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| #1109464 (Received by flhurricane at: 10:59 AM 28.Sep.2022) TCDAT4 Hurricane Ian Discussion Number 24 NWS National Hurricane Center Miami FL AL092022 1100 AM EDT Wed Sep 28 2022 Air Force Reserve and NOAA Hurricane Hunter data was absolutely critical this morning in diagnosing the rapid intensification of Ian, despite both planes undergoing multiple eyewall penetrations experiencing severe turbulence. That data supported an intensity of about 135 kt a few hours ago. Since that time, high-resolution Tampa Doppler radar data has been sampling the eyewall near 10,000 ft with winds up to 155 kt, indicating that Ian is on the threshold of category 5 status. The maximum winds are set to 135 kt on this advisory. Ian is expected to make landfall in southwestern Florida in the next few hours as a catastrophic hurricane. No changes were made to the track forecast near Florida, except to be faster to come into line with the latest consensus aids. One important change is that Ian is likely to remain more intact as it crosses the Florida peninsula (due to both its stronger initial wind speed and its faster forecast forward speed), and this now increases the threat of hurricane-force winds on the east coast of Florida. This necessitates the issuance of a Hurricane Warning on the east coast of central Florida. While significant re-strengthening of Ian might not occur over the Atlantic Ocean, model guidance has been catching up with a trough interaction from a shortwave over the southern United States, and are stronger than yesterday on Ian's intensity with more baroclinic forcing. Thus, a Hurricane Watch has been issued from northeastern Florida northward up the coast through most of coastal South Carolina. The new intensity forecast is raised from the previous one, near the latest statistical-dynamical guidance. Key Messages: 1. Catastrophic storm surge inundation of 12 to 18 feet above ground level along with destructive waves are expected somewhere along the southwest Florida coastline from Englewood to Bonita Beach, including Charlotte Harbor. Residents in these areas should urgently follow any evacuation orders in effect. 2. Catastrophic wind damage is beginning along the southwestern coast of Florida today near the landfall location. Hurricane-force winds are expected to extend well inland along near the core of Ian. Preparations to protect life and property should be urgently rushed to completion. 3. Heavy rainfall will spread across the Florida peninsula through Thursday and reach portions of the Southeast U.S. later this week and this weekend. Widespread, life-threatening catastrophic flooding is expected across portions of central Florida with considerable flooding in southern Florida, northern Florida, southeastern Georgia and coastal South Carolina. Widespread, prolonged major and record river flooding is expected across central Florida. 4. Hurricane conditions are expected along the east-central Florida coast overnight, where a Hurricane Warning has been issued. Hurricane conditions are possible from northeastern Florida to portions of South Carolina on Thursday and Friday, and a Hurricane Watch has been issued for that area. FORECAST POSITIONS AND MAX WINDS INIT 28/1500Z 26.3N 82.5W 135 KT 155 MPH 12H 29/0000Z 27.3N 82.1W 105 KT 120 MPH...INLAND 24H 29/1200Z 28.3N 81.4W 60 KT 70 MPH...INLAND 36H 30/0000Z 29.3N 80.8W 55 KT 65 MPH...OVER WATER 48H 30/1200Z 30.8N 80.6W 55 KT 65 MPH...OVER WATER 60H 01/0000Z 32.9N 80.9W 45 KT 50 MPH...INLAND 72H 01/1200Z 34.7N 81.5W 30 KT 35 MPH...POST-TROP/EXTRATROP 96H 02/1200Z 36.0N 81.5W 20 KT 25 MPH...POST-TROP/EXTRATROP 120H 03/1200Z...DISSIPATED $$ Forecaster Blake |
