From Meteorologist Zack Fradella:
Although Irma weakened to a tropical storm earlier this morning, the system continues to produce widespread flash flooding in addition to storm surge flooding along the East Coast.
From Northeast Florida up the coast to Georgia and South Carolina, onshore flow is leading to a tidal surge between 3-5 feet. This is creating problems as the heavy rainfall is not being allowed to drain properly leading to multiple rivers going into flood.
Very heavy rains associated with Irma fell overnight in the Jacksonville area where an onshore flow is pushing water up the St. Johns River. This has led to a Flash Flood Emergency in downtown Jacksonville where residents are being urged to evacuate due to rising water.
As of latest check, Irma has knocked out power to as many as 6 million people with that number expected to rise as the storm continues to track north.
For those in upstate Georgia, South Carolina and Alabama, Irma is transitioning into a big rain producer with some embedded wind gusts that could cause minor damage.