Some useless temperature info

Jhimmy said:

Just found this snippet of info in yesterday's Daily Mail, but not sure if
it's any use to campers. It gives a "rough" estimate of the temperature at
dawn, which is the coldest part of day.

"Check the temperature at 2pm and again at 10pm, double the difference and
take it away from the afternoon temperature and you'll have the dawn
reading"

Example:

18c @ 2pm
9c @ 10pm
difference x 2 = 9 x 2 = 18
18 - (2pm temp) 18 = 0c

I wonder how accurate his is?

Jhimmy

I'd have to say that, in this country at least, such a formula is
useless. I've known it to be warmer at dawn than at 10 pm. . .

druidh

Bitstring <[email hidden]>, from the
wonderful person Jhimmy <[email hidden]> said

Quoted message said:

Just found this snippet of info in yesterday's Daily Mail, but not sure if
it's any use to campers. It gives a "rough" estimate of the temperature at
dawn, which is the coldest part of day.

"Check the temperature at 2pm and again at 10pm, double the difference and
take it away from the afternoon temperature and you'll have the dawn
reading"

Example:

18c @ 2pm
9c @ 10pm
difference x 2 = 9 x 2 = 18
18 - (2pm temp) 18 = 0c

I wonder how accurate his is?

I dunno, but it does seem more complicated than required. Why not just
says 'it'll drop as much between 10pm and dawn as it did between 2pm and
10pm'? .. that avoids this complicated 'doubling' which many recent
graduates are ill equipped to perform.

--
GSV Three Minds in a Can
Contact recommends the use of Firefox; SC recommends it at gunpoint.

Quoted message said:

I dunno, but it does seem more complicated than required. Why not just
says 'it'll drop as much between 10pm and dawn as it did between 2pm and
10pm'? .. that avoids this complicated 'doubling' which many recent
graduates are ill equipped to perform.

--
GSV Three Minds in a Can
Contact recommends the use of Firefox; SC recommends it at gunpoint.

Ah, but when they upgrade their GPS it'll come with a built-in calculator
;-)

Jhimmy

Jhimmy said:

Just found this snippet of info in yesterday's Daily Mail, but not sure if
it's any use to campers. It gives a "rough" estimate of the temperature at
dawn, which is the coldest part of day.

"Check the temperature at 2pm and again at 10pm, double the difference and
take it away from the afternoon temperature and you'll have the dawn
reading"

Example:

18c @ 2pm
9c @ 10pm
difference x 2 = 9 x 2 = 18
18 - (2pm temp) 18 = 0c

I wonder how accurate his is?

Not at all if a warm or cold front breezes past during the night.

Quoted message said:

Jhimmy

"GSV Three Minds in a Can" <[email hidden]> wrote

Quoted message said:

Quoted message said:

"Check the temperature at 2pm and again at 10pm, double the difference

and

Quoted message said:

Quoted message said:

take it away from the afternoon temperature and you'll have the dawn
reading"

Example:

18c @ 2pm
9c @ 10pm
difference x 2 = 9 x 2 = 18
18 - (2pm temp) 18 = 0c

I wonder how accurate his is?

I dunno, but it does seem more complicated than required. Why not just
says 'it'll drop as much between 10pm and dawn as it did between 2pm and
10pm'? .. that avoids this complicated 'doubling' which many recent
graduates are ill equipped to perform.

Because it's not the same thing? You could though say twice the 10pm temp
minus the afternoon temp.

d=a-2(a-n)
d=a-2a+2n
d=2n-a

innit?

Bitstring <[email hidden]>, from the wonderful person
AndyP <[email hidden]> said

Quoted message said:

"GSV Three Minds in a Can" <[email hidden]> wrote

Quoted message said:

Quoted message said:

"Check the temperature at 2pm and again at 10pm, double the difference

and

Quoted message said:

Quoted message said:

take it away from the afternoon temperature and you'll have the dawn
reading"

Example:

18c @ 2pm
9c @ 10pm
difference x 2 = 9 x 2 = 18
18 - (2pm temp) 18 = 0c

I wonder how accurate his is?

I dunno, but it does seem more complicated than required. Why not just
says 'it'll drop as much between 10pm and dawn as it did between 2pm and
10pm'? .. that avoids this complicated 'doubling' which many recent
graduates are ill equipped to perform.

Because it's not the same thing? You could though say twice the 10pm temp
minus the afternoon temp.

d=a-2(a-n)
d=a-2a+2n
d=2n-a

i.e. d = n -(a-n) which is what I said.

--
GSV Three Minds in a Can
Contact recommends the use of Firefox; SC recommends it at gunpoint.

"GSV Three Minds in a Can" <[email hidden]> wrote

Quoted message said:

Quoted message said:

Quoted message said:

>"Check the temperature at 2pm and again at 10pm, double the difference

and

Quoted message said:

>take it away from the afternoon temperature and you'll have the dawn
>reading"
>
>Example:
>
>18c @ 2pm
>9c @ 10pm
>difference x 2 = 9 x 2 = 18
>18 - (2pm temp) 18 = 0c
>
>I wonder how accurate his is?

I dunno, but it does seem more complicated than required. Why not just
says 'it'll drop as much between 10pm and dawn as it did between 2pm

and

Quoted message said:

Quoted message said:

Quoted message said:

10pm'? .. that avoids this complicated 'doubling' which many recent
graduates are ill equipped to perform.

Because it's not the same thing? You could though say twice the 10pm

temp

Quoted message said:

Quoted message said:

minus the afternoon temp.

d=a-2(a-n)
d=a-2a+2n
d=2n-a

i.e. d = n -(a-n) which is what I said.

You wouldn't flinch if I suggested you'd got a minus in the wrong place
would you. I apologise for wasting your time.

"I wonder how accurate his is?"

Its just a rough guide for clear stable conditions?

As others have stated many factors seriously effect the temperature -
cold front or warm front, cloud, etc......

[email hidden] said...

Quoted message said:

Just found this snippet of info in yesterday's Daily Mail, but not sure if
it's any use to campers. It gives a "rough" estimate of the temperature at
dawn, which is the coldest part of day.

"Check the temperature at 2pm and again at 10pm, double the difference and
take it away from the afternoon temperature and you'll have the dawn
reading"

*Boggle*
--
To reply see 'from' in headers; lose the domain, and insert dots and @
where common sense dictates.

"Jhimmy" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Just found this snippet of info in yesterday's Daily Mail, but not sure if
it's any use to campers. It gives a "rough" estimate of the temperature
at dawn, which is the coldest part of day.

Does it really matter knowing how cold it *might* be in the morning when out
camping? I'm quite satisfied with the 'wake up, stick head out of sleeping
bag/tent and feel the air' method, it's worked well for me and millions
others over the years!

Nick

On 13/10/05 10:20, in article [email hidden], "Nick

Pedley said:

Does it really matter knowing how cold it *might* be in the morning when out
camping? I'm quite satisfied with the 'wake up, stick head out of sleeping
bag/tent and feel the air' method, it's worked well for me and millions
others over the years!

Being reasonably low - say at GR10 level - there are no real problem. It
stays quite warm although you can have some wet and windy days. Higher up,
and the High Route, it can get pretty cold when the sun disappears (about
7.30). In the mornings - if there is a mountain in between you and the sun
- it is a cold start but then this gets you moving early. And remember, up
high your often sleeping at 2.000 - 2,5000 metres above sea level.

--
Andy Howell
Birmingham, UK

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