Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 350 PM EDT Sun Jun 09 2024 Valid 00Z Mon Jun 10 2024 - 00Z Wed Jun 12 2024 ...Thunderstorms to be most active across the High Plains into portions of the Lower Mississippi Valley into parts of the Southeast... ...Hot weather to begin returning to parts of the West early this week... The same cold front that was associated with severe thunderstorms and areas of flash flooding from eastern Colorado into southern Missouri on Saturday will continue to slowly move south through Monday night before stalling near the Gulf Coast. Low level convergence near the front and a region of anomalous moisture extending from the Southeast into the southern Plains and northward into the northern High Plains will help support numerous showers and thunderstorms over the next couple of days. A few of the storms will be capable of becoming severe and/or producing flash flooding as highlighted by Marginal and Slight Risks of severe thunderstorms and Excessive Rainfall generated by the Storm Prediction Center and Weather Prediction Center. Temperatures will be pleasantly cool north of the front, with high temperature departures expected to be 10-20 degrees below average across the southern High Plains and Great Lakes region on Monday. Temperatures will moderate on Tuesday but remain below average from Texas/Oklahoma into the middle Mississippi Valley, Northeast and Mid-Atlantic region. Cloud cover from scattered showers and embedded thunderstorms will help to keep temperatures down for parts of the Great Lakes and Northeast today, but a drier trend is likely through Tuesday for these areas. An upper level trough across the western U.S. will be preceded by a weak cold front at the surface which will move eastward through Tuesday. Severe thunderstorms will be possible from eastern Wyoming into adjacent portions of South Dakota and western Nebraska on Monday as the cold front moves into the Great Plains. The cold front will not make much southern progress across the western U.S. however, and a shift toward zonal flow in the mid-levels of the atmosphere will be accompanied by warming temperatures through mid-week for the West. High temperatures are expected to reach dangerously hot levels for portions of the Sacramento and San Joaquin Valley in California as well as southern Nevada into southern Arizona. Excessive Heat Watches have been posted for these regions in anticipation of the expanding heat early this week with forecast departures ranging from 10 to 20 degrees above average on Tuesday. Otto Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php