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Old 26th Feb 2010, 13:24   #6 (permalink)
Join Date: Jun 2006
Location: Europe
Posts: 718
As others have mentioned, this is a met observation with an appended short forecast, ie a trend. It should be interpreted as valid for 2 hours, and as per normal interpretation the TEMPO indicates a condition likely to occur for less than 1 hour at a time, and for less than 50% of the time totally.
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