Melissa is moving at a sluggish pace and could dump a lot of rain in one place. Jamaica and Haiti are likely to see the most.

Rain doesn’t bounce and snow doesn’t bounce. But hail and sleet bounce when they hit the ground. Hail can be round or spikey and, as we know, can be as small as peas or as large as a softball. Sleet is like Dippin’ Dots, because they’re small but not quite 100% spherical.

The Fujiwhara effect is rarely seen in the Atlantic Ocean, and though it's still not a sure thing, Tropical Storm Humberto's forecasts are already being impacted by a nearby tropical wave.

Jamaica and other parts of the Caribbean are staring down what could become a catastrophic, days-long assault of extreme rainfall and damaging winds with a strengthening Tropical Storm Melissa expected to become a major hurricane over some of the hottest ocean water on the planet.