Extended Forecast Discussion NWS Weather Prediction Center College Park MD 212 AM EDT Fri Jul 26 2019 Valid 12Z Mon Jul 29 2019 - 12Z Fri Aug 02 2019 ...Overview and Guidance/Predictability Assessment... An upper high will meander around the Four Corners region as troughing digs into the eastern states as well as the Pacific Northwest. The models/ensembles largely agree for the first few days of the period (Mon-Wed) and a general model blend sufficed. Thereafter, the GFS became quicker than most of the ensembles with the western trough into Canada followed by the ECMWF. The 12Z Canadian may have been too deep/slow but was somewhat close in position to the ECMWF ensemble mean as the GEFS mean was out of sync a bit to its east. Trended toward a majority ECMWF ensemble mean weighting by next Fri to forge a mostly middle ground solution. ...Weather Highlights/Threats... Hot temperatures in the Southwest will abate as monsoonal moisture increases and clouds/showers/storms expand in coverage. Rainfall will focus along and ahead of the frontal boundaries from the Great Lakes and MS/OH Valley early in the week into the Northeast/Appalachia and then the Mid-Atlantic toward the middle and end of the week. Florida will see an enhanced period of rainfall with a dissipating surface boundary over the central peninsula. Fracasso 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