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Old 2021-09-11, 15:36   #78
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Originally Posted by Uncwilly View Post
Those areas with high counts of twisters, how many above EF-1's do the get? How does that stack up vs "Tornado Alley" in the US of A?
Not well. First of all, the shape is rather inconvenient. And then, the bloody things won't stop moving. It's a nightmare.
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Old 2021-09-11, 16:23   #79
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Not well. First of all, the shape is rather inconvenient. And then, the bloody things won't stop moving. It's a nightmare.
Sounds like a job for Pecos Bill.
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Old 2021-09-12, 01:35   #80
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Quote:
Originally Posted by Uncwilly View Post
Quote:
Originally Posted by Dr Sardonicus View Post
Would you prefer square furlongs per fortnight?
No, I was amused by the whole notion of "tornadoes relative to land area." As long as it's "tornadoes per unit time per unit area" using the same units, the ratio between any two given areas will be the same. I take tornadoes per year per 10000 km2, as in this article, whose headline is, perhaps amusingly (my emphasis),
Quote:
England is tornado capital of the world! More twisters per square mile than other nation
The article says England averages 34 tornadoes per year, or 2.2 (per year) per 10000 km2.

That gave me an area of about 154000 km2, which (after consulting an atlas) appears to be roughly the combined areas of England and Wales.

An average of 34 tornadoes per year is more than a lot of us might expect for the UK - point taken. (It seems most UK tornadoes are weak and of short duration, but they're still tornadoes.)

But look what happens is we apply the idea of "tornadoes per year per 10000 km2 to Pantelleria, which just got hit by a tornado. Its area is 83 km2, so that one tornado gives roughly 120 tornadoes per 10000 km2 per year. Assuming Pantelleria hasn't had any other tornadoes in the last 50 years, over the last 50 years it has it averaged almost as many tornadoes per year per 10000 km2 as the UK; and over the last 25 years, it leaves the UK far behind - just from a single tornado.

Harris County, Texas has averaged about 4 tornadoes per year since 1950. Its area is 1777 mi2 which is about 4600 km2, which gives about 8.7 tornadoes per year per 10000 km2.

The US Deep South seems to be getting more frequent tornadoes in recent years, causing some folks to re-think the idea of a single "Tornado Alley" being a narrow swath of the Central Plains.

Quote:
Those areas with high counts of twisters, how many above EF-1's do the get? How does that stack up vs "Tornado Alley" in the US of A?
I have read in several places that most tornadoes in the UK are quite weak (as tornadoes go) and do not last very long.

I find it difficult to compare the severity of tornadoes in the US and the UK, because the US uses a damage scale, the Enhanced Fujita Scale (F0 - F5) while the UK uses a "pure wind-speed scale," the TORRO tornado severity scale (T0-T11). It seems, however, that with either scale, wind speeds are usually inferred from the damage, since direct measurements are generally not available.

I found conflicting figures for the wind speeds of the July 28, 2005 Birmingham tornado, the strongest in the UK in recent history.
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Old 2021-11-15, 18:14   #81
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As far as I know, this is the first tornado recorded on La Palma. It is the other side of the volcano and about 5km from our place.

https://twitter.com/ElTimeLaPalma/st...67053886042117

Some dramatic videos of lightning have also appeared on the interweb thingy but lightning in volcanic dust clouds is a relatively common phenomenon.
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Old 2021-11-15, 23:55   #82
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Similar vortex over fissure at Kilauea in 2018 may be viewed here.

I suspect the meteorologists classify these things as more like "dust devils" than tornadoes, but still...
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Old 2021-11-16, 01:12   #83
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Quote:
Originally Posted by Dr Sardonicus View Post
I suspect the meteorologists classify these things as more like "dust devils" than tornadoes, but still...
I understand similar phenomenon has been observed on Mars.

But, still...
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Old 2021-11-16, 02:29   #84
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Some indisputably severe-weather related tornadoes (albeit weak for tornadoes) occurred in New England, something of a rarity for this time of year: Rare November tornadoes hit Connecticut, Rhode Island
Quote:
NEW HAVEN, Conn. (AP) - Three tornadoes that hit Rhode Island and southeast Connecticut this weekend were the first since at least 1950 to strike the area in November, the National Weather Service said Sunday.

The service confirmed the three tornadoes touched down Saturday evening. An EF-1 hit near Stonington, and Westerly, Rhode Island; an EF-0 hit in North Kingstown, Rhode Island; and another EF-0 touched down near Plainfield, and Foster, Rhode Island. Representatives from the service were in the region Sunday to investigate damage. No deaths or injuries were reported.

"Since 1950, there has never been a tornado recorded in CT or RI in the month of November," the NWS tweeted. "MA last recorded a November tornado on 11/07/1971."
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