Editing Anemometer (section)

==Effect of icing==
At airports, it is essential to have accurate wind data under all conditions, including freezing precipitation. Anemometry is also required in monitoring and controlling the operation of wind turbines, which in cold environments are prone to in-cloud icing. Icing alters the aerodynamics of an anemometer and may entirely block it from operating. Therefore, anemometers used in these applications must be internally heated.<ref>{{cite journal|doi=10.1175/1520-0426(2001)018<1457:AIIC>2.0.CO;2|year=2001|volume=18|issue=9|pages=1457|bibcode=2001JAtOT..18.1457M|title=Anemometry in Icing Conditions|journal=Journal of Atmospheric and Oceanic Technology|last1=Makkonen|first1=Lasse|last2=Lehtonen|first2=Pertti|last3=Helle|first3=Lauri|doi-access=free}} {{free access}}</ref> Both cup anemometers and sonic anemometers are presently available with heated versions.