Two storms, one coast. Humberto and a developing storm could tangle, with high stakes for the US East Coast

Tropical Storm Humberto is spinning in the central Atlantic, but the bigger question for the United States is what’s brewing behind it. A disturbance moving through the northern Caribbean — already drenching Puerto Rico, the Virgin Islands and Hispaniola — has a high chance of becoming the next named storm by this weekend.

​ Tropical Storm Humberto is spinning in the central Atlantic, but the bigger question for the United States is what’s brewing behind it. A disturbance moving through the northern Caribbean — already drenching Puerto Rico, the Virgin Islands and Hispaniola — has a high chance of becoming the next named storm by this weekend. Read More Breaking News, Latest News and Videos | CNN