Synoptic data
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Digital
Atmosphere 12z upper air data (1.3mb) 20050728\upper\05072812_upa.txt |
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Full
15min radar images |
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PDF file (12Mb) of
newspaper clipping etc (suggest right click save as...)
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Wymondham Tornado 15:19z T2 1.75 Mile track
20050728 Wymondham Tornado investigation
Event Date 20050728
Event Time 16:17 -16:22
S.I. conducted 20050804
S.I. by Stuart Robinson
Summary
Confirmed Tornado, Very clear damage track over 1.75 miles – rated T2 (just) due to many large tree sheared off mid way up.
Full report
Some 7 days have elapsed since the event and there has been some significant clear up! However I will state this has been by far the easiest site investigation that I have ever done due to the evidence I have collected.
1.jpg shows slight tree damage to the south of the track.
2.jpg and 3.jpg shows typical tree damage during the majority of the track.
4.jpg shows the northern extent of the damage as it crossed the road
** note ** I did not have my GPS with me on this S.I. so take my track map estimates with a pinch of salt. But I was able to make a good estimate of the track location. I was able to interview Paul Heath who by chance was manning the rail level crossing marked on the map by the blue flag.
Paul’s account and comments
I was aware of a sudden rain storm so I closed all my windows – the rain was incredible at the time. The rain passed and it be came suddenly very warm inside the station (inflow notch?) so I began to open the windows. It was while standing at the door looking south that I saw “a whirlpool” in the clouds. (I showed Paul video of my Harper tornado and he confirmed the cloud rotation was the same as well as the funnel forming beneath)
Suddenly the funnel simply expanded and grew to the ground to my SSW (confirmed by damage to trees in 1.jpg) then tree branches started to become airborne around the tornado, with some falling on the station. The tornado tracked no further than 150 meters from me (confirmed by damage track) and moved to my west and then to my north – It crossed the train track about 550 meters to my north and felled 3 trees which fell across the track , thus blocking the line.
I saw the tornado continue North for about another two minutes before it retracted back in to the clouds. During this time I phoned the next station (north) on the line who also confirmed see the tornado approaching from the south and dissipating just North East.
Note# I showed Paul a number of tornado drawings from the “Storm chaser Manual (Tim Marshall, 1998 USA) and he identified this tornado as “sheathed” tornado – that is a strong single vortex with numerous satellite vortex around it.
When I asked Paul about the timing to the tornado he referred to the station logbook entry that he made at the time..
16:19 – Weather, Tornado crossed line 500 yards north – line closed due to tree fall.
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