This is a longer update but the threats are widespread. Hurricane Helene will maintain significant strength even to Atlanta where tropical storm force winds will have a wide impact on critical infrastructure. Most people have not experienced what will unfold over the next few days. Take this storm seriously.
KEY MESSAGES:
1. Hurricane and tropical storm conditions are expected over
northeastern portions of the Yucatan Peninsula of Mexico today where
Tropical Storm and Hurricane Warnings are in effect. Tropical storm
conditions are occurring over portions of western Cuba within the
Tropical Storm Warning area, and hurricane conditions are possible
today within the Hurricane Watch area.
2. Due to the large size of Helene, there is a danger of
life-threatening storm surge along the entire west coast of the
Florida Peninsula and Florida Big Bend. The highest inundation of
greater than 10 ft is expected along the Florida Big Bend coast.
Residents in those areas should follow advice given by local
officials and evacuate if told to do so.
3. Devastating hurricane-force winds are expected across portions
of northern Florida and southern Georgia where the core of Helene
moves inland. Preparations to protect life and property should be
completed by early Thursday since tropical storm conditions are
expected to begin within these areas on Thursday. Because of
Helene’s expected fast forward speed, damaging and life-threatening
wind gusts, are expected to penetrate well inland over portions of
the southeastern United States, including in the higher terrain of
the southern Appalachians.
4. Helene will bring heavy rain to portions of the western
Caribbean with potentially significant flooding across western Cuba
and the northeastern Yucatan Peninsula into early Thursday.
Considerable and potentially life-threatening flash and urban
flooding is expected across portions of northwestern and northern
Florida, the Southeast, southern Appalachians, and the Upper
Tennessee Valley Wednesday through Friday. This includes the risk of
landslides across the southern Appalachians. Widespread minor to
moderate river flooding is likely, and isolated major river flooding
is possible.
FORECAST POSITIONS AND MAX WINDS
INIT 25/1500Z 21.6N 86.3W 70 KT 80 MPH
12H 26/0000Z 23.0N 86.4W 85 KT 100 MPH
24H 26/1200Z 25.7N 85.7W 105 KT 120 MPH
36H 27/0000Z 29.7N 84.6W 110 KT 125 MPH
48H 27/1200Z 34.3N 85.0W 50 KT 60 MPH...INLAND
60H 28/0000Z 36.6N 86.9W 30 KT 35 MPH...POST-TROP/INLAND
72H 28/1200Z 36.9N 87.8W 20 KT 25 MPH...POST-TROP/INLAND
96H 29/1200Z 36.6N 87.9W 15 KT 15 MPH...POST-TROP/INLAND
120H 30/1200Z...DISSIPATED
Негізгі бет 20240925 Hurricane Helene SISE Tropical Update
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