{"id":399,"date":"2012-05-14T11:16:47","date_gmt":"2012-05-14T11:16:47","guid":{"rendered":"http:\/\/ialert.com\/blog\/?p=399"},"modified":"2014-09-20T20:32:43","modified_gmt":"2014-09-20T20:32:43","slug":"heat-index-calculator","status":"publish","type":"post","link":"https:\/\/ialert.com\/blog\/weather-articles\/heat-index-calculator\/","title":{"rendered":"Heat Index Calculator"},"content":{"rendered":"<p><script type=\"text\/javascript\" src=\"http:\/\/iAlert.com\/js\/v20\/metcalcs.js\"><\/script><\/p>\n<p>During hot summer days it sometimes feels hotter outside than the actual temperature suggests and it might very well be when you consider the &#8220;Heat Index&#8221;.  <\/p>\n<p>The heat index is a mathematical combination of air temperature and relative humidity which provides you the &#8220;how hot it really feels&#8221; temperature. Let me explain, when our bodies sweat the water evaporates carrying heat away from the skin allowing us to cool down, however when the humidity is high water does not evaporate as fast so the body retains more heat and you feel hotter.  Below is a heat index conversion calculator so you can know the &#8220;how hot it really feels&#8221; temperature&#8230;..<br \/>\n&nbsp;<br \/>\n<center><\/p>\n<table border=\"3\" cellpadding=\"1\" bgcolor=\"#99BBEE\" width=\"290\" bordercolor=\"#000000\">\n<tr>\n<td valign=\"middle\">\n<form name=\"heat\">\n<div align=\"center\"><center><\/p>\n<h3><font face=\"Arial, Helvetica\" color=black><b>Calculate<br \/>\n                Heat Index<\/b><\/font><br \/>\n                  <font face=\"Arial,Helvetica\" size=\"-1\" color=black>Enter temperature and relative humidity below to calculate heat index<\/font><\/h3>\n<p>              <\/center><\/div>\n<div align=\"center\"><center><\/p>\n<table border=\"0\">\n<tr>\n<td width=\"100\" valign=\"MIDDLE\" nowrap=\"nowrap\"><font size=\"-1\" face=\"Arial, Helvetica\"><b>Temperature:<\/b><\/font><\/td>\n<td width=\"11\" valign=\"TOP\" nowrap=\"nowrap\">&nbsp;<\/td>\n<td width=\"79\" align=\"CENTER\" valign=\"TOP\" nowrap=\"nowrap\"><input type=\"text\" size=\"5\" name=\"temp\"><\/td>\n<\/tr>\n<tr>\n<td nowrap=\"nowrap\"><font size=\"-1\" face=\"Arial, Helvetica\"><b>Unit:<\/b><\/font><\/td>\n<td nowrap=\"nowrap\"><\/td>\n<td align=\"CENTER\" valign=\"TOP\" nowrap=\"nowrap\">\n<table width=\"100%\" height=\"1\" border=\"0\">\n<tr>\n<td align=\"center\" valign=\"middle\" nowrap=\"nowrap\"><font size=\"-1\" face=\"Arial, Helvetica\"><b><input type=\"radio\" name=\"convert\" value=\"1\" checked=\"checked\" \/>F<\/b><\/font><\/td>\n<td align=\"center\" valign=\"middle\" nowrap=\"nowrap\"><font size=\"-1\" face=\"Arial, Helvetica\"><b><input type=\"radio\" name=\"convert\" value=\"0\" \/>C<\/b><\/font><\/td>\n<\/tr>\n<\/table>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"MIDDLE\" nowrap=\"nowrap\"><font size=\"-1\" face=\"Arial, Helvetica\"><b>Relative Humidity:<\/b><\/font><\/td>\n<td valign=\"TOP\" nowrap=\"nowrap\"><img src width=\"10\" height=\"1\"><\/td>\n<td align=\"CENTER\" valign=\"TOP\" nowrap=\"nowrap\"><input type=\"text\" size=\"5\" name=\"rh\"><\/td>\n<\/tr>\n<tr>\n<td valign=\"MIDDLE\" nowrap=\"nowrap\"><font size=\"-1\" face=\"Arial, Helvetica\"><b>Heat Index:<\/b><\/font><\/td>\n<td valign=\"TOP\" nowrap=\"nowrap\"><img src width=\"10\" height=\"1\"><\/td>\n<td align=\"CENTER\" valign=\"TOP\" nowrap=\"nowrap\"><input type=\"text\" size=\"5\" name=\"heatindex\" DISABLED style=\"background-color:#00CC66; color:black;\"><\/td>\n<\/tr>\n<tr>\n<td colspan=\"3\" align=\"CENTER\" nowrap=\"nowrap\">\n<table width=\"57%\" border=\"0\">\n<tr>\n<td width=\"50%\" align=\"center\" valign=\"middle\"><input type=\"button\" value=\"Compute\" onclick=\"heatIt(this.form)\" \/><\/td>\n<td width=\"50%\" align=\"center\" valign=\"middle\"><input type=\"Reset\" value=\"Reset\" \/><\/td>\n<\/tr>\n<\/table>\n<\/td>\n<\/tr>\n<\/table>\n<p>              <\/center><\/div>\n<\/p><\/form>\n<\/td>\n<\/tr>\n<\/table>\n<p><\/center><\/p>\n<p>Looking for a deeper understanding?  Below is the heat index equation&#8230;.<\/p>\n<p>HI = -42.379 + 2.04901523T + 10.14333127R &#8211; 0.22475541TR &#8211; 6.83783&#215;10-3T2 &#8211; 5.481717&#215;10-2R2 + 1.22874&#215;10-3T2R + 8.5282&#215;10-4TR2 &#8211; 1.99&#215;10-6T2R2<\/p>\n<p>HI = Heat Index<br \/>\nT = ambient dry bulb temperature (\u00b0F)<br \/>\nR = relative humidity (integer percentage)<\/p>\n<p>For more read the &#8220;<a href=\"http:\/\/iAlert.com\/docs\/The-Heat-Index-Equation.pdf\" title=\"The heat index equation\" rel=\"nofollow\">The Heat Index Equation<\/a>&#8221; paper written by National Weather Service Meteorologist Lans P. Rothfusz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>During hot summer days it sometimes feels hotter outside than the actual temperature suggests and it might very well be when you consider the &#8220;Heat Index&#8221;. The heat index is a mathematical combination of air temperature and relative humidity which provides you the &hellip;<span class=\"more\"> <a href=\"https:\/\/ialert.com\/blog\/weather-articles\/heat-index-calculator\/\">Read More&#8230;<\/a><\/span><\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13],"tags":[190,192,196,193,191,194,195],"class_list":["post-399","post","type-post","status-publish","format-standard","hentry","category-weather-articles","tag-conversion-calculator","tag-dry-bulb-temperature","tag-heat","tag-heat-index","tag-relative-humidity","tag-weather-calculator","tag-weather-tools"],"acf":[],"_links":{"self":[{"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/posts\/399","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/comments?post=399"}],"version-history":[{"count":105,"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/posts\/399\/revisions"}],"predecessor-version":[{"id":577,"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/posts\/399\/revisions\/577"}],"wp:attachment":[{"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/media?parent=399"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/categories?post=399"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ialert.com\/blog\/wp-json\/wp\/v2\/tags?post=399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}