Thanks for the suggestion.

It looks like the [-1] forces retrieval of an earlier URL. I tried this, but this morning the problem has vanished from NOAA's XML data so I can't verify whether or not this will solve the problem.

I thought I could maybe do the following:

if (exists $data->{'data'}->{'parameters'}->{'conditions-icon'}->{'ico
+n-link'}->[0]) {
            $weatherIconURL = $data->{'data'}->{'parameters'}->{'condi
+tions-icon'}->{'icon-link'}->[0];
            print "Weather Icon: ", $data->{'data'}->{'parameters'}->{
+'conditions-icon'}->{'icon-link'}->[0], "\n";
        } else {
            $weatherIconURL = $data->{'data'}->{'parameters'}->{'condi
+tions-icon'}->{'icon-link'}->[-1];
            print "Weather Icon: ", $data->{'data'}->{'parameters'}->{
+'conditions-icon'}->{'icon-link'}->[-1], "\n";
        }
[download]

Do you think this will correctly handle the NIL exceptions?