>My sister-in-law is certain that she saw an attachment for the Palm Pilot that allows weather observations. I'm guessing she saw someone looking at a weather web-page they hot-synched. Anyone heard of a weather attachment?

This must be the one.
http://www.precisionnav.com/palmweatherguidemainnew.html

Here is a review:
http://www.palmguru.com/reviews/review2800.php

If you get it, let me know how it works.