Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 300 PM EST Tue Nov 28 2017 Valid 00Z Wed Nov 29 2017 - 00Z Fri Dec 01 2017 ...Locally heavy rain/snow moving from the Pacific Northwest into the northern Rockies tonight... ...Seasonably warm weather continues across the northern Plains... A deep surface low moving into British Columbia this afternoon will drag its attendant cold front across the Pacific Northwest tonight and into the Rockies and High Plains on Wednesday. Heavy mountain snows and moderate lower elevation rainfall across the Pacific Northwest will continue into tonight while spreading into the northern Intermountain West and northern Rockies. The Pacific Northwest should see a brief break on Wednesday before more rain and snowfall moves in ahead of a system approaching the coast on Thursday. The front will make its way into the northern Plains by later Wednesday and the Ohio Valley Thursday and with very little moisture left to work with, expect mainly light rain/snow to spread across the northern tier and into the Upper Great Lakes/Midwest and eventually the eastern U.S.. Ahead of the front though, temperatures across the northern Plains will continue to be seasonably warm, with afternoon highs expected to be as much as 15 to 25 degrees above normal for this time of the year. To the east, a cold front pushing through the Midwest and Southern Plains will weaken as it approaches the lower Mississippi Valley on Wednesday. Some moderate to locally heavy rainfall/thunderstorms may be possible across Oklahoma tonight near the low center itself, but mainly light rain and isolated thunderstorms are likely Wednesday across the lower Mississippi Valley and into the Ohio Valley. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php