A severe late spring storm in central Mexico in March 2016 that struck the Monarch Butterfly Biosphere Reserve was unique because it was accompanied by high-velocity winds that eliminated the normal thermal protection provided by the Oyamel fir forest. Temperatures throughout the forest merged with the colder open-area ambient temperatures. The storm was in effect a rain and snow storm sandwiched within a powerful and sustained wind storm, followed by lethal freezing that killed 31–38% of the butterflies in the Sierra Chincua and Cerro Pelón overwintering colonies.
Original Source [2]
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/butterfly-mortality-and-salvage-logging-march-2016-storm-monarch-butterfly-biosphere
[2] https://academic.oup.com/ae/article/63/3/151/4139697/Butterfly-Mortality-and-Salvage-Logging-from-the
[3] http://admin.indiaenvironmentportal.org.in/category/author/lincoln-p-brower
[4] http://admin.indiaenvironmentportal.org.in/category/author/ernest-h-williams
[5] http://admin.indiaenvironmentportal.org.in/category/author/pablo-jaramillo-l%C3%B3pez-et-al
[6] http://admin.indiaenvironmentportal.org.in/category/journal/american-entomologist
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/butterflies
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/deforestation
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/storms
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biosphere-reserves
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mexico
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-america