Extended Forecast Discussion NWS Weather Prediction Center College Park MD 1200 PM EDT Sat Apr 13 2019 Valid 12Z Tue Apr 16 2019 - 12Z Sat Apr 20 2019 ...Yet another major spring storm mid-late next week will pack an excessive rainfall and severe weather threat for the central to eastern U.S... ...Overview... Potent upper level troughing will push through the West early week and dive through the Plains and over the Midwest mid-later week as ridging comes back to both coasts temporarily in an amplifying pattern. This supports a robust storm to lift from the southern Plains to the Great Lakes that holds a threat of excessive rain, strong winds/severe weather and some Upper Midwest/Great Lakes snows. ...Guidance Preferences and Weather Highlights/Threats... Models and ensembles exhibit considerable mid-smaller scale system variance from run to run, but overall offers reasonably similar larger scale pattern evolution and amplification next week. A favored day 3-7 composite blend of the latest GFS/ECMWF mixed with some GEFS/ECMWF ensemble mean guidance heralds a dynamic energy track through the unsettled West that leads to yet another significant storm genesis and weather threat for especially the central and into the eastern U.S. Significant precipitation will again increase into Wednesday and spread Thursday/Friday from the Mississippi/Missouri Valleys through the East with frontal progression as low pressure strengthens over the Plains and Midwest. Multi-inch rainfall totals/flooding are probable (enhanced in embedded convection) in some locations of the warm sector and to the north/northeast of the low with additional northern stream support. SPC has issued a day 4-6 severe weather risk. Temperatures to the north/northwest of the low may only be marginally cold enough for snow. 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