Returns a SpatialPolygonsDataFrame for NWS weather forecast zones.
logical specifying whether to only return the name without creating the file
logical specifying whether to create "_05" version of the file that is simplified to 5%
A weather forecast zones shapefile is downloaded and converted to a
SpatialPolygonsDataFrame with additional columns of data. The resulting file will be created
in the spatial data directory which is set with
Name of the dataset being created.
zoneID is the unique identifier, and is the state code followed by zoneNumber.
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