Despite The Weather Channel having a local forecast segment since day one, there was no official intro until 1989.
The next intro came in February, 1991 with the debut of the "Weather You Can Always Turn To" campaign.
Two intros came in '95 and two more in early '96. The second one was a result of the local forecast being rebranded "Local On The 8s."
A series of new intros came in 1998. Each one had a different backround video based on the time of the day. These lasted until 2002 when another series of intros debuted.
Here's every local forecast intro that I've posted on this site, in order by the year they were recorded.