By 8:35 am, the temperature had jumped to 86 degrees, 12 degrees warmer in 20 minutes! Parts of the Omaha metro experienced a rare 'heat burst'. When a thunderstorm begins to die, the rain starts to evaporate midair. Most heat bursts can rapidly warm the air by 20-50 degrees, but there are extreme examples. While the heat burst experienced Wednesday morning in Omaha was nowhere close to that, it still brought quite uncomfortable conditions at 9 am on a Wednesday.