Extreme Dutch Weather: Some interesting stuff 2015

Saturday 25 June 2016

Some interesting stuff 2015

Mostly september showed some interesting convection.

mammatus above Charlois 31-3-2015

this one and below: dying 'left mover'

Whales near Hendrik Ido Ambacht 2/9

Some interesting updrafts eventually don't make it.... 24/8

Slow moving HP SC near Hoogvliet

Little spout on arcus Maasvlakte 2 on 22-9-2015

Nice co occuring rainbouw and spout on 19-9-2015 (Maasvlakte 1)

Some explanation.....

When a thunderstorm has a longer living rotating updraft (mesocyclone) we call it a 'supercell'. A supercell is a relatively rare appearence in Holland; only on a few days a year one or more can be spotted. They can only exist under specific wind conditions. The top of the storm is often not that heigh as that of their bigger brothers in eg. the US. They often bring extreme weather with large hail and even tornado's being possible. A so called 'wallcloud' is a lowering under the stormcloud out of which a tornado can form. The last photo from the 1st of October 2006 shows a wall cloud.

Another type of tornado is not associated with a mesocyclone. It can appear below a stormbase when there are less windy conditions. Although relatively seldom they appear more often than the 'real' tornado. I prefer to call them 'spouts'.

Other weatherphenomena I'm interested in are 'shelfclouds' and 'mammatus' clouds.