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Hurricane Lorenzo Forecast Discussion Number 16
2019-09-26 16:53:44| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Thu Sep 26 2019 000 WTNT43 KNHC 261453 TCDAT3 Hurricane Lorenzo Discussion Number 16 NWS National Hurricane Center Miami FL AL132019 1100 AM AST Thu Sep 26 2019 A review of microwave satellite imagery from last night suggests that Lorenzo underwent an eyewall replacement cycle, with the outer eyewall becoming predominant around 06Z-09Z. Around that time, the hurricane started to rapidly intensify, with the eye becoming much better defined in conventional satellite imagery. Raw Data-T numbers from both subjective and objective versions of the Dvorak Technique suggest that the maximum winds have increased to near 115 kt, which will be the initial intensity for this advisory. The initial wind radii have been revised based on a recently received scatterometer overpass. The initial motion is 295/11. Lorenzo is approaching a developing break in the subtropical ridge caused by a series of mid-latitude troughs to the northwest of the hurricane, and the track guidance models are in excellent agreement that Lorenzo should recurve through the break during the forecast period. There are no significant changes to the guidance since the last advisory, and there are no significant changes to the forecast track either. Data from the SHIPS model suggest that Lorenzo will be in an area of maximum potential intensities of 125-135 kt for the next 3-4 days. This suggests that the rapid intensification should end in the next 6-12 h as the actual intensity approaches those speeds. Fluctuations in strength due to eyewall replacement cycles are expected during the 12-36 h period. The global models suggest that Lorenzo will subsequently interact with an upper-level trough during recurvature, which should cause a period of increased shear and some weakening of the cyclone around 48 h. By 120 h, the hurricane should weaken due to movement over colder water and into strong shear in the mid-latitude westerlies. While its exact ranking will be determined later, Lorenzo is one of the largest and most powerful hurricanes of record for the central tropical Atlantic, with the only comparable hurricane in recent times near there being Gabrielle of 1989. FORECAST POSITIONS AND MAX WINDS INIT 26/1500Z 15.4N 40.2W 115 KT 130 MPH 12H 27/0000Z 16.7N 41.4W 125 KT 145 MPH 24H 27/1200Z 18.5N 42.6W 125 KT 145 MPH 36H 28/0000Z 20.2N 43.5W 120 KT 140 MPH 48H 28/1200Z 21.9N 43.9W 110 KT 125 MPH 72H 29/1200Z 25.2N 43.3W 100 KT 115 MPH 96H 30/1200Z 29.0N 41.0W 100 KT 115 MPH 120H 01/1200Z 34.0N 37.0W 90 KT 105 MPH $$ Forecaster Beven
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