Your CUtags.php?sce=dump shows
$WX['date'] = '7/11/2016';
and your Settings.php has
$SITE['WDdateMDY'] = false; // for WD date format of month/day/year. =false for day/month/year
so is expecting dd/mm/yyyy format. Change that to
$SITE['WDdateMDY'] = true; // for WD date format of month/day/year. =false for day/month/year
so the mm/dd/yyyy format of Cumulus tags can be parsed correctly and the wxstatus.php will stop showing the erroneous date.