Extended Forecast Discussion NWS Weather Prediction Center College Park MD 252 AM EDT Wed Oct 28 2020 Valid 12Z Sat Oct 31 2020 - 12Z Wed Nov 04 2020 ...Overview and Guidance Evaluation/Preferences... A progressive yet still amplified pattern is forecast for the CONUS Sat-Wed with troughing primarily in the eastern half of the lower 48 and ridging in the West into Texas this weekend. Through the 12Z/18Z models, the latest guidance consensus offered a good starting point to the forecast with the lead trough into the East by early Mon. Thereafter, the GFS/GEFS were a bit quicker than the ECMWF ensembles and the 12Z ECMWF even slower, but the multi-day trend has been slower as well. Preferred to weight the ECMWF and especially its ensemble mean more than the GEFS mean for next Tue-Wed as the GFS appears too progressive. Canadian offered some support to the ECMWF but became too different on timing/amplitude (perhaps too flat) to include in the blend by the end of the period. ...Weather/Hazard Highlights... Troughing will carry a surface front and respectable surface low (in Canada) through the Midwest on Sunday but with generally little precipitation. Temperatures will cool post-FROPA and daytime highs will be about 5-15 degrees below normal. Rain and some high elevation snow is forecast for the Northeast and perhaps Mid-Atlantic as the front moves through the region Sunday. Some lake-enhanced precipitation cannot be ruled out either. Over Florida, the tail-end of a cold/stationary front in addition to another cold front Monday will maintain a chance of at least light rain for central and southern Florida. More significant precipitation may enter the Pacific Northwest midweek next week as a front comes ashore. Temperatures will be near to above normal in the West through the period. 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