TODAY 8a: Severe storms and extreme holiday heat. Avoiding concert ticket scams. Summer strength training. TODAY’s best sellers: Amazon’s summer fun in the sun.

<p>Severe weather impacting millions of Americans across the country. Also, Vicky Nguyen breaks down everything you need to know to avoid getting scammed. Plus, fitness contributor Stephanie Mansour shares some great upper body strength training exercises. And, Shop All Day contributor Chassie Post shares some best-selling items perfect for some fun in the sun.</p>