Visiting a museum in Hellevoetsluis several spouttype funnels (probably full blown waterspouts on the 'Brielse Meer) were seen to the Northwest.
In the evening after a walk near the 'Rhoonse Grienden' I saw the beginning of what was to become a long living spouttype funnel. I came closeby on the edge of Spijkenisse.
Below a short video of the chase.
