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Hurricane Larry Forecast Discussion Number 33
2021-09-08 22:50:44| National Hurricane Center (Atlantic)
Issued at 500 PM AST Wed Sep 08 2021 741 WTNT42 KNHC 082050 TCDAT2 Hurricane Larry Discussion Number 33 NWS National Hurricane Center Miami FL AL122021 500 PM AST Wed Sep 08 2021 Larry's overall organization has shown little change on satellite images this afternoon. The eye remains rather ill-defined but the hurricane continues to produce some strong convection near/around the center. Cirrus-level outflow remains quite well defined, particularly to the northwest. The current intensity estimate is held at 95 kt, which is only slightly above the latest Dvorak estimates. Another Air Force Reserve Unit Hurricane Hunter aircraft is scheduled to investigate Larry this evening to provide a new intensity estimate. The hurricane continues heading a little faster toward the northwest, or at about 325/13 kt. The track forecast philosophy remains about the same as before. Larry should move around the western side of a deep-layer subtropical anticyclone over the central Atlantic for the next 36 to 48 hours, passing east of Bermuda tomorrow. After that, the hurricane is expected to accelerate northeastward on the east side of a deep-layer trough moving through the eastern United States, and Larry will move near or over southeastern Newfoundland in roughly 60 hours. Then, the cyclone is forecast to move over the far north Atlantic. The official forecast is close to the dynamical model consensus solution and, again, very similar to the previous NHC track. Based on the dynamical model guidance, weak to moderate vertical shear should prevail over Larry during the next couple of days. Sea surface temperatures below the cyclone begin to cool significantly after 48 hours, which should induce weakening. However, baroclinic forcing associated with the trough to the west may help the hurricane maintain some of its intensity over cooler waters, as suggested by the global models. The official intensity forecast follows the model consensus and keeps Larry at hurricane strength even after extratropical transition. In 5 days or less, the system should merge with another large cyclonic circulation over the north Atlantic. Key Messages: 1. Large swells generated by Larry will continue to affect the Leeward Islands, portions of the Greater Antilles, the Bahamas, Bermuda, and the east coast of the United States and Atlantic Canada through the end of the week. These swells will likely cause life-threatening surf and rip current conditions, and beachgoers and other interests along these coasts are urged to follow the guidance of lifeguards and local officials this week. 2. The center of Larry is forecast to pass east of Bermuda on Thursday, but given Larry's large size, tropical storm conditions are expected there there Thursday, along with a risk of coastal flooding. A Tropical Storm Warning is in effect for Bermuda, and interests there should closely monitor the latest forecast updates. 3. Larry is forecast to move near or over portions of southeastern Newfoundland late Friday and Friday night as it undergoes transition to a hurricane-force post-tropical cyclone. There is an increasing risk of impacts from high winds, rainfall, and storm surge in portions of Newfoundland, and interests there should monitor updates to the forecast. FORECAST POSITIONS AND MAX WINDS INIT 08/2100Z 28.9N 59.2W 95 KT 110 MPH 12H 09/0600Z 30.6N 60.5W 95 KT 110 MPH 24H 09/1800Z 33.3N 61.8W 95 KT 110 MPH 36H 10/0600Z 37.0N 61.5W 90 KT 105 MPH 48H 10/1800Z 42.0N 58.5W 85 KT 100 MPH 60H 11/0600Z 48.0N 52.0W 75 KT 85 MPH...POST-TROP/EXTRATROP 72H 11/1800Z 54.0N 45.0W 65 KT 75 MPH...POST-TROP/EXTRATROP 96H 12/1800Z 62.0N 37.0W 50 KT 60 MPH...POST-TROP/EXTRATROP 120H 13/1800Z...DISSIPATED $$ Forecaster Pasch
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