[X-Unix] Calling Applescript alarm from script

[TjL]

Hey all.  I've written a script which will check the school closings
webpage for my kid's school and email me if it finds something.

That part is done.

However, what I would really like to do is have it pop up some kind of
alert window on my Mac with some kind of sound which keeps repeating
until I acknowledge the window.

Anyone have any ideas how to do that?  I'm assuming it might be
possible in Applescript, but I really don't know anything about AS, so
any pointers would be welcome.

Thanks!

TjL