Wind chill

[Jim Thompson]

On Sun, 30 Jan 2005 21:37:03 -0500, keith <krw@att.bizzzz> wrote:

On Sun, 30 Jan 2005 12:44:06 -0700, Jim Thompson wrote:

snip

I always seem to have business back east at the worst-weather times of
the year... Pittsburgh on Wednesday :-(

Better than Pittsburgh last Monday. That must have been a depressing
place! ;-)

I know, I was having great sport teasing the client's travel lady
about our mid-70's temperature.

It's cold here today... a cold front with rain came thru yesterday
afternoon... it's only +60°F, +15.5°C, here ;-)

It's hotter than hell here today. It got to 27F (-2C for the
Canuckistanis here), and there was a big bright thing in the sky. We're
kinda wondering what it was, but it left about 5:00PM.

Beware the "big bright thing in the sky", AKA the slush monster ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Active8]

On Sun, 30 Jan 2005 16:05:04 -0500, Spehro Pefhany wrote:

On Sun, 30 Jan 2005 13:42:27 -0700, the renowned Jim Thompson
thegreatone@example.com> wrote:

On Sun, 30 Jan 2005 21:12:46 +0100, Zak <jute@zak.invalid> wrote:

Gareth wrote:

It seems reasonable, to me, that measuring the heat loss from a heated
resistor could enable you to calculate windchill in the way the OP
suggested.

I'd suggest a sensor at body temperature, and measuring the power neede
to keep it warm.


Thomas

You'll need to insulate matching typical clothing and/or skin thermal
resistance.

...Jim Thompson

Is the object to get something like the "official" numbers? If so,
then there *is* a mathematical formula- and the OP can just measure
the required variables, plug them into the official forumula and spit
out the number. That's easiest and probably best.

Yes. It's in the JS code from that windchill calculator page that
was previously posted. I started to post it, but the line wrap
crapped it up.

Probably the best way as you said. Even the new formula isn't
perfectly linear and it says they've adjusted the wind speed for the
height above ground of the human face. That takes a lot of work out
of the project.

If the object is to get some new number that (perhaps better) reflects
how cold it "feels", that's something different. My favorite number,
although it's probably not very scientific, is the minutes (or
seconds) before exposed flesh freezes. ;-)

What's the equivalent in Phoenix? Minutes to fry an egg on the
sidewalk in midsummer? ;-)

LOL. My observation is that in winter, wind does more to make it

feel colder than a summer wind does to make it feel cooler - at
least during physical activity in the sun. The summer wind sometimes
appears to keep me from sweating, but IME that's just the air
keeping the skin dry That may lead you to believe it's not as hot,
but the whole time you're dehydrating. Normally, if you stop
sweating when you should be, you're headed for danger. If the wind
keeps the skin dry, you can't tell anything's changed until you
black out.

--
Best Regards,
Mike

 

[keith]

On Mon, 31 Jan 2005 07:32:20 -0700, Jim Thompson wrote:

On Sun, 30 Jan 2005 21:37:03 -0500, keith <krw@att.bizzzz> wrote:

On Sun, 30 Jan 2005 12:44:06 -0700, Jim Thompson wrote:

snip

I always seem to have business back east at the worst-weather times of
the year... Pittsburgh on Wednesday :-(

Better than Pittsburgh last Monday. That must have been a depressing
place! ;-)

I know, I was having great sport teasing the client's travel lady
about our mid-70's temperature.

I was referring to their non-show at the stadium the day before. The Pats
kicked their donkey, and at home. ...no snow even! Forget the 70F! It
was far colder there than the temperature would indicate, last Monday! ;-)

It's cold here today... a cold front with rain came thru yesterday
afternoon... it's only +60°F, +15.5°C, here ;-)

It's hotter than hell here today. It got to 27F (-2C for the
Canuckistanis here), and there was a big bright thing in the sky. We're
kinda wondering what it was, but it left about 5:00PM.

Beware the "big bright thing in the sky", AKA the slush monster ;-)

Naw! I gotta get my driveway cleaned off. Early January we had a
"little" wet snow on a Monday morning. By the time I got home in the
afternoon it had dropped 20F and was frozen solid. I'm just now getting
down to the black. ...Another few days and I may not need 4WD to get up
my short driveway.

Mud season is at least six weeks off. if we even have one this year.

--
Keith

 

[Jim Thompson]

On Sun, 30 Jan 2005 21:12:46 +0100, Zak <jute@zak.invalid> wrote:

Gareth wrote:

It seems reasonable, to me, that measuring the heat loss from a heated
resistor could enable you to calculate windchill in the way the OP
suggested.

I'd suggest a sensor at body temperature, and measuring the power neede
to keep it warm.


Thomas

You'll need to insulate matching typical clothing and/or skin thermal
resistance.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.