Košava (wind)

Košava (pronounced [kɔ̌ʃaʋa]) is a cold, very squally southeastern wind found in Serbia and some nearby countries. It starts in the Carpathian Mountains and follows the Danube northwest through the Iron Gate region where it gains a jet effect, then continues to Belgrade. It can spread as far north as Hungary and as far south as Niš.[1]

In the winter, it can cause temperatures to drop to around -30 °C. In the summer, it is cool and dusty. It varies diurnally, and is strongest between 5:00 and 10:00 in the morning. Košava is usually caused by a low pressure zone over the Adriatic Sea and a corresponding high pressure zone in southern Russia.[1]

The name is also used traditionally in northwestern Bulgaria to mean a southeastern or eastern wind.[2][3] There exists the saying: "When košava blows, the Nišava freezes".[4]

Speed and occurrence of the Košava wind have declined in the period 1949-2010.[5] The same study showed that Košava usually lasts for 2 or 3 days, 1-day events being very rare.

Koshava wind blows when there is a high air pressure (an anticyclone) over eastern Europe and/or west Asia and a low pressure (a cyclone) over the middle and/or western Mediterranean region. [6] The strong anticyclone, however, is the main trigger for the Koshava wind. Koshava is also a gap flow windstorm. [7] Koshava's occurrence can be successfully forecast using the across-mountain mean sea level pressure and potential temperature differences.[8]


See also

References

  1. 1 2 "Kossava". Glossary of Meteorology, Second Edition. American Meteorological Society. June 2000. Retrieved 2007-03-11.
  2. ↑ "Народни умотворения и вярвания: Вятър" (in Bulgarian). Родово наследство. Retrieved 2008-10-19.
  3. ↑ "Какво ще бъде времето утре" (in Bulgarian). Caves / Пещери. Retrieved 2008-10-19.
  4. ↑ Иванов, Иван Танев. "Речник на оригинални старобългарски и диалектни думи и думи, свързани с българската етнография (к-л-м)" (in Bulgarian). Страница за прабългарите. Retrieved 2008-10-19.
  5. ↑ Romanić; et al. (2015). "Long-term trends of the 'Koshava' wind during the period 1949–2010". International Journal of Climatology. 35 (3): 288–302. Bibcode:2015IJCli..35..288R. doi:10.1002/joc.3981. Retrieved 11 March 2015.
  6. ↑ Romanić; et al. (2015). "Contributing factors to Koshava wind characteristics". International Journal of Climatology. Bibcode:2016IJCli..36..956R. doi:10.1002/joc.4397. Retrieved 20 August 2015.
  7. ↑ Romanić; et al. (2015). "Contributing factors to Koshava wind characteristics". International Journal of Climatology. Bibcode:2016IJCli..36..956R. doi:10.1002/joc.4397. Retrieved 20 August 2015.
  8. ↑ Romanić; et al. (2015). "Contributing factors to Koshava wind characteristics". International Journal of Climatology. Bibcode:2016IJCli..36..956R. doi:10.1002/joc.4397. Retrieved 20 August 2015.


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