Cloudband na Arewa maso Yammacin Australiya

Australiya Northwest Cloudband (NWCB) , ko kuma kawai Arewa maso Yammacin Cloudband, rukuni ne na girgije mai faɗi, mai ci gaba, mai cike da danshi wanda ya shimfiɗa daga gabashin Tekun Indiya zuwa kudancin Australia, wanda ke samuwa a lokacin sanyi kuma gabaɗaya yana kawo hazo a duk faɗin nahiyar Australia. NWCB ita ce ta uku mafi yawan girgije a duniya kuma ta huɗu mafi yawan girgizar girgizar a Kudancin Hemisphere.

 Kafawa 
Ci gaba da daidaitawar NW-SE kuma tasirin Indian Ocean Dipole (IOD) da Madden-Julian oscillation (MJO), yanayin girgije yana samuwa lokacin da iska mai laushi da zafi a kan Tekun Indiya (kusa da Indonesia) ke tafiya zuwa kudu maso gabas kuma ya wuce Australia zuwa gefen yammacin tsarin matsin lamba a kudu maso gabar, inda suke hawa kan iska mai sanyi a cikin tsakiyar-latitudes kuma ta haka ne suka haifar da girgije. Rashin IOD yawanci yana haifar da karuwa a cikin girgije na arewa maso yamma.

Yankin girgije yana faruwa ne lokacin da tsarin matsin lamba a kudu maso yamma ya tura iska mai sanyi daga Kudancin Tekun zuwa arewa maso yammacin Australia, yayin da arewa maso gabas ke jan iska mai dumi, mai laushi daga Tekun Coral zuwa tsakiyar Australia. Lokacin da iska mai dumi na arewa maso gabas ya yi karo da iska mai sanyi na kudu maso yamma, rikice-rikice na su yana haifar da babban yanki na iska mai tasowa, don haka ya samar da girgije. Rashin iska da girgije da suka samo asali a kan Tekun Indiya sannan suka ratsa nahiyar. Girman zafin jiki na teku a gabashin Tekun Indiya, da kuma ƙananan matsin lamba (watau ƙarancin ruwan sama da ɓacin rai na wurare masu zafi) na iya samar da girgije.

 Tarihi 
A gefen zafi mai zafi, girgije gabaɗaya yana da nauyi kuma yana da ƙarfi, wanda ke samun danshi mai yawa a cikin sararin samaniya, yayin da ƙananan wurare suna da zafi da zafi. convective yana tsakiya tare da NW cloud band tun lokacin da canjin Iska ta kasuwanci ya fi rauni. NW cloudband yawanci yana da babban tushe na girgije.[1]￼

Wani fasalin wurare masu zafi, girgije yana ba da har zuwa 80% na ruwan sama na shekara-shekara don arewa maso yammacin Australia da har zuwa 40% na ruwan sama ya shekara-sheko don kudu maso Yammacin Ostiraliya, gami da mafi yawan ruwan sama na hunturu a arewa maso yamma da Ostiraliya ta Tsakiya, wanda ke da Yanayin bushewa a wannan kakar. Kudancin Australia, duk da haka, zai sami mafi yawan ruwan sama mai alaƙa da girgije lokacin da ƙungiyar ta haɗu da tsarin sanyi na gaba. Ƙungiyar tana ƙara ruwan sama a arewa maso yamma (Yankin Kimberley da Pilbara), tsakiya (Yankin Babban Victoria Desert) da kudu maso gabashin Australia (Kudancin Australia, Victoria, New South Wales da Tasmania).  

Cloudband wani nau'i ne mai zurfi na girgije wanda ke da nisan kilomita  (1,900  zuwa kilomita  (  tsawo (tare da faɗin akalla kilomita  (280 ) kuma zai haɗa gaba mai sanyi ko raguwa a ƙarshen kudu maso gabashin su zuwa ITCZ a ƙarshen arewa maso yammacin su. Yankin Kudancin Pacific sau da yawa ana haɗa shi da ƙungiyar girgije ta NW. Kungiyar tana da tsawon kilomita 5,000 (3,100 mi), inda za ta iya shimfiɗa daga Jakarta a Indonesia zuwa Hobart, Tasmania. A cikin matsanancin yanayi, har ma yana iya shimfiɗa daga rikice-rikice na wurare masu zafi a kusa da ma'auni a kudancin Sri Lanka zuwa Tasmania.

 Abubuwan da suka faru 
Yawanci suna faruwa tsakanin Maris da Oktoba, amma mafi yawa a ƙarshen kaka da farkon hunturu lokacin da tekuna da ke kewaye da ƙasar suke da dumi kuma rafin jet na subtropical yana da ƙarfi. Yana da tsayi daga 'yan kwanaki zuwa mako guda, sun fi yawa lokacin da yanayin zafi a gabashin Tekun Indiya (kusa da Ostiraliya) ya fi na yammacin Tekun Indiya girma (kusa gabas na Afirka da Yankin Larabawa). Cloudbands za su sami raguwa a ƙarshen hunturu da farkon bazara saboda tekun da ke kewaye da ƙasar za su kasance masu sanyi.

 Manazarta 

 Haɗin waje 

 Tasirin Arewa maso Yammacin Cloudbands a Kudu maso Yamma na Australia Rainfall