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-   -   Tornado swatch. (https://www.mersenneforum.org/showthread.php?t=10457)

masser 2021-09-11 15:36

[QUOTE=Uncwilly;587711]
Those areas with high counts of twisters, how many above EF-1's do the get? How does that [B]stack up[/B] vs "Tornado Alley" in the US of A?[/QUOTE]

Not well. First of all, the shape is rather inconvenient. And then, the bloody things won't stop moving. It's a nightmare.

kriesel 2021-09-11 16:23

[QUOTE=masser;587712]Not well. First of all, the shape is rather inconvenient. And then, the bloody things won't stop moving. It's a nightmare.[/QUOTE]
Sounds like a job for [URL="https://en.wikipedia.org/wiki/Pecos_Bill"]Pecos Bill[/URL].

Dr Sardonicus 2021-09-12 01:35

[QUOTE=Uncwilly;587711][QUOTE=Dr Sardonicus;587699]:rofl:[/QUOTE]Would you prefer square furlongs per fortnight?[/quote]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 km[sup]2[/sup], as in [url=https://www.dailymail.co.uk/sciencetech/article-3124716/Britain-s-Tornado-Alley-revealed-Home-Counties-Bristol-Birmingham-risk-twisters.html]this article[/url], whose headline is, perhaps amusingly (my emphasis), [quote]England is tornado capital of the world! More twisters [b]per square mile[/b] than other nation[/quote] The article says England averages 34 tornadoes per year, or 2.2 (per year) per 10000 km[sup]2[/sup].

That gave me an area of about 154000 km[sup]2[/sup], 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 km[sup]2[/sup] to Pantelleria, which just got hit by a tornado. Its area is 83 km[sup]2[/sup], so that one tornado gives roughly 120 tornadoes per 10000 km[sup]2[/sup] 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 km[sup]2[/sup] 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 mi[sup]2[/sup] which is about 4600 km[sup]2[/sup], which gives about 8.7 tornadoes per year per 10000 km[sup]2[/sup].

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?[/QUOTE]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 [url=https://www.bbc.com/news/uk-england-birmingham-53498921]July 28, 2005 Birmingham tornado[/url], the strongest in the UK in recent history.

xilman 2021-11-15 18:14

Close to home ...
 
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.

[url]https://twitter.com/ElTimeLaPalma/status/1460267053886042117[/url]

Some dramatic videos of lightning have also appeared on the interweb thingy but lightning in volcanic dust clouds is a relatively common phenomenon.

Dr Sardonicus 2021-11-15 23:55

Similar vortex over fissure at Kilauea in 2018 may be viewed [url=https://twitter.com/AnthonyQuintano/status/1001987944897564672]here[/url].

I suspect the meteorologists classify these things as more like "dust devils" than tornadoes, but still...

chalsall 2021-11-16 01:12

[QUOTE=Dr Sardonicus;593195]I suspect the meteorologists classify these things as more like "dust devils" than tornadoes, but still...[/QUOTE]

I understand similar phenomenon has been observed on Mars.

But, still...

Dr Sardonicus 2021-11-16 02:29

Meanwhile, back on Planet Earth...
 
Some indisputably severe-weather related tornadoes (albeit weak for tornadoes) occurred in New England, something of a rarity for this time of year: [url=https://apnews.com/article/connecticut-new-haven-tornadoes-storms-weather-020792157476012e3221d739ee67967d=]Rare November tornadoes hit Connecticut, Rhode Island[/url][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."[/quote]

Uncwilly 2021-12-11 15:49

Big storm system in the area covering parts of Arkansas, Missouri, Kentucky, and Illinois
[URL="https://www.npr.org/2021/12/11/1063335433/dozens-are-feared-dead-as-tornadoes-hit-midwestern-and-southern-u-s"]https://www.npr.org/2021/12/11/1063335433/dozens-are-feared-dead-as-tornadoes-hit-midwestern-and-southern-u-s [/URL]

Dr Sardonicus 2021-12-11 17:22

1 Attachment(s)
[QUOTE=Uncwilly;594985]Big storm system in the area covering parts of Arkansas, Missouri, Kentucky, and Illinois
[URL="https://www.npr.org/2021/12/11/1063335433/dozens-are-feared-dead-as-tornadoes-hit-midwestern-and-southern-u-s"]https://www.npr.org/2021/12/11/1063335433/dozens-are-feared-dead-as-tornadoes-hit-midwestern-and-southern-u-s [/URL][/QUOTE]The tornado that went through Mayfield, KY had a [i]very[/i] long track - over 200 miles. I can't quite tell from the picture, but this may a [i]four[/i]-state tornado. It definitely went through the boot heel of MO, the NW corner of TN, and a long way through KY. But it may have started in AR. (Picture of "Four Likely Tornado Tracks" from the Kentucky Division of Emergency Management)

Uncwilly 2021-12-11 18:01

The one near St Louis also destroyed an Amazon warehouse in Illinois. I know someone that lives in the town where it was.

Dr Sardonicus 2021-12-13 02:48

I've read reports that there are at least 6 confirmed dead at the Amazon warehouse in Edwardsville.

I'm confused by reports out of Mayfield, KY about the candle factory. Early today, I read reports of 110 inside at the time, 40 rescued and 40 unaccounted for. Yesterday morning I read a report that said the county coroner had conformed 18 dead.

But the 18 might have been for the county. Today I read reports of 8 confirmed dead and 8 still unaccounted for at the candle factory, but no reports about more people being pulled from the wreckage.

It seems that there was a work-release crew from the Graves County Jail working at the candle factory. All survived, and some helped in the rescue effort. However, one inmate who was injured apparently walked away after being treated in a hospital. Also, the corrections officer who had been supervising the work-release crew was killed.

I read reports that the tornado that struck Mayfield carried debris 30,000 feet into the air. Also that the length of the track may be a new record, over 220 miles.


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