I have tried using Riptide but that works on a higher level
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You can with a Visualforce page using javascript (so the user gets alerted before they click save). On a standard page layout this will be possible unless you do a lot of workarounds, which I wouldn't recommend.
I haven't used Riptide, so not sure when they do there alerts (on save or on the picklist being accessed)
EDIT: Javier has great example for the alert on saving. My post was about having the popup before you save (ie: change picklist value and immediately get popup).