Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 239 PM EST Fri Nov 24 2017 Valid 00Z Sat Nov 25 2017 - 00Z Mon Nov 27 2017 ...Heavy rainfall possible across the Pacific Northwest and Northern California... ...Well above normal temperatures across the western and central U.S. through the weekend... The northwestern U.S. will remain wet over the weekend, as a low pressure system approaches and onshore flow strengthens, bringing plenty of moisture to the area. Rain chances are forecast to increase across the Pacific Northwest on Saturday, spreading eastward into the Northern Great Basin and southward into Northern California on Saturday night. Locally heavy rain is possible. Some snow is expected to mix in at the higher elevations, but snow accumulations are not forecast to be very high through Sunday afternoon--generally less than 6 inches in the northern Cascades. More snow is likely just after the short range forecast period, however. A cold front will sweep through the eastern U.S. over the next couple of days, with a secondary front moving through the Great Lakes and Northeast behind it. Some light rain and snow is expected for the Great Lakes, northern Mid-Atlantic, and Northeast due to these fronts. Temperature-wise, much of the continental U.S. will be warmer than average this weekend, with highs up to 20 degrees above average in the Southwest on Saturday. A few record highs are possible there. Temperatures 20 degrees above normal spread to the Rockies and Northern and Central Plains by Sunday, with more possibilities for record highs and record high minimum temperatures. The eastern U.S. will generally be 5 to 10 degrees above average on Saturday, but high temperatures are forecast to be few degrees below average on Sunday, related to the cold frontal passage. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php