Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 426 AM EDT Sun Jul 03 2016 Valid 12Z Sun Jul 03 2016 - 12Z Tue Jul 05 2016 ...Flash flooding and severe weather threat over the Middle Mississippi Valley will shift eastward into the Ohio Valley and Central Appalachians... ...Warm and muggy conditions will persist from the southern Plains to the Carolinas... ...Cooling trend expected from the Northwest to the northern Rockies early this week... Shower and thunderstorm activity will continue to focus near a frontal boundary stretched from the central Plains to the Mid-Atlantic coast. The main threat for any flash flooding and severe weather should be ahead of a wave of low pressure along the boundary...which will track across the Middle Mississippi Valley on Sunday before lifting through the Ohio Valley and towards the central Appalachians on Monday. To the south of the boundary...warm and muggy conditions will persist from the southern Plains to the Carolinas...while an additional few days of dry and pleasant weather are expected well north of the boundary across the Northeast. A cooling trend is in store from the Northwest to the northern Rockies early this week as a series of cold fronts gradually press inland over the northwestern corner of the Nation. Showers and thunderstorms will be possible ahead of the boundaries...especially as they push out into the northern Plains...but any heavy rainfall totals should be localized. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php