Everything here works with RHEL6's older version of Date::Manip, except for this one script (in fact, one line in this one script.)
--- mythplugins-0.24.1/mythweather/mythweather/scripts/us_nws/nws-alert.pl.orig	2011-07-13 16:58:11.401314143 -0600
+++ mythplugins-0.24.1/mythweather/mythweather/scripts/us_nws/nws-alert.pl	2011-07-13 17:00:31.286574670 -0600
@@ -12,7 +12,6 @@
 use XML::Parser;
 use base qw(XML::SAX::Base);
 use Date::Manip;
-use Date::Manip::TZ;
 use Data::Dumper;
 use Getopt::Std;
 use LWP::Simple;
@@ -88,8 +87,7 @@
     my $info;
 
     $date = ParseDate($date);
-    my $tz = new Date::Manip::TZ;
-    $date = Date_ConvTZ($date, $tz->curr_zone(), "UTC");
+    $date = Date_ConvTZ($date, '', "UTC");
     $date = UnixDate($date, "%O");
 
     my @dates;