How to calculate the hourly wind speed
Revision as of 08:18, 5 February 2024 by Rudolf@tygron.nl (talk | contribs)
The hourly wind speed from the KNMI weather data table column FH has to be divided by 10, since it is defined in 0.1 m/s.
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| Column | Name | Unit | Dutch Description |
|---|---|---|---|
| 2/B | YYYYMMDD | Date | datum (YYYY=jaar,MM=maand,DD=dag) |
| 3/C | HH | Hour | tijd (HH=uur, UT.12 UT=13 MET, 14 MEZT. Uurvak 05 loopt van 04.00 UT tot 5.00 UT |
| 4/D | DD | Degrees | Windrichting (in graden) gemiddeld over de laatste 10 minuten van het afgelopen uur (360=noord, 90=oost, 180=zuid, 270=west, 0=windstil 990=veranderlijk. Zie http://www.knmi.nl/kennis-en-datacentrum/achtergrond/klimatologische-brochures-en-boeken |
| 5/E | FH | 0.1 m/s | Uurgemiddelde windsnelheid (in 0.1 m/s). Zie http://www.knmi.nl/kennis-en-datacentrum/achtergrond/klimatologische-brochures-en-boeken |
Notes
- The values at each hour regard the measurement over the preceding hour up to that time. To obtain the value for 12am, the values at 12am must be used.
- The wind speed (hourly, and daily average) can also be based on an other data source; Potentiele wind (UP): http://projects.knmi.nl/klimatologie/onderzoeksgegevens/potentiele_wind-sigma/. These values are often a few 0.1 m/s higher than the values from the historical KNMI weather data table.