Chill
Factor (not a major concern in Florida, so when you need to know - pay
attention)
|
This Wind Chill Chart is
provided to help determine how cold you
will feel on a motorcycle even in warm temperatures with a slight
breeze. The wind chill factor is a measure of how fast heat is being
removed from your body. For example, if the air temperature is 40
degrees and you are riding at 20 miles per hour, it feels the same
as 30 degrees with no speed at all.
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The chart above is supposedly a "new" formula.....
The current formula uses
advances in science, technology, and computer
modeling to provide a more accurate, understandable,
and useful formula for calculating the dangers from
winter winds and freezing temperatures. Specifically,
the new WCT index:
-
Calculates wind speed at an average height of
five feet (typical height of an adult human face)
based on readings from the national standard height
of 33 feet (typical height of an anemometer)
-
Is based on a human face model
-
Incorporates modern heat transfer theory (heat
loss from the body to its surroundings, during cold
and breezy/windy days)
-
Lowers the calm wind threshold to 3 mph
-
Uses a consistent standard for skin tissue
resistance
-
Assumes no impact from the sun (i.e., clear
night sky).
Note: Windchill Temperature is only
defined for temperatures at or below 50 degrees F and
wind speeds above 3 mph. Bright sunshine may increase
the windchill temperature by 10 to 18 degrees F.
For more information, or to calculate
windchills, visit
http://www.nws.noaa.gov/om/windchill/index.shtml
|
| |
Cooling Power of Wind
Expressed as "Equivalent Chill Temperature" |
|
Riding Speed MPH
|
Temperature (degrees F) |
|
50 |
45 |
40 |
35 |
30 |
25 |
20 |
15 |
10 |
5 |
0 |
|
Equivalent Chill
Temperature |
|
5 |
45 |
40 |
35 |
30 |
25 |
20 |
15 |
10 |
5 |
0 |
-5 |
|
10 |
40 |
35 |
30 |
20 |
15 |
10 |
5 |
0 |
-10 |
-15 |
-20 |
|
15 |
36 |
29 |
25 |
15 |
10 |
0 |
-5 |
-10 |
-20 |
-25 |
-30 |
|
20 |
33 |
27 |
20 |
10 |
5 |
0 |
-10 |
-15 |
-25 |
-30 |
-35 |
|
25 |
30 |
22 |
15 |
10 |
0 |
-5 |
-15 |
-20 |
-30 |
-35 |
-45 |
|
30 |
29 |
21 |
10 |
5 |
0 |
-10 |
-20 |
-25 |
-30 |
-30 |
-40 |
|
35 |
28
|
20
|
10
|
5
|
-5
|
-10
|
-20
|
-30
|
-35
|
-35
|
-40
|
|
40 |
27
|
19
|
10
|
0
|
-5
|
-15
|
-20
|
-30
|
-35
|
-35
|
-45
|
| |
Little Danger |
Increasing Danger!!!
(Flesh may freeze within 1 min.) |
You can see from the above chart that proper
clothing is essential for safety and comfort while cruising down
the highway.
(Note: Winds above 40 mph have little
additional effect.)
|
|
Harley Owners Group
