Irma Continues to Weaken as the Center Moves Along the Northwestern Coast of the Florida Peninsula

September 11, 2017 4am Advisory

Hurricane Irma:

  • Location: 28.9 N   82.6 W
  • About 35 mi ESE of Cedar Key, FL
  • About 60 mi N of Tampa, FL
  • Maximum Sustained Winds: 75 mph
  • Present Movement: NNW or 340 degrees at 18 mph
  • Minimum Central Pressure: 965 mb / 28.50 inches of mercury

At 4:00 AM CDT, the center of Hurricane Irma was located near latitude 28.9 North, longitude 82.6 West. Irma is moving toward the north-northwest near 18 mph and this motion is expected to continue through Tuesday.  On the forecast track, the center of Irma will move near the northwestern coast of the Florida Peninsula this morning, cross the eastern Florida Panhandle into southern Georgia this afternoon, and move through southwestern Georgia and eastern Alabama tonight and Tuesday.

Maximum sustained winds have decreased to near 75 mph with higher gusts.  Additional weakening is forecast, and Irma is expected to weaken to a tropical storm this morning and to a tropical depression by Tuesday afternoon.

Irma has a very large wind field.  Hurricane-force winds extend outward up to 60 miles mainly to the west of the center, and tropical-storm-force winds extend outward up to 415 miles.The Mayport Naval Station near Jacksonville, Florida, recently reported sustained winds of 68 mph and a wind gust of 87 mph.

The estimated minimum central pressure is 965 mb (28.50 inches of mercury).

 A Tropical Storm Warning is in effect for

  • West of Indian Pass to the Okaloosa/Walton County Line
  • North of Fernandina Beach to South Santee River

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