Difference between revisions of "HIP:wind"
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== HIPs Standards == | == HIPs Standards == | ||
| − | * Wind direction and speed shall be determined by averaging the values over a 2-minute period []. | + | * Wind direction and speed shall be determined by averaging the values over a 2-minute period [[http://www.ofcm.gov/fmh-1/pdf/E-CH5.pdf Handbook]]. |
* Instantaneous velocities are sampled every 30 seconds. | * Instantaneous velocities are sampled every 30 seconds. | ||
| − | + | == Standards == | |
| + | === Federal Meteorological Handbook === | ||
| + | * http://www.ofcm.gov/fmh-1/fmh1.htm | ||
| + | * [[http://www.ofcm.gov/fmh-1/pdf/E-CH5.pdf Wind]] | ||
| + | === 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 == | == Databases == | ||
Revision as of 14:47, 3 April 2006
Colin will look into how to do damping of the direction and speed readimg.
Contents
HIPs Standards
- Wind direction and speed shall be determined by averaging the values over a 2-minute period [Handbook].
- Instantaneous velocities are sampled every 30 seconds.
Standards
Federal Meteorological 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
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
NWS Spaceflight Meterology Group
- http://www.srh.noaa.gov/smg/wxsensors.htm
- Raw sensor data: once every 10-30 seconds
- Averaging period: two minute wind direction and speed
- Gust: highest instantaneous measurement in past two minutes
Farmland
- http://shadow.agry.purdue.edu/cgi-bin/map_patrol/images/cd_zen.map?162,104
- Lists wind direction, speed, and gust.
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.
Federal Meteorological Handbook
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
- 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
