How do you predict a storm?

Satellites. Satellites are critical in short-term forecasting. Satellite images can give an early indication of a developing thunderstorm by showing where cumulus clouds are forming . Cumulus clouds grow rapidly into cumulonimbus clouds if conditions are right, and you can track their growth using satellite images.

How can forecasters 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 are 3 signs that a storm is coming?

Weather Signs of an Incoming Storm Large, puffy cumulus clouds. Giant, puffy cumulus clouds are one of the most common signs of an imminent thunderstorm. ... Drastic Temperature Change. A drastic drop in temperature is another major sign of an incoming storm. ... Sudden Changes in Wind Direction. Jan 26, 2023

Which storm type is hardest to predict?

In 2022 and 2023, PERiLS researchers deployed across the southeastern United States used a fleet of instruments to capture a trove of data on squall line tornadoes.

Which state has thunderstorms?

Thunderstorms occur in all 50 states . They can occur, at any time, day or night, throughout the entire year.

Can humans 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?

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.

How can you predict how far a storm is?

If you count the number of seconds between the flash of lightning and the sound of thunder, and then divide by 5, you'll get the distance in miles to the lightning : 5 seconds = 1 mile, 15 seconds = 3 miles, 0 seconds = very close. Keep in mind that you should be in a safe place while counting.

How accurate are storm predictions?

The accuracy of weather predictions tends to decrease as the forecast period extends. The success rate for one-day forecasts is about 96-98% . It drops to about 90% for three-day forecasts. The more days in advance the forecast, the more likely it is that the weather will change.

How do storm predictors work?

Storm Glass, a nineteenth century weather-predicting instrument, is a sealed glass container with a mixture of distilled water and chemicals, which predicts weather with various precipitant formations within the glass .

How far in advance can thunderstorms be predicted?

The Short Answer: A seven-day forecast can accurately predict the weather about 80 percent of the time and a five-day forecast can accurately predict the weather approximately 90 percent of the time. However, a 10-day—or longer—forecast is only right about half the time.

Storm forecast - Your Local Thunderstorm Risk Forecast

Home
Weather Forecasts
UK Forecasts
Storm Forecasts

Check your local storm risk forecast by entering your city, town or postcode into the box below.

Today
Tomorrow
Sat 06/07
Sun 07/07
Mon 08/07
Tue 09/07
Wed 10/07
More Detail
C
F

Today
Tomorrow
Sat 06/07
Sun 07/07
Mon 08/07
Tue 09/07
Wed 10/07
More Detail

Time

Temp	Humidity	Dewpoint	Cape	Precip	Convective Cloud	Storm Risk

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

"+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,18351~18351;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;}

Local Information For London

Moon:

Sunrise:
Sunset:

London Local Deals

London Homes

London Hotels

Remove Ads?

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)

Local Information For London

Storm Forecast Info

FAQs

How do you predict a storm? ›

How far in advance can thunderstorms be predicted? ›

References