Oops.. that's correct, the current V4 advforecast2.php doesn't have a $forecastcond variable.. sorry. The V5 of the script does (to support the March release of the new forecast.weather.gov website).
An alternative approach would be the prune out the actual <img ... /> tag from $forecasticons[$i] and display that.. it would have the day name, condition in it (with a set of <br/> tags). Something like <?php
$i = 0;
$cond = preg_replace('|<img [^>]+>|i','',$forecasticons[$i]);
$cond = preg_replace('|<br/>|i',' ',$cond);
?>
Then $cond would look like
'Thursday Heavy Rain then Chance Rain '
Sorry for the confusion, I was looking at (and working on) the replacement advforecast2.php script which does have a $forecastcond variable added.