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Tropical Storm Elsa Forecast Discussion Number 34
2021-07-08 16:58:42| National Hurricane Center (Atlantic)
Issued at 1100 AM EDT Thu Jul 08 2021 000 WTNT45 KNHC 081458 TCDAT5 Tropical Storm Elsa Discussion Number 34 NWS National Hurricane Center Miami FL AL052021 1100 AM EDT Thu Jul 08 2021 Surface synoptic observations and high-resolution satellite images indicate that the center of the storm has moved into North Carolina. WSR 88-D Doppler radar data and surface reports indicate that the maximum winds are near 40 kt. These highest winds are likely occurring in some of the stronger convective bands near the coast. Elsa is gradually accelerating toward the northeast, and the initial motion is about 040/17 kt. A faster northeastward motion is expected over the next couple of days as the cyclone becomes entrained into the mid-latitude southwesterly flow ahead of a broad mid-tropospheric trough over the eastern United States and Canada. Elsa should move near or over southeastern New England and Atlantic Canada during the next 24-48 hours. The official track forecast is basically an update of the previous one and continues to follow the multi-model consensus. Some slight intensification is possible within the next 24-36 hours due to baroclinic forcing from a mid-latitude short wave trough. Around 36 hours, the simulated satellite imagery from the global models depicts a cloud pattern resembling that of a frontal cyclone. Moreover, the FSU phase analyses of the GFS fields shows the system becoming extratropical at that time. This is also reflected in the official forecast. Key Messages: 1. As Elsa moves across North Carolina and Virginia today, heavy rainfall may result in limited flash and urban flooding. Heavy rainfall from the Mid-Atlantic into New England through Friday could lead to considerable flash and urban flooding. 2. Tropical storm conditions are expected along portions of the North Carolina coast today and the mid-Atlantic coast by this afternoon or tonight. Tropical storm conditions are expected in portions of the southern New England states and New York by Friday. Gusty winds are expected over portions of Atlantic Canada Friday night and Saturday. FORECAST POSITIONS AND MAX WINDS INIT 08/1500Z 35.0N 79.7W 40 KT 45 MPH 12H 09/0000Z 37.3N 77.0W 40 KT 45 MPH...INLAND 24H 09/1200Z 40.6N 72.5W 45 KT 50 MPH...OVER WATER 36H 10/0000Z 44.5N 67.0W 45 KT 50 MPH...POST-TROP/EXTRATROP 48H 10/1200Z 49.0N 59.0W 45 KT 50 MPH...POST-TROP/EXTRATROP 60H 11/0000Z 53.5N 50.0W 40 KT 45 MPH...POST-TROP/EXTRATROP 72H 11/1200Z 59.0N 40.0W 35 KT 40 MPH...POST-TROP/EXTRATROP 96H 12/1200Z...DISSIPATED $$ Forecaster Pasch
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