SternWake
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It appears evacuation routes in SE Florida are bumper to bumper.
From jeff masters wunderblog:
https://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=3468
The Hurricane Hunters just found concentric eyewalls with a diameter of 75 and 12 miles. Radar data also confirms that Matthew is likely going through an eyewall replacement cycle (ERC), where the inner eyewall will collapse and be replaced by a giant outer eyewall with a diameter of 75 miles. If the inner eyewall collapses before Matthew hits Florida, the top winds at landfall might be only Category 2 strength. The down side of an ERC is that it will spread hurricane-force winds out over a larger area, increasing the storm surge. Another issue with a large radius outer eyewall is the potential for prolonged exposure to high winds on the western edge, as the storm moves northward along the coast.
I think Matthew has very little chance of increasing its winds beyond the current advisory intensity of 140 mph.
An experimental version of the SHIPS model run at 2 pm EDT predicts predicts max winds of 111, 105, 102, and 101 kts at 6, 12, 18, and 24 hrs if ERC-weakening begins now. Without the ERC, SHIPS (with inland decay if the storm hits land) predicts 121, 119, 117, and 114 kts
From jeff masters wunderblog:
https://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=3468