HIP:wind

From Earlham CS Department
Revision as of 15:43, 3 April 2006 by Copelco (talk | contribs) (HIPs Standards)
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Colin will look into how to do damping of the direction and speed readimg.

HIPs Standards

  • Wind speed, direction, and gusts are recorded.
  • 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].

Standards

Federal Meteorological Handbook

Indiana State Climate Office


Databases








Placement

  • The international standard for anemometer height above the ground is 10 meters (33 feet) with no obstructions. [2]

Keeping Records

Sampling Standards

  • Mean Wind Speed and Direction: 2-minute mean of speed and direction sampled [2]
  • Wind direction is recorded in degrees from true north [1 19][2 ].

Data Sampling

Farmland

METAR

Calculations

  • The mode is consisidered the prevailing wind direction. [1 19]
  • Dividing each recording into a north-south and east-west vector, averaging them, and then reassembling the vectors. [1 19]

Sampling Standards

  • Mean Wind Speed and Direction: 2-minute mean of speed and direction sampled before the observation valid time sampled from high-resoluation data (minimum: 5 second instrument polling).
  • Gust: Maximum 'instantaneous' wind value observed in the 10 minutes before the observation time.

External Links

Data Sets