Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 234 AM EDT Fri Oct 30 2020 Valid 12Z Fri Oct 30 2020 - 12Z Sun Nov 01 2020 ...Lingering showers is expected for the northern Mid-Atlantic early Friday with light snowfall across the Interior Northeast and New England... ...A strong, but fast moving low pressure system will bring precipitation to the Pacific Northwest on Friday, gusty winds to the Northern Rockies/Plains through Saturday, and light precipiation starting as rain and mixing to snow across the Upper Great Lakes by early Sunday. ... The upper-level system that helped to rapidly accelerate Post-Tropical Cyclone Zeta off the Mid-Atlantic coast is enhancing showers currently across the Mid-Atlantic into southern New England, with some mixing of snow across upstate New York into Interior New England through morning and afternoon of Friday. Snow totals should be around 1 to 3 inches ending by late afternoon/early evening as a solid dome of high-pressure pushes in. This will help to bring unseasonably cold air across the eastern half of the US today, with much of the Midwest and Mississippi Valley running about 10-20 degrees below normal while portions of New England could be 25 degrees below average, this cold should shift slowly but hold across Texas and the Mid-Atlantic/New England for Halloween. Frost and Freeze advisories are in place across N Texas/E Oklahoma and NW Arkansas tonight and across S Pennsylvania, N Maryland, New Jersey and Delaware for tomorrow (Saturday morning). Across the western U.S., a strong low pressure system is currently tracking ashore in southwest British Columbia, leading to relatively light precipitation for parts of Washington and Oregon. Given the strength of the mid to upper level low, the surface low will rapidly deepen in southern Alberta late Friday and generate strong winds across the Northern Rockies and adjoining High Plains with a High Wind Warning in effect across northern MT with 30-40 mph winds and gust over 70 mph possible. The low will continue quickly eastward across the Canadian Prairies through Saturday, while the low will remain north, as it matures will pull enough moisture to eventually generate light precipiation across the Great Lakes late Saturday into Sunday morning, starting as rain initially, but given the strength of the low, cold air will surge behind the cold front across the Upper Midwest into the Upper Great Lakes and a change to light snow is expected. Low temps should be about 5-10 degrees below average Sunday morning but by afternoon, the cold air will drop Max temps 15-20 degrees below average across the Midwest. Gallina Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php