Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 222 PM EDT Sat Jun 02 2018 Valid 00Z Sun Jun 03 2018 - 00Z Tue Jun 05 2018 ...Severe weather threat moves into the south central Mississippi Valley today... ...A wet weekend ahead for the Mid-Atlantic with heavy rainfall and flash flooding possible... ...Warm overnight temperatures could break records for many locations from the southern Plains to the Northeast... Showers and thunderstorms will fire across the central U.S. as a cold front tracks through the Mississippi Valley and progress into the Ohio and Tennessee Valleys. The Storm Prediction Center has a slight risk for severe storms to develop over portions of the Mid- and Lower Mississippi Valley, along with another area along the Georgia and Florida border, through Sunday morning. The primary threat will be large hail and damaging winds, but isolated tornadoes and flash flooding cannot be ruled out. As the front moves through the Appalachians and the eastern states, the risk for strong to severe storms decreases to a marginal through Monday. Heavy rain and flash flooding will likely occur over the northern Mid-Atlantic this weekend. Tropical moisture streaming northward into the region will interact with a stalled surface low and frontal boundary to produce widespread convection. Much of this region is already saturated from recent heavy rain, and given that additional rounds of rain is forecast, flooding and flash flooding will be a concern. WPC has a moderate risk for excessive rainfall in effect through Sunday morning for much of the Del-Mar-Va region. Flood watches are currently in effect from Virginia to southern New Jersey. A vast portion of the Southwest and the Southern/Central Plains will continue to have a heat wave as a strong ridge remains anchored over the region. Afternoon high temperatures will be generally 5 to 10 degrees above normal for most locations, except across parts of the southern Plains where values in the upper 90s to low 100s are possible, which could approach or exceed records for a few places. The bigger story with this warmth however will be the very warm overnight temperatures, with widespread lows in the 70s expected from the southern Plains to the middle Mississippi Valley and also parts of the Eastern states. These kinds of temperatures could break overnight high minimum records for dozens of locations. Campbell/Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php