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Potential Tropical Cyclone Three Graphics
2021-06-19 01:40:20| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Fri, 18 Jun 2021 23:40:20 GMT Wind Speed Probabilities last updated Fri, 18 Jun 2021 21:22:36 GMT
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Summary for Potential Tropical Cyclone Three (AT3/AL032021)
2021-06-19 01:39:34| National Hurricane Center (Atlantic)
...DISTURBANCE APPROACHING THE NORTH-CENTRAL GULF COAST... ...HEAVY RAINFALL AND TROPICAL-STORM-FORCE WINDS CONTINUING TO SPREAD ACROSS THE REGION... As of 7:00 PM CDT Fri Jun 18 the center of Three was located near 28.3, -91.1 with movement N at 16 mph. The minimum central pressure was 1007 mb with maximum sustained winds of about 45 mph.
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Potential Tropical Cyclone Three Public Advisory Number 5A
2021-06-19 01:39:34| National Hurricane Center (Atlantic)
Issued at 700 PM CDT Fri Jun 18 2021 000 WTNT33 KNHC 182339 TCPAT3 BULLETIN Potential Tropical Cyclone Three Intermediate Advisory Number 5A NWS National Hurricane Center Miami FL AL032021 700 PM CDT Fri Jun 18 2021 ...DISTURBANCE APPROACHING THE NORTH-CENTRAL GULF COAST... ...HEAVY RAINFALL AND TROPICAL-STORM-FORCE WINDS CONTINUING TO SPREAD ACROSS THE REGION... SUMMARY OF 700 PM CDT...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...28.3N 91.1W ABOUT 100 MI...160 KM S OF MORGAN CITY LOUISIANA ABOUT 260 MI...420 KM SW OF MOBILE ALABAMA MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H PRESENT MOVEMENT...N OR 5 DEGREES AT 16 MPH...26 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 700 PM CDT (0000 UTC), the disturbance was centered near latitude 28.3 North, longitude 91.1 West. The system is moving toward the north near 16 mph (26 km/h) and a north to north-northeast motion is expected during the next day or so. On the forecast track, the system will make landfall along the north-central Gulf Coast tonight or early Saturday. A northeastward or east-northeastward motion across the southeastern United States is forecast after landfall through the weekend. Maximum sustained winds are near 45 mph (75 km/h) with higher gusts. Satellite images and surface observations indicate that the circulation is slowly becoming better defined, and the system still is likely to become a tropical or subtropical storm before landfall. Regardless of its status, little change in strength is expected through landfall. Weakening is forecast to begin after the system crosses the coast. * Formation chance through 48 hours...high ...90 percent. * Formation chance through 5 days...high...90 percent. Tropical-storm-force winds extend outward up to 205 miles (335 km) mainly to the east of the center. An oil rig south of the southeastern coast of Louisiana recently reported sustained winds of 44 mph (70 km/h) and a wind gust of 58 mph (93 km/h). The estimated minimum central pressure based on surface observations and Air Force Hurricane Hunter data 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 4 to 8 inches with isolated maximum amounts of 12 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 southeastern Mississippi, southern and central Alabama, central to northern Georgia, far western North Carolina and western South Carolina, resulting in rainfall totals of 3 to 5 inches with isolated maximum amounts of 7 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 are beginning to reach the coast within the warning area, and these winds will continue into Saturday. TORNADOES: There is a threat for a tornado or two tonight across coastal Louisiana. A few tornadoes are possible on Saturday across southern portions of Louisiana, Mississippi, Alabama, and the western Florida Panhandle. NEXT ADVISORY ------------- Next complete advisory at 1000 PM CDT. $$ Forecaster Beven
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Potential Tropical Cyclone Three Graphics
2021-06-18 22:34:46| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Fri, 18 Jun 2021 20:34:46 GMT Wind Speed Probabilities last updated Fri, 18 Jun 2021 21:22:36 GMT
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Potential Tropical Cyclone Three Forecast Discussion Number 5
2021-06-18 22:34:00| National Hurricane Center (Atlantic)
Issued at 400 PM CDT Fri Jun 18 2021 000 WTNT43 KNHC 182033 TCDAT3 Potential Tropical Cyclone Three Discussion Number 5 NWS National Hurricane Center Miami FL AL032021 400 PM CDT Fri Jun 18 2021 A few hours ago, an ASCAT-A pass indicated that maximum winds were about 40 kt well east of the ill-defined center of circulation, and the initial wind speed was increased to that value at the intermediate advisory at 18Z. Recent surface observations just offshore of southeastern Louisiana have been reporting maximum winds between 30 and 40 kt. Based on a combination of these data, and since the structure of the system has not changed much during the past few hours, the initial intensity is held at 40 kt for this advisory. Although the disturbance has wind speeds of tropical storm intensity, it has not been named a tropical storm yet since its center is ill defined and broad as evident in the Air Force Hurricane Hunter data and surface observations. Regardless of its status, heavy rains and tropical-storm-force winds are spreading across portions of the northern Gulf coast, and these conditions will spread inland through tonight. There has not been much change to the track forecast reasoning. The cyclone is moving northward at about 14 kt, and a general north to north-northeast motion is expected through landfall, which is likely to occur overnight or early Saturday morning. After the system moves inland, a turn to the northeast and then east-northeast across the southeast U.S. is predicted when the cyclone becomes embedded in the westerlies on the north side of the subtropical ridge. The models remain in relatively good agreement, and only small changes were made to the previous track forecast. There is some opportunity for a little strengthening during the next 6 to 12 hours before the system makes landfall. However, significant intensification is not expected due to the cyclone's broad and asymmetric structure, and ongoing west-southwesterly vertical wind shear. After landfall, weakening is forecast, and dissipation is still predicted to occur by 72 hours. However, it should be noted that the ECMWF and UKMET models hold onto the vortex for a while longer. Given the current and anticipated structure of this system, users should not focus on the exact track of the center, as rainfall and wind hazards are likely to extend well east of the center. Key Messages: 1. The system is expected to produce heavy rainfall and considerable flash, urban and small stream flooding tonight and through the weekend along the Central Gulf coast. Flood impacts will spread northeastward into the Southern Appalachians. 2. Tropical storm conditions have begun along portions of the central Gulf Coast from east of Morgan City, Louisiana, to the Okaloosa/Walton County line, Florida, including New Orleans. These winds will spread inland and continue into Saturday. FORECAST POSITIONS AND MAX WINDS INIT 18/2100Z 27.9N 91.2W 40 KT 45 MPH...POTENTIAL TROP CYCLONE 12H 19/0600Z 29.5N 90.8W 40 KT 45 MPH...INLAND 24H 19/1800Z 31.4N 89.4W 35 KT 40 MPH...INLAND 36H 20/0600Z 32.8N 87.4W 30 KT 35 MPH...INLAND 48H 20/1800Z 33.8N 84.9W 25 KT 30 MPH...INLAND 60H 21/0600Z 34.7N 81.9W 20 KT 25 MPH...POST-TROP/REMNT LOW 72H 21/1800Z...DISSIPATED $$ Forecaster Cangialosi
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