Thanks for the reply. What I discovered is that there is a new calculation for computing wind chill. And, if the wind speed is relatively low, it will have little or no impact on the wind chill reading. Do a Google search for wind chill calculator to obtain the new formula. I put both in an Excel spreadsheet to see the difference using the same parameters.
Yes, NWS began using a new Wind Chill calculation in November 1, 2001. A link to their website that includes a built-in Wind Chill calculator is as follows:
NOTE: The wind chill formula is only good when the wind is above 3mph and below 110mph.
Also, wind chill is only valid for temperatures of 40 degrees F and below.
UPDATED: 2/12/2012@ 4:25pm PT
Here is another link that shows both Wind Chill and Heat Index which is based on Temp and Rel Humidity: