Flash storage topics [LWN.net]

Flash storage topics

Posted Jun 9, 2018 10:53 UTC (Sat) by anselm (subscriber, #2796)
In reply to: Flash storage topics by karkhaz
Parent article: Flash storage topics

Neither tornadoes nor hurricanes form here

The UK Met Office would beg to disagree on tornadoes:

Around 30 tornadoes a year are reported in the UK. These are typically small and short-lived, but can cause structural damage if they pass over built-up areas.

Hurricanes in a literal sense don't occur in the UK a lot, but sometimes the “tail end” of a hurricane can end up in Britain as a destructive storm, like Hurricane Ophelia in October, 2017.

Given that overhead power lines are fairly common at least in rural areas of the UK, it would not be in the least surprising that storms (including hurricane remnants and tornadoes) caused occasional power outages.

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Flash storage topics

Posted Jun 9, 2018 12:39 UTC (Sat) by mpr22 (subscriber, #60784) [Link] (3 responses)

The UK has the most tornadoes per year of any country in Europe, and more tornadoes per square kilometre per year than any country in the world except the Netherlands. (I think it might even have more tornadoes per square kilometre per year than the region of the USA known as "Tornado Alley".)

Flash storage topics

Posted Jun 9, 2018 13:44 UTC (Sat) by karkhaz (subscriber, #99844) [Link] (2 responses)

Cheers for these facts, I must admit to not knowing them despite enthusiastically following the hurricane season in the US.

One thing that occurs to me, though, is that the sources for "highest number of tornadoes recorded per area" seem to have very population densities (Bangladesh is mentioned often, and the Netherlands and UK have the highest and third-highest densities of all the non-tiny European nations). This may be the reason that the reported numbers are so high for these countries: people are a lot more likely to see a tornado, even if it is too weak to cause significant damage, than in rural Tornado Alley. This is compounded by the fact that tornadoes are difficult to observe directly using radar, so tornado reports mostly come from people who have seen the tornado first-hand. And higher population densities lead to more frequent infrastructure that could suffer from noticeable damage, e.g. power lines, train tracks, etc.

Also I wonder if people being acclimatized to huge tornadoes in Tornado Alley leads to people reporting less of the smaller ones: a relatively benign tornado that would have somebody in the UK scrambling to phone the Met Office might just be ignored by their cousin over the pond.

Flash storage topics

Posted Jun 12, 2018 6:14 UTC (Tue) by k8to (guest, #15413) [Link] (1 responses)

I wonder what the standards are for what qualifies as a tornado.

In the United States northeast growing up, we had a number of minor twisters that no one thought to label "tornado". If it only uprooted 30 trees or so, it was "just a twister".

Flash storage topics

Posted Jun 12, 2018 6:34 UTC (Tue) by mpr22 (subscriber, #60784) [Link]

Wikipedia tells me that to qualify as a tornado, a weather phenomenon must involve a rotating wind column, reaching from ground level to the base of the overhead clouds, with surface wind speeds in excess of 40 mph (64 km/h).