Extended Forecast Discussion NWS Weather Prediction Center College Park MD 109 AM EDT Fri Aug 07 2020 Valid 12Z Mon Aug 10 2020 - 12Z Fri Aug 14 2020 ...Overview and Guidance/Predictability Assessment... Guidance reasonably agrees that two closed upper lows will track eastward over Canada as trough energies and moderating/convection focusing fronts work over the northern half of the U.S.. Underneath, hot upper ridging will prevail over the southern half of our nation. The WPC medium range product suite was mainly derived from a composite of well clustered guidance from the GFS/ECMWF/UKMET/Canadian days 3-5/Mon-Wed in a pattern with above normal predictability. Forecast spread growth and flow continuity favors a transition into day 7/Fri to the ECMWF ensemble mean along with continued usage of the National Blend of Models. ...Weather/Hazard Highlights... Episodes of strong to severe thunderstorms are likely from the n-central U.S. to the East. The most prominent focus for convection will be with a cold front working into above normal lead heat from the Midwest to the Northeast/Mid-Atlantic Mon-Wed. The stalling front trailing back through the north-central states will remain a convective focus next week as impulses eject from a moderating upper trough set to dig into the Northwest. Meanwhile, the Southeast/Florida will see diurnal convection of varying intensity, with a weakening front over the Southeast providing an added focus early in the period. Within the broad area of shower/thunderstorm potential there will likely be areas of heavy rainfall. Schichtel Additional 3-7 Day Hazards information can be found on the WPC medium range hazards chart at: https://www.wpc.ncep.noaa.gov/threats/threats.php WPC medium range 500mb heights, surface systems, weather grids, quantitative precipitation, winter weather outlook probabilities and heat indices are at: https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4 https://www.wpc.ncep.noaa.gov/heat_index.shtml