Storm forecast - Your Local Thunderstorm Risk Forecast - Netweather.tv (2024)

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Time
TempHumidityDewpointCapePrecipConvective
Cloud
Storm
Risk

"+df(jjx);}else{var inc=1;if (exts[row] % 3 ==0){inc=3;} to=df(hx)+"

to

"+df(hx+inc);}hx="tm"+row;document.getElementById(hx).innerHTML=to;var hidden=""; if (exts[row] <=54 && exts[row] % 3 != 0 && expanded==0){hidden="none";}hx="row"+row;$(document).find("."+hx).each(function(){this.style.display=hidden;});var temp=decodetemp(forecastdata.substr((row*linelength)+0,2));var humidity=dk64(forecastdata.substr((row*linelength)+2,2));var dewpoint=decodetemp(forecastdata.substr((row*linelength)+4,2));var cape=dk64(forecastdata.substr((row*linelength)+6,3));var prec=dk64(forecastdata.substr((row*linelength)+9,3))/100;if (prec==999.99){prec=0;}var cx=0;var cx2=0;cx3=0; if (prec>2000){prec-=2000;cx=1;}var convcloud=dk64(forecastdata.substr((row*linelength)+12,2));stormrisk=dk64(forecastdata.substr((row*linelength)+14,2));;if (rd==0 && exts[row]<54 && exts[row] % 3==0) { var row2=row+1; var row3=row+2;var temp2b=decodetemp(forecastdata.substr((row2*linelength)+0,2)); var temp3=decodetemp(forecastdata.substr((row3*linelength)+0,2)); temp=Math.max(temp,temp2b,temp3);var humid2=dk64(forecastdata.substr((row2*linelength)+2,2)); var humid3=dk64(forecastdata.substr((row3*linelength)+2,2)); humidity=Math.max(humidity,humid2,humid3);var cape2=dk64(forecastdata.substr((row2*linelength)+6,3)); var cape3=dk64(forecastdata.substr((row3*linelength)+6,3)); cape=Math.max(cape,cape2,cape3);var pc2=dk64(forecastdata.substr((row2*linelength)+9,3))/100; var pc3=dk64(forecastdata.substr((row3*linelength)+9,3))/100; if (pc2==999.99){pc2=0;} if (pc3==999.99){pc3=0;} if (pc2>2000){pc2-=2000;cx2=1;}if (pc3>2000){pc3-=2000;cx3=1;} prec+=pc2;prec+=pc3;var cc2=dk64(forecastdata.substr((row2*linelength)+12,2)); var cc3=dk64(forecastdata.substr((row3*linelength)+12,2)); convcloud=Math.max(convcloud,cc2,cc3);var st2=dk64(forecastdata.substr((row2*linelength)+14,2));var st3=dk64(forecastdata.substr((row3*linelength)+14,2));stormrisk=Math.max(stormrisk,st2,st3);}var bc=gett2mcolour(roundit(temp,0)); var tempo='

'+roundit(temp,0)+"°c

"; hx="te"+row; document.getElementById(hx).innerHTML=tempo;var hc=gethumidcolour(humidity); humidity='

'+humidity+"%

"; hx="hu"+row; document.getElementById(hx).innerHTML=humidity;var bc=gett2mcolour(roundit(dewpoint,0)); var tempo='

'+roundit(dewpoint,0)+"°c

"; hx="dp"+row; document.getElementById(hx).innerHTML=tempo;var bc=getcapecolour(roundit(cape,0));var tempo='

'+roundit(cape,0)+"j/kg

";var hx="ca"+row;document.getElementById(hx).innerHTML=tempo;prec=roundit(prec,3);//var cx=0;//if (prec>2000){prec-=2000;cx=1;}prec=roundit(prec,3); var pc=getpreccol(prec); var pw=precwords(prec);if (cx==1 && cx2==1 && cx3==1){pw="Showers";} var preco='

'+prec+"mm

"; preco+='

'+pw+"

";hx="pr"+row;document.getElementById(hx).innerHTML=preco;var cl=getcloudcol(convcloud); hx="cc"+row; var cloudcovero='

'+convcloud+"%

"; document.getElementById(hx).innerHTML=cloudcovero;var st=getriskcol(stormrisk); hx="st"+row; stormrisk='

'+stormrisk+"%

";document.getElementById(hx).innerHTML=stormrisk;if (corf=="c"){}else{ctof();} // if (expanded==1 && firstx != 1){ // for (var i=0;i < exts.length;i++) // { // if (i% 3 != 0){continue;} // toggleexpand(i,expanded);// // }if (expanded==1 && exts[0] <=54){ document.getElementById("expb").innerHTML="Hide Hourly";document.getElementById("expbb").innerHTML="Hide Hourly";}else if (exts[0]<=54){document.getElementById("expb").innerHTML="Show Hourly";document.getElementById("expbb").innerHTML="Show Hourly";}}var hmm=0;function updatenwforecast(){var rows=forecastdata.length/linelength; displayrows=rows; var cc=0;if (hmm==1) { document.location="index.cgi?action=world;loc=U,31709~31709;sess="; } for (var rowxx=0;rowxx < 24;rowxx++) { if (rowxx >= rows) { var hx="row"+rowxx; $(document).find("."+hx).each(function(){this.style.display='none';}); continue; }var hidden=""; if (exts[rowxx] <=54 && exts[rowxx] % 3 != 0){hidden="none";}updatenwforecastrow(rowxx,expanded,1);}}function roundit(value,dp) { var dpx=Math.pow(10,dp); return(Math.round(value * dpx) / dpx);}function df(inx){ inx=inx%24; if (inx==24){inx="00";} inx+=""; if (inx.length<2){inx="0"+inx;} inx+=":00"; return inx;}function convctf(inx){ if (inx==corf){return;} corf=inx; setCookie("corf",inx,999);if (inx=="c") { ftoc(); } else { ctof(); }}function doexpand(){if (54==1){return;} if (expanded==0) { expanded=1; document.getElementById("expb").innerHTML="Hide Hourly";document.getElementById("expbb").innerHTML="Hide Hourly"; setCookie("exfc",1,999);//if (andr==1 && docwidth<840){loadpagex(page,1);} } else { expanded=0; document.getElementById("expb").innerHTML="Show Hourly";document.getElementById("expbb").innerHTML="Show Hourly"; setCookie("exfc",0,999); } for (var i=0;i < exts.length;i++) { if (i% 3 != 0){continue;} toggleexpand(i,expanded); }}function toggleexpand(inx,dx){if (exts[inx]>54-3){return;}if (54==1){return;} while (inx % 3 != 0) { inx-=1; } var stx=inx; var iny=inx+1; var rowx="row"+iny; var hold=document.getElementById(rowx).style.display;if (hold == "none" || dx==1) {var h1="tm"+iny;if (document.getElementById(h1).innerHTML.indexOf("NaN")>-1){ $(document).find("."+rowx).each(function(){this.style.display='none';});}else{ $(document).find("."+rowx).each(function(){this.style.display='';});} iny+=1; rowx="row"+iny;h1="tm"+iny;if (document.getElementById(h1).innerHTML.indexOf("NaN")>-1) { $(document).find("."+rowx).each(function(){this.style.display='none';}); } else{ $(document).find("."+rowx).each(function(){this.style.display='';}); } updatenwforecastrow(stx,1,1); } else { $(document).find("."+rowx).each(function(){this.style.display='none';}); iny+=1; rowx="row"+iny; $(document).find("."+rowx).each(function(){this.style.display='none';}); updatenwforecastrow(stx,0,1); }}function submitplace(){ var hold=document.getElementById("fcnewloc").value;; var holdb=document.getElementById("ctid").value; if (holdb){hold=holdb+"~"+hold;} var url="index.cgi?action="+program+";ct="+hold+"#forecasts"; document.location=url;}function getpriority(inx){inx=inx+""; var out=0; inx=inx.replace("_nt",""); if (inx=="snow") {out=1;} else if (inx=="snowy") {out=2;} else if (inx=="flurries") {out=3;} else if (inx=="rainsnow") {out=4;} else if (inx=="icyrainsnow") {out=5;} else if (inx=="rainicy") {out=6;} else if (inx=="thunderstorm") {out=7;} else if (inx=="sunthunderstorm"){out=8;} else if (inx=="sunthund") {out=9;} else if (inx=="hail") {out=10;} else if (inx=="heavyrain") {out=11;} else if (inx=="rainwindy") {out=12;} else if (inx=="rain") {out=13;} else if (inx=="scatrain") {out=14;} else if (inx=="scshowers") {out=15;} else if (inx=="sunrain") {out=16;} else if (inx=="mscloudy") {out=17;} else if (inx=="ptcloudy") {out=18;} else if (inx=="cloudy") {out=19;} else if (inx=="windy") {out=20;} else if (inx=="hot") {out=21;} else if (inx=="clr") {out=22;} else if (inx=="dust") {out=23;} else if (inx=="smoke") {out=24;}if (out==0){out=9999;} return out;}var tcolour=new Array();function gett2mcolour(inx){ inx+=16; inx=roundit(inx/2,0);if (inx<0){inx=0;}if (inx>29){inx=29;} return tcolour[inx];}tcolour[0]="bf5ebf;";tcolour[1]="bf5ebf;";tcolour[2]="bf5ebf;";tcolour[3]="bf5ebf;";tcolour[4]="c989c9;";tcolour[5]="1ca2ff;";tcolour[6]="54b9ff;";tcolour[7]="79c7fd;";tcolour[8]="99d5ff;";tcolour[9]="00bc6a;";tcolour[10]="00bc1f;";tcolour[11]="01db25;";tcolour[12]="59ed00;";tcolour[13]="99ff33;";tcolour[14]="ccff33;";tcolour[15]="ccff00;";tcolour[16]="ffff00;";tcolour[17]="ffcc00;";tcolour[18]="ffcc33;";tcolour[19]="ff9900;";tcolour[20]="ff6600;";tcolour[21]="ff3300; color: #ffffff;";tcolour[22]="ff1800; color: #ffffff;";tcolour[23]="ff0000; color: #ffffff;";tcolour[24]="ff0000; color: #ffffff;";tcolour[25]="ff0000; color: #ffffff;";tcolour[26]="ff0000; color: #ffffff;";tcolour[27]="ff0000; color: #ffffff;";tcolour[28]="ff0000; color: #ffffff;";tcolour[29]="ff0000; color: #ffffff;";function gethumidcolour(outx){ var humcol="";if (outx <= 10) {humcol="dafffa";}else if (outx <= 20) {humcol="92dfff";}else if (outx <= 30) {humcol="9cff92";}else if (outx <= 40) {humcol="5bfe4a";}else if (outx <= 50) {humcol="cdfe4a";}else if (outx <= 60) {humcol="f0ff00";}else if (outx <= 70) {humcol="ffc600";}else if (outx <= 80) {humcol="ff9600;";}else if (outx <= 90) {humcol="ff4800; color: #ffffff;";}else if (outx <= 100) {humcol="ff0000; color: #ffffff;";}return humcol;}function getpreccol(outx){ var preccol=""; if (outx <= 0) {preccol="ffffff";}else if (outx < 1) {preccol="aefeff";}else if (outx <= 2) {preccol="56d2fb";}else if (outx <= 5) {preccol="37ef19";}else if (outx <= 10) {preccol="fcff00";}else if (outx > 10) {preccol="ff9600; color: #ffffff;";} return preccol;}function getcloudcol(inx){ var cloudout=""; if (inx < 10) {cloudout="ffffff; color: #000000;";} else if (inx < 20) {cloudout="eeeeee; color: #000000;";} else if (inx < 30) {cloudout="dddddd; color: #000000;";} else if (inx < 40) {cloudout="cccccc; color: #000000;";} else if (inx < 50) {cloudout="bbbbbb; color: #000000;";} else if (inx < 60) {cloudout="aaaaaa; color: #000000;";} else if (inx < 70) {cloudout="999999; color: #ffffff;";} else if (inx < 80) {cloudout="888888; color: #ffffff;";} else if (inx < 90) {cloudout="777777; color: #ffffff;";} else {cloudout="555555; color: #ffffff;";} return cloudout;}function getriskcol(perc){ var snrcol=""; if (perc <= 10) {snrcol="dafffa";}else if (perc <= 20) {snrcol="92dfff";}else if (perc <= 30) {snrcol="9cff92";}else if (perc <= 40) {snrcol="5bfe4a";}else if (perc <= 50) {snrcol="cdfe4a";}else if (perc <= 60) {snrcol="f0ff00";}else if (perc <= 70) {snrcol="ffc600";}else if (perc <= 80) {snrcol="ff9600; color: #ffffff;";}else if (perc <= 90) {snrcol="ff4800; color: #ffffff;";}else if (perc <= 100) {snrcol="ff0000; color: #ffffff;";} return snrcol;}function ftoc(){ $('div[name="tfc"]').each( function(){ var h=this.innerHTML; var t=h.match(/F/); if (t != "F"){return;} var numb=h; numb=h.replace(/[^0-9.-]+/g, ''); //var numb = h.match(/^-{0,1}\d+/)[0]; numb=5.0/9.0 * (numb - 32.0); this.innerHTML=roundit(numb,1)+'°c'; }); $('div[name="pfc"]').each( function(){ var h=this.innerHTML; var t=h.match(/\"/); if (t != "\""){return;} //var numb=h.match(/^-{0,1}\d*\.{0,1}\d+/)[0]; var numb=h; numb=h.replace(/[^0-9.-]+/g, ''); numb*=25.4; numb=roundit(numb,2); this.innerHTML=numb+'mm'; } );$('td[name="tfc"]').each( function(){ var h=this.innerHTML; var t=h.match(/F/); if (t != "F"){return;} var numb=h; numb=h.replace(/[^0-9.-]+/g, ''); //var numb = h.match(/^-{0,1}\d+/)[0]; numb=5.0/9.0 * (numb - 32.0); this.innerHTML=roundit(numb,1)+'°c'; }); $('td[name="pfc"]').each( function(){ var h=this.innerHTML; var t=h.match(/\"/); if (t != "\""){return;} //var numb=h.match(/^-{0,1}\d*\.{0,1}\d+/)[0]; var numb=h; numb=h.replace(/[^0-9.-]+/g, ''); numb*=25.4; numb=roundit(numb,2); this.innerHTML=numb+'mm'; } );}function ctof(){ $('div[name="tfc"]').each( function(){ var h=this.innerHTML; var t=h.match(/c/); if (t != "c"){return;} //var numb = h.match(/^-{0,1}\d+/)[0]; var numb=h; numb=h.replace(/[^0-9.-]+/g, ''); numb=9/5 * numb + 32; this.innerHTML=roundit(numb,1)+'°F'; }); $('div[name="pfc"]').each( function(){ var h=this.innerHTML; var t=h.match(/mm/) if (t != "mm"){return;} var numb=h; numb=h.replace(/[^0-9.-]+/g, ''); numb*=0.0393700787; numb=roundit(numb,3); this.innerHTML=numb+'"'; }); $('td[name="tfc"]').each( function(){ var h=this.innerHTML; var t=h.match(/c/); if (t != "c"){return;} //var numb = h.match(/^-{0,1}\d+/)[0]; var numb=h; numb=h.replace(/[^0-9.-]+/g, ''); numb=9/5 * numb + 32; this.innerHTML=roundit(numb,1)+'°F'; }); $('td[name="pfc"]').each( function(){ var h=this.innerHTML; var t=h.match(/mm/) if (t != "mm"){return;} var numb=h; numb=h.replace(/[^0-9.-]+/g, ''); numb*=0.0393700787; numb=roundit(numb,3); this.innerHTML=numb+'"'; });}function precwords(outx,coutx){ var outs=""; //if (outx<0.15){outx=0;} if (outx == 0) {outs="None";}else if ( outx < 2 && outx >= 0.15) {outs="Showers";} // else if (outx < 1) {outs="V Light";} // else if (outx >= 1 && outx < 2) {outs="Light";} else if (outx >= 2 && outx < 5) {outs="Moderate";} else if (outx >= 5 && outx < 10){outs="Heavy";} else if (outx >= 10) {outs="Torrential";}else if ( outx < 2 && outx >= 0.15) {outs="Showers";} return outs;}function setCookie(c_name,value,expiredays){ var exdate=new Date(); exdate.setDate(exdate.getDate()+expiredays); document.cookie=c_name+ "=" +escape(value)+ ((expiredays==null) ? "" : ";expires="+exdate.toGMTString())+"; path=/";}function getCookie(c_name){ if (document.cookie.length>0) { c_start=document.cookie.indexOf(c_name + "="); if (c_start!=-1) { c_start=c_start + c_name.length+1; c_end=document.cookie.indexOf(";",c_start); if (c_end==-1) c_end=document.cookie.length; return unescape(document.cookie.substring(c_start,c_end)); } } return "";}function getcapecolour(capex){ var capecolour="ffffff"; if (capex <= 0) {capecolour="dafffa";}else if (capex <= 100) {capecolour="99d5ff";}else if (capex <= 150) {capecolour="00bc1f";}else if (capex <= 200) {capecolour="59ed00";}else if (capex <= 300) {capecolour="ccff33";}else if (capex <= 400) {capecolour="ffff00";}else if (capex <= 500) {capecolour="ffcc00";}else if (capex <= 750) {capecolour="ffcc33";}else if (capex <= 1000) {capecolour="ff9900";}else if (capex <= 1250) {capecolour="ff6600";}else if (capex <= 1500) {capecolour="ff3300";}else if (capex <= 1750) {capecolour="ff1800";}else {capecolour="ff0000";}return capecolour;}function getliftcolour(liftx){ var liftcolour="ffffff"; if (liftx >= 10) {liftcolour="dafffa";}else if (liftx >= 5) {liftcolour="54b9ff";}else if (liftx >= 0) {liftcolour="00bc1f";}else if (liftx >= -2) {liftcolour="ffff00";}else if (liftx >= -4) {liftcolour="ff9900";}else if (liftx >= -6) {liftcolour="ff3300";}else if (liftx >= -8) {liftcolour="ff1800";}else {liftcolour="ff0000";} return liftcolour;}

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Storm Forecast Info

You may not be familiar with a couple of the items within the storm forecast, the first one CAPE is a measure of the available energy in the atmosphere for convection (storms and showers), just because this level is high though, it doesn't guarantee that conditions will be right for storms. CAPE is an abbreviation of Convective Available Potential Energy and is measured in joules per kilogram.

Another term is Lifted Index, this is a measure of the buouyancy in the air. Negative numbers mean the air is buoyant so will rise, positive numbers inicate sinking air. The more buoyant the air is, the better chance there is that the CAPE can be tapped in to.

Storm forecast - Your Local Thunderstorm Risk Forecast - Netweather.tv (2024)

FAQs

How long does a storm last? ›

Classification. A strict meteorological definition of a terrestrial storm is a wind measuring 10 or higher on the Beaufort scale, meaning a wind speed of 24.5 m/s (89 km/h, 55 mph) or more; however, popular usage is not so restrictive. Storms can last anywhere from 12 to 200 hours, depending on season and geography.

Can we predict thunderstorms? ›

Satellites take pictures of Earth at regular intervals from space, telling us where clouds are located. Meteorologists watch these pictures over time to watch for rapidly growing clouds, a clue to a possible thunderstorm.

What types of data are used to forecast and monitor severe weather events? ›

The National Weather Service uses a combination of radar, satellite, lightning detection, and surface observations, including volunteer spotter reports for detecting and tracking severe weather.

How do meteorologists predict when a storm is coming? ›

This is done by examining a large quantity of observation data including surface observations, satellite imagery, radar data, radiosonde data, upper-air data, wind profilers, aircraft observations, river gauges, and simply looking outside.

How bad will storms be in 2050? ›

Intense hurricanes and typhoons – the most devastating storms on the planet – could more than double by 2050 in nearly all regions of the world because of climate change, scientists reported Wednesday.

How long after a storm is it safe to shower? ›

To protect yourself from a lightning strike, refrain from showering for at least 30 minutes after the last thunder roll you hear. “The most dangerous times for a lightning strike are immediately before and immediately after the storm,” says Dr. Bazzoli.

Is it OK to be out in a thunderstorm? ›

Remember, NO PLACE outside is safe when thunderstorms are in the area. If you are caught outside in a thunderstorm, keep moving toward a safe shelter. Myth: Metal structures or metal on the body (jewelry, watches, etc.) attract lightning.

Can people sense thunderstorms? ›

Depending on how far it is, the thunderstorm will somewhat change the air around a region so a human being can feel it, but it's not gonna be long distances. You could feel a thunderstorm happening sometime within a few miles more or less, but nothing major.

What is the most famous thunderstorm in history? ›

The Great Thunderstorm of Widecombe-in-the-Moor in Dartmoor, Kingdom of England, took place on Sunday, 21 October 1638, when the church of St Pancras was apparently struck by ball lightning during a severe thunderstorm.

Are twisters tornadoes? ›

A tornado is forming. Also known as twisters, tornadoes are violently spinning, funnel-shaped columns of air that stretch from the dark thunderclouds they form in all the way to the ground.

What is the US severe weather database? ›

The Severe Weather Data Inventory (SWDI) is an integrated database of U.S. severe weather records that provides access to data from a variety of sources in the NCEI archive. SWDI includes multiple search and access methods for records that cover particular time periods and geographic regions.

What are the 4 types of weather data? ›

They are heat energy, air pressure, winds, and moisture. Changes in these factors determine the kind of weather an area will have. We base decisions on what to wear, where to go, and what to do on the weather forecast.

What are the three things that can make a thunderstorm severe? ›

A thunderstorm is classified as “severe” when it contains one or more of the following: hail one inch or greater, winds gusting in excess of 50 knots (57.5 mph), or a tornado.

What are the three basic ingredients needed to make a thunderstorm? ›

There are three basic ingredients needed for thunderstorm development: moisture, an unstable atmosphere, and some way to start the atmosphere moving. Moisture is necessary to produce the thunderstorm clouds and precipitation.

Why is it so hard to predict thunderstorms? ›

“There are fundamental limits to how well you can do it because the atmosphere is chaotic,” said Tapio Schneider, a professor at Caltech. “Chaotic means that what happens later is sensitively dependent on the initial condition, on the state right now.

How long do strong storms last? ›

Individual cells usually last 30 to 60 minutes, while the system as a whole may last for many hours. Multicell storms may produce hail, strong winds, brief tornadoes, and/or flooding. A squall line is a group of storms arranged in a line, often accompanied by “squalls” of high wind and heavy rain.

What is the average length of a storm? ›

The typical thunderstorm is 15 miles in diameter and lasts an average of 30 minutes. Nearly 1,800 thunderstorms are occurring at any moment around the world. That's 16 million a year!

How long does it take for a storm to pass? ›

Thunderstorms typically do not last very long and will most often pass by your location in less than one hour. The best defense against thunderstorms is to stay inside a sturdy, substantial building that can protect you from lightning, hail, damaging wind, heavy rain, and tornadoes.

What is the longest time a storm has lasted? ›

Major records
CharacteristicRecord
Longest lasting tropical cyclone36 days
Longest distance traveled by tropical cyclone13,180 km (8,190 mi)
Longest lasting Category 4 or 5 winds8.25 consecutive days
Longest lasting Category 5 winds5.50 consecutive days
32 more rows

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