Meteorological Phenomena: Frost Flowers

There's a broad spectrum of meteorological phenomena in the atmosphere which are created as a result of many diferrent processes which do take place withing the atmosphere itself. The ones which affect aviation are the most important for me and my work so I'll go over each over a certain period of time. All of the above mentioned phenomena can be divided into several important groups;

U atmosferi postoji sirok spektar meteoroloskih pojava koje nastaju kao posljedica mnogih procesa koji se u njoj desavaju. Oni koji su najbitniji za avijaciju su za mene i posao kojim se bavim najvazniji tako da cu tokom vremena spomenuti svaki od njih. Sve navedene pojave se mogu podijeliti u nekoliko bitnih skupina;

• hydrometeors / hidrometeori
• lithometeors / litometeori
• photometeors / fotometeori
• electrometeors /elektrometeori

Today I want to introduce the gorgeous Frost Flowers which fall into the hydrometeors category. What are hydrometeors? Any product of condensation or sublimation
of atmosphere vapor, whether formed in free atmosphere or at the
Earth's surface; also any water particles blown by the wind from the
Earth's surface.

Danas zelim predstaviti prekrasno Zamrznuto Cvjece koje spada u grupu hidrometeora. Sto su to hidrometeori? Svaki produkt kondenzacije ( fazni prijelaz iz gasovitog agregatnog stanja u tecno ) ili sublimacije ( tvar iz cvrstog agregatnog stanja prelazi u gasovito stanje ), bez obzira da li se desila u slobodnoj atmosferi ili na povrsini zemlje; isto ukljucuje i bilo koje cestice vode koje nanese vjetar sa povrsine zemlje.

There are actually two types of Frost Flowers. The ones that form on land and those that form over water. This time I want to present the frost flowers that are formed on land, most likely in the woods. These frost flowers are also known as “feather frost” and they can be seen in the eary mornings in late autumn or early winter just before the sun get the air tempearture up. See how this works is, the ground isn’t frozen but the temperature is freezing. The sap from long-stemmed plants expands and while it does, thin cracks form along the stem. Through those cracks water goes out and freezes the moment it hits the freezing air outside. There can be layers and layers of that freezed water the more water is drawn through the cracks. So a small puff-ball of cotton candy gets made
up of clusters of thin, curved ice filaments. These amazing nature creations are quite rare and I personally haven't yet stumbled upon one but if I ever do, I'll share my snaps of them.

Vjerovali ili ne, postoje cak dvije vrste Zamrznutog Cvijeca. Jedna su oni koji nastaju na tlu a drugi nastaju na povrsini vode. Ovaj put zelim predstaviti vrstu zamrznutog cvijeca koje se formira na tlu, najcesce u sumama. Ovi smrznuti cvjetovi su takodjer poznati i kao “paperjasti mraz” i moguce ih je opaziti u rano jutro u kasnu jesen ili ranu zimu tik prije nego sto sunce ne podigne temperaturu zraka. Sve funkcionise tako sto tlo nije smrznuto ali je temperatura zraka ispod nule. Biljni sok iz biljaka koje su dugih stabljika se siri i tokom sirenja stvara tanke pukotine duz stabljike. Kroz te pukotine prolazi voda i na izlazu, cim dodje u dodir sa ledenim zrakom, sledi se. Mogu na taj nacin nastati slojevi i slojevi sledjene vode sto vise vode izlazi kroz pukotine. Tako nastaju malene pufnaste loptice poput secerne vune od skupina tankih i zakrivljenih pramenova leda. Ove fantasticne kreacije prirode su prilicno rijetke i ja jos uvijek nisam naisla na jednu ali ako ikada budem, podijeliti cu sa vama i svoje slike.

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