Record number of thunder days

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Record number of thunder days

Postby John Oliver » 2014 Nov 10, 16:16

Five loud rumbles of thunder (distance <2 miles) between 2335 and 2355hrs last night (9th) brought the tally of thunder days this year at Dorchester to 19.
This beats the previous highest annual total (since recording began in 1962) of 18 days set in 1976.

2010 is the only year in the records to be completely thunder-free.

John
Dorchester
south Dorset
John Oliver
 
Posts: 52
Joined: 2012 Feb 04, 09:49

Re: Record number of thunder days

Postby Martin Rowley » 2014 Nov 11, 13:27

... The number of 'thunder heard' days here at West Moors (east Dorset, not far to the north of Hurn) has just reached 25, with a developing cluster of CB/TS grazing the Poole basin coastline early hours 10th.

Because the figure seemed to be getting 'interesting', I tried to work up some sort of statistical background using Hurn published data with which to place this figure in context: the results are (updated to yesterday) here . . .
http://booty.org.uk/images/Hurn_thunderheardanalysis_1973_2003.jpg

Note that there is one year missing from this 1973-2003 dataset and crucially, I'm not sure that Hurn was fully 24/7 towards the end of this period; however, checking against the Met Office gridded dataset and Dorchester figures for the same period, the essential data (means, standard deviations etc.) all look 'sensible'.

25 days is significantly outside the 'normal' envelope of expectations. Looking at other data (not shown), I suggest that we've had the most thundery year for at least four decades.

The breakdown of this year's events into three crude categories is as follows:-

[A] 'Flash-bang-gone' - that is the odd crack and rumble from a quickly passing storm = 10
[B] Extended 'classic' CB activity - several discharges, mix of CC/IC and CG, though latter isolated = 12
[C] Distant (edge of hearing) activity from adjacent clusters = 3

Martin.
Martin Rowley
West Moors, East Dorset [ altitude: 17 m/56' ]
NGR SU 082 023: postcode BH22 0GB
50deg49min15secN, 01deg53min03secW
Martin Rowley
 
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Re: Record number of thunder days

Postby Martin Rowley » 2014 Nov 12, 13:56

Martin Rowley wrote:... The number of 'thunder heard' days here at West Moors (east Dorset, not far to the north of Hurn) has just reached 25 ....


... have now updated for a single 'flash-bang-gone' event this morning (12th November): now 26 days with thunder heard this year and the breakdown now becomes ...

[A] 'Flash-bang-gone' - that is the odd crack and rumble from a quickly passing storm = 11
[B] Extended 'classic' CB activity - several discharges, mix of CC/IC and CG, though latter isolated = 12
[C] Distant (edge of hearing) activity from adjacent clusters = 3

Martin.
Martin Rowley
West Moors, East Dorset [ altitude: 17 m/56' ]
NGR SU 082 023: postcode BH22 0GB
50deg49min15secN, 01deg53min03secW
Martin Rowley
 
Posts: 154
Joined: 2011 Nov 25, 12:54

Re: Record number of thunder days

Postby Graham Easterling » 2014 Nov 12, 14:19

[A] 'Flash-bang-gone' - that is the odd crack and rumble from a quickly passing storm = 10
[B] Extended 'classic' CB activity - several discharges, mix of CC/IC and CG, though latter isolated = 12
[C] Distant (edge of hearing) activity from adjacent clusters = 3


I rather like those categories. I've always thought that reporting days with thunder was a bit too basic, after all hail is divided into 'large' and 'small'. I know that in the COL returns there is space for a description of thunder events, but perhaps a sub-division of thunder days into categories like these would aid subsequent research. I'm seriously considering putting an indicator against each thunder event in my records.

It hasn't been an especially thundery year here, 9 days with thunder so far, the highest I've recorded was 13 in 2006. (A different matter as far as hail is concerned, 20 days in both January & February, my record was 26 for an entire year in 2008).

For Penzance
[A] 'Flash-bang-gone' - that is the odd crack and rumble from a quickly passing storm = 3
[B] Extended 'classic' CB activity - several discharges, mix of CC/IC and CG, though latter isolated = 4
[C] Distant (edge of hearing) activity from adjacent clusters = 4

We did have a particularly spectacular storm in July, photos attached, taken looking across Newlyn harbour towards Penzance.
Attachments
WCornwallLightning170714 (3).jpg
WCornwallLightning170714 (3).jpg (84.14 KiB) Viewed 825 times
WCornwallLightning170714 (2).jpg
WCornwallLightning170714 (2).jpg (78.16 KiB) Viewed 825 times
Graham

Penzance Weather Station
Grid Ref:
SW464231 - Post Code: TR18 4TP
19m AMSL - Aspect SSE
In a SE - NW orientated valley

23 Years of Penzance Weather Records : http://penzanceweather.atspace.com/weather.html
Graham Easterling
 
Posts: 316
Joined: 2011 Nov 30, 20:29
Location: Penzance, Cornwall

Re: Record number of thunder days

Postby Nick Gardner » 2014 Nov 12, 19:41

Thunder days here are now up to 21.

This is highest I've recorded with the previous high being 19 days in 2006.

I have no idea what my ABCs would be; that information has long gone/wasn't recorded!
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalley.co.uk
Nick Gardner
 
Posts: 429
Joined: 2012 Jan 27, 17:25
Location: Rural riverside valley location near the village of Newton Poppleford and 2 km from the sea.


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