Sunny Amsterdam

I'm finding bright new ways to waste time. Like playing with my widgets. No, that's not like it sounds... My widgets are little thingemjigs that appear on my Apple screen when I press 'F12'. There's one there called AccuWeather.com. It tells me that it's blazing sun outside and 17 degrees. I know - I've just been out on the balcony (pointing out to Bud that his plant needs water) - but it's nice to have it confirmed on by computer.

Now the thing is, you can turn the little widget around and choose a different city and find out what the weather's like there. So I've found that Amsterdam, Netherlands, is not by any means the only Amsterdam on earth. There are others. For instance:
Amsterdam - South Africa (Sun and 26 celsius), Amsterdam - MO (Sun, 24), Amsterdam - Colombia (Rain, 18), Amsterdam - OH (Sun, 16), Amsterdam - NY (Rain, 14).

Now, all I need is to find out what MO means. Any ideas? Or should I fetch up my other world map widget?

P.S. I see it's raining in Seattle!