Wind chill - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 8 Old 08-09-2012, 08:51 AM Thread Starter
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Wind chill

Hi all ,
just snowed here in Orange , ive got a weather station with inside and outside temp , had a look at the outside temp about 10mins ago -16c ok the sensor must be frazzled , went out to have a look at it , it is covered in a thin shell of ice and the wind is blowing a gale , now i know what going on , Windchill , just checked the temp again (4 mins later ) down to -29.7c wow that is cold no wonder i get so cold on the wee sometimes , i feel for you guys and gals who ride allyear round in the snow country , -31c now
Real outside temp 0.8c
wind speed 33km/h Wind Gusts 54km/h
Ozzy Strom

Learnt to ride on - Suzuki 80 -1969
[B]Bikes I have owned[/B] * CZ 175 * Yamaha DT250a * Honda CB450 * Kawa KL250 * Honda CB750F2 * Honda CR250m2 * Suzuki DR250 * Yamaha TX650a * Honda SL350 And Kawa KE175 * Honda CX500ec (Had it 16 Yrs, Wrecked by car turning in front of me) * BMW K100rs 1991
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post #2 of 8 Old 08-09-2012, 09:12 AM
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Other end of the scale...

I'm visiting Las Vegas , Where it's 44 deg c . Too hot to ride . Too hot to walk, even at midnight it was like opening the oven door and crawling in .
But at home , I do ride occasionally at temps as low as 0 , and despite the grip heaters , it's painful at high speed .
Alex
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post #3 of 8 Old 08-09-2012, 09:20 AM
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Hear what you are sayin Stromers but after record heat / drought for the month of July I'm ready for some cold. Course I'll probably be complaining then too. :mrgreen:

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post #4 of 8 Old 08-09-2012, 09:38 AM Thread Starter
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Been there done that too , about 13 years ago i rode from work near Forbes to Orange (70 miles ) , it was about 41c 4.00pm in the afternoon , i only got to Eugowra (25 miles) and i had to pull up and take a break at the pub (coke) after about an hour i set off again about half way between Eugowra and Orange you go up onto the central tablelands (big hill) the temp dropped like a rock , it was like walking into a aircon room . The ride from work to Eugowra was like hell
Ozzy Strom

Learnt to ride on - Suzuki 80 -1969
[B]Bikes I have owned[/B] * CZ 175 * Yamaha DT250a * Honda CB450 * Kawa KL250 * Honda CB750F2 * Honda CR250m2 * Suzuki DR250 * Yamaha TX650a * Honda SL350 And Kawa KE175 * Honda CX500ec (Had it 16 Yrs, Wrecked by car turning in front of me) * BMW K100rs 1991
Grey 2011 Wee-current bike
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post #5 of 8 Old 08-09-2012, 09:47 AM
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Quote:
Originally Posted by Ozzy Strom View Post
...
, had a look at the outside temp about 10mins ago -16c ok the sensor must be frazzled , went out to have a look at it , it is covered in a thin shell of ice and the wind is blowing a gale , now i know what going on , Windchill ,
...
Wind chill is a calculated number that essentially relates to how the skin of a human might lose heat based on the coolng effect of air moving over it.

A thermometer can't directly measure wind chill, it can only measure the actual temperature it sees. It can see a lower temperature if it is wet and air is blowing on it. If it is coated with ice then it certainly isn't reading wind chill but measuruing what it sees as the temeprature of the ice.

The sensor is not functioning properly.

..Tom

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post #6 of 8 Old 08-09-2012, 06:40 PM Thread Starter
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Quote:
Originally Posted by V-Tom View Post
Wind chill is a calculated number that essentially relates to how the skin of a human might lose heat based on the coolng effect of air moving over it.

A thermometer can't directly measure wind chill, it can only measure the actual temperature it sees. It can see a lower temperature if it is wet and air is blowing on it. If it is coated with ice then it certainly isn't reading wind chill but measuruing what it sees as the temeprature of the ice.

The sensor is not functioning properly.

..Tom
Hi tom,
looks like your right , this morning the outside temp is -12c with the sun shining on it.
I was not accurate saying the sensor was covered in ice , it had water and ice on it , so i think wind chill was still at work or am i wrong
Ozzy

Learnt to ride on - Suzuki 80 -1969
[B]Bikes I have owned[/B] * CZ 175 * Yamaha DT250a * Honda CB450 * Kawa KL250 * Honda CB750F2 * Honda CR250m2 * Suzuki DR250 * Yamaha TX650a * Honda SL350 And Kawa KE175 * Honda CX500ec (Had it 16 Yrs, Wrecked by car turning in front of me) * BMW K100rs 1991
Grey 2011 Wee-current bike
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post #7 of 8 Old 08-09-2012, 08:19 PM Thread Starter
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Quote:
Originally Posted by newhoco View Post
I'm visiting Las Vegas , Where it's 44 deg c . Too hot to ride . Too hot to walk, even at midnight it was like opening the oven door and crawling in .
But at home , I do ride occasionally at temps as low as 0 , and despite the grip heaters , it's painful at high speed .
Alex
Hi Alex ,
back in 1977 i was riding to work (Forbes NSW )from the family farm about 20 miles in the winter , some mornings it got down to -2/3c , talk about pain , i would have to put my hands in warm water for 10 mins to get them working again , never heard of heated grips at that time
Ozzy (Stephen)

Learnt to ride on - Suzuki 80 -1969
[B]Bikes I have owned[/B] * CZ 175 * Yamaha DT250a * Honda CB450 * Kawa KL250 * Honda CB750F2 * Honda CR250m2 * Suzuki DR250 * Yamaha TX650a * Honda SL350 And Kawa KE175 * Honda CX500ec (Had it 16 Yrs, Wrecked by car turning in front of me) * BMW K100rs 1991
Grey 2011 Wee-current bike
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post #8 of 8 Old 08-09-2012, 09:41 PM
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Quote:
Originally Posted by Ozzy Strom View Post
Hi tom,
looks like your right , this morning the outside temp is -12c with the sun shining on it.
I was not accurate saying the sensor was covered in ice , it had water and ice on it , so i think wind chill was still at work or am i wrong
Ozzy
Tom is correct, wind will have no effect on a (dry) thermometer. Wind chill is in effect a measurement of how wind will assist in drawing heat from a body which is trying to retain heat. With no wind, (and thus no heat transfer through forced convection), you will remain warmer. With the wind, convective heat transfer is increased, chilling you more quickly.

This page explains it well enough and has charts (Celsius or centigrade, and Fahrenheit along with wind speeds). So yes 20 degrees with a wind might feel like 10 degrees.

What you have with your *wet* thermometer is in effect what they call a wet bulb thermometer (a thermometer kept wet and subjected to air flow, which is used along with a dry thermometer to determine relative humidity). The wind, even as cold as it is, helps vaporizes some of the water. Heat is required to accomplish the phase change from liquid to vapour, which is drawn from the water and ice, cooling the thermometer below the actual temperature of the air. So again Tom is right, I guess, in saying the thermometer is reading the temperature of the ice.

This is the same as how vapourizing sweat on a dry day, with a nice breeze, will cool you. Sweat on a hot humid day, even with a breeze, does zip or close to it; other than make you feel clammy, and maybe stink a bit more than usual.

In winter, damp weather without wind I think just feels colder because heat conduction (as opposed to convection, above) is aided by the moisture screwing up the insulating value of your clothing, or the usually insulating dry static (unmoving) air near the body.

Riding wet in the the cold just sucks the heat out of you - this many of us know well, damn the science.

Marc

Marc, rider of a black 2009 V-Strom 650A ABS

"To the Companion who knows how to go light and fare hard, who is friendly with the rain, and finds no road too long." William Blake in "Brown Waters and other Sketches", Malbaie, May, 1915.

Last edited by perArdua; 08-09-2012 at 10:10 PM. Reason: minor change, trying not to be too wrong
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