Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 341 AM EDT Thu Jun 06 2019 Valid 12Z Thu Jun 06 2019 - 12Z Sat Jun 08 2019 ...Multi-day heavy rain event from the southern Plains and Gulf Coast into the southern Appalachians and southern Mid-Atlantic, with flash flooding possible... ...Severe weather threats for portions of south-central Texas, the lower Mississippi valley and from the northern Great Basin into the northern Rockies on Thursday... ...Strong cold front to move through the northwestern U.S. Thursday and Friday... Deep, tropical moisture ahead of an upper level system will continue to support widespread moderate to heavy rains as it moves east across the southern Plains into the lower Mississippi valley Thursday and Friday. Heaviest rains on Thursday are expected to focus from the central Gulf Coast northward into a frontal band settling south into the lower Ohio and Tennessee valleys and the Arkansas Basin. These rains may pose flash flooding concerns, with the Weather Prediction Center highlighting this area with a Slight Risk for excessive rainfall on Thursday. In addition to heavy rains, strong to severe thunderstorms are also a concern, especially for portions of south-central Texas to the coastal plain where the Storm Prediction Center is indicating an Enhanced Risk for severe thunderstorms producing damaging winds and large hail Thursday afternoon and evening. Beginning Friday and continuing into Saturday, as the upper system continues to drift east, the heavy rain and flash flooding threat is expected to extend farther east into the southern Appalachians and southern Mid-Atlantic. Across the West, a strong cold front is forecast to push east into the northern Rockies and Great Basin on Thursday. Strong to severe storms are expected to develop ahead of the front from northern Utah into central Montana, with a Slight Risk for severe weather indicated by the Storm Prediction Center. On Friday, as the front continues to move farther east, the severe weather threat is expected to shift out into portions of eastern Montana and Wyoming and the western Dakotas. Significantly colder temperatures will follow the front, with daytime highs 10-20 degrees below average expected across portions of the Pacific Northwest on Thursday, before spreading farther east across the northern Intermountain West into the northern Rockies on Friday. By late Thursday and continuing into the weekend, a wintry mix can be expected across the higher elevations of the Pacific Northwest mountain ranges, as well as the northern Rockies. Pereira Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php