Freezing rain
Freezing rain is liquid water at zero degrees Celsius or lower. In nature, a specific set of conditions can cause freezing rain, which results in fast ice accretion. Freezing rain creates glaze ice.
Water can remain liquid even at subzero temperature when it travels through cold air, but does not have enough time to freeze into ice pellets. Freezing rain happens when frozen raindrops pass through a warm layer of air. This causes the drops to melt. Then the drops need to go again through freezing air, where their temperature falls below freezing, but they remain liquid. Freezing rain happens only in temperatures, where the droplets can unfreeze during their fall. It freezes upon contact with a process known as nucleation.
Freezing drizzle and - rain occur when droplets that were created in warm air fall through a layer of cold air and supercool. This is often where warm air is overriding cold air, such as in a warm front or where warm air is overriding cold air trapped in mountain valleys. These are the classic meteorological situations where freezing drizzle or freezing rain form. Drops falling through the cold air supercool, but not sufficiently to freeze before striking objects. [6] [7] [8]
References
- ↑ Famartin. Creative Commons Attribution-Share Alike 3.0. 2013-01-24 Glaze from freezing rain on a car in Elko, Nevada.jpg.
- ↑ Jin, J. Y. (2021) Study of Atmospheric Ice Accretion on Wind Turbine Blades. UiT Norges arktiske universitet. https://munin.uit.no/handle/10037/22115
- ↑ THE RATE AT WHICH RAIN FREEZES IN A FREEZING RAIN EVENT, The weather prediction, webpage, available (accessed 29.2.2021): http://www.theweatherprediction.com/habyhints/210/
- ↑ Will it rain, sleet or snow?, Weather.Gov, webpage, available (accessed 29.2.2021): https://www.weather.gov/source/zhu/ZHU_Training_Page/winter_stuff/winter_wx/winter_wx.html
- ↑ Niklas Kandelin: Icing Factors Affecting Railway Traffic Master of Science Thesis Tampere University Master’s Degree Programme, Materials Science October 2021
- ↑ Charles C. Ryerson. April 2013. Icing Management for Coast Guard Assets. Cold Regions Research and Engineering Laboratory. ERDC/ C R R E L TR-13-7.
- ↑ Cober, S. G., G. A. Isaac, and J. W. Strapp. 2001. Characterization of aircraft icing environments that include superc
- ↑ Korolev, A. V., G. A. Isaac, J. W. Strapp, and S. G. Cober. 2002. Observation of drizzle at temperatures below −20°C. AIAA 2002-0678. In Proceedings of the 40th American Institute of Aeronautics and Astronautics Aerospace Sciences Meeting and Exhibit, 14–17 January, Reno, NV