Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 307 PM EDT Sat Jun 20 2015 Valid 00Z Sun Jun 21 2015 - 00Z Tue Jun 23 2015 ...Severe weather and flash flooding possible for the Mid-Atlantic and Central Appalachians due to remnants of Bill... ...Stormy weather will continue through the northern and central Plains into the Middle Mississippi Valley/Midwest... As Bill transitions into a post-tropical cyclone, it will still carry an impressive amount of moisture and convection while swiftly moving to the east. Showers and thunderstorms are already breaking out across the Southeast and Mid-Atlantic ahead of the center of Bill. Meanwhile, a warm front will continue to lift north into the Northeast. This will bring a moist, unstable environment to the Mid-Atlantic and central Appalachians and make ripe conditions for both severe weather and flash flooding on Saturday night and into Sunday morning. The bulk of precipitation associated with Bill will pass through the Mid-Atlantic on Saturday night and quickly moves into the Northeast by Sunday afternoon. Once the low moves over water by Sunday evening, it will take northeastward track toward the Canadian maritimes and bring showers and thunderstorms over coastal New England. Looking to the west, a cold front is pushing eastward through the central Plains and Middle Mississippi Valley. Ahead of it, organized showers and thunderstorms will continue to move into the Middle Mississippi Valley and Mid-West through Saturday morning. By Sunday, scattered showers and thunderstorms are expected along the front as it moves through the Ohio Valley and Northeast. By Monday morning, another frontal boundary will drop into the northern and central Plains once again, bringing another round of convection. Elsewhere, Texas and Oklahoma will continue to see showers and thunderstorms through Sunday evening. By Monday morning, most of the precipitation will be confined to Big Bend region. Florida can also expect its typical diurnal-driven thunderstorms through the short term period. Fanning Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php