm.

More after this cloud passes. I am shooting it with my webcam right now.

 

[Jeff Miller]

A cumulonimbus cloud has appeared from out of nowhere over Laguja village. I have it on my weather cam. It has been hazy all day. This is not a thunderstorm.

More after this cloud passes. I am shooting it with my webcam right now.

Technically, a cumulonimbus cloud is indicative of a thunderstorm event. Are you certain this is not producing lightning? If it appeared out of nowhere it is indicative of a strong cap hat has been broken - would like to see some screenshots of this cloud.

 

[David Wolfson]

Not to make a big thing about this, but I'm quite sure Tarmo is entitled to call a non-lightning producing cloud of suitable characteristics a cumulonimbus. While some popular sources equate them with thunderstorms, the most authoritative definition I found (from the AMS glossary) doesn't do that http://amsglossary.allenpress.com/glossary/search?p=1&query=cumulonimbus&submit=Search

Glad you're getting some action, Tarmo! Dynamics are looking up in the states as well.

 

[Jeff Miller]

I am certainly not doubting Tarmo's report as I am not there... I have a genuine interest in seeing this and just am curious how he is certain it is not a thunderstorm.

I've always been a structure fanatic and would love to see a shot of this feature.

 

[Tarmo Tanilsoo]

I have a posted a page about this event on my weather site. If link doesn't open, try again - that's just my host. Note: I started shooting when the cloud was overhead.

Well, I don't know what to think. I hardly remember such case like today. At times, I saw enhanced cumulus parts of these clouds, but now it seems to be calm again. Clouds are really, really strange. I attached a radar image from Latvian local weather service when this happened. I am in southwestern Estonia at 58.16°N 26.45°E. Radar is indicating indeed some rain. You can watch Latvian weather radar here (Estonia does not provide it for free)

Edit: Something appears to be going on. 1615Z Satellite report indicated CB clouds over southern Estonia.