Meteorologlar sisi al\u00e7ak bir stratus bulutu olarak s\u0131n\u0131fland\u0131r\u0131r. Sisi pus<\/em>tan ay\u0131ran kritik e\u015fik g\u00f6r\u00fc\u015f mesafesidir: sis g\u00f6r\u00fc\u015f\u00fc 1 km’nin alt\u0131na indirirken pus g\u00f6r\u00fc\u015f\u00fc 1 km ile 2 km aras\u0131nda tutar. Her ikisi de ayn\u0131 k\u00fc\u00e7\u00fck yo\u011funla\u015fm\u0131\u015f damlac\u0131klardan olu\u015fur; aradaki tek fark yo\u011funluktur.<\/p>\n T\u00fcm sis olu\u015fumlar\u0131 tek bir s\u00fcrece dayan\u0131r: havan\u0131n doygunlu\u011fa ula\u015fmas\u0131 ve su buhar\u0131n\u0131n y\u00fczey yak\u0131n\u0131nda yo\u011funla\u015fmas\u0131. Bu durum birka\u00e7 farkl\u0131 \u015fekilde ger\u00e7ekle\u015febilir; ancak en yayg\u0131n yollar havan\u0131n so\u011futulmas\u0131 ya da \u00e7i\u011f noktas\u0131na ula\u015f\u0131lana kadar havaya nem eklenmesidir. Yo\u011funla\u015fma ba\u015flad\u0131\u011f\u0131nda, sakin r\u00fczg\u00e2rlar damlac\u0131klar\u0131n yukar\u0131 do\u011fru kar\u0131\u015fmak yerine yere yak\u0131n as\u0131l\u0131 kalmas\u0131na yard\u0131mc\u0131 olur.<\/p>\n Sakin r\u00fczg\u00e2rl\u0131 ve a\u00e7\u0131k gecelerde D\u00fcnya’n\u0131n y\u00fczeyi \u0131s\u0131y\u0131 h\u0131zla uzaya yayar. Y\u00fczeyin hemen \u00fczerindeki hava temas yoluyla so\u011fur; sonunda \u00e7i\u011f noktas\u0131na ula\u015f\u0131r ve yo\u011funla\u015fma ba\u015flar. Sisin vadilerde ve al\u00e7ak kesimlerde bu kadar s\u0131k g\u00f6r\u00fclmesinin nedeni budur: so\u011fuk, yo\u011fun hava a\u015fa\u011f\u0131ya akar ve en h\u0131zl\u0131 so\u011fudu\u011fu yerlerde birikir.<\/p>\n Farkl\u0131 s\u0131cakl\u0131k ve nem d\u00fczeylerine sahip iki hava k\u00fctlesi bir araya geldi\u011finde \u2014 \u00f6rne\u011fin s\u0131cak ve nemli havan\u0131n so\u011fuk bir deniz y\u00fczeyi \u00fczerinden ge\u00e7mesi durumunda \u2014 kar\u0131\u015fan hava doygunlu\u011fa ula\u015farak geni\u015f alanlarda sis olu\u015fturabilir. Bu mekanizma \u00f6zellikle okyanuslar ve b\u00fcy\u00fck g\u00f6ller \u00fczerinde yayg\u0131nd\u0131r.<\/p>\n Bazen hava s\u0131cakl\u0131\u011f\u0131 sabit kal\u0131r ancak havadaki su buhar\u0131 miktar\u0131 artar; \u00f6rne\u011fin so\u011fuk havan\u0131n alt\u0131ndaki \u0131l\u0131k bir su y\u00fczeyinden buharla\u015fma yoluyla. Yeterli nem eklendi\u011finde hava doygunlu\u011fa ula\u015f\u0131r ve sis a\u015fa\u011f\u0131dan yukar\u0131ya do\u011fru geli\u015fir.<\/p>\n K\u0131ta i\u00e7i b\u00f6lgelerde en yayg\u0131n g\u00f6r\u00fclen sis t\u00fcr\u00fcd\u00fcr. Sakin ve a\u00e7\u0131k gecelerde zeminin radyatif \u0131s\u0131 kayb\u0131yla h\u0131zla so\u011fumas\u0131 ve \u00fczerindeki havan\u0131n \u00e7i\u011f noktas\u0131na inmesiyle olu\u015fur. Radyasyon sisi genellikle al\u00e7ak kesimlerde ve vadilerde g\u00f6r\u00fcl\u00fcr, g\u00fcn do\u011fumundan hemen \u00f6nce en yo\u011fun h\u00e2line ula\u015f\u0131r ve g\u00fcne\u015fin y\u00fczeyi \u0131s\u0131tmas\u0131yla birlikte h\u0131zla da\u011f\u0131l\u0131r. Yerden birka\u00e7 y\u00fcz metreden y\u00fckse\u011fe \u00e7\u0131kmas\u0131 nadirdir.<\/p>\n S\u0131cak ve nemli havan\u0131n yatay olarak so\u011fuk bir y\u00fczey \u2014 \u00e7o\u011funlukla so\u011fuk bir okyanus ak\u0131nt\u0131s\u0131 ya da kar \u00f6rt\u00fcl\u00fc kara \u2014 \u00fczerinden ge\u00e7erek \u00e7i\u011f noktas\u0131na so\u011fumas\u0131yla olu\u015fur. Radyasyon sisinin aksine adveksiyon sisi<\/a> g\u00fcn boyunca ve geni\u015f mesafelerde s\u00fcrebilir; bu da onu deniz ta\u015f\u0131mac\u0131l\u0131\u011f\u0131 ve k\u0131y\u0131 havac\u0131l\u0131\u011f\u0131 i\u00e7in ciddi bir tehlike h\u00e2line getirir. San Francisco’nun me\u015fhur sisi, s\u0131cak Pasifik havas\u0131n\u0131n so\u011fuk Kaliforniya Ak\u0131nt\u0131s\u0131 \u00fczerinden akmas\u0131yla olu\u015fan klasik bir \u00f6rnektir.<\/p>\n So\u011fuk havan\u0131n daha \u0131l\u0131k bir su y\u00fczeyi \u00fczerinden ge\u00e7mesiyle olu\u015fur. Su, so\u011fuk havaya h\u0131zla buharla\u015f\u0131r ve havay\u0131 neredeyse an\u0131nda doygunlu\u011fa ula\u015ft\u0131rarak s\u0131cak bir bardaktan y\u00fckselen buhara benzer sis k\u0131vr\u0131mlar\u0131 olu\u015fturur \u2014 bu asl\u0131nda ayn\u0131 fiziksel s\u00fcre\u00e7tir. Suyun yaz s\u0131cakl\u0131\u011f\u0131n\u0131 korudu\u011fu ancak hava s\u0131cakl\u0131klar\u0131n\u0131n d\u00fc\u015ft\u00fc\u011f\u00fc sonbaharda nehirlerde ve g\u00f6llerde s\u0131k\u00e7a g\u00f6r\u00fcl\u00fcr.<\/p>\n Nemli havan\u0131n bir tepe ya da da\u011f yamac\u0131na zorla \u00e7\u0131kar\u0131lmas\u0131yla olu\u015fur; hava y\u00fckseldik\u00e7e bas\u0131n\u00e7 azald\u0131\u011f\u0131ndan adyabatik olarak so\u011fur. Arazi d\u00fczle\u015fmeden \u00f6nce \u00e7i\u011f noktas\u0131na ula\u015f\u0131l\u0131rsa yama\u00e7 ve zirve boyunca sis olu\u015fur. Yama\u00e7 sisi engebeli ve da\u011fl\u0131k arazilerde s\u0131k\u00e7a g\u00f6r\u00fcl\u00fcr; r\u00fczg\u00e2r y\u00f6n\u00fc sabit kald\u0131\u011f\u0131nda g\u00fcnlerce s\u00fcrebilir.<\/p>\n \u00c7evre arazisi taraf\u0131ndan y\u00f6nlendirilen ve hapsedilen bir radyasyon sisi t\u00fcr\u00fcd\u00fcr. Gece boyunca vadilere akan so\u011fuk hava, sabaha kadar onlarca metre kal\u0131nl\u0131\u011fa ula\u015fabilen bir tabaka olu\u015fturur. Vadi sisi \u00f6zellikle yo\u011fundur ve da\u011f\u0131lmas\u0131 yava\u015ft\u0131r; \u00e7\u00fcnk\u00fc \u00e7evre tepeler, sisi \u0131s\u0131t\u0131p buharla\u015ft\u0131racak olan al\u00e7ak a\u00e7\u0131l\u0131 g\u00fcne\u015f \u0131\u015f\u0131nlar\u0131n\u0131 engeller.<\/p>\n Sis damlac\u0131klar\u0131n\u0131n a\u015f\u0131r\u0131 so\u011fumu\u015f \u2014 0\u00b0C’nin alt\u0131nda s\u0131v\u0131 h\u00e2lde \u2014 oldu\u011fu ve yollar, u\u00e7aklar ile elektrik hatlar\u0131 gibi y\u00fczeylere temas etti\u011finde donarak k\u0131ra\u011f\u0131 buz tabakas\u0131 b\u0131rakt\u0131\u011f\u0131 durumlarda g\u00f6r\u00fcl\u00fcr. Dondurucu sis, havac\u0131l\u0131k ve kara ta\u015f\u0131mac\u0131l\u0131\u011f\u0131 a\u00e7\u0131s\u0131ndan \u00f6zellikle tehlikelidir; \u00e7\u00fcnk\u00fc b\u0131rakt\u0131\u011f\u0131 buz, tehlikeli bir kal\u0131nl\u0131\u011fa ula\u015fana kadar \u00e7o\u011funlukla g\u00f6zle fark edilemez.<\/p>\n Sis, ekonomik a\u00e7\u0131dan en maliyetli hava olaylar\u0131 aras\u0131nda s\u00fcrekli olarak \u00fcst s\u0131ralarda yer al\u0131r. Havac\u0131l\u0131k<\/a> a\u00e7\u0131s\u0131ndan k\u0131sa s\u00fcreli yo\u011fun bir sis bile y\u00fczlerce u\u00e7u\u015fu yere indirebilir, a\u011f genelinde zincirleme gecikmelere yol a\u00e7abilir ve havayollar\u0131n\u0131 belirli u\u00e7ak ve m\u00fcrettebat sertifikalar\u0131 gerektiren yaln\u0131zca aletli yakla\u015fma prosed\u00fcrlerine zorlayabilir. Kara ta\u015f\u0131mac\u0131l\u0131\u011f\u0131 ve lojistik<\/a> a\u00e7\u0131s\u0131ndan sis, kaza riskini \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r \u2014 ara\u015ft\u0131rmalar, d\u00fc\u015f\u00fck g\u00f6r\u00fc\u015f ko\u015fullar\u0131n\u0131 otoyollardaki \u00e7ok ara\u00e7l\u0131 kazalar\u0131n daha y\u00fcksek oranlar\u0131yla tutarl\u0131 bi\u00e7imde ili\u015fkilendirmektedir. Liman i\u015fletmecili\u011fi ve deniz<\/a> trafi\u011fi de benzer \u015fekilde etkilenir; g\u00f6r\u00fc\u015f mesafesi belirlenen e\u015fi\u011fin alt\u0131na d\u00fc\u015ft\u00fc\u011f\u00fcnde gemilerin h\u0131z\u0131 azaltmas\u0131 ve sis i\u015faretleri vermesi zorunlu h\u00e2le gelir.<\/p>\n Ula\u015f\u0131m\u0131n \u00f6tesinde sis, ekolojik a\u00e7\u0131dan da \u00f6nemli bir rol \u00fcstlenir. K\u0131y\u0131 ve da\u011f ekosistemlerinde bitki \u00f6rt\u00fcs\u00fc taraf\u0131ndan yakalanan sis \u2014 sis damlas\u0131 olarak bilinen bu s\u00fcre\u00e7 \u2014 ya\u011f\u0131\u015f\u0131n olmad\u0131\u011f\u0131 kuru mevsimlerde bitki topluluklar\u0131n\u0131 besleyerek yerel su b\u00fct\u00e7esine \u00f6nemli katk\u0131lar sa\u011flayabilir.<\/p>\n Aradaki fark yaln\u0131zca yo\u011funluk ve bunun yaratt\u0131\u011f\u0131 g\u00f6r\u00fc\u015f mesafesiyle ilgilidir. Sis yatay g\u00f6r\u00fc\u015f\u00fc 1 km’nin alt\u0131na indirirken pus g\u00f6r\u00fc\u015f\u00fc 1 km ile 2 km aras\u0131nda tutar. Her ikisi de ayn\u0131 as\u0131l\u0131 su damlac\u0131klar\u0131ndan olu\u015fur; pus yaln\u0131zca daha seyrektir. G\u00fcnl\u00fck dilde iki kelime \u00e7o\u011funlukla birbirinin yerine kullan\u0131lsa da meteoroloji ve havac\u0131l\u0131kta 1 km’lik s\u0131n\u0131r, u\u00e7u\u015f kurallar\u0131 ve denizcilik mevzuat\u0131 a\u00e7\u0131s\u0131ndan ger\u00e7ek sonu\u00e7lar\u0131 olan kesin bir operasyonel e\u015fiktir.<\/p>\n Do\u011fru sis tahmini, operasyonel meteorolojinin en zorlu problemlerinden biri olmaya devam etmektedir. Sis olu\u015fumu y\u00fczey s\u0131cakl\u0131\u011f\u0131, \u00e7i\u011f noktas\u0131, r\u00fczg\u00e2r h\u0131z\u0131, toprak nemi ve yerel arazi gibi fakt\u00f6rlerin hassas etkile\u015fimine ba\u011fl\u0131 oldu\u011fundan, bu girdilerdeki k\u00fc\u00e7\u00fck hatalar bile “yer yer sis” tahminini “yo\u011fun sis uyar\u0131s\u0131”na d\u00f6n\u00fc\u015ft\u00fcrebilir ya da olay\u0131n tamamen g\u00f6zden ka\u00e7\u0131r\u0131lmas\u0131na neden olabilir. Y\u00fczey g\u00f6zlem a\u011flar\u0131 ve uydu tabanl\u0131 arazi y\u00fczeyi s\u0131cakl\u0131k verileriyle desteklenen modern y\u00fcksek \u00e7\u00f6z\u00fcn\u00fcrl\u00fckl\u00fc say\u0131sal hava modelleri sis tahminini \u00f6nemli \u00f6l\u00e7\u00fcde geli\u015ftirmi\u015ftir; ancak karma\u015f\u0131k arazilerdeki yo\u011fun radyasyon sisi en iyi tahmin sistemlerini bile zorlamaya devam etmektedir.<\/p>","protected":false},"excerpt":{"rendered":"Sis Nas\u0131l Olu\u015fur?<\/h2>\n\n\n
![\"Sis](\"https:\/\/buluttan-cdn.s3.eu-central-1.amazonaws.com\/images\/weather-blog\/2026\/03\/fog_formation_process-1024x525.webp\")
Havan\u0131n So\u011fumas\u0131<\/h3>\n
Hava K\u00fctlelerinin Kar\u0131\u015fmas\u0131<\/h3>\n
Nem Eklenmesi<\/h3>\n
Sis T\u00fcrleri<\/h2>\n\n\n
![\"Radyasyon](\"https:\/\/buluttan-cdn.s3.eu-central-1.amazonaws.com\/images\/weather-blog\/2026\/03\/fog_types_comparison-1024x525.webp\")
Radyasyon Sisi<\/h3>\n
Adveksiyon Sisi<\/h3>\n
Buhar Sisi (Buharla\u015fma Sisi)<\/h3>\n
Yama\u00e7 Sisi<\/h3>\n
Vadi Sisi<\/h3>\n
Dondurucu Sis<\/h3>\n
Sis Neden \u00d6nemlidir?<\/h2>\n
Sis ile Pus Aras\u0131ndaki Fark Nedir?<\/h2>\n
Sis Nas\u0131l Tahmin Edilir?<\/h2>\n