Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 401 PM EDT Sat Sep 15 2018 Valid 00Z Sun Sep 16 2018 - 00Z Tue Sep 18 2018 ...Florence will continue track west than north through the Appalachian region while severe thunderstorms remain possible near coastal Carolinas... ...Catastrophic flash flooding and prolonged river flooding expected to continue over portions of the Carolinas and the Southern/Central Appalachians... ...Heavy rain and flash flooding possible for portions of South-central Texas... Tropical Storm Florence is forecast to weaken as it slowly tracks westward through South Carolina this evening, turn north through the Southern/Central Appalachians Sunday and Monday then exiting the southern New England Coast by Tuesday afternoon. Excessive amounts of rain is being spread across this region and will continue to cause significant flooding over the next few days. Please check the National Hurricane Center advisory for the latest track and intensity forecast. Scattered showers and thunderstorms can be expected across portions of the Southeast U.S. Severe thunderstorms capable of producing heavy rainfall will be possible over portions of south-central and southern Texas. The Storm Prediction Center has this region identified with a slight risk for severe weather in addition to WPC having a slight risk for excessive rainfall. A front extending from parts of the Upper Great Lakes/Upper Mississippi Valley southwestward to the Great Basin will be quasi-stationary over the next couple of days. This boundary will provide focus for showers and thunderstorms to develop over the Upper Mississippi Valley/Upper Great Lakes into parts of the Northern Plains that will lift northward into Southern Canada early next week. Upper-level energy moving onshore over Central California will track toward the Northern High Plains by Sunday morning. The energy will aid in producing rain with embedded thunderstorms over parts of the Northern Intermountain Region/Northern Rockies overnight and moving into Canada by Sunday evening. Also, weak onshore flow over the Pacific Northwest will aid in producing rain over the area through Sunday evening. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php