Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 PM EDT Fri Jun 22 2018 Valid 00Z Sat Jun 23 2018 - 00Z Mon Jun 25 2018 ...Severe thunderstorm potential will be greatest across portions of the central and southern Plains throughout the weekend... ...Flash flooding concerns will lessen across the East beginning Saturday while they remain across portions of the Plains and lower Mississippi valley... ...Abundant heat in store for California and the Desert Southwest while fire weather concerns loom over the Four Corners region... A long-standing frontal boundary extending from the Mid-Atlantic region into the southern Plains will be a significant factor in the weather across much of the lower 48 through the upcoming weekend. The front will separate hot and humid conditions to the south from cooler than average to average temperatures to its north. Flash flood potential will linger across northern Indiana, central Ohio into eastern Virginia through late tonight. This region is out ahead of an upper level disturbance over the Ohio valley with scattered showers and thunderstorms forecast to spread east-northeastward into the northeast for Saturday, but with a reduced flash flood and severe thunderstorm risk. The greater potential for severe storms...via the Storm Prediction Center...will be across the southern and central High Plains this evening, and into northern Texas/eastern Oklahoma and the Ozarks for Saturday, out ahead of an upper level disturbance. It is here across the Plains and South that a better combination of wind shear and instability will be present to help support severe weather potential. Yet another upper level wave will move into the central Plains on Sunday possibly helping set the stage for another round of severe storms. Any severe storms that develop will have the possibility of producing torrential downpours with flash flooding, focused generally from eastern Colorado and Kansas into the lower Mississippi valley over the weekend. Across the West, upper level ridging will keep the region hot and dry with no rain in the forecast. Excessive Heat Warnings and Heat Advisories are in effect from the Sacramento/San Joaquin valley of California into the Desert Southwest, while Red Flag Warnings in the vicinity of the Four Corners will keep the focus on increased threats of wildfires given the added factor of gusty winds. Otto Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php