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Tropical Storm Elsa Forecast Discussion Number 22
2021-07-05 22:47:47| National Hurricane Center (Atlantic)
Issued at 500 PM EDT Mon Jul 05 2021 339 WTNT45 KNHC 052047 TCDAT5 Tropical Storm Elsa Discussion Number 22 NWS National Hurricane Center Miami FL AL052021 500 PM EDT Mon Jul 05 2021 Satellite and radar imagery along with surface synoptic observations indicate that the tropical cyclone moved inland over west-central Cuba around 1800 UTC, accompanied by very heavy rains. Assuming that some weakening has occurred due to the influence of land, the advisory intensity is set to 45 kt. An Air Force Hurricane Hunter aircraft is scheduled to investigate Elsa this evening after the center moves into the Florida Straits and will provide a better assessment of the system's intensity. The storm appears to be continuing on its northwestward track and the initial motion estimate is 315/12 kt. There are no changes to the track forecast reasoning from the previous advisory. Elsa should move between the western portion of a mid-level subtropical ridge extending westward from the Atlantic and a broad low pressure area near the northwestern Gulf of Mexico coast for the next couple of days. Later in the forecast period, the system is likely to accelerate northeastward and move from the eastern United States to near Atlantic Canada. The NHC track forecast over the eastern Gulf of Mexico is practically identical to the one from the previous advisory, and a little to the left of the previous one over the eastern United States and the Atlantic. This is in good agreement with the now tightly-clustered track model guidance. Some restrengthening of the cyclone is likely after it moves into the Gulf of Mexico, but vertical shear associated with a broad upper-level trough over the Gulf is likely to limit intensification. The official intensity forecast is slightly above the latest model consensus, IVCN. Around 96 hours, the global models suggest that the cyclone will merge with a frontal zone, so the forecast shows extratropical transition at that time. Key Messages: 1. Heavy rain will impact the Cayman Islands and Cuba through tonight resulting in significant flooding and mudslides over Cuba. As Elsa approaches the Florida Keys, Florida Peninsula, and southeast Georgia through Wednesday, heavy rainfall may result in isolated flash, urban, and minor river flooding, with considerable flooding possible in southwest and western portions of Florida. Mid- to late-week, heavy rains across coastal South Carolina, North Carolina, and southeastern Virginia may result in isolated flash and urban flooding. 2. There is a danger of life-threatening storm surge along portions of the west coast of Florida Tuesday night and Wednesday, and a Storm Surge Warning has been issued for that area. 3. Tropical storm conditions are expected to continue across portions of central and western Cuba tonight, and spread northward across portions of the Florida Keys and the Florida west coast through Wednesday, where a Tropical Storm Warning is in effect. 4. There is a risk of tropical storm conditions along portions of the coasts of Georgia and the Carolinas Wednesday and Thursday. FORECAST POSITIONS AND MAX WINDS INIT 05/2100Z 22.7N 81.9W 45 KT 50 MPH 12H 06/0600Z 24.1N 82.7W 50 KT 60 MPH 24H 06/1800Z 26.1N 83.4W 55 KT 65 MPH 36H 07/0600Z 28.2N 83.6W 55 KT 65 MPH 48H 07/1800Z 30.6N 83.0W 35 KT 40 MPH...INLAND 60H 08/0600Z 32.8N 81.4W 30 KT 35 MPH...INLAND 72H 08/1800Z 35.5N 78.5W 30 KT 35 MPH...INLAND 96H 09/1800Z 41.5N 69.5W 40 KT 45 MPH...POST-TROP/EXTRATROP 120H 10/1800Z 49.0N 56.0W 40 KT 45 MPH...POST-TROP/EXTRATROP $$ Forecaster Pasch
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