TCPAT3 BULLETIN Potential Tropical Cyclone Three Advisory Number 6 NWS National Hurricane Center Miami FL AL032021 1000 PM CDT Fri Jun 18 2021 ...DISTURBANCE HAS NOT YET DEVELOPED INTO A TROPICAL CYCLONE... ...HEAVY RAINFALL AND TROPICAL-STORM-FORCE WINDS CONTINUING TO SPREAD ACROSS THE NORTHERN GULF COAST REGION... SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...28.9N 90.9W ABOUT 60 MI...95 KM SSE OF MORGAN CITY LOUISIANA ABOUT 210 MI...335 KM SW OF MOBILE ALABAMA MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H PRESENT MOVEMENT...N OR 10 DEGREES AT 13 MPH...20 KM/H MINIMUM CENTRAL PRESSURE...1007 MB...29.74 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * East of Morgan City, Louisiana to the Okaloosa/Walton County line Florida. * Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within the next 6-12 hours. Interests elsewhere along the northern Gulf Coast should monitor the progress of this system. 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 1000 PM CDT (0300 UTC), the disturbance was centered near latitude 28.9 North, longitude 90.9 West. The system is moving toward the north near 13 mph (20 km/h). A turn toward the north-northeast is expected later tonight, with a turn toward the east-northeast expected by Saturday night or Sunday. On the forecast track, the system should moved inland over Louisiana during the next several hours, then move across portions of the Gulf coast and southeastern states through the weekend. Maximum sustained winds are near 45 mph (75 km/h) with higher gusts. There is still a high chance the system will become a tropical or subtropical storm through Saturday morning while the center is over or near water. The system is expected to begin weakening Saturday afternoon as it moves farther inland. * Formation chance through 48 hours...high...80 percent. * Formation chance through 5 days...high...80 percent. Tropical-storm-force winds extend outward up to 205 miles (335 km) mainly to the east of the center. Several oil rigs of off the coast of southeastern Louisiana have recently reported sustained winds of 40-45 mph (65-70 km/h). The estimated minimum central pressure is 1007 mb (29.74 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Potential Tropical Cyclone Three can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT3, WMO header WTNT43 KNHC, and on the web at www.hurricanes.gov/graphics_at3.shtml?key_messages. RAINFALL: The potential tropical cyclone is expected to produce rainfall totals of 5 to 10 inches with isolated maximum amounts of 15 inches across portions of the Central Gulf Coast. Considerable flash, urban and small stream flooding impacts as well as new and renewed minor to isolated moderate river flooding are likely. As the system continues to lift northeast through the weekend, heavy rain will expand across the interior Southeast and western Carolinas, resulting in rainfall totals of 3 to 6 inches with isolated maximum amounts of 8 inches. Flash, urban, small stream and isolated minor river flooding impacts are possible. STORM SURGE: The combination of 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... Morgan City, LA to Okaloosa/Walton County Line, FL...2-3 ft Lake Borgne and Mobile Bay...2-3 ft Lake Pontchartrain and Lake Maurepas...1-2 ft Okaloosa/Walton County Line, FL to Panama City, FL...1-2 ft Pensacola Bay, Choctawhatchee Bay, and Saint Andrew Bay...1-2 ft Cameron, LA to Morgan City, LA...1-2 ft Vermilion Bay...1-2 ft 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. WIND: Tropical storm conditions should continue along the coast in the warning area through Saturday. TORNADOES: A few tornadoes are possible through Saturday across southeast Louisiana, southern Mississippi, southern Alabama, and the western Florida Panhandle into southwest Georgia.