Public Tropical Cyclone Advisory
817 WTNT34 KNHC 081754 TCPAT4 BULLETIN Hurricane Isaias Intermediate Advisory Number 8A NWS National Hurricane Center Miami FL AL092026 100 PM CDT Thu Oct 08 2026 ...ISAIAS EXPECTED TO STRENGTHEN FURTHER... ...PREPARATIONS TO PROTECT LIFE AND PROPERTY FROM STORM SURGE AND DAMAGING WINDS IN THE WARNING AREA SHOULD BE RUSHED TO COMPLETION TODAY... SUMMARY OF 100 PM CDT...1800 UTC...INFORMATION ---------------------------------------------- LOCATION...24.0N 89.8W ABOUT 185 MI...300 KM N OF PROGRESO MEXICO ABOUT 355 MI...570 KM S OF THE MOUTH OF THE MISSISSIPPI RIVER MAXIMUM SUSTAINED WINDS...85 MPH...140 KM/H PRESENT MOVEMENT...ENE OR 60 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...975 MB...28.80 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Mouth of the Mississippi River to the Suwannee River A Hurricane Warning is in effect for... * Ocean Springs, MS to the Bay/Gulf County Line, FL A Tropical Storm Warning is in effect for... * Jefferson/Plaquemines Parish Line, LA to west of Ocean Springs, MS * East of Bay/Gulf County Line to Aucilla River, FL A Storm Surge Watch is in effect for... * Suwannee River to Yankeetown A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, during the next 36 hours in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. This is a life-threatening situation. Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions. Promptly follow evacuation and other instructions from local officials. A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. A warning is typically issued 36 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. Preparations to protect life and property should be rushed to completion. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Storm Surge Watch means there is a possibility of life- threatening inundation, from rising water moving inland from the coastline, in the indicated locations during the next 48 hours. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 100 PM CDT (1800 UTC), the center of Hurricane Isaias was located near latitude 24.0 North, longitude 89.8 West. Isaias is moving toward the east-northeast near 10 mph (17 km/h). A turn toward the northeast is expected later today followed by a northward turn on Friday. On the forecast track, Isaias is expected to pass to the north of the Yucatan Peninsula today and make landfall along the U.S. northern Gulf Coast within the warning area late Friday or early Saturday. Maximum sustained winds are near 85 mph (140 km/h) with higher gusts. Additional strengthening is expected through early Friday, and Isaias should remain a dangerous hurricane as it approaches the northern Gulf Coast Friday night. Hurricane-force winds extend outward up to 15 miles (30 km) from the center and tropical-storm-force winds extend outward up to 90 miles (150 km). The estimated minimum central pressure is 975 mb (28.80 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Isaias can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC. STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide... Ocean Springs, MS to Indian Pass, FL...5-7 ft Mobile Bay...5-7 ft Indian Pass, FL to Steinhatchee River, FL...4-6 ft Mouth of the Mississippi River, LA to Ocean Springs, MS...3-5 ft Steinhatchee River, FL to Suwannee River, FL...3-5 ft Suwannee River, FL to Yankeetown, FL...2-4 ft The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large and dangerous waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. For a complete depiction of areas at risk of storm surge inundation, please see the National Weather Service Peak Storm Surge Graphic, available at hurricanes.gov/graphics_at4.shtml?peakSurge. WIND: Hurricane conditions are expected within the Hurricane Warning area Friday night into early Saturday, with tropical storm conditions beginning on Friday. Tropical storm conditions are expected in the warning areas on Friday and Friday night. Gusty winds are possible in portions of the Yucatan Peninsula today. RAINFALL: Isaias is expected to produce rainfall amounts of 1 to 3 inches through Thursday across coastal portions of the eastern Bay of Campeche with isolated higher amounts possible in the states of Campeche and western Yucatan. From Friday through the weekend, Isaias is expected to produce rainfall amounts of 3 to 7 inches across the central U.S. Gulf Coast extending from far southeastern Louisiana to the Florida Big Bend region. Localized totals up to 15 inches are possible, particularly within banding across the Florida Panhandle and Big Bend. Rainfall amounts of 1 to 3 inches, with localized amounts up to 5 inches, are possible across much of the Southeast as far north as the Tennessee Valley and the Carolinas. Flash and urban flooding is possible across the region, with considerable impacts possible across much of southern Alabama and the Florida Panhandle into southwestern Georgia. River flooding is also expected, some of which could be significant. For a complete depiction of forecast rainfall associated with Tropical Storm Isaias, please see the National Weather Service Storm Total Rainfall Graphic available at hurricanes.gov/graphics_at4.shtml?rainqpf and the Flash Flood Risk graphic at hurricanes.gov/graphics_at4.shtml?ero. TORNADOES: Isolated tornadoes will be possible Friday night in coastal areas of Alabama and the Florida Panhandle and far southwestern Georgia. The tornado threat will continue Saturday for eastern Alabama, Georgia and northern Florida. SURF: Swells will affect the western and northern portions of the Yucatan Peninsula beginning today and spread northward toward the Gulf Coast on Friday. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. A depiction of rip current risk for the United States can be found at: hurricanes.gov/graphics_at4.shtml?ripCurrents NEXT ADVISORY ------------- Next complete advisory at 400 PM CDT.