Powerful winds caused destruction in southern Missouri and the dangerous weather system has 48 million people across the country on alert. NBC News' George Solis reports. Jennifer McCabe took the stand on Tuesday in the murder trial of Karen Read, who is charged in the death of her boyfriend, Boston police officer John O'Keefe. McCabe was a friend of O'Keefe's. NBC News' Emilie Ikeda reports. President Trump marked the first 100 days of his second term at a rally in Michigan, a critical swing state that he won. It comes after the president called Amazon's founder to express his dissatisfaction with a report that the online retailer was considering displaying price increases because of tariffs on imported goods. Meanwhile, Trump voters in Michigan have mixed views of his first 100 days. NBC News' Peter Alexander reports. A White House official says the change is designed to avoid companies paying auto import fees to have to pay other auto related tariffs as well. NBC News' Brian Cheung reports on the confusion being created for an entire industry. New data shows 663 confirmed measles cases in Texas since late January. In an exclusive interview with NBC News, a CDC official says the outbreak is not contained and it is the biggest outbreak the agency has seen in the last 25 years. NBC News' Stephanie Gosk has more. Nationwide, people are trying to buy food with their SNAP benefits and learning the money on their cards has been stolen. NBC News' Vicky Nguyen reports NBC stations across the country have spoken with victims whose accounts have been drained. Police identified the driver that ran her vehicle into an after-school center in Illinois as 44-year-old Marianne Akers. The investigation is ongoing and she is not in police custody. NBC News' Maggie Vespa reports three elementary school students and an 18-year-old high school senior were killed in the crash. In Carlsbad, California visitors find 55-acres of stunning flowers in full bloom. The beauty lasts about 10 weeks each spring, where the magical array of colors have come alive in a tradition spanning more than 60 years. NBC News' Camila Bernal takes us there. 

The U.S. Chamber of Commerce asked the Trump administration to provide relief for small businesses facing new challenges from tariffs. Large corporations are also reporting the impact they are seeing. Apple CEO Tim Cook says current tariffs will add $900 million to the company's costs. NBC News' Christine Romans reports. John Elway's longtime friend and agent Jeff Sperbeck died after falling off a golf cart at a private residential community. Officials have not said who was driving or what caused the accident. NBC News' Liz Kreutz reports a source familiar with the details confirmed to NBC's Denver affiliate, KUSA, that Elway was the driver. President Trump announced he will remove Mike Waltz as national security advisor and will nominate him to be ambassador to the United Nations. Secretary of State Marco Rubio will take over as interim national security advisor. NBC News' Garrett Haake reports. Police in South Carolina arrested Justin Collin Adams after a manhunt that lasted several hours. Police say Adams plowed his car into several people, including two children, outside a school. NBC News' Aaron Gilchrist reports. On Block Island in New England, a team from Mystic Aquarium is racing to save entangled seals. The animals are caught in fishing gear, plastic bags and other debris. NBC News' Emilie Ikeda joins their mission on the shoreline.