The National Hurricane Center of the United States (NHC) canceled all storm surge and tropical storm warnings that were still in effect for Isaías on Saturday, as its maximum sustained winds decreased to 55 km/h (35 mph) while moving over Alabama. The agency also announced that it will stop issuing its own updates on the system, although the threat of flooding persists.
The decision is outlined in the NHC advisory number 15, valid at 5:00 a.m. Miami time (09:00 UTC) on this October 10th. The bulletin states that there are no longer any cyclone warnings or watches in effect. However, this cancellation does not mean that the meteorological risks or the potential local alerts for rain, flooding, or tornadoes have disappeared.
At that time, the center of the post-tropical cyclone was located about 40 kilometers south-southwest of Montgomery, Alabama, and was moving north at 22 km/h, with an estimated central pressure of 1,002 millibars. The technical forecast still anticipated gusts of up to about 83 km/h, exceeding its sustained winds.
The risk of flooding continues in Florida and other states
The NHC maintains a forecast of accumulated rainfall between 100 and 200 millimeters (4 to 8 inches) during the event through the weekend in southern Alabama, the northwest of Florida—including the Panhandle and Big Bend regions—and southwestern Georgia. In some areas of Florida, especially under persistent rain bands, totals could reach around 380 millimeters (15 inches). These amounts are forecasted for the event, not newly measured rainfall records.
The risks of sudden, urban, and river flooding persist, along with possible landslides in the southern Appalachians. The bulletin also warns of the potential for tornadoes during the morning and afternoon on Saturday in parts of the eastern Panhandle of Florida, Georgia, and the Carolinas. The official weather discussion indicates that heavy rains may spread into the Tennessee Valley and the southern Appalachians.
The dangerous surf continues in the west of Cuba
Although the warnings for storm surge and tropical storm have been lifted, the NHC warns that the swell generated by Isaías will continue to affect the Gulf coasts of the United States and Mexico, as well as the western part of Cuba, throughout the weekend. The waves may create dangerous bathing conditions and rip currents that could put lives at risk. The bulletin does not issue tropical storm or storm surge warnings for Cuba.
On the Florida Gulf Coast, water levels associated with the storm surge will continue to drop throughout Saturday, according to the forecast.
The Weather Prediction Center (WPC) will take over the following bulletins starting at 11:00 a.m. Miami time (15:00 UTC). The remnants of Isaias will continue moving toward the valleys of Tennessee and Ohio, while the system weakens and could dissipate by Sunday.
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