Extended Forecast Discussion NWS Weather Prediction Center College Park MD 144 AM EST Mon Nov 02 2020 Valid 12Z Thu Nov 05 2020 - 12Z Mon Nov 09 2020 ...Tropical Storm Eta to track slowly through the Caribbean... ...Heavy rain is possible over southern Florida... ...Heavy precipitation for the Pacific Northwest and wintry weather through the West/Rockies/Northern Plains... ...Overview... The large-scale upper pattern in the medium range starts with generally zonal flow over much of the lower 48 with several embedded progressive shortwaves. The pattern is expected to become more amplified later week as a potent trough digs into the West, moving slowly eastward and deepening over the weekend, spreading precipitation to much of the West and west-central U.S.. Meanwhile, Tropical Storm Eta is forecast to move west across the Caribbean making landfall in Central America. It remains to be seen if energy from this system may be lifted north and east late in the week, potentially leading to additional tropical development, but regardless, a good amount of rain can be expected over parts of the Florida peninsula through next weekend as easterly flow persists north of a frontal system. ...Guidance Evaluation/Preferences... The WPC medium range product suite was primarily derived from a blend of the quite similar 12/00 UTC ECMWF and 12/00 UTC ECMWF ensemble mean. Most guidance similarly agrees to amplify the pattern over the CONUS later week, but the ECMWF and ECMWF ensemble mean depict tropical features closer to NHC than the more aggressive northward motion of recent GFS/GEFS runs. ...Weather/Hazard Highlights... The Pacific Northwest should see a wet mid-late week period given moist inflow and a series of frontal passages, especially across the Cascades and Olympics. As the potent trough (mid-level heights 2+ standard deviations below normal) moves into the West, snow levels are expected to lower late week as precipitation and cooler than normal temperatures overspread much of the Great Basin, Rockies then northern Plains by the weekend. Ahead of this cooldown, warmer than normal temperatures will spread from the western/central CONUS toward the East under a building ridge aloft. Elsewhere, heavy rainfall is possible across southern Florida as moisture interacts with easterly post-frontal flow well to the north of Eta and any possible additional tropical development. 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