Issued at 1100 AM AST Wed Sep 17 2025
000 WTNT42 KNHC 171458 TCDAT2 Tropical Storm Gabrielle Discussion Number 2 NWS National Hurricane Center Miami FL AL072025 Issued by the NWS Weather Prediction Center College Park MD 1100 AM AST Wed Sep 17 2025 Satellite imagery this morning indicates that the large system is not well-organized, with an elongated circulation oriented from north-northwest to south-southeast containing a few embedded swirls. The advisory center is a mean center of those swirls, with any associated convection well east of the position due to southwesterly shear. While it wouldn't appear so from conventional satellite data, a recent scatterometer pass indicates upwards of 40-kt winds present, generally northeast and southeast of the center of circulation. Although the system is at best marginally well defined, there is enough data to support an initial intensity of 40 kt, and the depression is named Gabrielle. Little strengthening is anticipated over the next 48 hours as Gabrielle faces an unfavorable shear environment from an upper-level trough and a possible center re-formation, and the forecast intensity remains nearly steady through Friday. By this weekend, a more conducive environment is anticipated, which should allow for gradual intensification. Gabrielle is forecast to become a hurricane by 96 hours. The NHC intensity forecast remains fairly similar to the previous forecast cycle, but it should be noted that there remains considerable spread in the solutions and overall forecast intensity confidence is low. Gabrielle is well away from land and about midway between the Cabo Verde Islands and the Windward Islands. The current estimated motion is north-northwestward, but this is highly uncertain as the center could be re-forming to the north. The system is forecast to move northwestward to west-northwestward due to the subtropical ridge for the next several days. While the forecast has been adjusted to the north from the previous one, this is almost exclusively due to the jump in the initial position. This is a highly uncertain forecast until a better defined center forms. Based on the recent trends, this system should pass well east and north of the Windward and Leeward Islands, but interests in Bermuda should monitor forecasts during the next several days. FORECAST POSITIONS AND MAX WINDS INIT 17/1500Z 17.5N 46.6W 40 KT 45 MPH 12H 18/0000Z 19.5N 48.5W 45 KT 50 MPH 24H 18/1200Z 20.8N 50.6W 45 KT 50 MPH 36H 19/0000Z 21.8N 52.6W 45 KT 50 MPH 48H 19/1200Z 22.7N 54.6W 45 KT 50 MPH 60H 20/0000Z 23.5N 56.6W 50 KT 60 MPH 72H 20/1200Z 24.7N 58.3W 55 KT 65 MPH 96H 21/1200Z 27.4N 60.8W 65 KT 75 MPH 120H 22/1200Z 30.0N 62.5W 75 KT 85 MPH $$ Forecaster Taylor/Blake
NHC Atlantic
