National Weather Service forecasters have now added a sudden severe storm threat to Missouri for Monday, but there's some good news that will happen as a result of that. Missouri is under a heat advisory right now through tonight according to the National Weather Service in St. Louis. Infographic, NWS St. Louis Missouri Infographic, NWS St. Louis MissouriNote that if storms do develop over the northern half of Missouri, they're expected to be scattered and isolated. After the storms potentially impact northeastern Missouri, there will be at least one more day of heat. All we need to do is tolerate some potential severe weather late Monday night before we get some relief from the heat.