This data set contains polygons coresponding to the County Warning Areas (CWAs) of each Weather Forecast Office (WFO) in the National Weather Service (NWS).
Purpose:
CWA Boundaries are used delineate the area of responsibility for each WFO.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1995
Ending_Date: 20010414
Currentness_Reference: Current
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Continually
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -179.133163
East_Bounding_Coordinate: 179.788025
North_Bounding_Coordinate: 71.398094
South_Bounding_Coordinate: -14.604090
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: boundaries
Theme:
Theme_Keyword_Thesaurus: NGDA Portfolio Themes
Theme_Keyword: NGDA
Theme_Keyword: National Geospatial Data Asset
Theme_Keyword:
Governmental Units and Administrative and Statistical Boundaries Theme
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: CONUS
Place_Keyword: Alaska
Place_Keyword: U.S. Virgin Is.
Place_Keyword: American Samoa
Place_Keyword: Guam
Place_Keyword: Marianas
Place_Keyword: Midway Is.
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: National Weather Service/OST
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 8.1.0.642
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The attributes and boundaries were verifed by the individual Weather Forecast Offices (WFOs) by inspection of the data with a GIS or by viewing a hard or software image of the data.
Logical_Consistency_Report:
These data are believed to be logically consistent. Testing was performed by finding the smallest polygons and determining them to be "slivers" or genuine polygons and by overlaying a large polygon and combining, to find "holes' in the data. Since this data set is a polygon shapefile line geometry is presumed to be topologically clean.
Completeness_Report:
The shoreline boundaries of the data is dependent on the shoreline edges of rivers and bays as delineated on a USGS DLG The edges or borders of the boundary might change as the natural land changes and WFOs request changes. The CWA boundaries are consistent with county boundaries when county boundaries coorespond to Public Forecast Zone boundaries and the accuracy of the zone boundries that do not lie on county boundaries.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The data was created from USGS 1:2,000,000 DLG county data and assumed to have the same horizintal accuracy of that data. set. The internal accuracy of the zones that "split" counties varies depending on the criteria used to "split" the county (township line, coutour line, hand drawn, etc).
Source_Contribution: Area of responsibility for each NWS Weather Forecast Office
Process_Step:
Process_Description:
This dataset is a product of the offline private shape file containing unique polygons of county, cwa, time zone and forecast zone data. The "master file" was created from the original county and zone forecast datasets. All hanges to counties, zones, CWAs and time zones are first made to this "master" file. To create the CWA data set, a copy of the master file is created and renamed and the polygons are "dissolved" on the CWA field and the lat/lon of the centroids are calculated.
Process_Date: Unknown
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Ira Graffman
Contact_Organization: National Weather Service/OST
