000
WTNT44 KNHC 090250
TCDAT4
 
Hurricane Isaias Discussion Number  10
NWS National Hurricane Center Miami FL       AL092026
1000 PM CDT Thu Oct 08 2026
 
The satellite presentation of Isaias has improved over the past few 
hours. Infrared cloud top temperatures have cooled within the 
expanding central dense overcast, and recent images show a warm spot 
that could be an emerging eye. A series of earlier passive microwave 
images showed the mid-level eyewall was open to the southwest, and a 
comparison of the AMSR3 89- and 37-GHz channels indicated the vortex 
was slightly tilted with height due to continued southwesterly 
shear. The stronger Tail Doppler Radar winds noted from the previous 
mission indicated the satellite intensity estimates are likely 
running too low, and based on the improved structure of the 
hurricane, the initial intensity is raised to 90 kt. Air Force and 
NOAA Hurricane Hunter aircraft are scheduled to collect data in 
Isaias overnight.

Isaias is moving toward the northeast (040/12 kt), but is expected 
to turn northward and accelerate on Friday within the flow between 
an upper trough near the northwestern Gulf Coast and a subtropical 
ridge extending across the western Atlantic. Landfall is expected to 
occur within the hurricane warning area Friday night or early 
Saturday, with the updated 24-h forecast near the coast. The NHC 
forecast continues to lie closer to the right side of the guidance 
envelope, very near the latest corrected consensus (HCCA). This 
results in little overall change from the previous prediction, 
although this forecast is slightly faster based on the model trends 
this cycle.

High oceanic heat content and strong upper-level divergence could 
allow for additional strengthening overnight while the shear vector 
is still oriented in the direction of storm motion. A majority of 
Google DeepMind ensemble members show Isaias briefly reaching major 
hurricane status early Friday (along with some of the hurricane 
regional models), and this is now reflected in the NHC forecast. 
This strengthening should be short lived as southwesterly shear from 
the aforementioned trough will increase considerably on Friday and 
cause some weakening before landfall. Nonetheless, Isaias will be a 
dangerous hurricane with significant storm surge, damaging winds, 
and flooding rains when it reaches the northern Gulf Coast. During 
this time, the wind field is also predicted to grow due to the 
trough interaction, and some of these impacts will extend well away 
from the center. After landfall, gusty winds are expected to reach 
well inland over portions of the southeastern United States.

 
Key Messages:
 
1. A life-threatening storm surge is expected from the Mouth of the
Mississippi River to Suwannee, Florida. Residents in the warning
area should follow advice given by local officials and evacuate
immediately if told to do so.
 
2. Damaging hurricane force-winds are expected over portions of the
Florida Panhandle, southern Alabama, and southern Mississippi where
a Hurricane Warning is in effect. Residents in these areas should
prepare for the possibility of long-duration power outages.
 
3. Damaging wind gusts are possible over much of central and 
northern Alabama, extreme eastern Mississippi, and portions of 
western and northern Georgia, especially in areas of higher terrain. 
Additional Tropical Storm and High Wind Watches and Warnings may be 
required for portions of that area later tonight or on Friday. 
Residents should secure loose outdoor items, avoid driving 
high-profile vehicles, and prepare for power outages.
 
4. Isaias will bring areas of heavy rainfall to the central U.S. 
Gulf Coast and much of the Southeast Friday into the weekend. 
Considerable flash and urban flooding, along with significant river 
flooding, will be possible.
 
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  09/0300Z 25.4N  88.4W   90 KT 105 MPH
 12H  09/1200Z 27.1N  87.6W  100 KT 115 MPH
 24H  10/0000Z 29.9N  87.1W   85 KT 100 MPH
 36H  10/1200Z 32.2N  87.3W   45 KT  50 MPH...INLAND
 48H  11/0000Z 34.1N  87.5W   30 KT  35 MPH...POST-TROP/INLAND
 60H  11/1200Z 36.1N  86.1W   20 KT  25 MPH...POST-TROP/INLAND
 72H  12/0000Z 38.0N  83.0W   20 KT  25 MPH...POST-TROP/INLAND
 96H  13/0000Z...DISSIPATED
 
$$
Forecaster Reinhart