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Tropical Storm Karen Forecast Discussion Number 12
2019-09-25 04:37:49| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Tue Sep 24 2019 000 WTNT42 KNHC 250237 TCDAT2 Tropical Storm Karen Discussion Number 12 NWS National Hurricane Center Miami FL AL122019 1100 PM AST Tue Sep 24 2019 During the afternoon and early evening hours, satellite images indicated that the cloud pattern associated with Karen was becoming a little better organized. Then, surface observations from the area just east of Puerto Rico indicated that the pressures were falling, and a center was apparently becoming better defined. The presence of this center was confirmed by a reconnaissance plane which was able to fix a tight small circulation of about 1002 or 1003 mb. This, by no means, indicates that the overall circulation of the cyclone is well organized. Winds are still swirly on the western portion of the circulation and are responding to an elongated trough of low pressure north of Puerto Rico. In fact, I would not be surprised if another center reforms father to west within the trough or the large cyclonic envelope, and the center we are tracking dissipates. In any case, preliminary analysis indicates that the center of Karen that we were tracking moved very near or over Vieques around 2100 UTC and then over Culebra a little bit later. This small center could also have been a meso-vortex within the larger circulation. Data from the reconnaissance plane and satellite intensity estimates yield an initial intensity of 40 kt. These winds are occurring primarily to the southeast of the center. Karen is heading toward a shear environment that is not ideal at all for significant intensification. As previously indicated, the NHC forecast calls for a very modest increase in intensity during the next 3 to 5 days as indicated by the HCCA model. However, some of the statistical guidance brings Karen to hurricane status by the end of the forecast period. Satellite and reconnaissance fixes indicate that Karen is moving toward the north-northeast or 015 degrees at 12 kt. This motion however, is highly uncertain because it includes the reformation of the center. The circulation of Karen is trapped between a subtropical high over the Atlantic and a mid-level trough over the Bahamas. This flow pattern will continue to steer Karen in this same generaldirection for the next 3 days. After that time, the steering flow is forecast to collapse, and Karen, if it is still a cyclone, will begin to meander. This would allow another ridge to develop north of the cyclone and force it to move westward. This is the solution provided by most of the global models. Key Messages: 1. Karen will continue to bring heavy rainfall, flash floods and mudslides to Puerto Rico, Vieques and the U.S. and British Virgin Islands into Wednesday even as the center moves away from the region. FORECAST POSITIONS AND MAX WINDS INIT 25/0300Z 19.1N 65.0W 40 KT 45 MPH 12H 25/1200Z 20.8N 64.6W 45 KT 50 MPH 24H 26/0000Z 23.2N 64.0W 45 KT 50 MPH 36H 26/1200Z 25.5N 63.4W 50 KT 60 MPH 48H 27/0000Z 27.0N 62.5W 55 KT 65 MPH 72H 28/0000Z 26.8N 61.5W 55 KT 65 MPH 96H 29/0000Z 26.5N 61.5W 55 KT 65 MPH 120H 30/0000Z 26.0N 65.5W 55 KT 65 MPH $$ Forecaster Avila
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