Po skoraj to\u00c4\u008dno letu dni je Slovenijo ponovno zajel zimski mraz. V no\u00c4\u008di na 20.december 2009 se je na meteorolo\u00c5\u00a1ki postaji Zaplana ohladilo na -17,8\u00c2\u00b0C, v bli\u00c5\u00benjem mrazi\u00c5\u00a1\u00c4\u008du Dolinca pa na -30,8\u00c2\u00b0C. Vremenske razmere niso bile ugodne za doseganje\u00c2\u00a0zelo nizkih temperatur na meteorolo\u00c5\u00a1ki postaji Zaplana, kar se je zagotovo nekoliko poznalo tudi na temperaturah v okoli\u00c5\u00a1kih\u00c2\u00a0mrazi\u00c5\u00a1\u00c4\u008dih. V no\u00c4\u008di na 19.december 2010 prav tako vremenske razmere niso dovoljevale posebno nizkih temperatur in kot se je kasneje\u00c2\u00a0izkazalo, so bile temperature nekoliko vi\u00c5\u00a1je kot v\u00c2\u00a0lanskem decembru.<\/p>\n
Obetala se je jasna no\u00c4\u008d\u00c2\u00a0\u00c2\u00a0ob prisotnosti ve\u00c4\u008dje koli\u00c4\u008dine novozapadlega snega. 18.decembra popoldne je bilo na obmo\u00c4\u008dju meteorolo\u00c5\u00a1ke postaje izmerjeno 48cm snega, sne\u00c5\u00bena odeja je bila sestavljena iz starega pomrznjenega\u00c2\u00a0snega in iz debelej\u00c5\u00a1e plasti novega\u00c2\u00a0suhega snega. \u00c4\u0152eprav je padlo ve\u00c4\u008d kot 30cm novega snega, pa\u00c2\u00a0je bilo izmerjeno samo 18,2mm padavin. Suh in\u00c2\u00a0puhast sneg\u00c2\u00a0omogo\u00c4\u008da mo\u00c4\u008dne no\u00c4\u008dne ohladitve. Kmalu se je izkazalo, da bo\u00c2\u00a0na no\u00c4\u008dno\u00c2\u00a0ohlajanje vplivalo ve\u00c4\u008d omejitvenih dejavnikov. Na Zaplani se je pri\u00c4\u008delo ohlajati z za\u00c4\u008detne temperature -5\u00c2\u00b0C, zve\u00c4\u008der pa je temperatura \u00c5\u00bee stagnirala zaradi obla\u00c4\u008dnosti. Ob ponovni razjasnitvi se\u00c2\u00a0je temperatura ponovno spu\u00c5\u00a1\u00c4\u008dala, vendar je vsaj na Spodnji Zaplani sredi no\u00c4\u008di ohlajanje \u00c5\u00bee motil veter.\u00c2\u00a0Motnje v ohlajanju\u00c2\u00a0so bile zabele\u00c5\u00beene zgolj na Zaplani, ne pa tudi na bli\u00c5\u00benjih in bolj zati\u00c5\u00a1nih\u00c2\u00a0meteorolo\u00c5\u00a1kih postajah Petkovec in Logatec.\u00c2\u00a0V vi\u00c5\u00a1inah se je namre\u00c4\u008d krepil zahodni veter, ki je po satelitskih posnetkih sode\u00c4\u008d za dinarsko gorsko pregrado \u00c5\u00bee povzro\u00c4\u008dal nastanek oblakov v smeri Idrije. Kljub vsemu je nebo ostalo ve\u00c4\u008dinoma jasno do 4.30 zjutraj, ko je obla\u00c4\u008dnost povzro\u00c4\u008dila nara\u00c5\u00a1\u00c4\u008danje temperature na vseh treh omenjenih meteorolo\u00c5\u00a1kih postajah. Na Zaplani je bila najni\u00c5\u00beja no\u00c4\u008dna temperatura -15,3\u00c2\u00b0C, na Petkovcu -17,5\u00c2\u00b0C in v Gornjem Logatcu -20,7\u00c2\u00b0C. Kako velik vpliv je imel na ohlajanje zahodni veter, ka\u00c5\u00bee\u00c2\u00a0tudi dopoldansko ogrevanje, ko je bilo na Zaplani precej topleje kot na Petkovcu in v Logatcu, \u00c4\u008deprav je navadno ravno obratno.<\/p>\n
Razlika med Logatcem in Zaplano je\u00c2\u00a0\u00c5\u00bee v\u00c2\u00a0dinamiki no\u00c4\u008dnega\u00c2\u00a0ohlajanja. V Logatcu temperatura\u00c2\u00a0pada enakomerno, na Zaplani pa temperatura pogosto za\u00c2\u00a0kraj\u00c5\u00a1i \u00c4\u008das pada s stopnjo\u00c2\u00a0pribli\u00c5\u00beno\u00c2\u00a0-0,3\u00c2\u00b0C\/10min, nakar se temperatura\u00c2\u00a0 prehodno lahko ustali ali celo rahlo nara\u00c5\u00a1\u00c4\u008da. Kasneje se spet pojavijo\u00c2\u00a0hitri padci temperature in tako gre za nekak\u00c5\u00a1no\u00c2\u00a0cikli\u00c4\u008dno\u00c2\u00a0ohlajanje. Na meteorolo\u00c5\u00a1ki postaji Zaplana v no\u00c4\u008dnem \u00c4\u008dasu prevladuje veter ju\u00c5\u00benih smeri iz zgornjega dela\u00c2\u00a0 temperaturne inverzije nad Loga\u00c5\u00a1kim poljem in tak na\u00c4\u008din ohlajanja je\u00c2\u00a0verjetno povezan s tem, da se\u00c2\u00a0hladen zrak na Zaplano \u00c5\u00a1iri v nekak\u00c5\u00a1nih\u00c2\u00a0valovih. \u00c5\u00bde nekaj let se ne\u00c2\u00a0sestavijo\u00c2\u00a0dobre razmere za ohlajanje, ki bi trajale skozi celotno no\u00c4\u008d. V bolj izpostavljenih legah \u00c4\u008das ohlajanja ni toliko pomemben (mrazi\u00c5\u00a1\u00c4\u008da, Logatec), povsem druga\u00c4\u008de pa\u00c2\u00a0je na nekoliko dvignjeni Zaplani, kjer so zve\u00c4\u008der temperature lahko precej vi\u00c5\u00a1je kot v Logatcu, temperaturna razlika pa se\u00c2\u00a0proti jutru zmanj\u00c5\u00a1uje. Zaplana za nizke temperature potrebuje \u00c4\u008das, tega pa vreme\u00c2\u00a0v zadnjih zimah\u00c2\u00a0ne nudi. Sicer si je te\u00c5\u00beko razlagati dejstvo, da\u00c2\u00a0je bilo ob koncu 70. let prej\u00c5\u00a1njega stoletja na Zaplani ob ne\u00c2\u00a0najhuj\u00c5\u00a1em mrazu izmerjeno -23\u00c2\u00b0C, januarja 1993 pa v poznih ve\u00c4\u008dernih urah -20\u00c2\u00b0C .<\/p>\n
Podatki iz mrazi\u00c5\u00a1\u00c4\u008da Dolinca\u00c2\u00a0bodo\u00c2\u00a0na voljo\u00c2\u00a0v\u00c2\u00a0prihodnjih dneh.\u00c2\u00a0Na podlagi mraza v\u00c2\u00a0decembru 2009\u00c2\u00a0gre pri\u00c4\u008dakovati temperature okoli -28\u00c2\u00b0C,\u00c2\u00a0vendar so mrazi\u00c5\u00a1\u00c4\u008da dovolj svojstvena, da so kakr\u00c5\u00a1nekoli napovedi nezanesljive.\u00c2\u00a0Vredne omembe so mar\u00c5\u00a1rutne meritve temperatur, ki so bile izvedene v mrazi\u00c5\u00a1\u00c4\u008du Dvoj\u00c4\u008dek (dvojna vrta\u00c4\u008da pri \u00c4\u008debelnjaku, v bli\u00c5\u00beini\u00c2\u00a0mrazi\u00c5\u00a1\u00c4\u008da Dolinca)\u00c2\u00a018.decembra ob 21:00 uri. Takrat je bilo na zgornji meteorolo\u00c5\u00a1ki postaji Zaplana izmerjeno\u00c2\u00a0-10\u00c2\u00b0C, v Gornjem Logatcu -14\u00c2\u00b0C, v\u00c2\u00a0mrazi\u00c5\u00a1\u00c4\u008du Dvoj\u00c4\u008dek pa kar -25\u00c2\u00b0C in pri sne\u00c5\u00beni odeji -27\u00c2\u00b0C. Vse to govori v prid dejstvu, kako kompleksna je mikroklima mrazi\u00c5\u00a1\u00c4\u008d. Prav neverjetno je,\u00c2\u00a0 do kak\u00c5\u00a1nih temperaturnih razlik lahko prihaja\u00c2\u00a0med dnom Loga\u00c5\u00a1kega polja in dnom\u00c2\u00a0le malo vi\u00c5\u00a1je le\u00c5\u00bee\u00c4\u008de kra\u00c5\u00a1ke vrta\u00c4\u008de na Zaplani, pri \u00c4\u008demer gre v obeh primerih za reliefni depresiji,\u00c2\u00a0v katerih\u00c2\u00a0nastaja izrazita temperaturna inverzija. Mrazi\u00c5\u00a1\u00c4\u008de Dvoj\u00c4\u008dek sicer velja za hladnej\u00c5\u00a1e mrazi\u00c5\u00a1\u00c4\u008de od Dolince, vendar le ob dovolj \u00c5\u00a1ibkih vetrovih in ob\u00c2\u00a0prisotnosti sne\u00c5\u00bene odeje.<\/p>\n
Viri podatkov:<\/p>\n
– podatki z zasebnih meteorolo\u00c5\u00a1kih postaj<\/p>\n","protected":false},"excerpt":{"rendered":"
Po skoraj to\u00c4\u008dno letu dni je Slovenijo ponovno zajel zimski mraz. V no\u00c4\u008di na 20.december 2009 se je na meteorolo\u00c5\u00a1ki postaji Zaplana ohladilo na -17,8\u00c2\u00b0C, v bli\u00c5\u00benjem mrazi\u00c5\u00a1\u00c4\u008du Dolinca pa na -30,8\u00c2\u00b0C. Vremenske razmere niso bile ugodne za doseganje\u00c2\u00a0zelo nizkih temperatur na meteorolo\u00c5\u00a1ki postaji Zaplana, kar se je zagotovo nekoliko poznalo tudi na temperaturah v […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[15],"tags":[],"_links":{"self":[{"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=\/wp\/v2\/posts\/5045"}],"collection":[{"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5045"}],"version-history":[{"count":23,"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=\/wp\/v2\/posts\/5045\/revisions"}],"predecessor-version":[{"id":5815,"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=\/wp\/v2\/posts\/5045\/revisions\/5815"}],"wp:attachment":[{"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5045"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.slometeo.net\/zaplana\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}