Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 225 AM EST Tue Nov 28 2017 Valid 12Z Tue Nov 28 2017 - 12Z Thu Nov 30 2017 ...Locally heavy rain/snow across the Olympics and Washington Cascades today... ...Very mild temperatures for the Ohio Valley... A pair of systems will push through the lower 48 through Thursday in a rather mild and dry pattern otherwise. In the Pacific Northwest, a deep surface low will move into central British Columbia and drag its attendant cold front into Washington and Oregon later today. Windy conditions with locally modest lower elevation rain and higher elevation snow (above about 2500-3000 ft) will spread east of the Cascades and into Idaho and western Montana by this afternoon. The cold front will continue to march steadily eastward into the high plains by early Wednesday with a bit cooler air in its wake. Generally lighter rain/snow is expected across Montana and that will move eastward through ND/MN late Wednesday and into the western Great Lakes by Thursday morning with snow or a mix to the north and rain to the south. Another system will approach western Washington by Thursday morning. To the east, a cold front sinking through the Plains and Four Corners region today will weaken as it moves into the lower Mississippi valley on Wednesday, but not before some moderate rain/thunderstorms break out over Oklahoma later today. The northern portion of the front will continue to move eastward off the Northeast/Mid-Atlantic coast on Wednesday but the southern portion will linger and dissipate over eastern OK/TX with only scattered light showers and a rumble of thunder. Temperatures will be quite mild ahead of the front -- 60s to near 70 degrees from Missouri northeastward to western Pennsylvania (about 15-20 degrees above average) though perhaps just short of record highs for the day. Fracasso Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php