That has led to severe erosion and left Haitians vulnerable to massive landslides when heavy rains fall.

CNN: 7.0 quake hits Haiti; 'Serious loss of life' expected

The rains are already starting to fall, and an anxious night lies ahead.

BBC: Tropical Storm Tomas: Tense evacuations in Haiti

Some states, like Georgia, may have less pollen after days of flooding rains, but the extra dampness is the perfect climate for mold, a major fall allergy, Dr. Piltch says.

CNN: Southern deluge may help fall allergy sufferers

If rains do not come in the next month or so, tens of thousands of animals could fall to thirst and poachers' bullets.

CNN: Drought endangers wildlife in African park