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Author Topic: Storm Doris  (Read 2699 times)

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Offline Harry

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Re: Storm Doris
« Reply #15 on: February 23, 2017, 09:56:03 PM »
A couple of articles I found.

Quote

Extreme Weather in United Kingdom on February 23 2017 02:26 PM (UTC).
Storm Doris's strong winds and rain are causing train delays of more than two hours in Cumbria. High winds and a failure in electricity supply are affecting trains across the country, which is having a knock on affect on trains in Cumbria. Trains across the Virgin Trains network are delayed by up to two hours while others are cancelled. Trains are now leaving London Euston but services will be severely disrupted for the rest of the day. A speed restriction because of high winds is in place between Preston and London Euston. Virgin Trains is running an hourly service between Preston and ...
http://hisz.rsoe.hu/alertmap/database/?pageid=event_desc&edis_id=ST-20170223-57255-GBR

Quote

Power Outage in Ireland on February 23 2017 02:16 PM (UTC)
Storm Doris moved in over Ireland in the past 12 hours or so and most people are waking up to extreme winds. Lashing rain and the huge gusts have caused massive power outages as well as knocking trees onto main roads. The storm is expected to surge on for most of the morning.
Affected person(s) 56000
http://hisz.rsoe.hu/alertmap/database/?pageid=event_desc&edis_id=PW-20170223-57253-IRL
« Last Edit: February 23, 2017, 10:03:34 PM by Harry »

Offline teal

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Re: Storm Doris
« Reply #16 on: February 23, 2017, 11:42:43 PM »
  Well it made 56.4 mph @ 14.22.

 teal.

Offline Harry

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Re: Storm Doris
« Reply #17 on: February 24, 2017, 04:51:24 AM »
Quote
Storm Doris left a tragic trail of devastation in its path after battering Britain with winds of almost 100mph, as one woman was confirmed dead and many more were left fighting for their lives. The 29-year-old woman was killed by rotten wood blown off a building by the swirling winds outside a Starbucks coffee shop in Wolverhampton city centre, prompting more than a dozen horrified onlookers to call 999. A girl was left with life-threatening injuries after a ceiling collapsed in a school sports hall in Milton Keynes, while in Aldgate, London, dramatic footage showed a woman receiving ...
http://hisz.rsoe.hu/alertmap/database/?pageid=event_desc&edis_id=ST-20170224-57259-GBR

Offline niko

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Re: Storm Doris
« Reply #18 on: February 24, 2017, 05:00:39 AM »
Nasty one for sure :(  Daily Mail article with pictures.

Bashy

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Re: Storm Doris
« Reply #19 on: February 24, 2017, 05:14:05 AM »
Cheers Martyn, got back live again sometime between 7pm and 1am, i went to bed and woke at about 1 and it was back on

My max speed clocked in at 56.4mph @14:00, not so sure how much more my mast could handle at 6m unguyed....  8O 8)
It may have read a touch faster had it been at the 10m mark but without guylines i dare say the mast and equipment
would be in a carrier bag this morning  :roll:


https://www.youtube.com/watch?v=_iqCeS-DwHc
« Last Edit: February 24, 2017, 07:30:15 AM by Bashy »

Offline broadstairs

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Re: Storm Doris
« Reply #20 on: February 24, 2017, 07:51:17 AM »
I saw a comment from the UKMO yesterday which said that this storm was a result of explosive cyclogenesis, the same effect as happened in California.

Stuart

Bashy

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Re: Storm Doris
« Reply #21 on: February 24, 2017, 07:52:53 AM »
Yeah, i saw that too, mentioned it in my 1st post i think

Offline prodata

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Re: Storm Doris
« Reply #22 on: February 24, 2017, 08:11:48 AM »
My max speed clocked in at 56.4mph @14:00, not so sure how much more my mast could handle at 6m unguyed....  8O 8)

Just for comparison, we saw 56mph (1207) and 60mph (somewhere around 1400 - I forget precisely) at two sites about a mile apart. Both open country and well-exposed but 3m height. So the 10m gust speeds would be estimated at 20-40% higher, depending on exactly how you choose to calculate the correction.
John Dann
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VP Knowledgebase Curator - see http://goo.gl/4p1gYQ

Bashy

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Re: Storm Doris
« Reply #23 on: February 24, 2017, 08:20:16 AM »
Open ground makes the world of difference, i am not overly sheltered here, the wind was coming from the west mostly, this
meant it came straight down between a row of houses and a row of bungalows, prob close to 100m between the rows and
not a great deal in the way, but what is in the way would have impeded the speed for sure, i am prob in a better than average
position for wind in a semi urban environment

With your setups being in open land, would there have been that much difference if they were at 10m opposed the the 3m?

Offline prodata

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Re: Storm Doris
« Reply #24 on: February 24, 2017, 09:07:38 AM »
With your setups being in open land, would there have been that much difference if they were at 10m opposed the the 3m?

As I understand it, yes. The detail is quite complicated and variable and depends on things like the 'roughness' of the terrain as well as - obviously - frictional effects of the ground. But here's one paper I was looking at recently that provides some background as well as one approach to defining a correction formula:

http://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1655&context=abe_eng_pubs

If you look through the met literature then you'll find many other similar papers written over the years, each often differing in detail but the general principle is always the same.
John Dann
www.weatherstations.co.uk - UK Davis specialists
VP Knowledgebase Curator - see http://goo.gl/4p1gYQ

Offline teal

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Re: Storm Doris
« Reply #25 on: February 24, 2017, 10:20:19 AM »
  56.4 mph for me, 56.4 mph for you, & my all time record is also 56.4 mph 23/11/16, that looks a bit strange. A friend of mine just down the road in Diss recorded 67 mph, but that was using a R&D weather station, so there was not a lot of difference in the speed, but it just seems strange that three wind speed all the same.

  teal.   

Offline mcrossley

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Re: Storm Doris
« Reply #26 on: February 24, 2017, 11:51:05 AM »
As I understand it, yes. The detail is quite complicated and variable and depends on things like the 'roughness' of the terrain as well as - obviously - frictional effects of the ground. But here's one paper I was looking at recently that provides some background as well as one approach to defining a correction formula:

http://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1655&context=abe_eng_pubs

If you look through the met literature then you'll find many other similar papers written over the years, each often differing in detail but the general principle is always the same.
I thought any height correction factor only applied to steady wind, all bets are off for gusts as they are caused by turbulent mixing the "potentially laminar-ish" flow anyway, bringing  higher speed airflow down from higher to lower levels.
Mark

Bashy

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Re: Storm Doris
« Reply #27 on: February 24, 2017, 01:29:31 PM »
  56.4 mph for me, 56.4 mph for you, & my all time record is also 56.4 mph 23/11/16, that looks a bit strange. A friend of mine just down the road in Diss recorded 67 mph, but that was using a R&D weather station, so there was not a lot of difference in the speed, but it just seems strange that three wind speed all the same.

  teal.

It does seem a tad strange, but then it could also confirm a true wind speed?

Offline teal

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Re: Storm Doris
« Reply #28 on: February 24, 2017, 02:46:51 PM »
  Poss. I'm not so sure, I'm now thinking something is not right.

  teal. 

Offline niko

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Re: Storm Doris
« Reply #29 on: February 24, 2017, 03:01:44 PM »
  56.4 mph for me, 56.4 mph for you, & my all time record is also 56.4 mph 23/11/16, that looks a bit strange. A friend of mine just down the road in Diss recorded 67 mph, but that was using a R&D weather station, so there was not a lot of difference in the speed, but it just seems strange that three wind speed all the same.

  teal.

Allowing for WD's mph -> knots -> mph conversion that would be 56 mph from the VP2. It would be interesting to know what other values around that speed you see in your logs. My impression is that the VP2 doesn't output all values of wind mph, but I've never had speeds that high to analyze.

 

cumulus