CFLib.org – CalculateWindChill

CalculateWindChill(intAirTemperature, intWindSpeed)

Last updated August 22, 2001

author

Version: 1 | Requires: ColdFusion 5 | Library: ScienceLib

Rated 4 time(s). Average Rating: 3.5

Description:
This function calculates the wind chill based upon the new NWS Wind Chill Index calculations. Source: http://www.crh.noaa.gov/dmx/0winter/new_windchill.html According to the documentation, this new cacluation will:

Use wind speed calculated at 5 feet (average human face height)
Be based upon a human face model
Incorporate modern heat flow theory
Lower the calm wind threshold to 3 mph
Use a consistant standard for skin tissue resistance
Assume the worst case for solar radiation (clear night sky)

Return Values:
Returns the wind chill.

Example:

view plain print about

<cfset VARIABLES.intFahrenheit = 35>
<cfset VARIABLES.intWindSpeed = 30>
The Wind Chill is <cfoutput>#CalculateWindChill(VARIABLES.intFahrenheit, VARIABLES.intWindSpeed)#</cfoutput> degrees Fahrenheit.<br>

<cfset VARIABLES.intFahrenheit = 35>
<cfset VARIABLES.intWindSpeed = 30>
The Wind Chill is <cfoutput>#CalculateWindChill(VARIABLES.intFahrenheit, VARIABLES.intWindSpeed)#</cfoutput> degrees Fahrenheit.<br>

Parameters:

Name	Description	Required
intAirTemperature	Temperature	Yes
intWindSpeed	Wind speed in MPH	Yes

Full UDF Source:

	
	
			
			
			
				
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				ColdFISH is developed by Jason Delmore.  Source code and license information available at coldfish.riaforge.org.  Version 3.1.1
				
			<cfscript>
/**
 * This function calculates the wind chill based upon the new NWS Wind Chill Index calculations.
 * 
 * @param intAirTemperature 	 Temperature 
 * @param intWindSpeed 	 Wind speed in MPH 
 * @return Returns the wind chill. 
 * @author Russel Madere (&#114;&#109;&#97;&#100;&#101;&#114;&#101;&#64;&#116;&#117;&#114;&#98;&#111;&#115;&#113;&#117;&#105;&#100;&#46;&#99;&#111;&#109;) 
 * @version 1, August 22, 2001 
 */
function CalculateWindChill(intAirTemperature, intWindSpeed)
{

    return Round(35.74 + (0.6215 * intAirTemperature) - (35.75 * (intWindSpeed ^ 0.16)) + (0.4275 * intAirTemperature * (intWindSpeed ^ 0.16)));

}
</cfscript>
		<cfscript>
/**
 * This function calculates the wind chill based upon the new NWS Wind Chill Index calculations.
 * 
 * @param intAirTemperature      Temperature 
 * @param intWindSpeed      Wind speed in MPH 
 * @return Returns the wind chill. 
 * @author Russel Madere (rmadere@turbosquid.com) 
 * @version 1, August 22, 2001 
 */
function CalculateWindChill(intAirTemperature, intWindSpeed)
{

    return Round(35.74 + (0.6215 * intAirTemperature) - (35.75 * (intWindSpeed ^ 0.16)) + (0.4275 * intAirTemperature * (intWindSpeed ^ 0.16)));

}
</cfscript>