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Chase July 25 2005

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Route:Soest - Gooimeerdijk - Eemmeerdijk - Hoge Vaart - Ganzenweg - Harderbos - Biddinghuizen - Drontermeerdijk - Roggebotsluis - Hoge Vaart
Chasepartner(s):--


CHASE LOG:
A relatively low topped (about 10 kms) supercell crossed the Netherlands from southwest to northeast yesterday. The storm formed near the river Rhine, south of Utrecht and activated over the province of Utrecht. Most likely it died near Meppel, Drenthe.
Over Soest (my hometown) it produced a tornado at about 12.25 LT, which resulted in F0 to possibly F1 damage. My friend and colleague Ben Lankamp did see the tornado and shot several pictures:
Tornado over Soest
Later that day he performed a damage survey and concluded F0-F1 damage:
Damage survey Tornado Soest
I haven't seen the tornado over Soest, but I chased the storm between 12.40 and 14.40 LT. Fortunately it was rather slow moving, so I could chase in the ideal province of Flevoland. I observed multiple rotating wall clouds, sometimes the rotation could be described as violently. Once in a while rotating fractus clouds could be seen all the way down to surface level. I haven't seen any debris clouds, but I'm rather positive I've seen a tornado. One time while driving I saw multiple funnels rotating around a common centre, making it look like a multiple vortex tornado. De wall clouds occluded after about 15 minutes, but new ones formed almost instantly.
A more detailed chase log (in Dutch): Chase Log (in Dutch)

The day after, Meteo Consult mentioned a tornado report near Hasselt on their website. This tornado was produced by the same cell I was chasing, but I aborted the chase about 15 minutes too early :(
Picture tornado Hasselt

The supercell formed in a very moist and slightly unstable air mass. There was some speed shear present and because surface winds were backed, low level directional shear was present as well. LCL's were extremely low and low level lapse rates were rather steep. Furthermore, no convection formed at the southeast side of the storm, so inflow stayed relatively warm. The cell was rather longlived, at least 3 hours, produced at least 3 tornadoes and had multiple meso's. So I think it must have been a cyclic supercell.


PICTURES:


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© 2005 Bernard Hulshof