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Tropical Storm Elsa Forecast Discussion Number 32
2021-07-08 04:59:35| National Hurricane Center (Atlantic)
Issued at 1100 PM EDT Wed Jul 07 2021 000 WTNT45 KNHC 080259 TCDAT5 Tropical Storm Elsa Discussion Number 32 NWS National Hurricane Center Miami FL AL052021 1100 PM EDT Wed Jul 07 2021 Doppler radar and surface observations indicate that Elsa is maintaining its intensity. However, these winds aren't close to the center but, rather, in a strong band of convection in the eastern semicircle of the storm. The current wind speed is set to 40 kt in accordance with an earlier sustained wind report of 38 kt, and radar velocities reduced to the surface that would support at least 40 kt. Some weakening is expected overnight while a significant portion of Elsa's circulation remains over land. However by late Thursday, more of the storm will be moving over water, and a fair number of the models suggest re-intensification could take place. It is a little puzzling why the ECMWF and UKMET models, however, are showing a strengthening tropical storm close to the mid-Atlantic states, especially without a significant trough interaction or warm waters. I'm getting some deja vu in this case after working Claudette from a few weeks ago, with those same models also over-intensifying that storm. The GFS has been relatively consistent in showing only a small intensification of Elsa, and the NHC forecast will continue to be closer to that model's relatively weaker solution. The storm has turned north-northeastward tonight and is moving a little faster, about 14 kt. Elsa should move northeastward at an increasing forward speed during the next few days as it becomes embedded within fast southwesterly flow ahead of a mid-latitude trough. No significant changes were made to the previous track forecast since guidance remains in good agreement. Elsa is likely to become absorbed north of Newfoundland by another extratropical low by day 4. There is greater confidence tonight that some portion of North Carolina and the mid-Atlantic coast will receive tropical-storm force-winds, so the Tropical Storm Watch has been upgraded to a Tropical Storm Warning in those areas. Areas to the north remain less certain, and remain under a Tropical Storm Watch. Key Messages: 1. As Elsa moves across southeastern Georgia into the Lowcountry of South Carolina tonight, heavy rainfall may result in considerable flash, urban, and minor river flooding. Heavy rainfall, from North Carolina across the mid-Atlantic and into New England Thursday and Friday, could lead to isolated flash and urban flooding. 2. Tropical storm conditions are expected along portions of the coasts of Georgia and South Carolina tonight. Tropical storm conditions are also expected along the coasts of North Carolina on Thursday and the mid-Atlantic by Thursday night. Tropical storm conditions are possible in the southern New England states and New York by Friday. FORECAST POSITIONS AND MAX WINDS INIT 08/0300Z 32.1N 82.3W 40 KT 45 MPH...INLAND 12H 08/1200Z 34.1N 80.7W 35 KT 40 MPH...INLAND 24H 09/0000Z 37.1N 77.3W 35 KT 40 MPH...INLAND 36H 09/1200Z 40.4N 72.9W 40 KT 45 MPH...OVER WATER 48H 10/0000Z 44.5N 67.0W 40 KT 45 MPH...POST-TROP/EXTRATROP 60H 10/1200Z 49.0N 60.0W 40 KT 45 MPH...POST-TROP/EXTRATROP 72H 11/0000Z 54.0N 50.0W 35 KT 40 MPH...POST-TROP/EXTRATROP 96H 12/0000Z...DISSIPATED $$ Forecaster Blake
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