In my flickr, there is a wider view of the one posted here. That’s as wide as I have got. My brother had a look too and reckoned there was a better view. I intend on going back and redoing photos in the National Park, I don’t think the residential areas give a complete idea of the type of damage. Apparently the NP between North Turra and St ives is obliterated, so I will venture there. In terms of photos.. that’s pretty difficult as I didn’t really take complete note of every trees direction. But in the residential areas of N Turramurra, a lot of trees were down from W/E or NW/SE direction suggesting straightline. However, in Asquith, and through the NP trees were down in no clear direction. There are trees down randomly over the North Shore too suggesting the possibility of outflow winds of 70-80k/h in the main part of the storm, but the ‘intensive’ damage path is very narrow as shown in the photos over the NP.

Do you by any chance have a more wider view of the track in the forest. I see felling of trees towards the photographer right along the National Park picture. There is only a few pictures that remotely come close to considering tornado damage – all others point to straight line winds at this point. We need you to label each of them where they were taken along the path and the orientation of the images. This is important.

With tornado damage, I like to see some sort of inflow jet roof tile damage, sheeting iron wrapped around power lines ie debris all over the place, garbage bins all over the place even with F0 to F1 damage.

Regards,

Jimmy Deguara

Very interesting in terms of what Michael said. Going by the couplet, and the damage path I plotted the track was about 9km, which is quite long for tornado tracks in Australia. Quite remarkable. The lack of debris is interesting to note, although the streets of Asquith right after the event before cleanup had a lot of debris. In some of my images I ventured into the National Park where the SES had obviously not been yet to try and get an idea of the damage and at times it was quite severe. In the North Turramurra area at least, the damage was actually quite linear in the residential areas more symbolic of straight line winds, bit more varied once you got to the National Park. However, the image of the track through the National Park suggests more tornado.

[img]http://www.extremestorms.com.au/wordpress/wp-content/uploads/d4.jpg[/img]

[img]http://www.extremestorms.com.au/wordpress/wp-content/uploads/d39.jpg[/img]

[img]http://www.extremestorms.com.au/wordpress/wp-content/uploads/d64.jpg[/img]

About 75 images of the damage etc on my flickr account showing most of the photos I took of the damage mostly focused on North Turramurra http://www.flickr.com/photos/28009095@N05/

[img]http://www.extremestorms.com.au/wordpress/wp-content/uploads/d73.jpg[/img]

Regards,

Jimmy Deguara

Thanks for the map and for the estimate in damage. Well done! Hopefully you have noted in your images orientation of tree felling and debris.

Was it supercellular? We require more information from the Bureau on this issue and I will ask Michael Logan at the AMOS meeting tonight at Turrumurra tonight. If it was a tornado, it could have been a gustnado style. One could suggest book end vortex but I don’t see evidence on that within the mess on radar.

Based on the pictures from that link in your last post, it is not consistent with a tornado as evidence on its own. Hopefully your images can provide better evidence. I would have liked to know the orientation/direction of the roof tiles being sheared off. Inflow jets in the Dunoon tornado 2007 sheared off roof tiles. There was also a lot more mess on the ground. Interestingly the small trees are still standing. Was this ‘tornado’ shearing the tops of the trees? Or was this a sudden change in momentum forcing larger trees to be toppled.

I await your images Ben.

Regards,

Jimmy Deguara

I have yet to go through photos etc as I have been away. I will do them later today. However some decent photos including one of the giant 15m gum tree being uprooted in N Turramurra on the local papers website at http://north-shore-times.whereilive.com.au/photos/gallery/easter-storm-damages-north-turramurra/

After work tonight I also drove around in accordance to the doppler images and I tried to get an idea of the damage path. I noticed further damage on Mona Vale road near Forest way, and also up in St Ives chase on the edge of the NP, confined to only one street on its edge. So I have constructed a damage path + estimated fujita ratings in accordance to damage I observed (and as a result, estimated wind speeds). Certainly winds could have been ~150km/h looking at damage, with similar sized trees down to the ones I observed at Belford in January 2010 (when my car got trashed), when it was estimated by damage there by SES of similar wind speeds.

[img]http://www.extremestorms.com.au/wordpress/wp-content/uploads/track.JPG[/img]

Any pictures there Ben?

Regards,

Jimmy Deguara