TITLE: Mesonet South Dakota Roadway Weather Information System (RWIS) Network [JOSS] CONTACTS: Steve Williams P.O. Box 3000 Boulder CO 80307-3000 Email sfw@ucar.edu 303-497-8164 (voice) 970-491-8293 (fax) 1.0 DATA SET OVERVIEW This data set contains hourly resolution surface meteorological data from the South Dakota Road Weather Information System (RWIS) operated by the South Dakota Department of Transportation. The network includes 21 stations located throughout the state of South Dakota. This data set covers the period from 18 May to 7 July 2003. The data are in comma-delimited ASCII format. 2.0 INSTRUMENT DESCRIPTION 2.1 Instrumentation Data source has no information on instrumentation. 2.2 Station Locations Station locations are provided within the data file. The source does not have any elevation information. 3.0 DATA COLLECTION AND PROCESSING UCAR/JOSS conducted no processing or quality control on these data. 4.0 DATA FORMAT AND FILE NAMING 4.1 Data Format These data are in comma-delimited ASCII format. The first few lines contain station location information in the following order: 1. Site ID 2. Site Name 3. Site Latitude 4. Site Longitude The remaining lines in the file are data in the following order: 1. Site ID 2. Valid Time (UTC) 3. Valid Time (Unix timestamp) 4. Observation Time (UTC) 5. Observation Time (Unix timestamp) 6. Air Temperature (deg F) 7. Relative Humidity (%) 8. Wind Speed (mph?) 9. Wind Gust (mph?) 10. Wind Direction (deg) The data source thinks the wind speed and gust are in miles per hour, but is unsure. 4.2 File Naming conventions This data set is comprised of a single file called: SD_RWIS.dat 5.0 DATA REMARKS NONE. 6.0 REFERNCES SD RWIS home page: http://www.meridian-enviro.com/sddot/scan.html