Very stormy period coming up

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cordyman
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Re: Very stormy period coming up

Post by cordyman » Sat Feb 01, 2014 11:23 pm

Dave Brown wrote: as solar input outweighs radiation cooling from 19th January onward, any cold spells are unlikely to be 'killing cold'.







great info on the solar input!! icon_salut icon_salut icon_salut in the clear I reckon icon_thumleft

Stripped Trachycarpus looks great by the way!


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stephenprudence
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Re: Very stormy period coming up

Post by stephenprudence » Sat Feb 01, 2014 11:35 pm

I got -4.5C in March last year then -4.1C in early April... you're never in the clear until Mid-April.
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USDA equivalent average temperature zone: 9a/RHS zone 3
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2007: -0.1C, 2008: -4.2C, 2009: -5.7C, 2010: -10.5 (record), 2011: -4.9C, 2012: -5.3, 2013: -4.5C (so far)


Tom2006
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Re: Very stormy period coming up

Post by Tom2006 » Sun Feb 02, 2014 7:43 am

I got -6c in May one night a few years back I think it was 2010. But like Dave says its unlikely to kill the plants just damage all the new growth.
Most wanted list - Any Young Trachycarpus and/or fern.


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cordyman
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Re: Very stormy period coming up

Post by cordyman » Sun Feb 02, 2014 7:48 am

stephenprudence wrote:I got -4.5C in March last year then -4.1C in early April... you're never in the clear until Mid-April.
What were the resultant daytime highs? And the following nights lows? That's chilly in April :lol:


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leunerj
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Re: Very stormy period coming up

Post by leunerj » Sun Feb 02, 2014 10:14 am

Dave Brown wrote: I went up a ladder and started stripping this morning, but butty'ell it was cold
What did you expect taking all your clothes off at the top of a ladder? :lol:
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Re: Very stormy period coming up

Post by Dave Brown » Sun Feb 02, 2014 10:20 am

The reason we get the coldest weather in Feb, is we are far more likely to have blocking easterlies than in Dec or Jan. Although the hemisphere has started to warm, there is still a lot of cold about, and we are more likely to experience it.

Also we are far less likely to have Icedays the further into Feb we go, and the strength is returning to the sun, the shadows shorter so any plant warmed during the day can take cooler conditions at night without freezing through.

I used to go down to Architectural Plants at the famous frost pocket Nuthurst Nursery which saw -19.2C in 1991, and spend an hour, or as long as I could, talking to Angus White. He said he always removed protection on Feb 16th as there was never 'killing cold' after that date.
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Dave Brown
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Re: Very stormy period coming up

Post by Dave Brown » Sun Feb 02, 2014 10:23 am

leunerj wrote:
Dave Brown wrote: I went up a ladder and started stripping this morning, but butty'ell it was cold
What did you expect taking all your clothes off at the top of a ladder? :lol:
The Trachycarpus was not too impressed either :lol:
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Re: Very stormy period coming up

Post by Nigel » Sun Feb 02, 2014 12:21 pm

Dave Brown wrote:The reason we get the coldest weather in Feb, is we are far more likely to have blocking easterlies than in Dec or Jan. Although the hemisphere has started to warm, there is still a lot of cold about, and we are more likely to experience it.

.
I am not sure its because the likelihood is greater, its just that the cold airmass over eastern europe is peaking in size and intensity and therefore when you get wind from the east its ten times worse in early feb than in december. Plus whilst solar output calculation says 19th january as the turning point, i suspect it is at least 2 or 3 weeks before the positive output starts to have any meaningful effects.
However bear in mind that sea and surface temps in our part of the world are between 1C and 4 c above average this year , and we have a very good head start towards spring.
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Re: Very stormy period coming up

Post by Conifers » Sun Feb 02, 2014 10:38 pm

Dave Brown wrote:as solar input outweighs radiation cooling from 19th January onward
Where does this datum come from? Sounds a bit improbable.


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Re: Very stormy period coming up

Post by GREVILLE » Sun Feb 02, 2014 10:41 pm

Could be hit by four different systems inside a week :roll:


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Re: Very stormy period coming up

Post by Nigel » Sun Feb 02, 2014 11:20 pm

Conifers wrote:
Dave Brown wrote:as solar input outweighs radiation cooling from 19th January onward
Where does this datum come from? Sounds a bit improbable.
Coldest day of year (rolling average) is 5th february , so the solar input must exceed rate of cooling prior to this day ,and given the turning point would be a flat bottomed graph , i would guess 19th january is about right.
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fern Rob
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Re: Very stormy period coming up

Post by fern Rob » Mon Feb 03, 2014 12:04 am

Bad winds here yesterday.
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Dave Brown
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Re: Very stormy period coming up

Post by Dave Brown » Mon Feb 03, 2014 12:32 am

Conifers wrote:
Dave Brown wrote:as solar input outweighs radiation cooling from 19th January onward
Where does this datum come from? Sounds a bit improbable.
One thing my wife hates is I watch BBC2 and 4 and memorise useless info :lol:

It was on the BBC series Orbit http://www.bbc.co.uk/programmes/b00xztbr/episodes/guide
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Re: Very stormy period coming up

Post by RozDevon » Mon Feb 03, 2014 7:40 am

Fierce wind here today.
Very red sky too.


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Re: Very stormy period coming up

Post by Dave Brown » Mon Feb 03, 2014 9:47 am

Calm here, winds only gusting to 20mph :wink:
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