saltysenior Posted July 15, 2011 Share Posted July 15, 2011 how is it figured?....... if a higher temp. is bad,..and a higher humidity is bad,..and a higher dew point is bad, ..then you should be able to add all three factors up and come up w/ a figure , right ???? today ,at about 2pm at stuart fl. the temp was 91*, humidity was 70%, and the dew point was 77 added up it comes to 238....in dallas,at the same time the readings were 102*, 30%, and 66, adding up to 198.......that is 40'' whatevers''difference . also about a 20 % difference....BUT the heat index in stuart was 101 and in dallas it was 111.......how can that be ??? Link to comment Share on other sites More sharing options...
k*** Posted July 15, 2011 Share Posted July 15, 2011 how can that be ??? because the heat index isn't calculated by adding the temp, relative humidity, and dewpoint. Link to comment Share on other sites More sharing options...
Mallow Posted July 15, 2011 Share Posted July 15, 2011 because the heat index isn't calculated by adding the temp, relative humidity, and dewpoint. This. The heat index calculation is quite complicated. It depends on either the temperature and dewpoint or the temperature and relative humidity... since dewpoint and relative humidity, at a constant temperature, are interchangeable (i.e. given the temperature and dewpoint, you can calculate RH, and given the temperature and RH, you can calculate the dewpoint). Link to comment Share on other sites More sharing options...
snowman21 Posted July 15, 2011 Share Posted July 15, 2011 Using google, you'll easily find the formula for heat index. Real Feel is generally not the same thing. It is a commercialized measure used by many TV stations and companies like Accu-Weather in various forms that include temperature and humidity as heat index does, but may additionally incorporate wind and/or the effects of the sun (solar radiation). Link to comment Share on other sites More sharing options...
griteater Posted July 16, 2011 Share Posted July 16, 2011 how is it figured?....... if a higher temp. is bad,..and a higher humidity is bad,..and a higher dew point is bad, ..then you should be able to add all three factors up and come up w/ a figure , right ???? today ,at about 2pm at stuart fl. the temp was 91*, humidity was 70%, and the dew point was 77 added up it comes to 238....in dallas,at the same time the readings were 102*, 30%, and 66, adding up to 198.......that is 40'' whatevers''difference . also about a 20 % difference....BUT the heat index in stuart was 101 and in dallas it was 111.......how can that be ??? Adding temp and dewpoint together is not a bad comparison....in your example, Dallas and Stuart would have the same value of 168....both sound miserable. Link to comment Share on other sites More sharing options...
saltysenior Posted July 21, 2011 Author Share Posted July 21, 2011 thanks for your replies .........however for my own entertainment ,and maybe even starting something new ,i will keep watch using the formula of adding the 3 readings to get a figure to compare locations that i communicate with... so for the ones who replied...todays winners......a tie with both locations at 2:00pm greenwich,ct. and stuart,fl,exacty the same readings of 90*temp---59%hum.---74*dewpoint......for a total of 223 whatamacallems [need a name] charlotte,nc.....209 lawrence,ks.....202 oak grove,or....196 Link to comment Share on other sites More sharing options...
battlebrick Posted July 21, 2011 Share Posted July 21, 2011 the heat index formula is ridiculous. Link to comment Share on other sites More sharing options...
Mencken_Fan Posted July 22, 2011 Share Posted July 22, 2011 Here's the heat index chart: http://www.weatherim.../heatindex.html The index here in Wilmington, N.C. hit a stunning 119F today (Thursday.) I don't believe I've ever seen it that high before. Link to comment Share on other sites More sharing options...
snowman21 Posted July 22, 2011 Share Posted July 22, 2011 The NWS formula: http://www.srh.noaa.gov/images/ffc/pdf/ta_htindx.PDF Link to comment Share on other sites More sharing options...
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