KMI - Today's UV index at Uccle

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href="/research-themes/ozone/introduction">Ozone in the atmosphere</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/the-ozone-hole">The ozone hole</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/measuringozone">Measuring ozone</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/instrumental-research">Ozone measurements at Uccle</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/longtermtrendsuccle">Long-term ozone trends at Uccle</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/50-years-of-ozone-measurements-at-uccle">50 years of ozonesonde measurements at Uccle</a> </li> </ul> </li> <li id="subnav-5571" class="sidebar-nav__list__item sidebar-nav__list__item--active sidebar-nav__list__item--open sidebar-nav__list__item--sublist"> <a href="/research-themes/uv"> Ultraviolet (UV) radiation </a> <ul class="sidebar-nav__list__item__sublist"> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/uv/what-is-the-uv-index">What is the UV index?</a> </li> <li class="sidebar-nav__list__item__sublist__item sidebar-nav__list__item__sublist__item--active"> <a href="/research-themes/uv/todays-uv-index-at-uccle">Today's UV index at Uccle</a> </li> </ul> </li> <li id="subnav-5447" class="sidebar-nav__list__item sidebar-nav__list__item--sublist"> <a href="/research-themes/aerosols"> Aerosols </a> <ul class="sidebar-nav__list__item__sublist"> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/aerosols/what-are-the-effects-of-aerosols">Why investigate aerosol particles?</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/aerosols/measurements-of-atmospheric-aerosol-particles">Measurements of atmospheric aerosol particles</a> </li> </ul> </li> <li id="subnav-5574" class="sidebar-nav__list__item sidebar-nav__list__item--sublist"> <a href="/research-themes/water-vapour"> Water vapour </a> <ul class="sidebar-nav__list__item__sublist"> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/water-vapour/total-column-water-vapour">Total column water vapour</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/water-vapour/iwv-intercomparisons">IWV intercomparisons</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/water-vapour/fog">Radiation fog</a> </li> </ul> </li> <li id="subnav-5575" class="sidebar-nav__list__item sidebar-nav__list__item--sublist"> <a href="/research-themes/atmospheric-modelling"> Atmospheric modelling </a> <ul class="sidebar-nav__list__item__sublist"> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/atmospheric-modelling/biogenic-modelling">Airborne allergenic pollen modelling</a> </li> </ul> </li> <li id="subnav-5739" class="sidebar-nav__list__item "> <a href="/research-themes/atmospheric-profiling"> Atmospheric profiling </a> </li> </ul> </nav> </div> </div> <div class="col-md-9 sub-page__content"> <div class="box box--content"> <h2 class="box__title">Today's UV index at Uccle</h2> <div class="esi-pp"> <div> <script src="/services/web2016/resources/lib/js/highcharts.js"></script> <script src="/services/web2016/resources/lib/js/highcharts-more.js"></script> <script src="/services/web2016/resources/lib/js/highcharts-multicolor_series.js"></script> <script src="/services/web2016/resources/lib/js/exporting.js"></script> <script src="/services/web2016/resources/lib/js/moment-with-locales.min.js"></script> <script src="/services/web2016/resources/lib/js/moment-timezone-with-data.min.js"></script> <script>var hours_symbol = {'nl': 'u.', 'fr': 'h', 'en': 'h', 'de': 'U.'}; function formatShortHour(date, lang) { lang = lang || 'en' ; var m = moment(date).tz("Europe/Brussels"); 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if(lang == 'nl') { result += ' ' + m.format('HH') + '.' + m.format('mm') + ' u'; } else if(lang == 'de') { result += ' ' + m.format('HH:mm') + ' Uhr' ; } else { result += ' ' + m.format('H:mm'); } } return result ; }</script> <div id="graph-uv-container" style="min-width: 310px; max-width: 750px; height: 450px; margin: 0 auto"></div> <script> function hexToRgbAString(hex, transparency = 1){ var c; if(/^#([A-Fa-f0-9]{3}){1,2}$/.test(hex)){ c= hex.substring(1).split(''); if(c.length== 3){ c= [c[0], c[0], c[1], c[1], c[2], c[2]]; } c= '0x'+c.join(''); return 'rgba('+[(c>>16)&255, (c>>8)&255, c&255].join(',')+',' + transparency + ')'; } throw new Error('Bad Hex "' + hex + '"'); } function getLevelColor(uv) { var data = [ [1, '#4EB400'], [2, "#A0CE00"], [3, "#F7E400"], [4, "#F8B600"], [5, "#F88700"], [6, "#F85900"], [7, "#E82C0E"], [8, "#D8001D"], [9, "#FF0099"], [10, "#B54CFF"], [99, '#998CFF'], ]; for(var i = 0, l = data.length ; i < l ; ++i) { if( (uv <= data[i][0]) || (i == l-1) ) { return data[i][1] ; } } } function getLevelDescription(uv) { var data = [ [2, "Low"] , [5, "Moderate"] , [7, "High"] , [10,"Very High"] , [25, "Extreme"] ]; for(var i = 0, l = data.length ; i < l ; ++i) { if( (uv <= data[i][0]) || (i == l-1) ) { return data[i][1] ; } } } function formatLevel(uv) { //return '<span style="color: ' + getLevelColor(uv) + '">' + uv + '</span>' ; return uv ; } var language = 'en' ; moment.locale(language); Highcharts.setOptions({chart: {style: {fontFamily: 'Lato,Helvetica,Arial,sans-serif'}}}); var obs_data = 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; var maxUvLevel = 10 ; var series = [] ; var fc = [] ; for(var i = 0, len = fc_data.length ; i < len ; ++i) { var d = new Date(fc_data[i]['UNIX_TIMESTAMP']*1000); var value = fc_data[i]['UV_INDEX']; fc.push( {x: d.getTime(), y: value} ); if(value > maxUvLevel) maxUvLevel = value ; } var serie_fc = { name: "Forecasted UV-index with clear sky (upper bound)" , type: 'spline' , data: fc , color: 'rgba(211,211,211, 0.8)' , id: 'forecast' , marker: { enabled: false , symbol: 'circle' , radius: 2 } } var fc_bkg = [] ; for(var i = 0 ; i < fc.length ; ++i) { var item = { x: fc[i].x , y: fc[i].y , segmentColor: hexToRgbAString(getLevelColor(fc[i].y), 0.33) }; fc_bkg.push(item); } var serie_fc_bkg = { name: "fc_background" , data: fc_bkg , color: 'rgba(211,211,211, 0.5)' , type: 'coloredarea' , marker: { enabled: false } , linkedTo: 'forecast' }; series.push(serie_fc_bkg); var obs = []; for(var i = 0, len = obs_data.length ; i < len ; ++i) { var d = new Date(obs_data[i]['UNIX_TIMESTAMP']*1000); var value = obs_data[i]['UV_INDEX']; obs.push( {x: d.getTime(), y: value} ); if(value > maxUvLevel) maxUvLevel = value ; } var serie_obs = { name: "Effective UV Index at Uccle" , data: obs , id: 'obs' , type: 'line' , color: '#000000' , marker: { enabled: true , symbol: 'diamond' , radius: 4 } }; var obs_bkg = [] ; for(var i = 0 ; i < (obs.length-1) ; ++i) { for(var step = 0 ; step < (obs[i+1].x-obs[i].x) ; step += (1000*60) ) { var ts = (obs[i].x + step); var ratio = (ts - obs[i].x)/(obs[i+1].x-obs[i].x); var value = (obs[i].y + ratio * (obs[i+1].y - obs[i].y)); var item = { x: ts , y: value , segmentColor: hexToRgbAString(getLevelColor(value), 1.0) }; obs_bkg.push(item); } } var serie_obs_bkg = { name: "obs_background" , data: obs_bkg , type: 'coloredarea' , color: '#000000' , marker: { enabled: false } , enableMouseTracking: false , linkedTo: 'obs' }; series.push(serie_obs_bkg); series.push(serie_obs); series.push(serie_fc); var tickPositions = [0,2,5,7,10] ; var plotBands = [ { from: 0 , to: 2 //, color: 'rgba(153, 204, 0, 0.1)' , label: { text: "Low" , style: { color: 'lightgray' } } } , { from: 2 , to: 5 //, color: 'rgba(255, 204, 0, 0.1)' , label: { text: "Moderate" , style: { color: 'lightgray' } } } , { from: 5 , to: 7 //, color: 'rgba(255, 102, 0, 0.1)' , label: { text: "High" , style: { color: 'lightgray' } } } , { from: 7 , to: 10 //, color: 'rgba(255, 51, 0, 0.1)' , label: { text: "Very High" , style: { color: 'lightgray' } } } ]; if(maxUvLevel > 10) { tickPositions.push(Math.round(maxUvLevel)+1); plotBands.push({ from: 10 , to: 25 //, color: 'rgba(255, 51, 0, 0.1)' , label: { text: "Extreme" , style: { color: 'lightgray' } } }); } Highcharts.chart('graph-uv-container', { chart: { events: { load: function(event) { this.renderer.image('https://www.meteo.be/gfx/Logos/IndexRMI.gif',10,0,30,40).add(); } } } ,title: { text: "Effective UV Index at Uccle" , style: {fontSize: "1.33em"} } , xAxis: { type: 'datetime' , tickInterval: (1000*60*60) , labels:{ useHTML: true , formatter: function() { var date = new Date(this.value); var dateLabel = formatShortHour(date, language); return dateLabel ; } } , plotLines:[{ value: (new Date()).getTime() , color: 'darkgray' , width: 1 , dashStyle: 'solid' }] } , yAxis: { title: { text: "UV-Index" , style: {fontSize: "1.25em"} } , min: 0 , softMax: 10 , tickPositions: tickPositions , plotBands: plotBands } , tooltip: { crosshairs: true , shared: true , useHTML: true , formatter: function(){ var result = '' ; for(var i = 0 ; i < this.points.length ; ++i) { if(!this.points[i]) continue ; if(this.points[i].series.name == 'obs_background') continue ; if(this.points[i].series.name == 'fc_background') continue ; var obsLabel = null ; obsLabel = '<div style="display:inline-block; border-radius: 50%;width:10px;height:10px;background:' + this.points[i].series.color + ';" ></div><div style="display:inline-block;padding-left: 3px;">' + this.points[i].series.name + ': <b>' + formatLevel(this.points[i].y) + '</b> (' + getLevelDescription(this.points[i].y) + ')</div></div>'; result += '<br />' + obsLabel ; } if(result != '') { var date = new Date(this.x); result = formatFullDate(date, language) + '<br />' + result ; return result ; } else return false; } } , credits: { enabled: false } , series: series }); </script> </div> </div> <div class="text-pp"> <p><strong>The graph shows the forecasted and measured UV index at Uccle for today.</strong> The forecast is based on a model with the ephemerides and the ozone column as main input parameters. The observations (made each half hour) are performed with a <a href="/instruments-and-observation-techniques/spectrophotometers/the-brewer-spectrophotometers" target="_blank">Brewer spectrophotometer</a> at RMI. The actual values of the UV index at other sites in the country can deviate significantly from those at Uccle, mainly due to differences in the cloud cover which can attenuate the UV radiation of about 80%. <strong>The forecasted value is always for clear-sky conditions</strong>. At (heavy) cloud cover the measured values are necessary (much) lower than the forecasted ones.</p> </div> <p class="totop-pp"><a href="#">Top</a></p> </div> </div> <div class="col-md-12 visible-xs visible-sm"> <h2 class="subpage__content__read-more"> Read more </h2> <div class="box"> <nav class="sidebar-nav"> <h3 class="sidebar-nav__title"> Research </h3> <ul class="sidebar-nav__list"> <li id="subnav-54551" class="sidebar-nav__list__item sidebar-nav__list__item--sublist"> <a href="/research-themes/ozone"> Ozone </a> <ul class="sidebar-nav__list__item__sublist"> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/introduction">Ozone in the atmosphere</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/the-ozone-hole">The ozone hole</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/measuringozone">Measuring ozone</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/instrumental-research">Ozone measurements at Uccle</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/longtermtrendsuccle">Long-term ozone trends at Uccle</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/ozone/50-years-of-ozone-measurements-at-uccle">50 years of ozonesonde measurements at Uccle</a> </li> </ul> </li> <li id="subnav-55711" class="sidebar-nav__list__item sidebar-nav__list__item--active sidebar-nav__list__item--open sidebar-nav__list__item--sublist"> <a href="/research-themes/uv"> Ultraviolet (UV) radiation </a> <ul class="sidebar-nav__list__item__sublist"> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/uv/what-is-the-uv-index">What is the UV index?</a> </li> <li class="sidebar-nav__list__item__sublist__item sidebar-nav__list__item__sublist__item--active"> <a href="/research-themes/uv/todays-uv-index-at-uccle">Today's UV index at Uccle</a> </li> </ul> </li> <li id="subnav-54471" class="sidebar-nav__list__item sidebar-nav__list__item--sublist"> <a href="/research-themes/aerosols"> Aerosols </a> <ul class="sidebar-nav__list__item__sublist"> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/aerosols/what-are-the-effects-of-aerosols">Why investigate aerosol particles?</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/aerosols/measurements-of-atmospheric-aerosol-particles">Measurements of atmospheric aerosol particles</a> </li> </ul> </li> <li id="subnav-55741" class="sidebar-nav__list__item sidebar-nav__list__item--sublist"> <a href="/research-themes/water-vapour"> Water vapour </a> <ul class="sidebar-nav__list__item__sublist"> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/water-vapour/total-column-water-vapour">Total column water vapour</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/water-vapour/iwv-intercomparisons">IWV intercomparisons</a> </li> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/water-vapour/fog">Radiation fog</a> </li> </ul> </li> <li id="subnav-55751" class="sidebar-nav__list__item sidebar-nav__list__item--sublist"> <a href="/research-themes/atmospheric-modelling"> Atmospheric modelling </a> <ul class="sidebar-nav__list__item__sublist"> <li class="sidebar-nav__list__item__sublist__item "> <a href="/research-themes/atmospheric-modelling/biogenic-modelling">Airborne allergenic pollen modelling</a> </li> </ul> </li> <li id="subnav-57391" class="sidebar-nav__list__item "> <a href="/research-themes/atmospheric-profiling"> Atmospheric profiling </a> </li> </ul> </nav> </div> </div> </div> </div> </main> </div> </div> <div class="totop-wrapper"> <div class="container"> <button class="totop-btn js-totop"> <i class="totop-btn__icon 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