I think there may be a PHP syntax error in WU-forecast-inc.php since http://kreha.org/wdisplay/WU-radar-inc.php?sce=view results in a blank page (likely a PHP Fatal syntax error there). Copy your current WU-forecast-inc.php to a .txt file and post it here… I’ll take a look.
No, the subdirectory placement wouldn’t cause this error (it only means you’ll need to change the AJAX JavaScript ajaxWDwx.js to have the clientraw file be addressed as either ‘clientraw.txt’ or ‘./clientraw.txt’ and not ‘/clientraw.txt’).