The pic below was taken in July 2003 (pre Hurricane Ivan). It can be seen to give 7 forecasts.
The next pic from May 2008 (post Hurricane Ivan) shows that only 1 of the 7 forecasts proved to be incorrect, hence the 85% claim. It`s evident that the Weather Stone still proudly remains on the spot despite all the category force 5 that Ivan could muster and yes, it was the forecast board that was gone, I`m told it got blown away only to make its landfall in Carriacou!.
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