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Tropical Storm Karen Forecast Discussion Number 10
2019-09-24 16:52:32| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Tue Sep 24 2019 000 WTNT42 KNHC 241452 TCDAT2 Tropical Storm Karen Discussion Number 10 NWS National Hurricane Center Miami FL AL122019 1100 AM AST Tue Sep 24 2019 Satellite imagery and reports from an Air Force Reserve Hurricane Hunter aircraft show that there has been little change in either the structure or the intensity of Karen since the last advisory. The broad and elongated low-level center is located to the north of the strong convection, and the aircraft has reported a central pressure of 1007 mb and maximum 1500 ft flight-level winds of 35 kt south of the center. The initial intensity is held at 35 kt for this advisory. The initial motion is now 360/7. Karen is in a complex steering environment that includes a low- to mid-level ridge to the east and northeast, Tropical Storm Jerry to the north-northwest, and a large mid- to upper-level trough extending from near Jerry to eastern Cuba. These weather systems should steer Karen generally northward today, followed by a north-northeastward motion that should continue for a couple of days. This motion should bring the center of Karen near or over Puerto Rico and the Virgin Islands this afternoon, then into the open Atlantic tonight. During the 72-120 h period, the large-scale models forecast a low- to mid-level ridge to build near Karen, which will significantly slow its forward motion. The new forecast track will continue the trend of the previous forecast and the ECMWF model in showing the ridge building enough to turn Karen west-southwestward by 120 h. However, other models suggest a looping motion or little motion during the 96-120 h, and this part of the forecast track is quite uncertain. The large-scale models forecast the shear that has been affecting Karen to diminish during the next couple of days, which should allow the cyclone to gradually strengthen. From 72-120 h, the storm is expected to start entraining dry air, which could limit intensification despite the otherwise favorable shear and sea surface temperature environment. The new intensity forecast is unchanged from the previous forecast, and it lies between the weaker dynamical models and the stronger statistical-dynamical models. Key Messages: 1. Karen is expected to bring heavy rainfall, flash floods and mudslides to Puerto Rico and the U.S. and British Virgin Islands today, where a tropical storm warning is in effect. The rainfall and potential flooding will likely continue on Wednesday even as the center of Karen moves away from Puerto Rico and the Virgin Islands. FORECAST POSITIONS AND MAX WINDS INIT 24/1500Z 17.5N 65.8W 35 KT 40 MPH 12H 25/0000Z 19.1N 65.4W 35 KT 40 MPH 24H 25/1200Z 21.3N 64.9W 40 KT 45 MPH 36H 26/0000Z 23.6N 64.1W 45 KT 50 MPH 48H 26/1200Z 25.5N 63.4W 50 KT 60 MPH 72H 27/1200Z 27.8N 62.0W 55 KT 65 MPH 96H 28/1200Z 28.0N 62.5W 60 KT 70 MPH 120H 29/1200Z 27.5N 65.0W 60 KT 70 MPH $$ Forecaster Beven
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