11:40 a.m.
Jacksonville, Florida, authorities are telling residents near the St. Johns river to leave quickly as floodwaters rise.
The Jacksonville Sheriff's Office warned people in evacuation zones A and B along the St. Johns River to "Get out NOW."
They say river is at historic flood levels and likely to get worse at high tide around 2 p.m.
On its Facebook page, the sheriff's office told those who need help evacuating to "put a white flag in front of your house. A t-shirt, anything white."
Rescue teams were ready to deploy.
Live video of flooding in downtown Jacksonville.
https://www.facebook.com/livemap/#@30.287168786,-81.621160612,10z