Weather Whys: How does snow melt when the temperature is below freezing? (2024)

'); if(!WVM.IS_STREAMING){ $videoEl.append('' + '' + ''); } setTimeout(function(){ $('.mute-overlay').on('touchstart click', function(e){ if(e.handled === false) return; e.stopPropagation(); e.preventDefault(); e.handled = true; player.muted(false); //console.log("volumee " + WVM.activePlayer.volume()); $(this).hide(); $(this).css('display', 'none'); var currentTime = player.currentTime(); if(currentTime < 3){ player.currentTime(0); } var adsManager = player.ima.getAdsManager(); adsManager.setVolume(player.volume()); }); $('.video-close-floating').on('click', function(){ WVM['player_state' + videoId]['CANCEL_FLOATING'] = true; WVM.IS_FLOATING = false; $('#media-container-' + videoId).css('width', "100%"); $('#media-container-' + videoId).removeClass('floating-video'); $('#media-placeholder-' + videoId).css('display', 'none'); player.pause(); player.ima.getAdsManager().pause(); }); if(hideClose){ setTimeout(function(){ $('.video-close-floating').css('display', 'none'); $('.video-close-floating').remove(); }, 500); } }, 500); } else{ //wait 500 sec call again setTimeout(function(){ WVM.addMuteButton(videoId, player, hideClose); }, 500); } }; WVM.addFloatingAbility = function(videoId, player){ var deviceName = 'desktop'; if($('#media-container-' + videoId).length > 0){ if(deviceName == 'desktop'){ WVM.VIDEO_TOP = $('#media-container-' + videoId).offset().top; }else{ WVM.VIDEO_TOP = $('#media-container-' + videoId).offset().top - $('.next-dropdown-accordion').height(); } if(deviceName == 'desktop'){ WVM.VIDEO_HEIGHT = $('#html5-video-' + videoId).outerHeight(); }else{ WVM.VIDEO_HEIGHT = $('#html5-video-' + videoId).outerHeight(); } WVM.CONTAINER_HEIGHT = $('#media-container-' + videoId).height(); //console.log("container height: " + WVM.CONTAINER_HEIGHT); $(window).on( "resize", function() { if(deviceName == 'desktop'){ WVM.VIDEO_TOP = $('#media-container-' + videoId).offset().top; }else{ WVM.VIDEO_TOP = $('#media-container-' + videoId).offset().top - $('.next-dropdown-accordion').height(); } if(deviceName == 'desktop'){ WVM.VIDEO_HEIGHT = $('#html5-video-' + videoId).outerHeight(); }else{ WVM.VIDEO_HEIGHT = $('#html5-video-' + videoId).outerHeight(); } WVM.CONTAINER_HEIGHT = $('#media-container-' + videoId).height(); console.log("container height: " + WVM.CONTAINER_HEIGHT); }); //console.log("VIDEOTOP: " + WVM.VIDEO_TOP); //console.log("VIDEOHEIGHT: " + WVM.VIDEO_HEIGHT); $(window).on( "scroll", function() { if(!WVM.IS_FLOATING){ if(deviceName == 'desktop'){ WVM.CONTAINER_HEIGHT = $('#media-container-' + videoId).height(); }else{ WVM.CONTAINER_HEIGHT = $('#media-container-' + videoId + " .hlsvideo-wrapper").height() + $('#media-container-' + videoId + " .now-playing-container").height(); } } //var top = $('#media-container-' + videoId).offset().top; var offset = WVM.VIDEO_TOP + (WVM.VIDEO_HEIGHT / 2); var offsetBack = WVM.VIDEO_TOP; var changed = false; //console.log("VIDEOTOP: " + WVM.VIDEO_TOP); //console.log("VIDEOHEIGHT: " + WVM.VIDEO_HEIGHT); //console.log("scrolltop " + $(window).scrollTop()); //only float if playing var isPlaying = WVM['player_state' + videoId]['IS_PLAYING'] || WVM['player_state' + videoId]['AD_IS_PLAYING']; if(isPlaying){ $('.vjs-loading-spinner').hide(); } var offsetFloatAd = 99999999; if(deviceName == 'desktop' && $('#float_anchor').length > 0){ offsetFloatAd = $('#float_anchor').offset().top - WVM.VIDEO_HEIGHT; //console.log("float anchor offset top " + offsetFloatAd); } if($(window).scrollTop() > offset && isPlaying && !WVM['player_state' + videoId]['CANCEL_FLOATING']){ $('#media-placeholder-' + videoId).height(WVM.CONTAINER_HEIGHT); $('#media-placeholder-' + videoId).css('display', 'block'); if(!WVM.IS_FLOATING){ changed = true; } WVM.IS_FLOATING = true; $('#media-container-' + videoId).addClass('floating-video'); var sWidth = window.innerWidth || document.documentElement.clientWidth; var sHeight = window.innerHeight || document.documentElement.clientHeight; if(sWidth > 900 && WADS.IS_STICKING){ $('#media-container-' + videoId).addClass('desktop-ad-is-sticky'); } else if(WADS.IS_STICKING){ if(!WADS.TOP_AD_VIEWED){ $('#media-container-' + videoId).addClass('mobile-ad-is-sticky'); }else{ $('#media-container-' + videoId).addClass('mobile-ad-is-sticky-noad'); } } else if(!WADS.IS_STICKING){ if(!WADS.TOP_AD_VIEWED){ $('#media-container-' + videoId).removeClass('desktop-ad-is-sticky'); }else{ $('#media-container-' + videoId).addClass('desktop-ad-is-sticky-noad'); } } //set right var sWidth = window.innerWidth || document.documentElement.clientWidth; var sHeight = window.innerHeight || document.documentElement.clientHeight; if(deviceName == 'desktop' || sWidth > 900){ var leftPos2 = $('aside').get(0).getBoundingClientRect().left; var leftPos = $('aside').offset().left ; $('#media-container-' + videoId).css('left', leftPos + "px"); var newWidth = Math.floor(sWidth / 3.5); $('#media-container-' + videoId).css('width', newWidth + "px"); } else{ $('#media-container-' + videoId).css('width', "100% !important"); $('#media-container-' + videoId + ' .now-playing-container').css('display', 'block'); $('#media-container-' + videoId + ' .next-dropdown-accordion').css('display', 'block'); } //floating-video $('#media-container-' + videoId + " " + '.page-carousel-wrapper').hide(); setTimeout(function(){ var hWrapper = $('.floating-video .hlsvideo-wrapper').height(); var npWidth = $('.floating-video .now-playing-container').height(); var ndWidth = $('.floating-video .next-dropdown-header').height() + 20; var scrollerHeight = sHeight - (hWrapper + npWidth + ndWidth); scrollerHeight = 180; //scrollerHeight = parseInt(scrollerHeight * 0.5); if(WVM.device_name == 'desktop'){ $('#media-container-' + videoId + " " + " .mobile-list-videos").height(scrollerHeight); } }, 100); }else if($(window).scrollTop() < offsetBack){ if(WVM.IS_FLOATING){ changed = true; } WVM.IS_FLOATING = false; $('#media-container-' + videoId).css('width', "100%"); $('#media-container-' + videoId).removeClass('floating-video'); $('#media-placeholder-' + videoId).css('display', 'none'); $('#media-container-' + videoId + ' .now-playing-container').css('display', 'block'); } if($('#next-dropdown-accordion-button-' + videoId).find('i').hasClass('fa-chevron-up')){ //console.log("show it"); if(deviceName == "desktop" && !$('#media-container-' + videoId).hasClass('floating-video')){ $('#media-container-' + videoId + " " + '.page-carousel-wrapper').show(); $('#media-container-' + videoId + " " + '.mobile-list-wrapper').hide(); //console.log("showing desktop"); if(!WVM.player_state116150['CAROUSEL_INIT']){ WVM.setupCarousel(videoId); } }else{ if(changed){ //default closed for mobile/floating player $('#next-dropdown-accordion-button-' + videoId).find('i').removeClass('fa-chevron-up'); $('#next-dropdown-accordion-button-' + videoId).find('i').addClass('fa-chevron-down'); $('#media-container-' + videoId + " " + '.page-carousel-wrapper').hide(); $('#media-container-' + videoId + " " + '.mobile-list-wrapper').hide(); var currVideoId = WVM['player_state' + videoId]['VIDEO_ID']; var nextVideoId = WVM.getNextPlaylistIndex(currVideoId); var myTitle = WVM.getPlaylistData(videoId, currVideoId, 'noprefixtitle'); $('#video-slider-nexttitle' + videoId).css('display', 'inline'); $('#video-slider-nexttitle' + videoId).html(myTitle); }else{ $('#media-container-' + videoId + " " + '.page-carousel-wrapper').hide(); $('#media-container-' + videoId + " " + '.mobile-list-wrapper').show(); } } }else{ $('#media-container-' + videoId + " " + '.page-carousel-wrapper').hide(); $('#media-container-' + videoId + " " + '.mobile-list-wrapper').hide(); } } ); $('#media-container-' + videoId + ' .video-close').on('click',function(){ //set back to paused and stop floating WVM['player_state' + videoId]['CANCEL_FLOATING'] = true; WVM.IS_FLOATING = false; $('#media-container-' + videoId).css('width', "100%"); $('#media-container-' + videoId).removeClass('floating-video'); $('#media-placeholder-' + videoId).css('display', 'none'); player.pause(); player.ima.getAdsManager().pause(); //$(".now-playing-container").fadeOut(100); //$(".mobile-flexbox-video-splitter").addClass("full-width"); }); } }; WVM.setupCarousel = function(fullVideoId, player){ // initialize Masonry after all images have loaded //alert("setting up carousel"); $('#page-carousel-' + fullVideoId).css('display', 'block'); WVM['player_state' + fullVideoId]['CAROUSEL_INIT'] = true; if($('#page-carousel-' + fullVideoId).length > 0){ var container = document.querySelector('#page-carousel-' + fullVideoId); imagesLoaded( container, function() { var screenWidth = window.innerWidth || document.documentElement.clientWidth; if(screenWidth > 850){ WVM.IS_DESKTOP = true; $('#page-carousel-' + fullVideoId + ' .page-carousel-lg-slides').css('display', 'block'); WVM['player_settings' + fullVideoId].slider = $('#page-carousel-' + fullVideoId).bxSlider({ maxSlides: 4, minSlides: 4, slideWidth: 305, infiniteLoop: false, hideControlOnEnd: true, useCSS: true, pager: false, slideMargin: 15, moveSlides: 1, nextText: '', prevText: '' }); }else{ WVM.IS_DESKTOP = false; $('.page-carousel-wrapper').css('display', 'block'); } }); } }; WVM.setupToggleButton = function(fullVideoId, player){ if($('.nextplay-switch-' + fullVideoId).length > 0){ new DG.OnOffSwitchAuto({ cls:'.nextplay-switch-' + fullVideoId, height: 24, trackColorOn:'#F9F9F9', trackColorOff:'#222', textColorOn: '#222', textColorOff: '#222', textOn:'On', textOff:'Off', listener:function(name, checked){ var theVal = 1; if(!checked){ theVal = 0; } $.ajax({ url: '/ajax/update_autoplay_video/', data: { autoplay_on: theVal }, type: 'POST', dataType: 'json', success: function(data) { WVM['player_settings' + fullVideoId]['autoplay'] = checked; }, error : function(){ console.log("Error loading video"); } }); } }); } }; WVM.setupAccordionButton = function(fullVideoId){ var deviceName = 'desktop'; $('#next-dropdown-accordion-button-' + fullVideoId).on('click', function(){ if($(this).find('i').hasClass('fa-chevron-up')){ //hide $(this).find('i').removeClass('fa-chevron-up'); $(this).find('i').addClass('fa-chevron-down'); if(deviceName == "desktop" && !$('#media-container-' + fullVideoId).hasClass('floating-video')){ $('#media-container-' + fullVideoId + " " + '.page-carousel-wrapper').slideUp(); $('#media-container-' + fullVideoId + " " + '.mobile-list-wrapper').hide(); }else{ $('#media-container-' + fullVideoId + " " + '.mobile-list-wrapper').slideUp(); $('#media-container-' + fullVideoId + " " + '.page-carousel-wrapper').hide(); } var currVideoId = WVM['player_state' + fullVideoId]['VIDEO_ID']; var nextVideoId = WVM.getNextPlaylistIndex(currVideoId); //playerId, mediaId, fieldName var myTitle = WVM.getPlaylistData(fullVideoId, nextVideoId, 'noprefixtitle'); //alert("Getting title " + myTitle); $('#video-slider-nexttitle' + fullVideoId).css('display', 'inline'); $('#video-slider-nexttitle' + fullVideoId).html(myTitle); }else{ //expand $(this).find('i').addClass('fa-chevron-up'); $(this).find('i').removeClass('fa-chevron-down'); $('#media-container-' + fullVideoId + " " + '.mobile-list-wrapper').css('display', 'block'); if(deviceName == "desktop" && !$('#media-container-' + fullVideoId).hasClass('floating-video')){ $('#media-container-' + fullVideoId + " " + '.page-carousel-wrapper').css('display', 'block'); $('#media-container-' + fullVideoId + " " + '.page-carousel-wrapper').slideDown(); $('#media-container-' + fullVideoId + " " + '.mobile-list-wrapper').hide(); if(!WVM.player_state116150['CAROUSEL_INIT']){ WVM.setupCarousel(fullVideoId); } }else{ $('#media-container-' + fullVideoId + " " + '.mobile-list-wrapper').slideDown(); $('#media-container-' + fullVideoId + " " + '.page-carousel-wrapper').hide(); if(!$('#media-container-' + fullVideoId).hasClass('floating-video')){ if(!WVM.player_state116150['CAROUSEL_INIT']){ WVM.setupCarousel(fullVideoId); } } } $('#video-slider-nexttitle' + fullVideoId).css('display', 'none'); } }); var currVideoId = WVM['player_state' + fullVideoId]['VIDEO_ID']; //console.log("current Video " + currVideoId); var nextVideoId = WVM.getNextPlaylistIndex(currVideoId); var myTitle = WVM.getPlaylistData(fullVideoId, nextVideoId, 'noprefixtitle'); //console.log("setting title " + myTitle); $('#video-slider-nexttitle' + fullVideoId).css('display', 'inline'); $('#video-slider-nexttitle' + fullVideoId).html(myTitle); }; WVM.sendbeacon = function(action, nonInteraction, value, eventLabel) { var eventCategory = 'Video'; if (window.ga) { //console.log("sending action: " + action + " val: " + value + " label " + eventLabel); ga('send', 'event', { 'eventCategory': eventCategory, 'eventAction': action, 'eventLabel': eventLabel, 'eventValue': value, 'nonInteraction': nonInteraction }); } }; WVM.getNextPlaylistIndex = function(mediaId, returnArrayIndex){ var currId = null; if(mediaId == null){ return null; } for(var x =0; x < WVM.playlist_ids.length; x++){ var myMediaId = WVM.playlist_ids[x]; if(myMediaId == mediaId){ currId = myMediaId; break; } } var nextId = x + 1; if(nextId < WVM.playlist_ids.length && currId !== null){ if(!returnArrayIndex){ return WVM.playlist_ids[nextId]; }else{ return nextId; } } return null; }; WVM.getPlaylistArrayId = function(mediaId){ for(var x =0; x < WVM.playlist_ids.length; x++){ var myMediaId = WVM.playlist_ids[x]; if(myMediaId == mediaId){ return x; } } return null; }; //unimportant stuff like tracking... don't put anything platform specific here WVM.finishPlayer = function(player, playerState, playerSettings){ var percentsPlayedInterval = 25; //player.off('loadedmetadata'); player.on('loadedmetadata', function(){ if(playerState.PLAYER_META){ return; } playerState.PLAYER_META = true; WVM.sendbeacon("loadedmetadata", true, playerState.VIDEO_ID, playerState.VIDEO_TITLE); }); //player.off('ready'); player.on('ready', function(){ playerState.PLAYER_READY = true; }); //player.off(['waiting', 'pause']); player.on(['waiting', 'pause'], function() { playerState.IS_PLAYING = false; $('.vjs-loading-spinner').removeClass('badspinner'); setTimeout(function(){ //let it spin for 3 sec at most $('.vjs-loading-spinner').addClass('badspinner'); }, 3000); }); //player.off('playing'); player.on('playing', function() { console.log('playing'); }); //player.off('adstart'); player.on('adstart', function(){ console.log("starting ads"); WVM.lastAdRequest = new Date().getTime() / 1000; playerState.AD_IS_PLAYING = true; playerState.PLAYED_AD = true; WVM.sendbeacon("adstart", true, playerState.VIDEO_ID, playerState.VIDEO_TITLE); //make sure player is at start, paused player.pause(); player.currentTime(0); }); //player.off('adend'); player.on('adend', function(){ var playPromise = null; console.log("ad end"); playerState.AD_IS_PLAYING = false; setTimeout(function(){ if(!playerState.IS_PLAYING || player.paused()){ } }, 500); WVM.lastAdRequest = new Date().getTime() / 1000; WVM.sendbeacon("adend", true, playerState.VIDEO_ID, playerState.VIDEO_TITLE); }); //player.off('timeupdate'); player.on('timeupdate', function(){ playerState.IS_PLAYING = true; var fullDuration = this.duration() * 1000; var fullCurrent = this.currentTime() * 1000; var rand = parseInt(Math.random() * 100); //console.log("timeupdate " + fullCurrent + " out of " + fullDuration); if(rand > 20){ if(fullDuration > 1 && ((fullDuration - fullCurrent) > 1) && !$('.vjs-loading-spinner').hasClass('badspinner')){ console.log("hiding spinner"); $('.vjs-loading-spinner').addClass('badspinner'); } } var duration_time = Math.floor(this.duration()); //this is a hack because the end video event is not firing... var current_time = Math.floor(this.currentTime()); if ( current_time > 0 && ( fullCurrent >= (fullDuration - 10) )){ var currId = playerState.VIDEO_ID; var newMediaId = WVM.getNextPlaylistIndex(currId); //if(playerSettings.autoplay_next && newMediaId){ if(newMediaId){ if('desktop' == "iphone" && playerState.AD_ERROR){ console.log("skipped timeupdate end"); }else{ WVM.load_video(newMediaId, true, playerState.ORIGINAL_ID); } } } if(!playerState.START_SENT){ WVM.sendbeacon('start', true, playerState.VIDEO_ID, playerState.VIDEO_TITLE); playerState.START_SENT = true; } var currentTime, duration, percent, percentPlayed, _i; currentTime = Math.round(this.currentTime()); duration = Math.round(this.duration()); percentPlayed = Math.round(currentTime / duration * 100); for (percent = _i = 0; _i <= 99; percent = _i += percentsPlayedInterval) { if (percentPlayed >= percent && __indexOf.call(playerState['PERCENTS_TRACKED'], percent) < 0) { if (percentPlayed !== 0) { WVM.sendbeacon('percent-' + percent, true, playerState.VIDEO_ID, playerState.VIDEO_TITLE); } if (percentPlayed > 0) { playerState['PERCENTS_TRACKED'].push(percent); } } } }); //player.off('ended'); player.on('ended', function(){ console.log("ended"); playerState.IS_PLAYING = false; WVM.sendbeacon("complete", true, playerState.VIDEO_ID, playerState.VIDEO_TITLE); var currId = playerState.VIDEO_ID; var newMediaId = WVM.getNextPlaylistIndex(currId); //if(playerSettings.autoplay_next && newMediaId){ if(newMediaId){ WVM.load_video(newMediaId, true, playerState.ORIGINAL_ID); }else{ console.log("Playlist complete (no more videos)"); } }); //player.off('adserror'); player.on('adserror', function(e){ //$('#ima-ad-container').remove(); WVM.lastAdRequest = new Date().getTime() / 1000; console.log(e); console.log("ads error"); var errMessage = e['data']['AdError']['l']; playerState.AD_IS_PLAYING = false; playerState.IS_PLAYING = false; // && errMessage == 'The VAST response document is empty.' if(!playerState.AD_ERROR){ var dTime = new Date().getTime(); WVM.firstPrerollTagUrl = WVM.getFirstPrerollUrl(); console.log("calling backup ad tag url: " + WVM.firstPrerollTagUrl); WVM.activePlayer.ima.changeAdTag(WVM.firstPrerollTagUrl + "?" + dTime); WVM.activePlayer.ima.requestAds(); //WVM.activePlayer.src({ // src: masterSrc, // type: 'video/mp4' //}); //WVM.firstPrerollTagUrl = ""; } playerState.AD_ERROR = true; }); //player.off('error'); player.on('error', function(event) { if (player.error().code === 4) { player.error(null); // clear out the old error player.options().sources.shift(); // drop the highest precedence source console.log("now doing src"); console.log(player.options().sources[0]); player.src(player.options().sources[0]); // retry return; } }); //player.off('volumechange'); player.on('volumechange', function(event) { console.log(event); var theHeight = $('#media-container-' + playerState.ORIGINAL_ID + ' .vjs-volume-level').css('height'); var cssVolume = 0; if(theHeight){ cssVolume = parseInt(theHeight.replace('%', '')); } var theVolume = player.volume(); if(theVolume > 0.0 || cssVolume > 0){ $('#media-container-' + playerState.ORIGINAL_ID + ' .mute-overlay').css('display', 'none'); }else{ $('#media-container-' + playerState.ORIGINAL_ID + ' .mute-overlay').css('display', 'block'); } }); WVM.reinitRawEvents(playerState.ORIGINAL_ID); setInterval(function(){ WVM.reinitRawEvents(playerState.ORIGINAL_ID); }, 2000); } if(!WVM.rawCompleteEvent){ WVM.rawCompleteEvent = function(e){ var playerState = WVM['player_state116150']; }; } if(!WVM.rawTimeupdateEvent){ WVM.rawTimeupdateEvent = function(e){ var playerState = WVM['player_state116150']; var rawVideoElem = document.getElementById('html5-video-' + playerState['ORIGINAL_ID'] + '_html5_api'); var fullCurrent = rawVideoElem.currentTime * 1000; var fullDuration = rawVideoElem.duration * 1000; var current_time = Math.floor(rawVideoElem.currentTime); console.log("raw timeupdate: " + fullCurrent + " out of " + fullDuration); if ( current_time > 0 && ( fullCurrent >= (fullDuration - 50) )){ var currId = playerState.VIDEO_ID; var newMediaId = WVM.getNextPlaylistIndex(currId); if(newMediaId){ console.log("loading new video from rawtimeupdate"); WVM.load_video(newMediaId, true, playerState.ORIGINAL_ID); } } if(!$('.vjs-loading-spinner').hasClass('badspinner')){ $('.vjs-loading-spinner').addClass('badspinner') } }; } WVM.reinitRawEvents = function(playerId){ var playerState = WVM['player_state' + playerId]; var rawVideoElem = document.getElementById('html5-video-' + WVM['player_state' + playerId]['ORIGINAL_ID'] + '_html5_api'); //COMPLETE EENT if( WVM['player_state' + playerId].COMPLETE_EVENT){ rawVideoElem.removeEventListener('ended', WVM.rawCompleteEvent, false); } rawVideoElem.addEventListener('ended', WVM.rawCompleteEvent, false); //TIME UPDATE EVENT if( WVM['player_state' + playerId].TIMEUPDATE_EVENT){ rawVideoElem.removeEventListener('ended', WVM.rawTimeupdateEvent, false); } rawVideoElem.addEventListener('ended', WVM.rawTimeupdateEvent, false); WVM['player_state' + playerId].COMPLETE_EVENT = true; WVM['player_state' + playerId].TIMEUPDATE_EVENT = true; };

We are in the heart of a deep blast of cold air right now with temps below-zero for some and wind chills as cold as -20. The sunshine makes a difference with your spirit but can also make a difference on snow melting. In today's Weather Whys Megan asks, "How can snow melt when the temperature is below 32°?"

The air temperature rises and falls due to a combination of wind, sunshine and cloud cover. As the sun emerges in the morning it's energy warms the air causing the temperature to rise. Even when the temperature of the air doesn't reach 32° the sun can still warm the ground, snow, dirt, homes, etc. to 32°. When that happens the snow or ice will still melt even if the air temperature doesn't reach freezing.

It's all about the sun angle this time of year. The higher the sun angle, the more direct sunlight we get and the warmer the temperature rises. At the start of winter the sun angle is only 27° which is why we get so cold in December and January. By today's date the sun angle rises to 36° and by the start of spring the sun angle is at 47°. So even though it might be cold, the sun is still doing it's work warming the ground a melting some snow.

Weather Whys is a segment by Meteorologist Justin Thompson-Gee that airs during the CBS 58 News on WMLW - The M from 7 a.m. to 8 a.m. The segment answers viewer weather questions, explains weather phenomena and reveals interesting weather stats. To submit your question reach out to Justin on Facebook, Twitter or by emailing him at [emailprotected].