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Jeff, The WMO manual on codes 386 part II addresses regional reporting practices including the time period that the max/min is valid for. The GEMPAK dcmetr decoder takes these differences into account as to what time is assigned to the max/min value. Steve Chiswell Unidata User Support On Wed, 26 Jun 2002, Jeff Masters wrote: > > I've been looking at the max/mins reported in the synoptic code obs across > the world, and have discovered that the "standards" for reporting max/mins > vary widely from one country to the next. For example, the UK reports a > min at 6Z for the 12 hour period ending at 6Z. Iceland reports mins at 9z, > presumably for the 12 hours ending at 9Z. But in Canada, the min reported > at 18Z is the 24 hour min, and the max reported at 12Z is the 24 hour max > for the period 6Z to 6Z. Does anyone know of a list of the various > international standards for reporting max and mins? > > Thanks, > ------------------------------------------------------------------------------ > Jeff Masters > (address@hidden) ( ) > Chief Meteorologist /\ Home of the ( ) > The Weather Underground, Inc. /\ / \ /\ /\ ( ) > 300 N Fifth Ave #240 / \/ \/ \ /\ / \ ------ > Ann Arbor, MI 48104 ______/ / \/ \_ \\\\\ > 734-994-8824 (voice) Weather Underground \`\`\ > 734-994-8919 (fax) http://www.wunderground.com >