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As of June 3, 2003, the National Weather Service's Weather Prediction Center (WPC) has modified the domain
of its North American surface analysis. Specifically, coverage over the Atlantic and Pacific Oceans has
been reduced. As a consequence, the analysis is available approximately 15-30 minutes earlier.
Details regarding the changes can be found by viewing the
Public Information Statement.
The previous, larger domain was defined at a time when the North American
analysis was distributed by facsimile and only one chart could be sent for each analysis time and
this chart needed to meet the needs of a wide variety of users. With
the availability of several different surface analyses from different centers,
WPC no longer needs to delay the data-rich North American analysis
in order to prepare an analysis over a large section of the adjacent oceans. See
surface analysis frequently asked questions
for more information.