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Hurricane Lorenzo Forecast Discussion Number 19
2019-09-27 10:58:56| National Hurricane Center (Atlantic)
Issued at 500 AM AST Fri Sep 27 2019 000 WTNT43 KNHC 270858 TCDAT3 Hurricane Lorenzo Discussion Number 19 NWS National Hurricane Center Miami FL AL132019 500 AM AST Fri Sep 27 2019 Lorenzo has maintained its impressive structure in satellite imagery this morning. The hurricane still has a fairly clear eye surrounded by very cold cloud tops. A 0423 UTC AMSR2 overpass showed a small break in the deepest convection in the southwest eyewall of the hurricane, but given how cloud tops have cooled since then, I suspect that did not last long. Satellite intensity estimates have not changed substantially since the last advisory, so the initial intensity remains 125 kt. The hurricane is moving steadily north-northwestward at 12 kt. The track guidance is in remarkably good agreement on Lorenzo's track and confidence in the forecast is high. Lorenzo should turn northward and then northeastward during the next few days as it moves around the western edge of a mid-level ridge centered over the eastern Atlantic. By the end of the forecast period, Lorenzo will likely accelerate northeastward ahead of mid-latitude trough approaching from the west. The official track forecast is basically unchanged since the last advisory and now sits right in the middle of the guidance envelope. The NHC intensity forecast is also mostly unchanged since the last advisory. Although SHIPS diagnostics suggest that moderate southwesterly shear could soon affect the cyclone, not much change in strength is anticipated for the next 24 hours since Lorenzo will be moving over slightly warmer waters and an eyewall replacement cycle does not seem imminent. Gradual weakening is then anticipated through early next week due to a modest increase in shear and a decrease in available ocean heat content. Short-term fluctuations in intensity related to eyewall replacement cycles are also possible during that time. The NHC forecast remains on the high side of the guidance for the first 24 hours, and is close to HCCA after that. FORECAST POSITIONS AND MAX WINDS INIT 27/0900Z 18.6N 42.1W 125 KT 145 MPH 12H 27/1800Z 20.1N 42.9W 125 KT 145 MPH 24H 28/0600Z 21.8N 43.5W 120 KT 140 MPH 36H 28/1800Z 23.5N 43.8W 115 KT 130 MPH 48H 29/0600Z 25.1N 43.4W 110 KT 125 MPH 72H 30/0600Z 28.7N 41.4W 100 KT 115 MPH 96H 01/0600Z 33.3N 37.7W 95 KT 110 MPH 120H 02/0600Z 40.0N 30.5W 85 KT 100 MPH $$ Forecaster Zelinsky
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