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href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/kuopio/">Kuopio</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/kuusamo/">Kuusamo</a> </li> </ul> <li> <span> Haetuimmat L-Ö </span> <ul> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/lahti/">Lahti</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/lappeenranta/">Lappeenranta</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/lohja/">Lohja</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/mikkeli/">Mikkeli</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/naantali/">Naantali</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/nokia/">Nokia</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/oulu/">Oulu</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/pori/">Pori</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/porvoo/">Porvoo</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/raahe/">Raahe</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/rauma/">Rauma</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/riihimäki/">Riihimäki</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/rovaniemi/">Rovaniemi</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/salo/">Salo</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/savonlinna/">Savonlinna</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/seinäjoki/">Seinäjoki</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/tampere/">Tampere</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/tornio/">Tornio</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/turku/">Turku</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/vaasa/">Vaasa</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/vantaa/">Vantaa</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomi/varkaus/">Varkaus</a> </li> </ul> <li> <span> Haetuimmat ulkomailta </span> <ul> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/turkki/alanya/">Alanya</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/alankomaat/amsterdam/">Amsterdam</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/espanja/barcelona/">Barcelona</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/saksa/berliini/">Berliini</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/unkari/budapest/">Budapest</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/espanja/fuengirola/">Fuengirola</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/tanska/kööpenhamina/">Kööpenhamina</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/espanja/las+palmas/">Las Palmas</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/britannia/lontoo/">Lontoo</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/espanja/malaga/">Málaga</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/espanja/palma+de+mallorca/">Mallorca</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/yhdysvallat/new+york/">New York</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/ranska/nizza/">Nizza</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/ranska/pariisi/">Pariisi</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/viro/pärnu/">Pärnu</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/venäjä/pietari/">Pietari</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/tshekki/praha/">Praha</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/espanja/puerto+de+la+cruz/">Puerto de la Cruz</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/kreikka/rodos/">Ródos</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/italia/rooma/">Rooma</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/viro/tallinna/">Tallinna</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/espanja/teneriffa/">Teneriffa</a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/ruotsi/tukholma/">Tukholma</a> </li> </ul> </ul> </li> <li> <a href="https://web.archive.org/web/20211102051144/http://yle.fi/uutiset/tuoreimmat">Tuoreimmat</a> </li> </ul> <div class="font-size"></div> </nav> </div> </header> <div id="container"> <section class="topic"> <header> <h1>Kysy säästä ja sääilmiöistä</h1> <nav class="promonav"> <ul> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/ennuste"> Meteorologin ennuste </a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saakone"> Sääkone </a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/artikkelit/"> Ajankohtaista säästä </a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/saakuvat/"> Katsojien kuvat </a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://areena.yle.fi/tv/1257538" target="_blank"> Katso sääennuste </a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://liikennetilanne.tmfg.fi/" target="_blank"> Kelikamerat </a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/saakysymykset/"> Kysy säästä ja sääilmiöistä </a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/ylen_meteorologit_ja_palaute/11758150"> Meteorologit ja palaute </a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/saasanastoa/7019749"> Sääsanastoa </a> </li> <li> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/"> Etusivu </a> </li> </ul> </nav> </header> <div class="custom"> <section class="recents lazy-load" data-url="/saa/resources/ajax/latest?category=saakysymykset&includeSubsections=true&homeSectionOnly=false" data-timestamp="1389096354000" data-totalcount="200" data-offset="40"> <h1> Tuoreimmat artikkelit </h1> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/kuinka_pilvi_syntyy_/8850436" class="autoplay "> <figure class="max-120"> <span class="media"> <img src="https://web.archive.org/web/20211102051144im_/https://images.cdn.yle.fi/image/upload/w_120,h_68,c_fill/13-1-3422303.jpg" alt="Video: Yle Uutisluokka: Näin pilvi syntyy"/> <span class="play"></span> <figcaption> <span class="basic-icon"> Video </span> </figcaption> </span> </figure> <h1> Kuinka pilvi syntyy ? </h1> <p> Ylen säätoimitus ja Porvoon Linnajoen koulu olivat tänä vuonna mukana Ylen Uutisluokan toiminnassa. Yhtenä osana hanketta oli havainnollistaa kuinka pilvi syntyy. <span class="meta"> <time datetime="2016-04-30T18:59:14+03:00"> 30.4.2016 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/saako_el_nino_lisapuhtia_positiivisessa_vaiheessa_olevasta_pdosta/8254870"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/artikkelit/article8254862.ece/ALTERNATES/w120h68/Tyynen%20valtameren%20pitk%C3%A4jaksoinen%20v%C3%A4r%C3%A4htely%20PDO" alt="Grafiikka: Tyynen valtameren pitkäjaksoinen värähtely PDO"/> </figure> <h1> Saako El Niño lisäpuhtia positiivisessa vaiheessa olevasta PDO:sta? </h1> <p> Useimmille on tuttua, että ilmiö El Niño esiintyy 2-7- vuoden välein ja sen vaikutus kestää keskimäärin puolesta vuodesta puoleentoista vuoteen. Sen sijaan otsikoihin ei ole vielä noussut toinen, jaksoltaan pitkäaikaisempi Tyynellä valtamerellä vaikuttava ilmiö, joka näkyy ilmakehässä niin ikään tuulien, meren pintalämpötilan ja ilmanpaineen jaksollisena vaihteluna. <span class="meta"> <time datetime="2015-08-26T11:30:17+03:00"> 26.8.2015 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/atmospheric_river__vesihoyryjoki/8241926"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/artikkelit/article8241773.ece/ALTERNATES/w120h68/Esimerkkej%C3%A4%20vesih%C3%B6yryjoen%20n%C3%A4kymisest%C3%A4%20s%C3%A4%C3%A4satelliitin%20yhdistelm%C3%A4kuvissa" alt="Grafiikka: Esimerkkejä vesihöyryjoen näkymisestä sääsatelliitin yhdistelmäkuvissa"/> </figure> <h1> Atmospheric river – vesihöyryjoki </h1> <p> El Niño -vuosina varsinkin Yhdysvaltojen länsirannikolla otsikoihin saattaa nousta termi "atmospheric river". <span class="meta"> <time datetime="2015-08-20T16:13:03+03:00"> 20.8.2015 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/saasymbolit_ylen_tv-lahetyksissa/7756001"> <h1> Sääsymbolit Ylen tv-lähetyksissä </h1> <p> Sadetta vai paistetta? Mikä on violetti katkoviiva sääkartalla? Vastaus kysymyksiin löytyy täältä. <span class="meta"> <time datetime="2015-01-23T11:24:48+02:00"> 23.1.2015 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/saaennusteiden_aluejako/7751765"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakuvat/article7743444.ece/ALTERNATES/w120h68/19_1_SAA_aluejako_2.png" alt="Säägrafiikka: Aluejako sääennusteissa"/> </figure> <h1> Sääennusteiden aluejako </h1> <p> Sääennusteiden aluejako herättää usein keskustelua ja kysymyksiä. Mihin alueeseen esimerkiksi pääkaupunkiseutu kuuluu? Missä on maan keskiosa? <span class="meta"> <time datetime="2015-01-21T15:40:49+02:00"> 21.1.2015 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/mita_sataa_kun_tihuttaa/7530225"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7529798.ece/ALTERNATES/w120h68/Pisaroiden%20halkaisijoiden%20suhde%20toisiinsa" alt="Pisaroiden halkaisijoiden suhde toisiinsa"/> </figure> <h1> Mitä sataa kun tihuttaa? </h1> <p> Meteorologi puhuu poudasta, mutta ulkona on harmaata ja sateista. Tihkusadetta, vähäistä sadetta, sadetta vai poutaa, mistä tietää tarvitseeko sateenvarjoa? Sataako vai paistaako? <span class="meta"> <time datetime="2014-10-15T14:15:43+03:00"> 15.10.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/suomessa_vaivaa_ulkomainen_siitepoly/7230921"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/artikkelit/article7230446.ece/ALTERNATES/w120h68/Katsojakuva:%20Koivunurpu" alt="Katsojakuva: Koivunurpu"/> </figure> <h1> Suomessa vaivaa ulkomainen siitepöly </h1> <p> Siitepölymäärien arviointi on käsityötä <span class="meta"> <time datetime="2014-05-09T13:25:23+03:00"> 9.5.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/kasvukausi_aluillaan_etelaisilla_kasvuvyohykkeilla/7202930"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7202830.ece/ALTERNATES/w120h68/Valkovuokkoja%20Espoossa%2022.4.2014." alt="Valkovuokkoja Espoossa 22.4.2014."/> </figure> <h1> Kasvukausi aluillaan eteläisillä kasvuvyöhykkeillä </h1> <p> Kevään edetessä luonto näyttää heräämisen merkkejä ja viherpeukalot odottavat malttamattomina maan sulamista ja kasvukauden alkua. <span class="meta"> <time datetime="2014-04-23T14:40:50+03:00"> 23.4.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/pilvet_-_pumpulia_vetta_vai_jaata/7164747"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7164990.ece/ALTERNATES/w120h68/JyrkiLyytikk%C3%A42.png" alt="Kuvassa on kehittyvä sadekuuropilvi. Taustalla kirkas sininen taivas."/> </figure> <h1> Pilvet - pumpulia, vettä vai jäätä? </h1> <p> Säätoimitukseen tuli aikoinaan alle kouluikäisen lapsen kysymys siitä, miten pilvet syntyvät ja miten ihmeessä ne voivat leijua. Entä pystyykö niiden päällä istumaan? <span class="meta"> <time datetime="2014-03-31T13:52:02+03:00"> 31.3.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/auringon_ultraviolettisateily/7162934"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7162924.ece/ALTERNATES/w120h68/29_3_la_UV_sateily_talvella.png" alt="Lumi heijastaa lähes kaiken uv-säteilyn sekä valon."/> </figure> <h1> Auringon ultraviolettisäteily </h1> <p> Mitä paljon puhuttu UV-säteily on ja milloin ja missä säteily on voimakkaimmillaan? Miten auringon ultraviolettisäteily tulisi ottaa huomioon esimerkiksi kalareissulla tai Lapin keväthangilla? <span class="meta"> <time datetime="2014-03-29T09:48:09+02:00"> 29.3.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/auringon_kierto/7143060" class="autoplay "> <figure class="max-120"> <span class="media"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7143086.ece/ALTERNATES/w120h68/Videokuva" alt="Video: Videokuva"/> <span class="play"></span> <figcaption> <span class="basic-icon"> Video </span> </figcaption> </span> </figure> <h1> Auringon kierto </h1> <p> Pohjoisilla leveyksillä päivän pituus vaihtelee vuoden aikana talven kaamoksesta aina kesän yöttömään yöhön. <span class="meta"> <time datetime="2014-03-18T15:50:57+02:00"> 18.3.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/lampotilojen_vuorokausivaihtelu/7111952"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7111601.ece/ALTERNATES/w120h68/Kev%C3%A4ttalven%20aurinko" alt="Kevättalven aurinko"/> </figure> <h1> Lämpötilojen vuorokausivaihtelu </h1> <p> Kevättalven aurinkoisina päivinä lämpötilojen vaihtelu yön ja päivän välillä on suurimmillaan. <span class="meta"> <time datetime="2014-02-27T15:31:47+02:00"> 27.2.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/miten_sumu_syntyy/7109114"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7109553.ece/ALTERNATES/w120h68/Sumutyypit.jpg" alt="Sumut voidaan jakaa neljään eri luokkaan syntymekanisminsa perusteella: Säteilysumuihin, siirtymäsumuihin, haihtumissumuihin ja sekoitussumuihin"/> </figure> <h1> Miten sumu syntyy? </h1> <p> Sumu on mielenkiintoinen sääilmiö. Etenkin merialueilla sumu voi aiheuttaa jopa vaaratilanteita näkyvyyden ollessa erittäin huono. Toisaalta sumu voi luoda myös kauniita maisemia. Mitä sumu oikeastaan on ja miten tämä meteorologienkin mielestä haastava ilmiö syntyy? <span class="meta"> <time datetime="2014-02-26T15:14:57+02:00"> 26.2.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/pakkasen_purevuus/7021406"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7021390.ece/ALTERNATES/w120h68/Taulukko%20pakkasen%20purevuudesta" alt="Säägrafiikka: Taulukko pakkasen purevuudesta"/> </figure> <h1> Pakkasen purevuus </h1> <p> Pakkassäällä lämpömittarin lukema ei välttämättä kerro oikeaa tietoa siitä, kuinka kylmää oikeasti on. Tuuli lisää pakkasen tuntua huomattavasti, ja se onkin tärkeää ottaa huomioon myös pukeutumisessa. <span class="meta"> <time datetime="2014-01-09T11:26:25+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/fohn-tuuli/7021168"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7131052.ece/ALTERNATES/w120h68/F%C3%B6hn-tuuli" alt="Föhn-tuuli"/> </figure> <h1> Föhn-tuuli </h1> <p> Kevättalvella lämpötila voi joskus kohota yllättävän korkealle. Lämpimän ja aurinkoisen sään taustalla on usein ns. föhntuuli. . <span class="meta"> <time datetime="2014-01-09T11:21:09+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/miksi_meteorologi_ei_tervehdi_iltauutisten_yhteydessa/7021219"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7021212.ece/ALTERNATES/w120h68/Kuvakaappaus%20uutisl%C3%A4hetyksest%C3%A4" alt="Sääkuva: Kuvakaappaus uutislähetyksestä"/> </figure> <h1> Miksi meteorologi ei tervehdi iltauutisten yhteydessä? </h1> <p> Aika-ajoin meille säätoimitukseen tulee katsojilta ihmetteleviä kommentteja tai kysymyksiä iltauutisten käytännöistä. Meteorologihan ei illan uutisten yhteydessä toivota hyvää iltaa tai hyvästele säälähetyksen jälkeen. <span class="meta"> <time datetime="2014-01-09T10:39:38+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/pari_sanaa_varoituksista/7021209"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7021205.ece/ALTERNATES/w120h68/Esimerkkikartta%20s%C3%A4%C3%A4varoituksista" alt="Säägrafiikkaa: Esimerkkikartta säävaroituksista"/> </figure> <h1> Pari sanaa varoituksista </h1> <p> TV:n säälähetyksissä näytetään aika usein lähetyksen loppuun varoituskarttaa. Mitä ajankohtaa varoitukset koskevat ja kuinka usein varoituksia annetaan? Ja miksi tv:ssä näytettävät varoitukset vaikuttavat joskus ristiriitaisilta? <span class="meta"> <time datetime="2014-01-09T10:37:39+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/aluejako_saaennusteissa/7021199"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7021195.ece/ALTERNATES/w120h68/It%C3%A4-%20l%C3%A4nsisuuntainen%20aluejako%20s%C3%A4%C3%A4ennusteissa" alt="Säägrafiikkaa: Itä- länsisuuntainen aluejako sääennusteissa"/> </figure> <h1> Aluejako sääennusteissa </h1> <p> ”Odotettavissa huomisiltaan asti: Maan länsiosassa…” lienee tuttu ja monelle hämmentäväkin lause, joka usein säätiedotuksissa kuullaan. Minkälaisiin alueisiin Suomi on sääennusteissa oikein jaettu? <span class="meta"> <time datetime="2014-01-09T10:35:19+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/mita_tarkoittaa_matala-_tai_korkeapaine/7021178"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7130596.ece/ALTERNATES/w120h68/Matalapaineen%20havainnekuva" alt="Matalapaineen havainnekuva"/> </figure> <h1> Mitä tarkoittaa matala- tai korkeapaine? </h1> <p> Sääennusteissa puhutaan toistuvasti Suomea lähestyvän matalapaineen mukanaan tuomista sateista tai vastaavasti korkeapaineen myötä poutaantuvasta säästä. Mitä matalapaine, tai korkeapaine sitten oikeasti tarkoittaa? <span class="meta"> <time datetime="2014-01-09T10:31:02+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/entinen_oulun_laani/7021173"> <h1> Entinen Oulun lääni </h1> <p> Vuoden 2010 alussa Suomessa toteutettiin suuri aluehallinnon uudistus. Uudistuksessa entinen, vuodesta 1997 voimassa ollut, läänijako heitettiin romukoppaan. Nykyään ei siis enää ole olemassa läänejä. <span class="meta"> <time datetime="2014-01-09T10:28:46+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/kaakosta_saapuvien_matalapaineiden_ennustettavuus/7021164"> <h1> Kaakosta saapuvien matalapaineiden ennustettavuus </h1> <p> Sään ennustaminen perustuu nykyisin pitkälti tietokoneella laskettuihin numeerisiin ennusteisiin. Ilmakehämallien avulla jäljitellään ilmakehän toimintaa ja arvioidaan, kuinka sääilmiöt käyttäytyvät lähitulevaisuudessa. Ilmakehä on kuitenkin niin monimutkainen, että malleissa joudutaan tekemään yksinkertaistuksia. <span class="meta"> <time datetime="2014-01-09T10:26:45+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/voiko_sadetta_tehda/7021162"> <h1> Voiko sadetta tehdä? </h1> <p> Erityisesti 1950-luvulla sekä Yhdysvalloissa että silloisessa Neuvostoliitossa tutkittiin ihmisen mahdollisuuksia vaikuttaa keinotekoisesti säähän. Mielenkiinnon kohteena oli varsinkin sateen "tekeminen" kuivuudesta kärsiville alueille. <span class="meta"> <time datetime="2014-01-09T10:26:06+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/intiaanikesa/7021149"> <h1> Intiaanikesä </h1> <p> Jos esimerkiksi syyskuu on tavanomaista lämpimämpi, voidaanko puhua intiaanikesästä? <span class="meta"> <time datetime="2014-01-09T10:23:46+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/esiintyyko_suomessa_lumivyoryja/7021125"> <h1> Esiintyykö Suomessa lumivyöryjä? </h1> <p> Lumivyöryjä esiintyy Suomen Lapissa 0-20 kappaletta talvessa. Vuosittainen vaihtelu on hyvin suurta lumitilanteesta riippuen. Mitä enemmän on lunta, sitä suurempi on vyöryjen esiintymisen todennäköisyys. Suomessa lumivyöryjen esiintymisen todennäköisyyden ennustamisesta vastaa Ilmatieteen laitos. Ennusteita tehdään päivittäin kuuteen eri kohteeseen Lapin alueella. Havaintoja vyöryistä otetaan vastaan myös suurelta yleisöltä. <span class="meta"> <time datetime="2014-01-09T10:20:01+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/nao-indeksi/7021084"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7021097.ece/ALTERNATES/w120h68/Positiivinen%20NAO" alt="Säägrafiikkaa: Matala- ja korkeapaineet, kun NAO-indeksi on positiivinen"/> </figure> <h1> NAO-indeksi </h1> <p> Nao-indeksi vilahtelee uutisotsikoissa aika-ajoin. Mitä NAO tarkoittaa? <span class="meta"> <time datetime="2014-01-09T10:15:52+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/mita_tarkoittaa_terminen_kasvukausi/7021076"> <h1> Mitä tarkoittaa terminen kasvukausi? </h1> <p> Kevät etenee ja kasvukausi käynnistyy vähitellen myös pohjoisessa. Mitä tarkoittaa sääennustuksissakin esiintyvä "terminen kasvukausi" ja kuinka se määritellään? <span class="meta"> <time datetime="2014-01-09T10:08:52+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/merituuli/7021054"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7021059.ece/ALTERNATES/w120h68/Kaaviokuva%20merituulesta" alt="Säägrafiikkaa: Kaaviokuva merituulesta"/> </figure> <h1> Merituuli </h1> <p> Keväällä ja alkukesällä säätiedotuksissa puhutaan rannikkoa viilentävästä merituulesta. Mistä ilmiöstä on kyse ja kuinka merituuli oikein syntyy? <span class="meta"> <time datetime="2014-01-09T10:02:36+02:00"> 9.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/kuinka_ukkospilvi_syntyy/7016760"> <figure class="max-120"> <img src="https://web.archive.org/web/20211102051144im_/https://img.yle.fi/saa/saakysymykset/article7021408.ece/ALTERNATES/w120h68/Ukkospilven%20elinkaari" alt="Säägrafiikkaa: Ukkospilven elinkaari"/> </figure> <h1> Kuinka ukkospilvi syntyy? </h1> <p> Ukkonen on Suomen sääilmiöistä yksi näyttävimmistä ja voimakkaimmista. <span class="meta"> <time datetime="2014-01-08T13:33:35+02:00"> 8.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/kuinka_pitkalle_saata_voi_ennustaa/7016743"> <h1> Kuinka pitkälle säätä voi ennustaa? </h1> <p> Sääennusteiden luotettavuudesta ja osuvuudesta tulee usein kyselyitä meille meteorologeille. Vastauksen antaminen ei ole niin yksinkertaista, kuin ensi kuulemalta voisi luulla. Sääennusteita ja sääilmiöitä on nimittäin monenlaisia ja ennusteiden käyttökelpoisuus/luotettavuus vaihtelee eri ennusteiden ja tietenkin myös säätilan mukana. <span class="meta"> <time datetime="2014-01-08T13:24:26+02:00"> 8.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/saavaroituksista/7014883"> <h1> Säävaroituksista </h1> <p> Ylen säälähetykset päättyvät usein varsinaisten sääkarttojen jälkeen ruudulla näkyvään varoituskarttaan, mutta mitä ajankohtaa nuo varoitukset oikein tarkoittavat? <span class="meta"> <time datetime="2014-01-08T12:46:09+02:00"> 8.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/mista_revontulet_saavat_varinsa/7014925"> <h1> Mistä revontulet saavat värinsä? </h1> <p> Pohjoisen taivaalla leiskuvat revontulet ovat näyttävä luonnonilmiö, mutta miten revontulet syntyvät ja mistä ne saavat värinsä? <span class="meta"> <time datetime="2014-01-08T12:45:45+02:00"> 8.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/taivaalla_nayttaisi_olevan_kolme_aurinkoa_mika_valoilmio_on_kyseessa/7015097"> <h1> Taivaalla näyttäisi olevan kolme aurinkoa, mikä valoilmiö on kyseessä? </h1> <p> Kesäiset sateenkaaret lienevät useimmille meistä tutuimpia ilmakehän valoilmiöistä, mutta talvisaikaankin kannattaa katse kohottaa taivaalle. Tuolloin taivaalla voi nimittäin nähdä haloja. <span class="meta"> <time datetime="2014-01-08T12:45:11+02:00"> 8.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/mita_tarkoittaa_kastepiste/7015130"> <h1> Mitä tarkoittaa kastepiste? </h1> <p> Säähavaintojen yhteydessä ilmoitetaan usein lämpötilan ohella myös kastepistelämpötila. Kyseinen lämpötila liittyy nimensä mukaisesti ilman kosteuteen, eli vesihöyryn määrään ilmassa. <span class="meta"> <time datetime="2014-01-08T12:43:20+02:00"> 8.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/mita_tarkoittaa_ensilumi/7016357"> <h1> Mitä tarkoittaa ensilumi? </h1> <p> Kuinka ensilumi määritellään ja milloin lumi yleensä Suomeen sataa? <span class="meta"> <time datetime="2014-01-08T11:08:03+02:00"> 8.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/mita_tarkoittaa_saakartoilla_nakyva_kirjainyhdistelma_hpa/7016350"> <h1> Mitä tarkoittaa sääkartoilla näkyvä kirjainyhdistelmä hPa </h1> <p> Sääkartoilla näkyy aina silloin tällöin matala- ja korkeapaineen yhteydessä kirjainyhdistelmä hPa sekä vieressä numeroita. Mitä nuo tarkoittavat? <span class="meta"> <time datetime="2014-01-08T11:05:49+02:00"> 8.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/hallaa_vai_yopakkasta/7016343"> <h1> Hallaa vai yöpakkasta? </h1> <p> Näin kasvukauden aikaan sääennusteissa mainitaan silloin tällöin hallan tai yöpakkasen mahdollisuudesta. Mitä eroa hallalla ja yöpakkasella oikeastaan on? <span class="meta"> <time datetime="2014-01-08T11:02:07+02:00"> 8.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/jaatava_sade/7015071"> <h1> Jäätävä sade </h1> <p> Veden jäätymispiste on tavallisesti 0° Celsiusta. Sopivissa olosuhteissa vesipisaran lämpötila voi kuitenkin laskea nollan alapuolelle ilman että pisara jäätyy; tällöin veden sanotaan olevan alijäähtynyttä. <span class="meta"> <time datetime="2014-01-07T15:19:26+02:00"> 7.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/sademaarista/7015058"> <h1> Sademääristä </h1> <p> Sademäärä ilmoitetaan sääennusteissa millimetreinä, kuinka montaa senttimetriä lunta millimetri vettä vastaa? <span class="meta"> <time datetime="2014-01-07T15:15:29+02:00"> 7.1.2014 </time> </span> </p> </a> </article> <article> <a href="https://web.archive.org/web/20211102051144/https://yle.fi/saa/merkitseva_aallonkorkeus/7014911"> <h1> Merkitsevä aallonkorkeus </h1> <p> Mitä tarkoittaa merisääennusteiden yhteydessä usein mainittu merkitsevä aallonkorkeus? <span class="meta"> <time datetime="2014-01-07T14:19:09+02:00"> 7.1.2014 </time> </span> </p> </a> </article> <article> <a 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