HIP:wind

Standards

• Three types recorded: speed, direction, and gusts.
• Instantaneous velocities are sampled every 30 seconds.
• Wind direction is recorded in degrees from true north [5.5.1].
• Average wind direction and speed is determined by averaging the values over a 2-minute period [5.4].
• Wind gusts are the maximum instantaneous speed in the past 10 minutes [5.5.4].

Documents

Federal Meteorological Handbook

• [Federal Meteorological Handbook No. 1] - Surface Weather Observations and Reports
  • [Wind Section in Handbook]

Indiana State Climate Office

• http://shadow.agry.purdue.edu/sc.hly-faq.html#q11
• Measures once every second, averaged every 5 seconds. The 5 second averages are used in the 2-minute average.

Databases

• [Indiana Climate Data Access]

Farmland

• http://shadow.agry.purdue.edu/cgi-bin/map_patrol/images/cd_zen.map?162,104
• Lists wind direction, speed, and gust.

Calculations

• The mode is consisidered the prevailing wind direction.
• Dividing each recording into a north-south and east-west vector, averaging them, and then reassembling the vectors.

METAR

• http://metar.noaa.gov/

External Links

• International Weather Watchers Observer Handbook
• CWOP Weather Station Siting, Performance, and Data Quality Guide
• Averaging Wind Speed and Direction
• Wind Energy Resource Atlas of the United States
• Vector vs. Scalar Averaging of Wind Data
• http://www.ndbc.noaa.gov/wndav.shtml
• http://www.windustry.org/resources/WIND%20PROSPECTING_Monitoring%20at%20Site_FEB05.pdf